Accession Number : AD0448226


Title :   Chemical Strengthening of Ceramic Materials


Descriptive Note : Quarterly rept. no. 1, 7 Apr-7 Jul 1964


Corporate Author : LINDEN LABS INC STATE COLLEGE PA


Personal Author(s) : Kirchner, Henry P ; Gruver, Robert M


Full Text : https://apps.dtic.mil/dtic/tr/fulltext/u2/448226.pdf


Report Date : 07 Aug 1964


Pagination or Media Count : 38


Abstract : An investigation o the effect of compressive surface layers on the strength of polycrystalline ceramic bodies is described. The compressive surface layers are formed by reactions in the surface of the material at high temperatures, which result in solid solutions having lower thermal expansion coefficients that the bulk of the material. Since the surface layers tend to contract less than the bulk of the material, they are placed in compression during cooling to room temperature. The thermal expansion properties of a wide variety of oxide solid solutions were measured. Several of these materials have lower thermal expansion coefficients than the bodies on which they would be placed. Several methods of forming solid solution surface layers were investigated. Some of these methods show promise for formation of compressive surface layers.


Descriptors :   *CERAMIC MATERIALS , CRYSTAL GROWTH , OXIDES , PROCESSING , SPINEL , SURFACES , THERMAL PROPERTIES , TIN COMPOUNDS , X RAY DIFFRACTION , ZINC COMPOUNDS


Subject Categories : Ceramics, Refractories and Glass


Distribution Statement : APPROVED FOR PUBLIC RELEASE