Volume 22, Issue 1 (7-2003)
2003, 22(1): 189-202 |
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M. Kalantar and G. Fantozzi. Thermal Stress Resistance to Fracture and its Relation to with Resistance to Thermal Fatigue and Shock. Journal of Advanced Materials in Engineering (Esteghlal) 2003; 22 (1) :189-202
URL: http://jame.iut.ac.ir/article-1-282-en.html
URL: http://jame.iut.ac.ir/article-1-282-en.html
Abstract: (7175 Views)
Dense Silicon nitride was investigated to determine the effect of its microstructural parameters and densification on thermo-mechanical properties and thermal stress resistance to fracture initiation during a hot or cold mechanical and thermal shock testing. The different materials and microstructures were obtained by changing the parameters such as the type of the powder, additive, forming process and sintering condition. Maximum crack growth and thermal shock resistance of dense Si3N4 are achieved after complete conversion of the aàB transformation, and after the change in grain morphology towards elongated
grain and the relative crystallization of the second phases have been obtained. The characteristics are obtained by a high a phase content of the starting powder, high Y2O3, and sintering condition of higher temperature (2000ْC), longer soaking times (1h) and load application at the beginning of the thermal cycle.
Keywords: Silicon nitride, Thermo- mechanical properties, Thermal shock resistance, Crack propagation resistance
Keywords: Silicon nitride, Thermo- mechanical properties, Thermal shock resistance, Crack propagation resistance
