Silicon Nitride Ceramic Tubes

Semicorex Silicon Nitride Ceramic Tubes possess high strength, high hardness, and high temperature resistance, with a hardness reaching HRA91~93. They exhibit good hot hardness, withstanding temperatures of 1300~1400℃. Their low chemical reaction with carbon and metallic elements results in a low coefficient of friction. They are self-lubricating, thus resistant to wear. They have strong corrosion resistance, reacting only with hydrofluoric acid and other inorganic acids, and also exhibit oxidation resistance at high temperatures. Furthermore, they have excellent thermal shock resistance, remaining intact even after rapid cooling and reheating in air. Silicon nitride ceramics exhibit low high-temperature creep, resulting in minimal slow plastic deformation under high temperatures and fixed loads.

In low-pressure casting machines, the riser pipe is a crucial component, directly impacting casting quality and production efficiency. During operation, the riser pipe is installed on the machine, its lower end inserted into the alloy melting device. Molten aluminum alloy at approximately 700℃ is drawn from the bottom up through the melting device for casting components such as automotive wheel hubs and engine cylinder heads.

During continuous production, the riser pipe is repeatedly subjected to impacts from fluctuating air pressure and the thermal shock of the molten metal flowing up and down. It must be leak-proof, and prolonged immersion and scouring at high temperatures must not cause significant corrosion or spalling. Therefore, to withstand such harsh conditions, the riser pipe must possess excellent resistance to corrosion from molten aluminum alloy, good thermal shock resistance, good airtightness, and resistance to thermal shock fatigue.

Silicon Nitride Ceramic Tubes also possess advantages such as high specific strength, high specific modulus, high thermal conductivity, and excellent electrical properties. Therefore, they have special application value in extreme environments such as high temperature, high speed, and strong corrosive media. They are hailed as the class with the best comprehensive performance in the structural ceramics family, and naturally become the ideal material for preparing riser tubes.

Silicon Nitride Ceramic Tubes Performance:

1. High temperature resistance, corrosion resistance, and non-wetting with molten aluminum and other non-ferrous metals;

2. Low coefficient of thermal expansion and excellent thermal conductivity;

3. Excellent thermal shock resistance and strong thermal shock resistance, preventing cracking;

4. Oxidation resistant and long service life.