Accession Number : AD0721667

Title :   Thermal-Shock-Resistant Materials.

Descriptive Note : Rept. for Jul 61-Jun 70,

Corporate Author : AEROSPACE CORP EL SEGUNDO CALIF LAB OPERATIONS

Personal Author(s) : Rossi,Ronald C.

Report Date : 15 FEB 1971

Pagination or Media Count : 38

Abstract : Aerospace applications that take advantage of the refractory nature of ceramic materials also impose upon these materials severe conditions of thermal shock. The severity of this thermal environment is so great that prevention of crack nucleation is not possible. Therefore, thermal-shock-resistant materials for severe environments are designed to prevent crack propagation. These materials can sustain thermal strains without generating the thermal stresses that otherwise would lead to catastrophic failure. The thermal-shock-resistant materials that have been developed are composite materials with either carbide or oxide matrices. Thermal simulation tests have revealed that these materials have resistances to thermal shock far superior to those of more conventional ceramic materials. The ability to withstand such severe thermal conditions can be attributed to the behavior of the individual phases within the microstructures. (Author)

Descriptors :   (*REFRACTORY MATERIALS, SHOCK RESISTANCE), (*COMPOSITE MATERIALS, SHOCK RESISTANCE), CRACK PROPAGATION, THERMAL SHOCK, TEST METHODS, MICROSTRUCTURE, GRAPHITE, CARBIDES, ZIRCONIUM COMPOUNDS, HAFNIUM COMPOUNDS, TUNGSTEN, BERYLLIUM OXIDES, NITRIDES, BORON COMPOUNDS, MAGNESIUM OXIDES

Subject Categories : Ceramics, Refractories and Glass
      Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE