Turbine rotor
AssigneeNgk Spark Plug Co., Ltd.
InventorsMasaya Ito, Noboru Ishida, Mitsuyoshi Kawamura
Life of this patent
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Abstract
In a turbine rotor composed of a ceramic turbine blade and a metal shaft with an end to be machined, martensite stainless steel or martensite heat-resistant steel which can be hardened in a gas or vacuum after having been heated beyond the quenching temperature thereof is used as the metal. The ceramic blade and the metal shaft are heat-connected by brazing or shrinkage fit at 800.degree. C., or more. The metal shaft hardened through the heat-connection is tempered only at the end to be machined or the metal shaft heated to the quenching temperature is quench hardened only in part other than the end to be machined, thus facilitating the machining of the metal shaft locally which keeping the remaining part thereof in a quench hardened condition.
Claims12
A turbine rotor including a ceramic member and a metal shaft member with an end to be machined, wherein the metal member is made of any one of martensite heat-resistant steel and martensite stainless steel which is quench hardened in a gas or vacuum after having been heated beyond a quench hardening temperature thereof to heat-connect the metal shaft member with the ceramic member, the metal shaft member quench hardened when heat-connected with the ceramic member having been tempered only at the end to be machined while keeping part of the metal shaft member other than the end to be machined in a hardened state.
A turbine rotor including a ceramic member and a metal shft member with an end to be machined, wherein the metal member is made of any one of martensite heat-resistant steel and martensite stainless steel which is quench hardened in a gas or vacuum after having been heated beyond a quench hardening temperature thereof to heat-connect the metal shaft member with the ceramic member, the metal shaft member having been quench hardened when heat-connected with the ceramic member only in part of the metal shaft member other than the end to be machined without hardening the end to be machined.
Dependencies are inferred from the claim text.