100 Years of Doped Tungsten WireⅠ- Early Attempts at Metallurgy

Auer gas mantle lamps image

From a historical perspective, William D. Coolidge's development PM process and tool "for making tungsten ductile" in 1909 marked the beginning of the use of tungsten filaments in the lighting industry. William D. Coolidge's development of the PM process and tools to "make tungsten ductile" in 1909 marked a breakthrough in the use of tungsten filaments in the lighting industry and began the modern industrial era of Powder Metallurgy.

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100 Years of Doped Tungsten Wire Ⅳ- Scientific Background of Doped Tungsten Wires and Outlook

Atomistic modelling of grain boundary fracture in tungsten image

Scientific background of doped tungsten wires

The systematic and purposeful doping of tungsten oxide powders was already patented in 1922. However, the doping of elemental potassium and its role in the formation and stabilization of creep-resistant recrystallization intercalated microstructures was only understood after 1964, when new tools for scanning and transmission electron microscopy and new instruments for surface analysis, especially Auger-Electron-Spectrometry (AES), could be used to perform modern microstructural and chemical analysis of nanometer-sized aggregates. Modern microstructural and chemical analyses were performed.

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100 Years of Doped Tungsten Wire Ⅲ - The Invention of Hard Metals

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The Invention of Hard Metals

The next important milestone in the chronology of the development of doped tungsten wires is 1923, which marked the year when K. Schröter, chief engineer of the OSRAM research group in Berlin, Germany, made a cemented carbide or hard metal by combining tungsten carbide (WC) and cobalt powder through mixing, pressing and liquid-phase sintering.

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100 Years of Doped Tungsten WireⅡ- The Coolidge Process

CA and old fashioned first Mazda Coolidge lamp image

The Coolidge Process

William D. Coolidge (1873-1975), Figure 8, began his career at GE's research laboratory in September 1905. Interestingly, Coolidge's first task was to investigate the cause of the rapid breakage of the filament of the German tantalum lamp when operating under alternating current, most likely due to the limitations of the lamp's cavity technology and the residual gas in the bulb.

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Pure Tungsten Pins Is Used for Probes and Cathode Emission

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Tungsten pins, also named tungsten needles or tungsten electrodes, are a typical tungsten product with purity of 99.95%. It has a silver-white appearance, a slender structure, a length of 20mm-1000mm, and a diameter of 0.3mm-10mm. Usually, the product is customized. 

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3D Printed Collimators for Physical Optics Enables Lower Costs

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A collimator, a device used to transform the diverging light or other radiation from a point light source into a parallel beam. Special measurements in spectroscopy and in geometric and physical optics require this kind of collimation.

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3D Printing Pure Tungsten Parts in the Medical Industry

3D printed tungsten collimator photo

Tungsten, also known as Wolfram, is a rare metal known for its highest melting point of all elements. In addition to excellent temperature resistance, the material also has strong abrasion resistance and chemical resistance. These good properties make it an ideal material for components that operate at extreme temperatures.

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What Is the Best Material for X-ray Collimation – Tungsten Metal or Tungsten Alloy?

tungsten collimator image

A collimator is a device used to transform the divergent light or other radiation from a point light source into a parallel beam, and also is an absorber device used to limit X-rays, gamma rays, or nuclear particle beams to the size and angular spread required for a specific application. Normally, special measurements in spectroscopy and geometric and physical optics require this kind of light collimation.

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Why Use Thorium Tungsten Wires as Ion Source?

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Many analytical and medical devices are using thorium tungsten wires as ion source. Why use thorium tungsten materials? What about tungsten or neodymium tungsten materials? 

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How is tungsten wire made?

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Tungsten wire owns high resistivity and melting point, good strength, and low vapor pressure, which is the best material for making incandescent filaments in all pure metals. However, how is the thin tungsten wire made? As the tungsten is hard, brittle, and difficult to proccess.

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Tungsten Disulfide Powder Usage

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The usage of tungsten disulfide powder is it can be used in high temperature and high-pressure applications. It offers temperature resistance from -450 degree F (-270℃) to 1200 degree F (650℃) in normal atmosphere and from -305 deg F (-188℃) to 2400º F (1316℃) in vacuum.

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Tungsten Disulfide Coating

tungsten disulfide coating used in gear image

Tungsten disulfide coating is an extremely slick, dry film lubricant coat. WS2 has an extremely low coefficient of friction of 0.03 — lower than that of teflon, graphite, or molybdenum disulfide. The film is remarkably durable compared to many other lubricant materials and can withstand tremendously high loads of over 300,000 psi.

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Tungsten Disulfide Applied in Nanotube

tungsten disulfide nanotube structure image-1

Tungsten disulfide has a layered structure related to MoS2, with W atoms situated in trigonal prismatic coordination sphere. Owing to this layered structure, WS2 forms inorganic nanotube was discovered on an example of WS2 and has been the first material which is able to form it in 1992.  

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Tungsten Disulfide Property

tungsten disulfide molecular structure image

Tungsten disulfide property is diamagnetic, lubricious and easy to be dissociative. It is a compound of tungsten and sulfur, chemical formula is WS2, molecular weight 247.97, the state is black gray powder, appears in the natural world as a tungstenite. The relative density is 7.510. It adopts a layered structure related to MoS2, with W atoms situated in trigonal prismatic coordination sphere. 

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Spherical Tungsten Carbide Powder Property and Application

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Spherical tungsten carbide powder has the microstructure of fine equiaxed dendrites, its morphology of dense homogeneous spherical WC particles. It maintains a stable chemical property, good fluxibility and hardness, and outstanding wear or abrasion resistance. 

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Spherical Tungsten Powder Production Methods - 2/2

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Many spherical tungsten powder manufacture methods have been researched and developed by  advanced technologies to comply with the more strictly usage requirements in different industries. Below are another two tungsten-hydrogen halide reduction methods.

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Spherical Tungsten Powder Production Methods - 1/2

spherical tungsten powder image

Spherical tungsten powder’s particle size for producing cemented carbide has been changing smaller of the past 20 years. As the fine-grained cemented carbide tungsten powder can significantly improve the hardness and strength of the alloy. 

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0.7nm Tungsten Selenide (WSe2) Been Developed

tungsten selenide diode structure image

0.7nm tungsten diselenide (WSe2) diode has been successfully developed by Dr. Lin’s team from integrated Synchrotron Radiation Research Center of Taiwan Hanyu energy technology company, it’s meaningful of our humans have finally broken the semiconductor 3nm process limit, surpassing Moore's Law and directly entering the sub-nano era (<1 nm). It also reveals that the era of compound semiconductors will eventually replace silicon semiconductors.

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Bismuth Cobalt Tungstate Composite Photocatalyst

bismuth cobalt tungstate composite photocatalyst image

Global environmental pollution restricts the progress of human civilization, and the elimination of environmental organic pollutants requires a lot of energy, which poses a serious challenge to the increasingly depleted energy. Research shows that almost all organic pollutants can be effectively degraded, decolored and detoxified by semiconductor photocatalysis. Mineralization into inorganic small molecular substances, thereby eliminating environmental pollution and hazards.

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Almonty Industries to Improve Tungsten Concentrate Output at Panasqueira Mine in Portugal

APT photo

Almonty Industries Inc. is pleased to announce that the ore sorting equipment has arrived at its Panasqueira mine in Portugal. The equipment was released by customs last week and during the 23rd and 24th of July 2018, the entire installation arrived at the mine.

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