The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 07, 1989
Filed:
Jun. 03, 1988
Applicant:
Inventors:
Assignee:
NGK Spark Plug, Co., Ltd., Aichi, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
F01D / ;
U.S. Cl.
CPC ...
4162 / ;
Abstract
A turbine rotor having a ceramic turbine wheel having an improved resistance to cracking and breaking. The turbine wheel is made of a ceramic material having pores formed therein with a maximum diameter of 20 .mu.m distributed in the blade portion of the wheel at a porosity of 2 to 10 vol. %. Preferably, the volume porosity of the pores is gradually decreased from the blade surface to the interior of the blade portions.