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Chemical Properties of Barium Tungsten Electrode 21

Barium tungsten electrode is a functional material that combines the electron emission characteristics of barium with the high-temperature stability of tungsten. Its chemical properties can be analyzed from the following aspects: 1. Composition and Structure The role of barium: As an alkaline earth metal, barium has a low work function, which significantly improves the electron emission ability of the electrode and is often used as a cathode material. Under high temperature or electric field, barium may exist on the surface…

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Physical Properties of Barium Tungsten Electrode 25

Barium tungsten electrode is a special electrode material widely used in electronic tubes, gas discharge lamps and other equipment. Its physical properties are the key to its performance and application. The following are the main physical properties of barium tungsten electrode: 1. Electron Emission Performance Barium tungsten electrode has excellent electron emission performance, especially under high temperature conditions, it can emit electrons stably. This makes it particularly suitable for use as a thermionic emission cathode that requires high current density.…

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Production Steps of Barium Tungsten Electrode 40

Barium tungsten electrode (BaO-W electrode) is a key electrode material used in gas discharge lamps (such as high-pressure sodium lamps and metal halide lamps). Its production steps are as follows: I. Raw Material Preparation 1. Tungsten Matrix: Select high-purity (≥99.95%) tungsten rods or tungsten wires and process them into the required shape (such as tip, cylinder) through forging, drawing and other processes. The surface needs to be polished or sandblasted to increase the specific surface area. 2. Barium Source: Barium…

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Manufacturing Process of Barium Tungsten Electrode 33

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 28

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 29

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 38

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 27

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 24

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 41

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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