Development and application of silicon carbide ceramics(一)

16-11-2020

The difference between silicon carbide ceramics and many ceramics is that it can conduct electricity at room temperature and is resistant to high temperatures. It is a good heating element. Electric heating rods made of silicon carbide are called silicon carbide rods, which can withstand high temperatures of 1450°C in the air; silicon carbide rods made of good quality recrystallization can even withstand high temperatures of 1600°C, much higher than metal heating elements (except Platinum, rhodium and other precious metals), this is because it will oxidize in high-temperature air to form a dense silicon oxide film, which acts as a barrier to the air and greatly slows down the further oxidation of the inner silicon carbide, so that it can Work at high temperatures. High-density silicon carbide ceramics close to the theoretical density can be prepared by hot pressing, and its bending strength can reach 500-600 MPa even at a high temperature of about 1400°C. The strength of other ceramic materials will drop sharply after 1200silicon carbide ceramics°C. Therefore, silicon carbide is the strongest material in high-temperature air.

silicon carbide rods

To improve the efficiency of high-temperature gas turbine engines, it is necessary to increase the operating temperature. The key to solving the problem is to find structural materials that can withstand high temperatures, especially the blade materials inside the engine. Silicon carbide ceramic has sufficient strength at high temperatures, and has good oxidation resistance and thermal shock resistance. These excellent qualities make it extremely suitable for use as high-temperature structural materials. Many scientists consider it and silicon nitride ceramics to be the most promising candidate materials for high-temperature gas turbine engine blades operating at 1200-1400°C.


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