On the market, we are more familiar with special ceramic materials: silicon carbide, alumina, zirconia, silicon nitride. Comprehensive market demand, analyze the advantage of these several kinds of materials.
Silicon carbide has the advantages of relatively cheap price, good erosion resistance, high strength, the biggest disadvantage is easy to oxidize, it is difficult to sintering. Alumina is the cheapest, and the preparation process of powder raw materials is very mature, while zirconia and silicon nitrous oxide have obvious disadvantages in this respect, which is also one of the bottlenecks restricting the development of the latter two. Silicon nitride, in particular, is the most expensive.
In terms of performance, although the strength, toughness and other mechanical properties of silicon nitride and zirconia are far better than alumina, it seems that the cost performance is appropriate, but in fact there are many problems. First from zirconia, it has high toughness, the reason is the existence of stabilizer, but its high toughness is time-sensitive, can not be used at high temperature and room temperature time-sensitive seriously restrict the wrong development of oxidation, it should be said that it is the smallest of the three in the market. And silicon nitride, is also a popular ceramic in the past twenty years, wear-resistant thermal shock strength and other comprehensive performance is good, but the use of temperature is lower than the other two; The preparation process of silicon nitride is also more complex than alumina, although the application of silicon nitride phase is much better than zirconia, but overall comparison is still not as good as alumina.
Inexpensive, stable performance, product diversification of alumina ceramics became the earliest use, and has been used to the present special ceramics.
Post time: Jan-22-2022