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公开(公告)号：KR100270604B1
公开(公告)日：2000-11-01
申请号：KR1019970074899
申请日：1997-12-27
Applicant: 국방과학연구소
IPC: C04B35/48
Abstract: PURPOSE: A method is provided to control the microstructure that is shown in a silicon nitride based sintered compact having a high toughness so as to solve problems such as high costs and limited application fields in manufacturing the silicon nitride based sintered compact having a high toughness. CONSTITUTION: The method for controlling the microstructure of a silicon nitride based sintered compact comprises the processes of obtaining initial raw material powder of Si3N4 having an average particle size of 0.5 microns or less; mixing the initial raw material powder with sintered materials including AlN, Y2O3 and Al2O3 in case of SiAlON sintered compact and Y2O3 and Al2O3 in case of Si3N4 sintered compact, and compression molding the mixture; and atmospheric sintering the obtained compressed powder at a temperature of 1850 deg.C or less so that the microstructure of the obtained sintered compact has a dual structure which is changed depending on the atmospheric sintering time, wherein the initial raw material powder of Si3N4 having an average particle size of 0.5 microns or less is obtained through precipitation or centrifuge method.
Abstract translation: 目的：提供一种控制在具有高韧性的氮化硅基烧结体中显示的微结构的方法，以解决制造具有高韧性的氮化硅基烧结体的成本高和应用领域有限的问题。 构成：用于控制氮化硅基烧结体的微结构的方法包括获得平均粒径为0.5微米或更小的Si 3 N 4的初始原料粉末的方法; 在SiAlON烧结体的情况下将初始原料粉末与AlN，Y2O3和Al2O3等烧结材料混合，在Si3N4烧结体的情况下将Y2O3和Al2O3混合，并将其混合; 并在1850℃或更低的温度下大气烧结获得的压缩粉末，使得所获得的烧结体的微观组织具有根据大气烧结时间而改变的双重结构，其中，具有Si3N4的初始原料粉末 通过沉淀或离心法获得0.5微米或更小的平均粒径。
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公开(公告)号：KR1019990054996A
公开(公告)日：1999-07-15
申请号：KR1019970074899
申请日：1997-12-27
Applicant: 국방과학연구소
IPC: C04B35/48
Abstract: 본 발명에서는 고인성의 질화규소를 제조하는데 있어 고비용 문제와 제한된 응용 분야의 확대를 위하여, 입자 분리법을 통하여 입자 크기가 0.5 ㎛ 이하인 Si
3 N
4 초기 원료 분말을 얻고, 상기 초기 원료 분말 및 소결조제를 혼합하고, 압축 성형한 후, 얻어진 압분체를 1850 ℃ 이하의 온도에서 상압 소결함으로써 얻어진 소결체의 미세조직이 이중 구조를 갖도록 하는 질화규소 소결체의 미세 조직 제어 방법을 제공한다.
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