Accession Number : AD0673211

Title :   HIGH-TEMPERATURE REFRACTORY MATERIALS BASED ON ZIRCONIA STABILIZED BY RARE-EARTH OXIDES (VYSOKOOGNEUPORNYE MATERIALY NA OSNOVE DVUOKISI TSIRKONIYA, STABILIZIROVANNOI OKISLAMI REDKOZEMELNYKH METALLOV),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Kind,N. E. ; Koshur,L. T.

Report Date : 13 SEP 1967

Pagination or Media Count : 12

Abstract : Zirconia specimens made with the addition of 11% (mol.) of CeO2 exhibit small thermal expansion and the high thermal stability. Increasing the amount of stabilizing cerium dioxide additive further, to 15 and 28% (mol.), lowers the thermal properties of the mixes. Yttrium oxide can also be used as a stabilizing additive to zirconium dioxide. Welts appeared on specimens made from these mixes after 11 heat cycles, and they failed at the 25th heat cycle. The highest thermal stability was found in those mixes in which the zirconium dioxide was represented after stabilization not only by the cubic, but also by the monoclinic modification. A secondary additive of monoclinic ZrO2 also improves the properties of specimens. A recipe and method for preparation of refractory products from zirconium dioxide are proposed. (Author)

Descriptors :   (*REFRACTORY MATERIALS, ZIRCONIUM OXIDES), (*ZIRCONIUM OXIDES, STABILIZATION), THERMAL STABILITY, ADDITIVES, RARE EARTH ELEMENTS, CERIUM COMPOUNDS, YTTRIUM COMPOUNDS, OXIDES, THERMAL EXPANSION, THERMAL STRESSES, USSR

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE