| 摘要 |
PURPOSE:To make improvements in the durability of engine parts bearing the above caption, by installing a jog part in the circumference of a zirconia sintered body, while forming an assembled body in a way of brazing a heat resisting metal ring having a specific coefficient of thermal expansion, and casting this assembled body for molding with an Al alloy. CONSTITUTION:A zirconia sintered body 2 having a jog part 2c on an outer circumference 2b is formed. And, this sintered body 2 is set up in a fitting hole of a heat resisting metal ring 3 via a soldering material 4 on the outer circumference 2b, then heated in a furnace of an inactive ambience for brazing, and an assembled body A is made up. This assembled body A is diecast with an Al alloy and thereby a piston is formed, or a concave part 1a being slightly smaller in its inner diameter than an outer diameter of the heat resisting metal ring is installed in a pre-diecast piston body whereby the assembled body A is fitly attached by means of shrinkage fit otherwise. At this time, a coefficient of thermal expansion in the heat resisting metal ring 3 is set to a range of 10-24X 10<-6>/ deg.C, and in this case it is desirable that stainless steel, cast iron, etc., be used, by way of example. |
