发明名称 |
BORON CARBIDE BASED SINTERED COMPACT AND METHOD FOR PREPARATION THEREOF |
摘要 |
A boron carbide based sintered body having a four-point flexural strength of at least 400 MPa and a fracture toughness of at least 2.8 MPa.m<1/2>, which has the following two preferred embodiments. (1) A boron carbide-titanium diboride sintered body obtained by sintering a mixed powder of a B4C powder, a TiO2 powder and a C powder while reacting them under a pressurized condition and comprising from 95 to 70 mol% of boron carbide and from 5 to 30 mol% of titanium diboride, wherein the boron carbide has a maximum particle diameter of at most 5 mu m. (2) A boron carbide-chromium diboride sintered body containing from 10 to 25 mol% of CrB2 in B4C, wherein the sintered body has a relative density of at least 90%, boron carbide particles in the sintered body have a maximum particle diameter of at most 100 mu m, and the abundance ratio (area ratio) of boron carbide particles of from 10 to 100 mu m to boron carbide particles having a particle diameter of at most 5 mu m, is from 0.02 to 0.6.
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申请公布号 |
EP1452509(A1) |
申请公布日期 |
2004.09.01 |
申请号 |
EP20020780026 |
申请日期 |
2002.11.06 |
申请人 |
NATIONAL INSTITUTE OF ADVANCED INDUSTRIAL SCIENCE AND TECHNOLOGY;DENKI KAGAKU KOGYO KABUSHIKI KAISHA |
发明人 |
HIRAO, KIYOSHI;SAKAGUCHI, SHUJI;YAMAUCHI, Y.;KANZAKI, SHUZO;YAMADA, SUZUYA |
分类号 |
C04B35/563;(IPC1-7):C04B35/56;B23B27/14 |
主分类号 |
C04B35/563 |
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