Tungsten

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Factors Affecting the Mechanical Strength of Barium Tungsten Electrodes 99

The mechanical strength of barium tungsten electrodes is the result of the combined effects of material composition, microstructure, preparation process and working environment. To improve the strength, the barium content can be optimized, the grain size can be controlled, the sintering process can be improved, the internal defects can be reduced, and the surface quality can be ensured. In practical applications, each influencing factor needs to be weighed according to the specific conditions of use. Factors Affecting the Mechanical Strength…

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Factors Affecting the Surface Active Substances of Barium Tungsten Electrodes 70

The factors affecting the surface active substances of barium tungsten electrodes can be comprehensively analyzed from multiple dimensions such as material composition, preparation process, working environment, surface treatment, impurity pollution and use time, as follows: 1. Material Composition and Preparation Process 1.1 Barium Tungsten Ratio Barium Content: As an active substance, the content of barium directly affects the electron emission efficiency. Too high a content will lead to increased volatilization of barium at high temperature and reduce the life of…

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Factors Affecting the Long-Term Stability of Barium Tungsten Electrodes 53

The factors affecting the long-term stability of barium tungsten electrodes and their mechanisms of action are as follows: 1. Material Composition 1.1 Barium-Tungsten Ratio: Influence: The barium content directly affects the electron emission efficiency and surface stability. A moderate amount of barium can reduce the work function, but an excessive amount will lead to uneven surface distribution and accelerate oxidation or volatilization. Mechanism: Barium and tungsten form compounds (such as BaWO?), and optimizing the ratio can balance the emission performance…

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Factors Affecting the Surface Energy of Barium Tungsten Electrode 39

The surface energy of barium tungsten electrode is affected by many factors such as intrinsic properties of the material (such as barium content, crystal structure), surface state (roughness, oxide layer), environmental conditions (temperature, vacuum degree) and preparation process (heat treatment, surface modification). In practical applications, optimizing these influencing factors can improve the electron emission performance and stability of the electrode. 1. Material Composition and Structure: 1.1 Barium Content and Distribution: As an active element, the content and distribution of barium…

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Molybdenum Electrode 79

As a key component made from the transition metal molybdenum (with purity exceeding 99.95%), a molybdenum electrode—known as “molybdenum electrode” in English—shares physicochemical properties highly similar to pure molybdenum. Its typical diameter ranges from 20 mm to 152.4 mm, and its length can extend up to 1,500 mm. Notably, a molybdenum electrode differs significantly from a tungsten electrode in both shape and application. Physicochemical Properties Molybdenum electrode appears as a silver-gray solid with a metallic luster. It features a high…

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Molybdenum Boat 70

As a typical product of the transition metal molybdenum, a molybdenum boat, also known as an evaporation molybdenum boat or coating molybdenum boat, is made from molybdenum sheets or molybdenum-based alloys through welding or high-temperature stamping. It serves as a critical sintering carrier for molybdenum powder and other metal powders, with its English name being “molybdenum boat”. Physicochemical Properties Molybdenum boat generally exhibits high density, high melting point, high strength, low thermal expansion coefficient, high-temperature resistance, corrosion resistance, excellent creep…

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Characteristics of Molybdenum Copper Sheet 115

Molybdenum copper sheet is a composite material made from metallic molybdenum (Mo) and copper (Cu) through powder metallurgy or infiltration processes. Due to its excellent thermal, electrical, and chemical properties, it is widely used in many fields: in electronics for chip packaging substrates, power device heat sinks, and microwave device heat dissipaters; in aerospace for high-temperature components of spacecraft and satellite communication antenna substrates; and also in medical equipment as heat dissipation parts for superconducting magnets. Generally, the physical and…

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What Is Molybdenum Copper Sheet? 80

Molybdenum copper sheet is an alloy material mainly composed of metallic molybdenum (Mo) and copper (Cu). It is formed through powder metallurgy, infiltration, and other processes to create a functional material with synergistic properties. Its microstructure typically shows a uniform distribution of molybdenum and copper phases or a composite form where copper fills the molybdenum skeleton. From a materials science perspective, molybdenum copper sheet combines the high melting point and low thermal expansion coefficient of molybdenum with the high thermal…

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Why Is Ammonium Metatungstate Powder White? 79

Ammonium metatungstate powder (molecular formula H??N?O??W??, AMT), as a key intermediate in tungsten chemical industry, exhibits a white appearance resulting from the combined effects of its molecular structure, electronic transition characteristics, and crystal physical morphology. The molecule of ammonium metatungstate consists of ammonium ions (NH??) and metatungstate anions ([W??O??]??), with the core feature being a polytungstate cluster anion. This anion is formed by 12 tungsten atoms and 41 oxygen atoms linked through covalent and coordinate bonds into a complex polyhedral…

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Differences Between Ammonium Metatungstate and Ammonium Heptamolybdate 65

Although both ammonium metatungstate (AMT) and ammonium heptamolybdate (AHM) are important transition metal compounds with wide applications in the chemical industry, they differ in terms of chemical composition, molecular structure, physical and chemical properties, production technologies, and specific applications. 1. Molecular Structure Differences Ammonium Metatungstate (H???N?O??W??) is a white powder belonging to the class of tungstates, while Ammonium Heptamolybdate ((NH?)?Mo?O??·4H?O) is a molybdate compound that appears as a colorless or slightly greenish rhombic crystal. The two compounds differ significantly in…

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