Abstract
This paper summarizes the current developments of PM (powder metallurgy) valve seat insert materials for high performance engines. Using a transient liquid phase sintering process in a vacuum furnace, the new PM HSS (high speed steel) -based exhaust valve seat insert material SGQ 123 is developed. The simulation testing under several high temperatures. pressures and burning atmospheres and 1000 h durability engine test of the exhaust valve seat inserts made of the new PM HSS-based material were done and compared with foreign PM parts.
The results show that the new PM HSS-based material SGQ 123 has an advanced combination of properties and high temperature temper resistant behaviour. The wear resistance of the new material is two to three times as high as that of foreign PM parts and the cost price of the new material is only one third that of foreign PM parts. It indicates that the new PM HSS-based material is a potential material for the exhaust valve seat insert in diesel engines.