A :
1) Some of the advanced ceramic materials commonly used in industry do not exist in nature (such as silicon nitride, aluminum nitride ceramics), which are manufactured by chemical combination;
2) The manufactured powder should be purified for many times, and the purity of the powder is very high. Many requirements of alumina ceramics are more than 95%, and some requirements are more than 99%, or higher;
3) The ratio of product requirements is precise and strict. Although the purity of many ceramic products does not reach 99%, they use more than 99% powder to add the formula powder which is convenient for sintering, so that the sintered ceramic products have better performance.
4) Fine powder requirements, zirconia powder in about 0.0005 mm, daily ceramics in 1-2 mm on the line;
5) High sintering temperature, alumina ceramic sintering temperature at about 1600 degrees, high temperature resistant materials and heating body of the furnace requirements, electricity and gas energy consumption is high;
6)Precision ceramics are also used in the case of metal and plastic can't be competet from aerospace mltay dvelopment to idusrial use, istt high grade matrial the price is much hgher than odinany metal. At present, the aplicacion of advanced ceramic products is not to etensve not many people know. The more widely used, the larger the scale of production and the more sophisticated the technology.
7) Precision machining process, to use diamond abrasive tools and precision machine tools, ceramic hardness is high, slow processing;
8)From powder mixing, mold making, molding, snering, prcesins to the production of fnished products, many pocessess long production time,is also the main reason for high prices.