Performance Comparison Of Silicon Carbide Ceramics And Alumina Ceramics

Silicon carbide ceramics not only have excellent room temperature mechanical properties, such as high flexural strength, excellent oxidation resistance, good corrosion resistance, high wear resistance and low friction coefficient, but also high temperature mechanical properties (strength, creep resistance properties, etc.) is the best among known ceramic materials. Materials that are hot-pressed sintering, pressureless sintering, and hot isostatic pressing. The biggest feature of silicon carbide is its high high-temperature strength. The strength of ordinary ceramic materials will be significantly reduced at 1200 ~ 1400 degrees Celsius, while silicon carbide is resistant to bending at 1400 degrees Celsius. The strength is still maintained at a high level of 500 ~ 600MPa, so its working temperature can reach 1600 degrees Celsius; the silicon carbide plate is hard and brittle, has a small expansion coefficient, can withstand rapid cooling and heating, and is not easily deformed. Silicon carbide has the smallest density, so ceramic parts made of silicon carbide are the lightest.
Alumina ceramic is a ceramic material based on aluminum oxide (Al2O3) and is used in thick film integrated circuits. Alumina ceramics have good conductivity, mechanical strength and high temperature resistance. It should be noted that ultrasonic cleaning is required. Its wear resistance is equivalent to 266 times that of manganese steel and 171.5 times that of high chromium cast iron. Alumina ceramic is a high-quality insulating material that is often used to make ceramic insulating sheets, insulating rings and other parts. Alumina ceramics can withstand high temperatures up to 1750°C (alumina content is over 99%).