INNER CYLINDER AND PLUNGER FOR INJECTION PUMP, AND HOT CHAMBER DIE-CASTING MACHINE

文件类型：PDF文档
文件大小：159K
PROBLEM TO BE SOLVED : To provide an inner cylinder for an injection pump, which has sufficiently high wear-resistance to molten metal, and to provide a hot chamber die-casting machine. SOLUTION : The hot chamber die-casting machine is equipped with an inner cylinder 2c for an injection pump, whose inner side is made of a silicon nitride sintered compact. The silicon nitride sintered compact comprises a main phase consisting of β-sialon, and a grain boundary phase contained in the amount of 4-10 vol% relative to the silicon nitride sintered compact. The β-sialon is expressed by the composition formula of Si6-zAlzOzN8-z (z=0.1-1). The grain boundary phase comprises RE-Al-Si-O-N (RE is a group III element in the periodic table), in which the constituent ratio of Al, Si, and RE is, in terms of Al2O3, SiO2, and RE2O3 respectively, as follows : 5-50 mass% Al2O3, 5-20 mass% SiO2, and the balance RE2O3 with N. Since the inner cylinder 2c has improved wear resistance and hardly wears even if continuously used for a long period of time, the frequency of exchanging the inner cylinder 2c is lowered so that high reliability is obtained. COPYRIGHT : (C)2008, JPO&INPIT