青青草欧美亚洲日本,日韩人妻中文字幕有码,日韩外围三级在线观看,国产av国,亚洲天堂网中字成人区,久操国产在线资源,欧洲亚洲天堂精品好看,伊人a视频,欧美有码一区二区

                

 
■Formula for the silicon nitride Si3N4, is an important structural ceramic material. 

■It is a super-hard material ,lubricity and anti-abrasive.

■In addition to hydrofluoric acid, it does not react with other inorganic acids. 

■And it also resistant to cold shock, even heated to above 1000 ℃ and cooled rapidly,but it will not shatter. 

■Coating to protect the quartz crucible at a high temperature for the isolation between.quartz crucible and silicon.Liquid silicon can not be reacted with the quartz to ensure the integrity of silicon ingot.
 




■Technique Specification:
 

 
Typical Customer: 

American,Europe and Asia and so on.