Chemical Strengthening of Ceramic Materials.
Abstract
An investigation of the effect of compressive surface layers on the strength of polycrystalline ceramic bodies is described. The use of quenching, and glazing and quenching to form compressive surface layers was emphasized. The treatments were applied to several strong polycrystalline alumina bodies, sapphire single crystals, electrical porcelain, and zirconia. 96% alumina rods quenched in silicone oil had average flexural strengths as high as 105,600 psi. Glazing and quenching in silicone oil was also effective in improving the flexural strength of 96% alumina. Average flexural strengths as high as 112,800 psi, with individual strengths as high as 122,300 psi, were observed. Improvements in tensile strength, thermal shock resistance and delayed fracture characteristics were also demonstrated. Fluorothermal sintering and fiber reinforcement were used to strengthen sintered fused silica. The appendices of the report contain a detailed discussion of the properties of the 96% alumina control samples and methods of calculating the thermal and residual stresses produced by quenching. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 06, 1970
- Accession Number
- AD0864178
Entities
People
- Dennis R. Platts
- Henry P. Kirchner
- Regina A. Ewig
- Robert M. Gruver
- W. R. Buessem