March 7, 2000

A method for strengthening and aging-prevention of a TZP ceramics includes the steps of: introducing TZP ceramic and Si-based ceramic powders into a furnace in which a water vapor pressure is controlled; and exposing the TZP ceramic next to Si-based ceramic in a flowing H.sub.2 atmosphere containing H.sub.2 O of no more than 0.1%, to form a silica/zircon layer on the surface of the TZP ceramic.

4

March 7, 2000

09/234,927

January 22, 1999

427/255.21   427/255.27 427/255.36 427/255.4 427/377 427/399

C04B   41/45   (20060101)   C04B   41/87   (20060101)   C04B   41/50   (20060101)  

Apr 23, 1998 [KR] 98-14601

427/377   427/399   427/255.27   427/255.4   427/255.21   427/255.32   427/255.35   427/255.36