Silicon Nitride Ceramic Parts
Aluminum oxide ceramics, silicon nitride ceramics, zirconia ceramics
Silicon nitride ceramics have the characteristics of anti-corrosion of molten aluminum, so that they can be used to make temperature-measuring thermocouple sleeves, linings of aluminum smelting furnaces, linings of molten aluminum buns, Crucibles, cast aluminum molds, aluminum electrolytic cells and other appliances. For example, the technology of thermocouple sleeves made of silicon nitride ceramics for temperature measurement of molten aluminum has begun to be popularized in my country. Compared with commonly used stainless steel and corundum ceramic sleeves, this type of sleeve has better performance. After all, stainless steel It is easily corroded by molten aluminum and will be damaged after 20 hours of continuous use, and corundum cannot withstand thermal shock. The silicon nitride ceramic sleeve, which has long-term stable performance in molten aluminum and does not crack after more than 1,200 intermittent temperature measurements, is a powerful tool in the processing process.
Silicon nitride ceramic parts are precision ceramic products sintered at high temperature in a non-oxidizing environment. They have the characteristics of acid and alkali resistance and corrosion resistance. It is used in the environment with high pollution of non-lubricating medium. At 800°C, the strength and hardness of silicon nitride ceramic balls are almost unchanged, the density is 3.20g/cm3, the weight is almost 1/3 of the weight of bearing steel, and the centrifugal force is small during rotation. High-speed operation can be realized. Therefore, silicon nitride ceramic balls can largely become the ball of choice for ceramic bearings and hybrid ceramic bearings, and also play an important role in the field of ultra-fine grinding.
The silicon nitride sealing ring is an inorganic non-metallic material, and the overall color is black gray /gray. Silicon nitride has high hardness, especially hot-pressed silicon nitride, which is one of the hardest substances in the world. With self-lubricating properties, it can be used in environments with high pollution of non-lubricating media. It becomes the material of ceramic bearings and hybrid ceramic ball bearings. Zirconia ceramic balls have high strength and high toughness at room temperature, good wear resistance, high temperature resistance and corrosion resistance, high rigidity, non-magnetic conductivity, and electrical insulation. Zirconia ceramic balls have almost no change in strength and hardness at 600°C. The density is 6.00g/cm3, and the thermal expansion rate is close to that of metals, so they can be used in conjunction with metals.