Abstract
Low-cost and low-purity β-Si3N4 powder was sintered at 1900°C for 8h in 1 MPa nitrogen gas with 2mol% Y2O3-2mol%Al2O3 additives. Fully densified bodies were obtained by the gas-pressured-sintering. This material had a strength of 689 MPa and a fracture toughness of 6.4 MPa·m1/2. Furthermore, the high temperature strength, oxidation resistance, fatigue parameter were measured. The degradation of strength at elevated temperature was less than 5% up to 900°C. No fatal defect was created in 100h-oxidation in 900°C-air. The fatigue parameter was on a level with general material produced from α-rich powder. These properties are adequate for structural material application.
Sign-in/Register to access full text options 
Free) 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a call
