Tungsten

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Manufacturing Process of Barium Tungsten Electrode 17

Barium tungsten electrode is a material widely used in electron tube cathodes, and is valued for its good emission performance and stability. The manufacturing process of barium tungsten electrode is mainly based on the impregnation method, which can effectively avoid the problems of barium volatilization and uneven distribution that may be caused by direct mixed sintering. It is a relatively mature and commonly used process. The preparation of barium tungsten electrode usually includes the following main steps: 1. Preparation of…

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Preparation of Barium Tungsten Electrode by Impregnation Method 12

The preparation of barium tungsten electrode by impregnation is a process commonly used in electron emission materials (such as hot cathodes). By impregnating active barium compounds into porous tungsten substrates, composite electrodes with high-efficiency electron emission performance are formed. The following is a detailed preparation process and key points: 1. Preparation of Porous Tungsten Substrate Method: Powder metallurgy technology is used. Raw materials: High-purity tungsten powder (particle size is selected according to pore requirements). Molding: Form a porous preform by…

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Preparation Process of Barium Tungsten Electrode 15

The key preparation processes of barium tungsten electrode include porous tungsten matrix, barium impregnation reduction, etc. The following is its main process flow: I. Preparation of Porous Tungsten Matrix 1. Raw material selection: high-purity tungsten powder (more than 99.95%), the particle size is usually 1-5 μm. 2. Molding and pre-sintering: Molding or cold isostatic pressing, pressure 100-300 MPa, to form a porous green body. Pre-sintering (800-1200℃) in hydrogen or vacuum environment, initially remove impurities and enhance the strength of the…

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Core Advantages of Barium Tungsten Electrodes 14

As a high-performance electrode material, the core advantages of barium tungsten electrode are reflected in the following four aspects: I. Excellent Electron Emission Performance 1. Low work function and high current density The work function is only 1.6 eV (much lower than 4.5 eV of pure tungsten), and electrons are easier to leave the surface, achieving low-temperature and efficient emission. The current density is above 10 A/cm2, which significantly improves the energy output efficiency. For example, in HID lamps, barium…

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Disadvantages of Barium Tungsten Electrode 13

As a commonly used cathode material, although barium tungsten electrode is widely used in electron tubes and gas discharge tubes, it also has some significant disadvantages. In practical applications, it is necessary to weigh its advantages and disadvantages according to specific needs, and consider technical improvements or alternative materials to make up for these shortcomings. 1. Sensitive to Oxidation Barium tungsten electrode is very easy to oxidize in air. When exposed to oxygen, an oxide layer will quickly form on…

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Advantages of Barium Tungsten Electrode 13

Barium tungsten electrode is a cathode material widely used in electron tubes and gas discharge tubes. It occupies an important position in related fields due to its unique properties. 1. Low Work Function The work function of barium tungsten electrode is low, usually between 1.6 and 2.0 electron volts. This feature makes it easier for electrons to escape from the cathode surface, greatly improving the efficiency of electron emission. This advantage is particularly prominent in devices that require efficient electron…

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Working Principle of Barium Tungsten Electrode 23

The barium tungsten electrode is a highly efficient thermionic electron emission cathode. Its working principle is based on the reduction of the work function of the tungsten substrate surface by the active substance of barium, thereby significantly improving the electron emission efficiency. The following is a detailed analysis of its working principle: 1. Basic Structure and Materials of Barium Tungsten Electrode Tungsten substrate: As the main material of the electrode, tungsten can maintain structural integrity at high temperatures due to…

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Composition and Structure of Barium Tungsten Electrode 21

Barium tungsten electrode is an electrode material designed to improve the performance of electron emission. Its composition and structure are precisely designed to meet the special needs of high-intensity gas discharge lamps and other fields. The following is an explanation from four aspects: composition, structural characteristics, preparation process and performance advantages: I. Analysis of the Core Components of Barium Tungsten Electrodes. 1. Matrix Material: Tungsten Sponge High-purity tungsten powder (impurity content must be controlled at 0.001%-0.002%) is used to form…

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What is a Barium Tungsten Electrode? 22

Barium tungsten electrode is a composite electrode material made of tungsten (W) and barium (Ba) compounds, mainly used in electron emission devices such as cathode ray tubes (CRTs), X-ray tubes and electron guns. It combines the high melting point, corrosion resistance and mechanical strength of tungsten with the low work function characteristics of barium to achieve efficient thermal electron emission. Barium tungsten electrodes are usually composed of the following two parts: Tungsten Substrate: Tungsten is a high melting point metal…

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Application of Ammonium Metatungstate in Catalyst Field 22

Ammonium metatungstate (AMT), a transition metal compound, is widely utilized in the catalyst field. Whether in catalytic cracking, hydrorefining, olefin epoxidation, or alcohol oxidative dehydrogenation, its unique structure and high activity have driven significant technological advancements, facilitating the efficient production of clean fuels and fine chemical products. I. Petrochemical Field Catalytic Cracking Reaction: In the oil refining process of the petrochemical industry, catalytic cracking is a critical step for enhancing the value of heavy oil, and AMT-based catalysts play an…

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