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Factors Affecting the Thermal Cycle Performance of Barium Tungsten Electrodes 22

The thermal cycle performance of barium tungsten electrodes refers to their ability to maintain structural integrity and performance stability during repeated heating and cooling. The main influencing factors are as follows: 1. Material Properties Thermal Expansion Coefficient: The thermal expansion coefficient determines the volume change of the electrode when the temperature changes. If the thermal expansion coefficient is too large or too small, it may cause thermal stress concentration, causing cracks or fractures. Thermal Conductivity: High thermal conductivity helps to…

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Factors Affecting the High Temperature and Pressure Adaptability of Barium Tungsten Electrode 24

Barium tungsten electrode (usually refers to tungsten-based cathode impregnated with barium salt) is widely used in high-power microwave tubes, high-pressure gas discharge lamps, plasma sources and other equipment that require high temperature and high pressure environment due to its excellent electron emission ability and certain high temperature resistance. Its high temperature and high pressure adaptability is subject to the interaction of multiple complex influencing factors, which can be mainly summarized as follows: I. Material Properties 1. Tungsten Skeleton Performance: 1.1…

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How to Avoid Surface Contamination of Barium Tungsten Electrode? 25

Surface contamination control of barium tungsten electrode requires comprehensive management from multiple dimensions such as material design, process optimization, environmental management, operating specifications, and use conditions. By accurately controlling the barium tungsten ratio, optimizing the preparation process, maintaining a high vacuum/inert environment, strictly following operating specifications, and reasonably selecting electrical parameters, the electrode’s anti-pollution ability and service life can be significantly improved. I. Influence of Material Properties and Preparation Process 1. Control of Barium Tungsten Ratio Barium Content: An appropriate…

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Preparation Cost Factors of Barium Tungsten Electrode 12

Barium tungsten electrode is an important cathode material, widely used in vacuum electronic devices such as microwave tubes, X-ray tubes, etc. Its preparation cost factors include raw materials, energy, equipment, labor, production efficiency and scrap rate. 1. Raw Material Cost Tungsten powder and barium compounds are the core raw materials for preparing barium tungsten electrodes. As a rare metal, tungsten has a high price and obvious fluctuations, and the quality and price of barium compounds will also have a direct…

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Molybdenum Bar 12

As a typical product made from the refractory metal molybdenum (Mo), molybdenum bar is a rod – shaped item with molybdenum as its primary raw material. Therefore, it is often referred to as a molybdenum rod or molybdenum stick. In English, it is known as “molybdenum bar” or “molybdenum rod.” With a purity of up to 99.7%, it is widely used in metallurgy, power equipment, and other fields due to its excellent thermal, mechanical, chemical, and electrical properties. From the…

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Tungsten Nut 10

Similar to tungsten alloy dart shafts, the tungsten alloy nut is a common tungsten product made with refractory metal tungsten as the base and metals like nickel and iron as auxiliary materials. It features a central hole with internal threading. In production and application, it is often referred to as a tungsten nut or tungsten cap, with the English name Tungsten Alloy Nut or Tungsten Nut. Tungsten nut typically exhibits high density, great hardness, high strength, oxidation resistance, high- and…

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Yttrium Tungsten Electrode 16

The yttrium tungsten electrode is a composite electrode made from tungsten and yttrium, created by adding an appropriate amount of yttrium oxide (Y?O?) as a modifier to a pure tungsten electrode. Its English name is yttrium tungsten electrode, with a common grade of WY20, a blue color-coded tip, diameters ranging from 0.5mm to 12.0mm, and lengths typically of 150mm or 175mm. The yttrium tungsten electrode combines the traits of pure tungsten electrodes and yttrium oxide, featuring a high melting point,…

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Tungsten Putty 16

Tungsten putty is a novel tungsten product made by bonding tungsten powder with a high-molecular polymer. Unlike typical tungsten products, it differs significantly in both shape and physicochemical properties. It is neither in the form of tungsten oxide powder nor the appearance of high-density tungsten alloys. Physicochemical Properties Tungsten Putty combines the characteristics of tungsten powder and high-molecular polymers. Its appearance resembles solid grease with a glossy, oily surface. Key features include high density, strong oxidation resistance, excellent plasticity, superior…

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Why Is Ammonium Metatungstate Solution Acidic? 16

Ammonium metatungstate (AMT) is a significant tungstate compound, typically represented by the chemical formula (NH?)?H?W??O??·nH?O (where n is the number of water molecules of crystallization, commonly 1 or 2). Structurally, it belongs to the polyoxometalate family known as “tungsten clusters.” Its core structure consists of 12 tungsten-oxygen octahedra connected through shared oxygen atoms, forming a cyclic or cage-like framework, with ammonium ions and protonated water molecules filling the gaps. The polytungstate anion [H?W??O??]?? forms through the polymerization of tungstic acid…

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Factors Affecting the Electronic Work Function of Barium Tungsten Electrode 27

The electronic work function of barium tungsten electrode is its core performance indicator, which directly affects its emission efficiency, operating temperature and life as a hot cathode. The factors affecting the electronic work function of barium tungsten electrode mainly include the following aspects: 1. Material Composition The chemical composition of barium and tungsten in the electrode directly affects the electronic work function. The purity of barium and tungsten and their different ratios will cause the work function to change. For…

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