| 摘要 |
PURPOSE:To obtain superhard ceramics having high hardness, wear resistance, toughness and chipping resistance by blending specified percentages of TiC, ZrC, MgO, LiO, Nd2O3 and Al2O3. CONSTITUTION:This ceramics contains, by weight, 15-45%, in total, of titanium carbide and zirconium carbide in 1:(0.05-0.40) weight ratio, 0.1-1.0% magnesium oxide, 0.05-0.5% lithium oxide, 0.2-1.0% neodymium oxide and 52.5-84.65% alumina. In order to produce this ceramics, a starting material compsn. is preferably sintered by hot pressing. This hot pressing means may be direct hot isostatic pressing (HIP) and a hot pressing method. Hot pressing method is preferably adopted so as to make a hardly sinterable body dense and to effectively inhibit grain growth. |
