Metal-ceramic composite article and a method of producing the same
AssigneeNGK Insulators, Ltd.
InventorsNobuo Tsuno, Minoru Matsui
Life of this patent
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Abstract
A metal-ceramic composite article produced by fitting a projection formed on a ceramic member into a hole formed in a metallic member having a hardened region and an unhardened region on its surface such that the ceramic member is monolithically bonded to the metallic member and the deformed region of the metallic member resulting from the fitting is located within its unhardened range, has a high bonding force between the ceramic member and the metallic member and is adapted to be used in engine parts, such as turbocharger rotor, gas turbine rotor and the like, and other structural parts exposed to high temperature or to repeating loads, by utilizing the heat resistance, wear resistance and high strength of the ceramic.
Claims16
A metal-ceramic composite article, comprising a metallic member having a hole formed therein and a ceramic member including a projection, the projection of the ceramic member having been positioned within the hole of the metallic member through fitting, the improvement comprising the metallic member having a hardened region and an unhardened region on its surface, wherein the unhardened region is located on a portion of the metallic member which is deformed due to the fitting of the projection of the ceramic member into the hole of the metallic member.
A method of producing a metal-ceramic composite article comprising:
- forming a hole with an inner diameter in a metallic member;
- forming a projection with an outer diameter on a ceramic member;
- and
- surface hardening the metallic member at all portions except a portion wherein the inner diameter of the hole is less than the outer diameter of the ceramic member to be fitted therein, thereby forming a hardened surface region and an unhardened surface region and fitting the projection of the ceramic member into the hole of the metallic member, such that an increase in an outer diameter of the metallic member due to the fitting occurs within the unhardened surface region of the metallic member.
Dependencies are inferred from the claim text.