Tungsten Needles Are Applied in Microscopy

Tungsten needles are made from the material with high melting, high density, good corrosion resistance and electrical conductivity. They can be used for several applications in microscopy. Specifically, the following are common applications: 

Atomic Force Microscope (AFM): An atomic force microscope is a high-resolution surface topography measurement instrument. In AFM, needles made of tungsten are used as probes or probes. They interact with the sample surface to acquire high-resolution topographical images and measure surface forces and properties.

Phonon Scanning Tunneling Microscope (STM): STM is an instrument used to study the structure and properties of the surface of materials. In STM, a tungsten needle is used as a scanning probe. They sense and measure the electronic properties of sample surfaces through quantum tunneling and produce high-resolution atomic-scale images.

Transmission Electron Microscope (TEM): A TEM is an instrument used to observe and analyze the internal structure and properties of materials. In TEM, W needles are often used to prepare ultrathin sections of samples. They are used to cut materials, obtaining nanoscale flakes for high-resolution imaging and analysis under a transmission electron microscope.

Scanning Electron Microscope (SEM): A SEM is an instrument widely used in the observation and analysis of surface topography. In SEM, a tungsten needle is used as the cathode of the electron gun. They generate high-energy electron beams that are used to excite electrons on the sample surface and generate microscopic images.

The specific application of tungsten needles in microscopes will vary according to different microscope types and experimental needs. Therefore, in practical applications, it is very important to choose the proper shapes, sizes and characteristics to ensure the best microscope performance and results.

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various kinds of tungsten needles as per the drawings. Please free feel to contact us when you got the purchasing plans.

If you have any inquiry of tungsten needles, please feel free to contact us:
Email: sales@chinatungsten.com/sales@xiamentungsten.com
Tel.: +86 592 5129696/+86 592 5129595

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Why Tungsten Needles Are Suitable for Microscopy Applications

The reason why tungsten needles can be used in microscopes is that they have some special properties and characteristics that make them suitable for various applications in microscopes. Here are some reasons: 

High melting point: Tungsten material has an extremely high melting point, about 3410 degrees Celsius. This allows this mental needle to withstand high-temperature environments in the applications of microscopy, such as electron microscopy, where they are used to generate beams of high-energy electrons. Its high melting point ensures that the needle can work stably for a long time without melting or losing its shape.

High hardness and wear resistance: Tungsten is a very hard material with excellent wear resistance. In the applications of microscopy, they are often required to contact and manipulate sample surfaces, and their high hardness and wear resistance allow them to withstand these stresses and maintain a long service life. In addition, its hardness can also provide high-resolution imaging and detection capabilities.

Sharpness and Small Size: W needles can be fabricated into very sharp and small shapes, enabling them to achieve extremely high spatial resolution in microscopy applications. This allows them to be used for atomic-scale imaging, surface topography measurements, and sample manipulation, as in atomic force microscopy and phonon scanning tunneling microscopy.

Excellent conductivity: Tungsten is an excellent conductive material with low resistivity and high conductivity. This enables them to provide stable electron flow and electrical signal transmission in electron microscopy and electrochemical applications.

Given that, tungsten needles are an ideal material for various microscopy applications. They can withstand high temperature, high stress environments, provide high-resolution imaging and detection capabilities, and have long life and stability, thus providing reliable tools and support for research and analysis of microscopy. 

Chinatungsten Online is a professional manufacturer of tungsten and molybdenum for nearly thirty years. We can supply various kinds of tungsten needles as per the drawings. Please free feel to contact us when you got the purchasing plans.

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

Email: sales@chinatungsten.com/sales@xiamentungsten.com

Tel.: +86 592 5129696/+86 592 5129595

Fax: +86 592 5129797

Scan QR code of Chinatungsten Wechat platform to follow up the daily latest price and market of tungsten, molybdenum and rare earth.

EB Tungsten Filament Price in July 2023

The latest price of φ0.8mm EB tungsten filament is USD 2.00/PC, EXW XIAMEN, CHINA in July 2023. 

Tungsten filaments, also called cathodes or electron emitters or electron sources, are mainly made of high-quality tungsten. Of all pure metals, tungsten has the highest melting point (3422°C), the lowest vapor pressure at temperatures above 1650°C, and the highest tensile strength. Tungsten also has the lowest coefficient of thermal expansion of all pure metals. This combination of properties makes tungsten an ideal material.

Tungsten can be used in both thermionic electron guns and field-emission (CFE) electron guns. Electron beams come from filaments made of various materials. The most common is the tungsten hairpin gun, which is widely used in scanning electron microscopes, transmission electron microscopes, and microprobe systems. This filament is a tungsten ring that acts as a cathode. Apply voltage to the loop to heat it up. The anode, which is positive relative to the filament, forms a strong attraction to electrons. This causes electrons to be accelerated towards the anode. Some accelerate near the anode and down the column to the sample.

An electron gun works at a high temperature, which is required for thermionic emission. For this, a filament or the cathode should be of a material that has a high melting point in order for it to continuously emit electrons. Tungsten filament is folded with various shapes to help in focusing the electron beam.

If you have any inquiry of tungsten filament, please feel free to contact us:
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Cerium Tungsten Electrode Price in July 2023

The latest price of φ2.4x175mm cerium tungsten electrode is USD1.00/PC, EXW XIAMEN, CHINA in July 2023. 

Cerium tungsten electrode (WC20) is alloyed with about 2% cerium oxide. It is a non-radioactive, refractory or non-consumable metal electrode material, which is the preferred substitute for thorium tungsten electrodes. Regular diameter of the electrode is between 0.5mm and 12.0mm, and the length is 150mm and 175mm.

The addition of this small percentage of cerium oxide increases the electron emission qualities of the electrode which gives them a better starting characteristic and a higher current carrying capacity with no spitting. With the increase of cerium oxide content, the ablation resistance and arc starting of cerium tungsten electrode will increase; with the increase of use time, the welding performance will gradually decrease.

The electrode has excellent arc starting properties at low current, and can operate successfully with AC or DC electrode negative. If used on higher current applications, the cerium oxide July be concentrated to the excessively hot tip of the electrode. In addition, WC20 is also used in inert gas shielded arc welding, hydrogen atom welding, argon arc surfacing, pulse argon arc welding, plasma welding, plasma cutting, plasma spraying, plasma melting, etc. The welding materials can be carbon steel, stainless steel, silicon copper, copper, bronze, titanium and so on.

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