Accession Number : AD0673227

Title :   LARGER-DIMENSIONED ZIRCONIUM DIOXIDE ARTICLES WITH ELEVATED THERMAL STABILITY (BOLSHEMERNYE IZDELIYA POVYSHENNOI TERMICHESKOI STOIKOSTI IZ DVUOKISI TSIRKONIYA),

Corporate Author : FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s) : Margulis,O. M. ; Usatikov,I. F. ; Kamenetskii,A. B.

Report Date : 13 SEP 1967

Pagination or Media Count : 13

Abstract : It was previously established that the thermal stability of refractory materials made of zirconium dioxide increased if certain amounts of isometric and monoclinic ZrO2 were melted and mixed together. The present work was carried out in order to determine the optimal quantities of the monoclinal part and the optimal grain sizes of both parts. The experiments showed that: (1) thermal stability of large items of zirconium dioxide increased with the use of 0 to 60 micron fraction of isometric ZrO2; (2) the monoclinic zirconium (introduced in insignificant quantities) gave best results when its grain sizes were smaller than 2 microns but even with 60-micron grains its thermal stability and the deformation temperature under load remained satisfactory; (3) 15% of coarse monoclinic zirconium gave the best results (the increase of its content from 15 to 25% lowered the strength of the material at room temperature); (4) thermal stability of large items made of zirconium dioxide was affected by the shape and the size of the item; (5) the introduction of the monclinic zirconium considerably increased the thermal stability of large items in comparison to those made only of isometric ZrO2. (Author)

Descriptors :   (*REFRACTORY MATERIALS, ZIRCONIUM OXIDES), (*ZIRCONIUM OXIDES, STABILIZATION), THERMAL STABILITY, MATERIAL FORMING, MICROSTRUCTURE, CRYSTAL STRUCTURE, USSR

Subject Categories : Ceramics, Refractories and Glass

Distribution Statement : APPROVED FOR PUBLIC RELEASE