مقاومت به گسترش ترک در دماهای بالا و نقش ارتباطی آن با مقاومت به شوک و خستگی گرمایی
نویسنده
چکیده
واژگان کلیدی : نیترورسیلیسیم، خواص تر مو مکانیکی، مقاومت به شوک گرمایی ، مقاومت به گسترش ترک
کلیدواژهها
عنوان مقاله [English]
Thermal Stress Resistance to Fracture and its Relation to with Resistance to Thermal Fatigue and Shock
نویسنده [English]
- M. Kalantar and G. Fantozzi
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
کلیدواژهها [English]
- Silicon nitride
- Thermo- mechanical properties
- Thermal shock resistance
- Crack propagation resistance
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