| 摘要 |
PURPOSE:To obtain the subject sintered body having high strength and reduced electric specific resistance and easily undergoing electric spark machining by blending SiC powder with specified amts. of TiB2 powder and Al2O3 powder and sintering the blend in an inert gaseous atmosphere. CONSTITUTION:25-60 pts.wt. SiC powder is blended with 30-70 pts.wt. TiB2 powder and 3-15 pts.wt. Al2O3 powder or a precursor giving 3-15 pts.wt. Al2O3, e.g., aluminum alkoxide, and <=4 pts.wt. C, e.g., phenol resin convertible into carbide giving <=4 pts.wt. C is further added to the blend as required. The blend is then sintered at 1,700-2,000 deg.C in an inert gaseous atmosphere to obtain the title sintered body having >=500 MPa bending strength and <=10<-2>OMEGAcm electric specific resistance. |
