公开(公告)号：WO1985001936A1

公开(公告)日：1985-05-09

申请号：PCT/US1984001736

申请日：1984-10-26

Applicant: THE BOARD OF REGENTS ACTING FOR AND ON BEHALF OF ...

Inventor： THE BOARD OF REGENTS ACTING FOR AND ON BEHALF OF ... ,  TIEN, Tseng-Ying

IPC: C04B35/48

CPC classification number: C04B35/645 ,  C04B35/10 ,  C04B35/119 ,  C04B35/185 ,  F02B3/06

Abstract: Novel transformation toughened ceramic compositions comprising finely divided ZrO2-HfO2 solid solution particles dispersed in a Al2O3-Cr2O3 (alumina) or 3Al2O3 . 2SiO2-3Cr2O3 . 2SiO2 (mullite) solid solution matrix phase. It is found that increased hardness and modulus associated with higher relative Cr2O3 content (e.g. 20 mole %) in the matrix phase and increased fracture toughness associated with higher relative HfO2 content (e.g. 10 to 20 mole %) in the disperse phase represent viable and improved ceramic compositions. Such transformation toughened ceramic compsitions are considered useful in superhot light diesel engine applications, high temperature gas turbines and ultrahigh temperature ceramic heat exchangers.