Overview of High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention
Tungsten is a metallic element with the element symbol W and atomic number 74. It is located in the VIB group of the sixth period of the periodic table of elements. In nature, tungsten mainly exists in the form of hexavalent cations. Its ionic radius is small, it has strong polarization ability, and it is easy to form complex anions.
When preparing pure tungsten or tungsten alloy, the main methods include powder metallurgy, smelting (including electron beam melting, vacuum melting, plasma beam melting) and chemical vapor deposition.
Feature of High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention
The thermal expansion coefficient of tungsten is very low, only 4.5×10^-6 m/mK, so it has good thermal stability. These properties make tungsten widely used in manufacturing high-temperature components and reliable heat detectors.
(High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention)
Parameters of High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention
The high purity and ultra-fine tungsten carbide (WC) powder used for thermal spraying applications, specifically for wear resistance and corrosion prevention, typically has the following parameters:
1. Particle Size Distribution: Ultra-fine WC powders usually have a particle size distribution ranging from 30 microns to 45 microns or even below, ensuring a uniform coating with excellent adherence and mechanical properties.
2. Purity: Purity of tungsten carbide is crucial, typically above 98% W, with impurities like cobalt (Co), niobium (Nb), and titanium (Ti) kept to a minimum (<2%). This ensures maximum hardness and wear resistance.
3. Crystal Structure: WC powders usually exhibit a mixture of WC and WC-Co phases, which contributes to better wear resistance and toughness in the final coating.
4. Specific Surface Area: A higher specific surface area indicates more reactive sites for bonding during the thermal spraying process, leading to better adhesion and coating density. Values can range from 10-30 m²/g.
5. Shape: The powder should be spherical or near-spherical to ensure better flow and mixing during the spraying process. Irregular shapes may lead to poor coating quality.
6. Density: The theoretical density of WC is around 17.25 g/cm³, and the actual density after compaction should be close to this value for optimal performance.
7. Hardness: WC has a Vickers hardness of around 3000 HV, which makes it ideal for wear-resistant coatings.
8. Thermal Conductivity: High thermal conductivity helps dissipate heat during the spraying process, preventing overheating and maintaining the integrity of the coating.
9. Chemical Stability: Tungsten carbide is chemically inert under most conditions, making it suitable for corrosion-resistant applications.
These parameters can vary slightly depending on the manufacturer and specific application requirements. It's essential to consult the product specifications provided by the supplier for precise details.
(High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention)
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FAQ
Question: What are some common applications for High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention?
Answer: High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention are widely used in cutting tools, drilling tools, high-speed steel, carbide, electrode materials, lighting equipment, aerospace, nuclear industry and other fields.
Question: What is tungsten alloy?
Answer: Tungsten alloy is an alloy composed of tungsten as a base and other elements added. It has the characteristics of high density, high hardness, good corrosion resistance and thermal stability. It is often used to make radiation shielding materials, counterweights, etc.
Question: Why is tungsten filament used in light bulbs?
Answer: Tungsten wire has a high melting point and excellent electrical conductivity, and can maintain stable luminous performance at high temperatures, so it is often used to make filaments for incandescent light bulbs.
Question: What is the role of the tungsten electrode in TIG welding?
Answer: Tungsten electrode is used as an electrode in tungsten argon arc welding. It has high melting point, high thermal conductivity and high electron emission capability. It can stably generate arc and achieve high-quality welding.
Question: What is High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention? What are its uses?
Answer: High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention is a compound composed of tungsten and carbon and has extremely high hardness and wear resistance. It is commonly used in the manufacture of cutting tools, drill bits and wear-resistant parts.
Question: What are the applications of tungsten in aerospace?
Answer: Tungsten and its alloys are used in the aerospace field to manufacture rocket engine nozzles, missile structural components, etc. Because of their high temperature resistance and corrosion resistance, they can withstand extreme working environments.
Question: What is the mining and processing process for High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention?
Answer: Mining of High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention usually involves underground mining or open-pit mining. After the ore is crushed and ground, the tungsten is extracted through chemical or physical methods. The processing process includes steps such as smelting, powder preparation, molding and sintering.
Question: What impact does High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention have on the environment?
Answer: Waste water, waste gas and solid waste may be produced during the mining and processing of High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention, which will have a certain impact on the environment. Therefore, appropriate environmental protection measures need to be taken to reduce pollution.
Question: How to identify the authenticity of tungsten products?
Answer: The authenticity of tungsten products can be identified by observing the appearance of the product, measuring its physical properties (such as density, hardness), and conducting chemical composition analysis. It is recommended to choose formal channels and reputable brands when purchasing.
(High purity and ultra-fine tungsten carbide powder thermal spraying raw materials for wear resistance and corrosion prevention)
