| 摘要 |
PURPOSE:To obtain a fine substrate which is mechanically strong and excellent in machining by adding specific quantity of a reducing oxide in a composition consisting of TiC-Al2O3. CONSTITUTION:A material consisting of 70-98% of the total weight TiC and Al2O3 and 30-2% of the total weight reducing oxide and the content of TiC being 5-50% of the total weight is used. If the content of TiC and AlO3 exceeds 98% of the total weight, the sintering temperature rises and cannot be sintered under a temperature of 1,700 deg.C and if the content is 70% or less of the total weight, the phases of TiC and Al2O3 are reduced and the Vickers hardness is lowered. If the content is 5% or less of the total weight, the resistance against abrasion is reduced. If the weight of the reducing oxide exceeds 30% of the total weight, rich phases of TiC and Al2O3 rapidly grow into grains and if the content is 2% or less of the total weight, holes increase rapidly. |
