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日本大沢恂等人提出两种粉末冶金阀座材料的成份如下: 1.Mo:2～15%,C:0.1～2%,以B_2O_3、P_2O_5、PbO、ZnO、Al_2O_5为主要成份的低融点玻璃:0.5～5%,余为铁组成的内燃机用阀座材料。2.Mo:2～15%,C:0.1～2%,Pb:2～20%,以B_2O_5、P_2O_5、PbO、ZnO、Al_2O_5为主要成份的低融点玻璃:0.5～5%,余为铁的内燃机用阀座材料。以前,阀座一般是使用铸铁、低合金铸铁、Cr合金、不锈钢等制造的。但这些材料在无铅化汽油情况
Nippon Yukawa proposed two kinds of powder metallurgy valve seat material composition as follows: 1.Mo: 2 ~ 15%, C: 0.1 ~ 2%, with B_2O_3, P_2O_5, PbO, ZnO, Al_2O_5 as the main component of the low melting point glass : 0.5 ~ 5%, the remainder is composed of iron for the internal combustion engine seat material. 2.Mo: 2 ~ 15%, C: 0.1 ~ 2%, Pb: 2 ~ 20%, B_2O_5, P_2O_5, PbO, ZnO, Al_2O_5 as the main component of low melting point glass: 0.5 ~ 5% Internal combustion engine seat material. In the past, the valve seat was generally made of cast iron, low alloy cast iron, Cr alloy, stainless steel and the like. But these materials are in the case of lead-free petrol