Barium Tungsten Electrode

Barium tungsten electrode is with characteristics of low electron work function, high electron current density, better starting performance and low temperature resistance, and is often used in the field of xenon flash lamps.

Barium tungsten electrode is with characteristics of low electron work function, high electron current density, better starting performance and low temperature resistance, and is often used in the field of xenon flash lamps. It is a kind of an electrode product that adds alkaline earth metal barium to pure tungsten electrodes. Its good physical properties and superior chemical properties is often used in the field of xenon flash lamps.

Compared with pure tungsten electrode material (tungsten content more than 99.5%), tungsten barium electrode has lower electron work function (φ=1.6 ev), higher electron current density (10A/cm2), and better startup Performance, and better low-temperature resistance, so it is often used as a photography lamp, electronic bayonet lamp, skin rejuvenation and hair removal beauty lamp, solar detector, pump light source lamp, electric pulse sterilization, industrial counting lamp, indicator light and Electrode materials in signal lights, etc.

BaW electrode can be prepared by dipping method, but this method has the disadvantages of complicated operation and difficult processing. The process to produce the electrode by dipping method is as following: 

Preparation of tungsten sponge: raw materials: 97g tungsten powder (250 mesh/cm2), 3g paraffin wax, 30-40cc aviation gasoline, glycerin; preparation process: pour gasoline into paraffin wax, melt the paraffin, and then pour the tungsten In the powder (about 180°C), stir quickly until no gasoline smell is smelled, then press into a block, and then sinter the pressed product at low temperature. The sintering temperature is 100~150°C/hour before rising to 600°C The speed is 200°C/hour at 600~1400°C, the temperature is about 1700°C during molding, and the final high temperature sintering (2000°C) is about half an hour.

Emission material: Put the barium aluminate into an oven at 100℃ for baking, then grind it into a block and put it in a molybdenum boat, add Al2O3 for sintering, when the sintering temperature reaches 700~800℃, Keep the temperature for 1 hour. When the sintering temperature is 1400°C, keep the temperature for 2 hours. After sintering into agglomerates, grind it to obtain a finished product.

Impregnated BaW electrode: Put barium aluminate into nitrocellulose and stir to form a paste, apply it to the surface of the tungsten sponge, and burn it to 1750°C until the color of the product is light green, and then sinter it. The electrode is put into a quartz container and vacuum-baked to obtain a finished product. Finally, the electrode is stored in a dry vacuum environment.

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Tungsten Alloy Weight Application – Golf Head

Tungsten alloy weight is used in golf to increase the weight of golf head. In order to improve the performance of golf clubs, the weight is added to the golf end. Compared with traditional weights (iron, lead, steel, zinc, etc.), tungsten alloy is more suitable as a weight for golf heads, because it owns the properties of greater density, stronger corrosion resistance and better impact resistance, which can effectively enhance the end product's durability.

The golf end is a part of the golf club. It has a ball hitting surface, a top and a bottom. The top is connected with a neck tube at its root end. The bottom of the ball head is provided with a receiving groove. The receiving groove is provided with a groove at the bottom. There is a first solder inside; a counterweight is arranged in the containing groove, and the specific gravity of the counterweight is greater than the specific gravity of the material at the bottom of the ball head.

The weight of the ball head is generally made of tungsten alloy. In order to facilitate disassembly and replacement, tungsten alloy counterweights are often made of screws. For beginners, not only do they have different club length requirements, but they also have different options for the weight of the head, depending on their own strength. In other words, the length of the club and the weight of the head will directly affect the direction and strength of the player when hitting the ball.

WHA weight is a high-density alloy, which has great advantages over other metals in terms of weight and volume. It can reduce the center of gravity of the club and improve the balance of the club. The density of tungsten alloy is twice that of steel, and it is also higher than lead, aluminum, and iron. It is an excellent material for weight parts. In addition, tungsten alloy is also an environmentally friendly material, which will not cause greater pollution to the ecological environment like lead, so it can better meet the development requirements of breeding parts.

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AC Contactor Tungsten Contacts

AC contactor is applied tungsten copper or tungsten iron contact as main connecting parts. AC refers to alternative current. 

Why tungsten contacts are selected for the contacts of AC contactors? Tungsten as raw material made contacts are with superior properties.

Contacts made with tungsten sheet and iron or copper leg are with properties of high temperature resistance, which can effectively avoid melting due to the increase of external temperature, so that the contact performance of the circuit can be improved.

The W contact has superior thermodynamic performance and better heat dissipation performance, which can significantly extend the single working time of the AC contactor.

Contact applied tungsten, is used purity over 99.95%, so it is with a low impurity content and a smooth surface.

AC contactors are commonly used to eliminate the arcs generated by the moving and static contacts during the opening and closing process; the working principle is to use electromagnetic force and spring elastic force to achieve the connection and breaking of the contacts, so there are two working states, namely Power-off state (release state) and energized state (action state).

In many cases, Alternative Current contactor contacts will malfunction due to overheating or burns. How does the overheating phenomenon occur?

The contactor is working in a place where the ambient temperature is too high for a long time, which will naturally increase the temperature of the contactor.

The cross-sectional area of ​​the place where the contact is poor is small, which causes the resistance in the place to be larger, and the passing current will be larger, the power loss will be higher, and the heat generated will be more, which will cause the temperature to rise. Burn the wires.

Spark discharge occurred at the contact point. Spark discharge will produce high temperature, which is mainly because the periodic decrease of current leads to frequent spark discharge at the contact point and rapid temperature rise.

After the introduction of the above content, we also have a certain understanding of why the temperature of the Alternative Current contactor will rise. Nowadays, in order to prevent the contacts from being burned, tungsten made contacts are used more widely as the contacts of AC contactors.

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Tungsten Contact Application - Switches

Tungsten contact is widely used in switches as a part to connect or disconnect the electricity. The so-called tungsten switch contact can be simply understood as the switch's contact point is made of metal tungsten, which has good heat resistance, lower resistance, good chemical stability and other advantages, and can be very good circuit connection or break, thereby reducing the probability of electrical equipment failure. Contact made of tungsten made of metal tungsten, which is often used in industry, agriculture, science and technology and national defense. Tungsten is a non-ferrous metal and also an important strategic metal. It has a silver-white appearance, metallic luster, high melting point, great hardness, low vapor pressure, and low evaporation rate. It is widely used in many fields.

The simplest switches have two pieces of metal called "contacts". When the two contacts are connected, the current can form a loop, and vice versa. It can be said that the contact point is the most important part of the switch. Therefore, the following aspects should be paid attention to when selecting raw materials for switch contacts.

When choosing contact metal, it is necessary to consider the degree of its resistance to corrosion, because most metals will form insulating oxides after being oxidized, which will make the contact not work properly. The electrical conductivity, hardness, mechanical strength, production cost, and toxic materials should be considered when selecting contact metal.

In order to improve the performance of contact points, manufacturers often electroplating corrosion-resistant metals such as metallic nickel on the contacts or use non-metallic conductive materials such as conductive plastics, which can effectively avoid adverse effects due to air oxidation.

In recent years, with the continuous development of science and technology, most of the switch contacts now use tungsten contacts. This is mainly because tungsten contacts have more excellent physical and chemical properties than traditional contact points and are not easily oxidized in air to produce an insulator.

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Tungsten Granule for Carbon Sulfur Analyzer

Tungsten granule is widely used as accelerator and catalyst in carbon sulfur analyzer to test the content of carbon and sulfur. The granular is applied pure tungsten powder with purity over 99.95% as the raw material, and sieved from the crushed tungsten bar. Therefore, the shape is irregular and mainly measured with a size range. The regular sizes we are producing are 10~20 mesh, 20~40mesh, 40~60mesh. Customized sizes are available. Besides the dimensions, as for it is used to test CS, the requirement of CS content in granule is restricted, which is C under 0.0008%, and S 0.0005%.

The CS analyzer is infrared CS analyzer, which is used to analyze the content of carbon and sulfur in chemical, steel, metallurgy, research and other industries. During testing, the samples are ferrous metals, nonferrous metals, rare earth, ores, ceramic, etc. The principle is heating the samples under high frequency induction, and testing the content of C and S through infrared absorption method. The effects of granule are as flux and accelerator.

With the flux of W granule, the testing sample can release CO2 and SO2 quickly, and granule will oxidize to tungsten trioxide under high temperature, and sublimate at 900℃, so that the C and S gas will not be covered, but with higher spread speed and oxidization.

CS analyzer can test the CS content of copper iron, alloys, stainless steel, carbon steel, cast steel, rare earth, nonferrous metals, concrete, ores, ceramic, iron ore, etc. Leco, Eltra, NCS and Hitachi are all the brands of CS analyzer, and the testing methods are infrared absorption spectrometry, electric arc and high frequency.

 

The dose of tungsten granule in CS analyzer depends on the sample quantity and the ceramic crucible is used as the melting crucible. During packing, granule is packed with 2.5kgs/bag, and ceramic crucible 1,000pcs/box. Surely, the customized requirements can be negotiated.

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Inquire Tungsten Rhenium Disc on Nov. 3, 2020

 Chinatungsten inquires tungsten rhenium disc, if you can supply, please feel free to contact us for cooperation.

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Lanthanum Tungsten Electrode Price on Nov. 3, 2020

 Ø2.4x175mm lanthanum tungsten electrode price is 0.795USD/PC on Nov. 3, 2020, EXW, Xiamen, China. The grade quoted is WL20. As for the increasing of raw material and esp. the exchange rate, the price has been increasing a lot.

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Tungsten Block Price on Nov. 3, 2020

10x20x200mm tungsten block price is 185.00USD/PC on Nov. 3, 2020, EXW, Xiamen, China. The price of tungsten block has been adjusted as for the increasing raw material price and fluctuate exchange rate.

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Cerium Tungsten Electrode Price on Sep. 24, 2020

Ø2.4x150mm cerium tungsten electrode price is 0.678USD/PC on Sep. 24, 2020, EXW, Xiamen, China. The grade quoted is WC20. As for the increasing of raw material and esp. the exchange rate, the price has been increasing a lot.

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How to Weld Copper Bonded Tungsten Copper Electrode

The welding method of copper bonded tungsten copper electrode is silver brazing, which is the most popular method in our workshop. The silver welding material is used, so that the electricity conductivity can be maintained.

The copper bonded electrode is mainly used for spot welding, which is for the industry of steel vehicles. When used to weld, the welding method applied for the welding bodies is pressure welding, which is a welding method that do not used any welding material, but high pressure to joint two parts together, so that the work pieces is without resistance on the welding gap. Copper is a material with high electricity conductivity, which is used to convey electricity and generate heat for welding bodies.

For the welding method to the electrode itself, besides brazing, there are other welding methods, such as pressure weld, melting weld, etc.

Melting weld is metals welding and recrystallization, which is the same process of casting. This method is to heat the welded part until melting, the welded parts will be welded together after cooling. The methods include arc welding, gas welding, electroslag welding, electron beam welding and excitation welding. 

Pressure weld is make the welded part under great pressure and make the contacted surface without oxidized materials and other impurities. The welded two parts will be welded together when reached their stress range. Pressure weld is not applied any welding filling materials, but only pressure to move the oxidized materials on the surface and weld the workpieces together by certain pressure.

Brazing is applied liquid material to fill in the gap of two welded parts, and jointed them together. This method required a third metals, such as silver. Hard brazing and soft brazing are included in these two welding methods.

Even though these three methods can be used for the welding of copper and tungsten copper, silver brazing is still the widely used method. Any other welding methods or any opinion on tungsten copper are all welcomed to be discussed.

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Tungsten Alloy Application in Civil Industry

Tungsten alloy application in civil industry including mechanical industry, instrument industry, electricity industry, metallurgy, oil and chemical industry, sport industry, radiation shielding in medical and nuclear industry. The grade of tungsten alloy includes WNIFE, WNICU, WNIFECO, WNIFEMO, and the content from 90%W to 97%W.

1.0    Mechanical production

Tungsten alloy is with good performance of high density, high temperature resistance, high wear resistance and anti-oxidization, so it is widely used in mechanical production, including molding material, machining, etc. The material with tungsten alloy is with hardness of 24 to 32 HRC, which can be processed by carbide cutter.

2.0   Instrument Industry

Due to the high density of tungsten alloy, the unit weight higher than other metals, it is used as balancing weight, damper, adjusted weight, mobile weight, etc. The unit weight and shape can be customized.

3.0   Electrical Industry

With the advantage of good electricity conductivity, tungsten alloy is widely used in electrical processing industry, such as bucking bar, electrodes, and contactors.

4.0   Metallurgy, Oil and Chemical Industry

Tungsten alloy can be applied in forging steel, chemical industry, oil industry, metallurgy, filter. Due to the anti-corrosion and anti-oxidization, the alloy can be molds, tubes, thread type, crucibles, etc in these fields.

5.0   Radiation Shielding in Nuclear and Medical Industry

Because of the high density, the shielding effect of tungsten alloy is 40% higher than lead, it is good shielding to gama radiation and also widely used in nuclear material store and transport, medical shielding and thermal generator shielding.

6.0   Sports Industry

High density, small size are the reasons for tungsten alloy for sports industry, such as weight in racing car, ships, yacht, golf, dart, etc. For the small volume, the car, ships, yacht can own a higher speed and small resistance both on the land and in the sea.

Besides the above applications, tungsten alloy can also be the material to make name card, fishing weight, gold plated weight, etc. The dimensions can be customized according to the requirements of the customers.

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Lanthanum Tungsten Electrode Price on Aug. 26, 2020

Ø2.4x150mm lanthanum tungsten electrode price is 0.648USD/PC on Aug. 26, 2020, EXW, Xiamen, China. There are three most popular grades, WL10, WL15 and WL20. It is the best material to replace thorium tungsten electrode and used in GTAW.

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Tungsten Stream Mouth Chinese Standard

The current tungsten stream mouth Chinese standard refers to People's Republic of China Nonferrous Metals Industry Standard YS/T 854-2012 Tungsten Stream Mouth, which is issued by the Ministry of Industry and Information Technology of the People's Republic of China.

Any more details, please visit YS/ T 854-2012

1.Scope

This standard specifies the requirements, test methods, inspection rules, marking, packaging, transportation, storage, quality certificate and contract (or order) content on tungsten stream mouth.
This standard applies to the tungsten stream mouth which is made by powder metallurgy process and applied to aluminum silicate refractory fiber manufacturing industry.
Any more details, please visit YS/ T 854-2012

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Tungsten Iridium Stream Mouth

Tungsten iridium stream mouth is made of a body of tungsten and inserted a tube made of iridium, instead of the whole part to be an alloy of tungsten and iridium.

Iridium tube is used because of its advantages of anti-corrosion, high erosion resistance, insoluble in acids, good plasticity, and high elasticity modulus. And the body of tungsten is used also takes of its high density over 17.7g/cm3, high corrosion resistance, high temperature resistance and high erosion resistance to lots of acids.

Owing to these good properties, the tube is applied together with the body of tungsten part to be used in many industries, such as refractory ceramics, rare earth metal smelting, induction furnace heating and quartz glass melting.

Requirements of Tungsten and Iridium 

1.0 Density of tungsten body
The density of tungsten should be ≥17.7g/cm3.
2.0Bonding strength
3.0The bonding strength of tungsten and iridium tube should pass the testing of keeping iridium tube 10s without dropping under 1000g weight.
4.0 Appearance
The product appearance should be clean, smooth, no breakage, no holes, no deformation and other drawbacks.
The inner side of iridium tube should be smooth, no holes, no breakage and other drawbacks.

Bonding Strength Testing Method

The bonding of tungsten body and iridium tube has been the most difficult production process for the stream mouth. If the part is not bonded well, the tube is easily dropped, and the lifetime of the stream mouth is shortened, installation times are increased, production time is shortened, too. As a result, the manufacturing cost is going up a lot. Therefore, the dealing of the bonding has been very important.

The testing steps are putting the finished stream mouth on the platform as following, mouth is on the surface of platform, adding 1000g weight on the top of iridium tube, and keeping the weight 10s.

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Tungsten Card Gift

Everyone needs a gift and everyone deserves a gift. A special gift can be much impressive for consumers, clients, parents, brothers, sisters, friends, lovers, couples and anyone receives. If you ask me what is my favorite gift, I maynot able to reply at once. But if you buy me a special gift, I am surely receives with great happiness.

I have been in tungsten industry for almost ten years, and I have seen many kinds and types of gift made by tungsten, such as tungsten ring, tungsten bracelet, tungsten pig, etc. however, I never found a gift made as a name card, a luggage card. This is what I would like to recommend because it is special enough - tungsten card gift.

The card is made as thinner as 0.3mm, which is not as easy for tungsten as for tungsten is a refractory metal, it is made by powder metallurgy, and easily to make with breakage during forging. The thinner, the more difficult. Since we designed the tungsten card to be as similar as the name card and luggage card in the appearance, we try and try, and finally the thin sheet is made out. Under the great difficulty, even though we have been producing the thin sheet, we still can not produce large size, such as 500mm width, what we can manufacture is much smaller, but they are enough for us to make out this card. After thin sheet, we use wire cutting to cut the size as the name card of 90mmx50mm, and luggage card is much smaller 90mmx25mm. Surely these two sizes are not for all, they can be customized to similar ones.

After the card is shaped with the designed sizes, we deliver them to engrave, which can be engraved in black or white. As we also design with a QR code, we choose black to assure the code can be scanned. As for the engraving is applied laser engraving, an AI image is required, so that the engraved content can be clear. Content of names, telephones, websites, emails are tested, and they are all available to be engrave on the card, surely if you have got an AI image of company logo, they can also be typed on the surface.

Tungsten card is a special gift, so is the golden one, and anyone who would like to make an idea of tungsten gift, please do not hesitate to contact Chinatungsten Team. Innovations and discussion is welcomed.

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K Doped Tungsten Electrode

It has been a very popular situation for our company that our customers are inquiring a product, whose chemicals are unknown for both sides. The only one our customers know is the material related to tungsten. However, as for the large category of tungsten, it is difficult to provide a suitable material with such information, so that we have to find out a solution for that.

This time, we also encounter the same issue. We get a sample from our clients, and arrange the testing. As for tungsten is a refractory metal, which has been difficult to be used chemical method, we only test in by metal element analyzer. The testing result is that the material is with over 99.85% tungsten. Therefore, we recommend it as pure tungsten or K doped tungsten. 

Most of the customers are familiar with K doped tungsten wire but not electrode, actually K doped tungsten electrode is with the same chemical as the wire and the same properties, which is to decrease the deformation at high temperature. K is doped in the process of reduction from tungsten oxide to tungsten powder, which can assure the mixing result of the powder. During forging, as for the crystal of K is larger than tungsten, they are kept in the rod and forged together with tungsten. With content of 30~90ppm K, higher content, denser the K bubble, and better anti-deformation property. Following is an image showing the relationship between K content and K bubble clearly. 

There is a factor we need to point out that, during the production, the content of K is not as higher as better, as for K is also can be recommended as impurities, the forging process is influenced if the K is very high, such as higher than 120ppm, then the quality is influenced, for the bubble is existed in the rod and will be horizontal growing. Therefore, the ideal content of K doped is controlled in 30~90ppm for both wire and rod.

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Copper Bonded Tungsten Copper High Voltage Contact

With the development of high speed railway both in China and whole world wide, the application of high voltage related equipment has been increasing largely. High voltage contact is one of them. As for the contact of the electricity will result in high temperature and electricity conductivity, the choice of material have been very important. 

1.0  Hardness. Suitable hardness makes the larger contact, lower resistance, and also can lower down the contact temperature, decrease contact bonding, increase the wear resistance and longer the lifetime.

2.0  Electricity property. High electricity conductivity is a significant factor to connect the electricity system for the whole equipment operation. However, as for the contact momentary will direct into high temperature, therefore, the material requires high electricity conductivity and high temperature resistance, which assures the working and the contact will not be melted.

3.0  Thermal conductivity. The connection of electric contact will release high heat, which requires the material with high thermal conductivity, so that the heat can be conducted, but not gathered in the contact area and increase the high temperature of the point.

4.0  Chemical property. The contact should be with stable chemical properties, gas corrosion resistance and high volatility.

Considering the above factors, copper tungsten is chosen for it has owned all the above advantages, however, as for its thermal conductivity is still not enough for high voltage industry, it is welded on the copper part. Furthermore, in order to improve the electricity conductivity, the surface is always coated with a layer of silver.

 

This silver coated copper bonded tungsten copper contact is the best material for high voltage industry. The bonded part is applied both the moving and static contacts. Among them, the tungsten copper part can also be made with different contents, and 70W30Cu and 80W20Cu are used most widely. Surely, if your design is with customized drawings and materials, please do not hesitate to contact Chinatungsten by sales@chinatungsten.com.

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