STRENGTH OF A CERAMIC AT HIGH TEMPERATURES UNDER DIAMETRAL COMPRESSION
Journal Title: ASIAN JOURNAL OF NATURAL & APPLIED SCIENCES - Year 2012, Vol 1, Issue 2
Abstract
A novel design is presented for the high temperature compression testing of ceramic discs up to temperature of 1300oC. Two proprietary silicon nitrides containing magnesia (MgO) and a mixture of magnesia and yttria (MgO + Y2O3) were pressureless sintered and their tensile strengths measured at room temperature and elevated temperatures (900oC to 1270oC) using the diametral compression disc test.The results obtained showed that the material sintered with MgO maintained only 28% of its room temperature strength at 1270oC whilst the material sintered with a mixture of MgO and Y2O3 maintained 90% and 89% of its room temperature strength at 900oC and 1270oC respectively.Grain fracture/pull out were observed in some of the samples doped with Yttria at high temperature which gives room for speculation that both intergranular and transgranular fracture mechanisms were perhaps operative in this material.
Authors and Affiliations
J. E. O. Ovri, T. J. Davies
Keywords
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