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National Symposium on Preparation of Nitride Powders and Ceramics in 2019

Issuing time:2019-08-18 15:53

The nitride ceramic mainly refers to a ceramic in which a refractory compound in which nitrogen is combined with a nonmetal or a metal element by a covalent bond. Widely used are silicon nitride (Si3N4), boron nitride (BN), aluminum nitride (AlN), etc., nitride ceramics rely on their unique mechanical properties, chemical properties, electrical properties, in advanced functional ceramics and structural ceramics The field has broad market prospects.

Focus of attention 1. Silicon nitride powder and ceramic high-quality powder are important guarantees for the manufacture of high-performance ceramics. As a powder for preparing high-performance silicon nitride materials, it must have: narrow particle size distribution, iron, aluminum and other metals. Low impurity content and low oxygen content. Silicon nitride ceramics have low thermal expansion coefficient, high strength, high hardness, self-lubricity, chemical abrasion resistance and good thermal shock resistance and mechanical impact resistance. They are currently used in ceramic engines, bearings, circuit boards, etc. The scientific community considers it to be a new material with excellent comprehensive performance and the most promising alternative to nickel-based alloys in the field of structural ceramics, which is widely used in high-tech and high-temperature fields. In addition, silicon nitride ceramics have high hardness and a small friction coefficient of only 0.1 to 0.2. They are self-lubricating and can be used without lubricants. They are the first materials for wind power bearings.

Focus of attention 2, boron nitride powder and ceramics Common boron nitride powders include hexagonal boron nitride and cubic boron nitride. Among them, hexagonal boron nitride, also known as graphite type boron nitride, is a soft, white crystalline powder, commonly known as white graphite. Hexagonal boron nitride can be used as insulation material, refractory material, niobium and high temperature lubricant. Cubic boron nitride, also known as diamond-type boron nitride, can be converted into cubic boron nitride by hexagonal boron nitride at high temperature and high pressure, and can be used as a high-temperature abrasive and polishing agent.

Focus 3: Aluminum nitride powder and ceramic aluminum nitride (AlN) is a kind of diamond-like nitride inorganic non-metallic material with good thermal conductivity and small thermal expansion coefficient. It is a good thermal shock resistant material; resistant to molten metal corrosion. It has strong ability and is ideal for casting pure iron, aluminum or aluminum alloy. Aluminum nitride is also an electrical insulator with good dielectric properties. It also has a good application prospect in the field of electrical component manufacturing. Ultrafine aluminum nitride powder is widely used in the field of large scale integrated circuit production. Focus on four, other nitride powders and ceramics In addition to the above widely used nitride materials, there are transition metal nitrides such as titanium nitride, molybdenum nitride and tungsten nitride, as well as raw materials Si3N4, Al2O3, AlN, Y2O3 And other metal oxide synthesis of Cylon ceramics. Sialon Ceramics has been used in wear parts and tool materials such as engine parts, bearings and seals, and has also been used in alloying, rolling and casting of copper and aluminum alloys.

[Meeting time] September 16-18, 2019

[Meeting Place] At the top of the form, Xi'an Zhongxing Hetai Hotel, Shaanxi (No. 10, Tangyan South Road, High-tech Zone)

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