| 摘要 |
PURPOSE:To extend the life of a printing pin and to perform high speed printing, by constituting the printing pin of a zirconia base composite sintered body consisting of alumina or titanium carbide and yttria-containing partially stabilized zirconia. CONSTITUTION:A printing pin for a dot printer composed of a high toughness, high strength and high hardness zirconia base composite sintered body obtained by compounding a hard phase composed of alumina or titanium carbide with zirconia consists of 5-40vol.% of alumina or titanium carbide having an average particle size of 10mum or less and the remainder of partially stabilized zirconia substantially containing 1-5mol.% of yttria. When the particle size of the hard phase composed of alumina or titanium carbide exceeds 10mum, the hard phase itself acts as a flaw to lower strength and, therefore, said particle size is set to 10mum or less and the quantity thereof is set to 5-40% in order to achieve a role as the hard phase without lowering toughness and strength since hardness is insufficient when the quantity is below 5% and toughness and strength are lowered when exceeds 40%. |
