2022年11月9日星期三

Tungsten Sheet Price in early November 2022

Φ100x0.3mm tungsten sheet price is 4.60 USD/PC in the first half of November 2022, EXW XIAMEN, CHINA. 

Tungsten sheets can be as thin as 0.01mm or as thick as 127mm, with widths typically ranging from 10mm to 800mm. They can be used in many different applications and is valued for its corrosion resistance, ability to withstand extremely high temperatures, and ability to create rigidity and hardness when combined with other metals in the alloy.

Tungsten is used in the aerospace, research, building materials and light bulb industries. It is the predominant metal in electric furnace heating elements, as well as in any assembly where high pressure/high temperature environments are expected. Sheets made of tungsten are commonly used in furnace construction, but are also important for making parts for the electronics and semiconductor industries, and can be found in a variety of lighting, vacuum plating, electronic vacuums and shielding.

tungsten sheet price photo

If you have any inquiry of tungsten sheet, please feel free to contact us:
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Lanthanated Tungsten Electrode Price in Early November 2022

Ø3.2x175mm lanthanated tungsten electrode price is 1.90 USD/PC in the first half of November 2022, EXW XIAMEN, CHINA. 

Wl20 electrodes contain at least 1.7% to 2.2% lanthanum for excellent arc starting, low burnout rate, good arc stability and excellent re-ignition characteristics. They are ideal if you want to optimize your welding capabilities. They can work well on either AC or DC electrode negatives with tips, or they can be used with AC sine wave power supplies. The tungsten electrode adding with rare earth element lanthanum holds sharp tips well, which is an advantage for welding steel and stainless steel on DC or AC from square wave power sources.

lanthanated tungsten electrode price photo
If you have any inquiry of lanthanated tungsten electrode, please feel free to contact us:
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2022年11月4日星期五

Tungsten Needles and Tungsten Rhenium Needles Used in the Construction of Probe Cards

Tungsten needle, also named tungsten pin, mainly refer to thin tungsten rod or thin tungsten rod with sharp tip. Their properties are basically the same, but uses are different. Mostly, their diameters are usually below 2mm and lengths range from 15mm to 100mm. 

For thin tungsten rod, it is mainly used as an electrode for argon arc welding. During welding, an arc will be generated between the tungsten electrode and the workpiece, and under the action of the arc heat, the filler metal will melt with the workpiece to form a weld.

Tungsten rod with pointed tip can be simply understood as pure tungsten or tungsten alloys with pointed tips at one end or both ends, which are mainly used as instrument probes, such as digital four-probe testers. The distance between the four tungsten needles in the digital four-probe tester cannot be too long or too short, and each one has a different function.

tungsten probes photo

The rods with pointed tip are usually called tungsten probes. Most integrated circuits are tested using cantilever blade and epoxy ring probe cards. Contact resistance, balanced contact force and card life are directly dependent on probe material and shape. Therefore, a critical design step for any card is the specification of the probes.

In blade cards, probes are soldered to metal or ceramic blades, which in turn are mounted to a printed wiring board (PWB) to match the contact land pattern of the device under test. For epoxy ring cards, the probes are arranged in a contact pad pattern, embedded in the epoxy ring, and the bake-hardened assembly is bonded and soldered to the PWB.

The use of tungsten rhenium (WRe) needles in probe card construction has grown considerably over the past two years. Traditionally, tungsten (W) probes have been used for many reasons - excellent stiffness, hardness and wear properties.

tungsten probes photo

The growing acceptance of WRe as an alternative probe material seems to be mainly due to the good user experience. Chinatungsten/CTIA GROUP found both tungsten and WRe materials were effective in scrubbing the contact pads. But due to its higher hardness, the WRe probe exhibits excellent resistance to tip fouling and better overall lifetime characteristics.

Chinatungsten/CTIA GROUP are professional manufacturers of tungsten for more than two decades, please feel free to contact us if you have any purchasing plans for tungsten and tungsten rhenium needles. 

If you have any inquiry of tungsten needles, please feel free to contact us:
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2022年11月1日星期二

A New Production Method to Make Tungsten Target

Tungsten target, also known as tungsten sputtering target, is a typical pure tungsten product with high purity, high melting point, high density, high deflection strength, good thermochemical stability, low resistance, non-toxic and non-radioactive characteristics. It is widely used in flat panel displays, solar cells, integrated circuits, automotive glass, medical equipment and other industries. 

The researcher with the patent number CN102513789A provides a method for producing it and steps are as follows:

Provide target blanks; machine the surface of the blanks; put the machined blanks into a vacuum jacket and vacuumize, and the vacuuming step is done through a degassing tube; forge the blanks in the vacuum jacket; the blanks in the vacuum envelope are calendered; after the calendering, cooling is performed and the vacuum envelope is removed.

tungsten target photo

Notes on this method:

1) After the described vacuuming, also need to carry out the step of heat treatment for the first time to the vacuum envelope: after being carried out to a temperature of 200 ℃~500 ℃, carry out the insulation step. During the heating and heat preservation process, the vacuum was continuously pumped so that the vacuum degree in the vacuum envelope was at least 10^-3Pa, and then the forging step was performed on the tungsten target material blank in the vacuum envelope.

2) A second heat treatment of the blank is required before the forging step is performed on the blank in the vacuum jacket. The temperature of the second heat treatment is 900 ° C ~ 1500 ° C, and is kept at this temperature for 1h ~ 5h.

3) After the forging step is performed on the tungsten blank in the vacuum envelope and before the calendering step is performed on the blank in the vacuum envelope after forging, a third heat treatment is also performed on the blank in the vacuum envelope. The temperature of the 3rd heat treatment is 900 DEG C~1500 DEG C, and is kept at this temperature for 0.8h~1h.

tungsten target photo

Compared with the prior art, the production method has the following advantages: no mold is required, the problems of cracks and easy surface oxidation when the billet is processed and extended in the air can be avoided, and the internal structure is uniform and the grain size is consistent. The tungsten targets required by sputtering targets have the advantages of easy processing and low rejection rate.

If you have any inquiry of tungsten target, please feel free to contact us:
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