公开(公告)号：WO1997048659A1

公开(公告)日：1997-12-24

申请号：PCT/US1997009475

申请日：1997-06-02

Applicant: THE DOW CHEMICAL COMPANY

Inventor： THE DOW CHEMICAL COMPANY ,  HWANG, Chinmau, James ,  FULLER, Sharon, M.

IPC: C04B35/597

CPC classification number: C04B35/597 ,  C04B35/6455 ,  C04B2235/3201 ,  C04B2235/3203 ,  C04B2235/3206 ,  C04B2235/3208 ,  C04B2235/3213 ,  C04B2235/3224 ,  C04B2235/3225 ,  C04B2235/3244 ,  C04B2235/3251 ,  C04B2235/3286 ,  C04B2235/3826 ,  C04B2235/3852 ,  C04B2235/3865 ,  C04B2235/3873 ,  C04B2235/3886 ,  C04B2235/6586 ,  C04B2235/668 ,  C04B2235/766 ,  C04B2235/767 ,  C04B2235/77 ,  C04B2235/80 ,  C04B2235/96

Abstract: A sinterable material for forming SiAlON ceramic material. The sinterable material is a powder mixture containing six elements: (a) silicon nitride, (b) aluminum nitride, (c) an oxide or nitride of a rare earth element, (d) an oxide or nitride of strontium, (e) an oxide or nitride of calcium, magnesium, lithium, or sodium, and (f) a non-alloying additive which is an oxide or nitride of zirconium, tantalum, gallium, hafnium, or indium, the non-alloying additive being present in an amount of at least about 0.3 weight percent based on the weight of the powder mixture. The sinterable material can be made into a ceramic body using a method of the present invention. The method includes three steps: making the powder mixture, forming the powder mixture into a greenware body, and sintering the greenware body at an elevated temperature to form the SiAlON ceramic body. The SiAlON ceramic body of the present invention contains a ceramic material which incorporates the non-alloying additive within the material at a level of at least about 0.3 weight percent. The ceramic body has at least an alpha-SiAlON phase and a beta-SiAlON phase which define an alpha-to-beta weight ratio. The alpha-to-beta weight ratio is in the range of from about 10:90 to about 90:10. Silicon carbide particulates can be incorporated into the powder mixture. Low-pressure or pressureless sintering can be used.

Abstract translation: 用于形成SiAlON陶瓷材料的可烧结材料。 可烧结材料是含有六种元素的粉末混合物：（a）氮化硅，（b）氮化铝，（c）稀土元素的氧化物或氮化物，（d）锶的氧化物或氮化物，（e） 钙，镁，锂或钠的氧化物或氮化物，以及（f）作为锆，钽，镓，铪或铟的氧化物或氮化物的非合金化添加剂，非合金化添加剂以量 至少约0.3重量％，基于粉末混合物的重量。 可烧结材料可以使用本发明的方法制成陶瓷体。 该方法包括三个步骤：制备粉末混合物，将粉末混合物形成一个绿色软体，并在高温下烧结绿色软体，形成SiAlON陶瓷体。 本发明的SiAlON陶瓷体包含一种陶瓷材料，该陶瓷材料以至少约0.3重量％的水平在该材料内掺入非合金添加剂。 陶瓷体至少具有α-SiAlON相和β-SiAlON相，其定义α-β重量比。 α-β重量比在约10:90至约90:10的范围内。 可以将碳化硅微粒掺入到粉末混合物中。 可以使用低压或无压烧结。