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近来,有在高温耐热材料陶瓷中添加碳化硅(SiC)、氮化硅(Si_3N_4)和氮化铝(AlN)等化合物的阀瓷.其中,以氮化硅的高温耐热性、化学稳定性和热冲击性好:因此目前英、美、日本等国都试图以它做切削刀具.用它切削铸铁比Al_2O_3系陶瓷刀具的切削性能提高几倍.氮化硅烧结体的制造方法是在氨气或氮气中加热:让氮气和硅元素进行反虚而成.左表所列为氮化硅的特性。这种材料适用于做耐高温夹具、各种滑动部件、耐磨零件、熔化金属用坩埚和切削刀具材料等.氮化硅切削刀具的磨损曲线如下图所示.由图中看出,实际切削时间为20分钟时,Al_2O_3系冷压陶瓷刀片后面磨损宽度为0.59毫米:炭化物系热压陶瓷刀片为0.42毫米:而Si_3N_4刀具为0.23毫米.可见其耐热性和耐磨性是好的.
Recently, there are valve ceramics in which compounds such as silicon carbide (SiC), silicon nitride (Si_3N_4), and aluminum nitride (AlN) are added to high-temperature heat-resistant material ceramics in which high temperature heat resistance and chemical stability of silicon nitride Good thermal and sexual properties: At present, Britain, the United States, Japan and other countries are trying to make it as a cutting tool.It uses cutting iron than the Al_2O_3 series ceramic cutting tool cutting performance several times.Nitride sintered body manufacturing method is ammonia Heating in gas or nitrogen: Nitrogen and silicon are inverted. The table below lists the properties of silicon nitride. This material is suitable for high temperature fixture, a variety of sliding parts, wear parts, crucible melting metal and cutting tool materials, etc .. Silicon nitride cutting tool wear curve as shown below, the figure shows that the actual cutting When the time is 20 minutes, the wear width of the back of the Al 2 O 3 -based cold-pressed ceramic blade is 0.59 mm: 0.42 mm for the ceramic-based hot-pressed ceramic blade and 0.23 mm for the Si_3N_4 tool.