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Microwave Sintering of Si3N4 Ceramics

  • Jinsong Zhang (a1), Lihua Cao (a1) and Fei Xia (a1)


The Si3N4 ceramics(91wt%Si3N4+5wt%Y2O3+4wt%Al2O3) of room temperature strength 620--760 MPa and fracture toughness 7 MPa-m½ were prepared by microwave sintering and their microstructure and mechanical properties were studied.The experiment results show that the higher N2 pressure (>4atm) is very necessary for microwave sintering of Si3N4 ceramics; microwave sintering can greatly decrease the sintering temperature to 1500* C, and increase the transformation rate of α to β-Si3N4,and reduce the total sintering time to about 1 hour. The mechanical properties of the Si3N4 ceramics sintered by microwave are better than that by conventional pressureless sintering.



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1. Janney, M.A.,in:Ceramic Transactions,Ceramic Powder Science,II,B, ed. by Messing, G.L.,etl.(Amera. Ceram. Soc., 1988)
2. Swain, B., Met.Prog.,134(1988)3
3. Tian, Y.L.,in:Microwave processing of Materials,vol.124, ed. by Sutton, W.H.(Materials Research Society,1988)
4. Kate, J.D.,in:Microwave Processing of Materials, vol.124, ed. by Sutton, W.H. (Materials Research Society, 1988)

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Microwave Sintering of Si3N4 Ceramics

  • Jinsong Zhang (a1), Lihua Cao (a1) and Fei Xia (a1)


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