| 摘要 |
PURPOSE:To render high deflective strength and fracture toughness to an alumina sintered body without deteriorating the high wear resistance by forming the sintered body with pure alumina. CONSTITUTION:This alumina sintered body for a tool such as a cutting tool, a wear or corrosion resistant tool is made of alumina of 99.7-99.99% purity and has 0.5-2mum grain size, >=3.95g/cm<2> density, 1,850-2,000kgf/mm<2> Vickers hardness under 10kg load, >=100MPa deflective strength, 2.9-3.5MPa.m<1/2> fracture toughness (K1c), 30-40W/m.K heat conductivity at 25 deg.C and >=30% light transmittance at the time of 1mm thickness. Since this sintered body transmits light, internal defects as well as surface defects can be discriminated and cracks generated during working can easily be detected. |
