Oxidation resistance and high-temperature mechanical properties of porous Si2N2O/Si3N4 composite ceramics
1
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
Si2N2O/Si3N4 composite ceramics were prepared by pressureless sintered a Si3N4 and SiO2 mixture with 2 mol% Sm2O3. Theoxidation behavior and high-temperature strength of Si2N2O/Si3N4 composite materials have been examined. The typicaloxidation isotherm of Si2N2O/Si3N4 ceramic is represented by an asymptotic law. The oxidation rate for Si2N2O/Si3N4 was lowas compared with those for Si3N4 ceramic. Thin protective oxide scales formed after long exposures to air at 1400 oC andsubstantial crystallization of the intergranular glass phase with formation of Sm10(SiO4)6N2 occurred during oxidation. Besides,Si2N2O/Si3N4 composites showed excellent high-temperature strength like Si3N4 ceramic and the residual strength ratio can beup to 80 % at 1100 oC which is much higher than Si2N2O single-phase ceramic. The degradation of strength at highertemperature results from the increase of interganular glass phase due to diffusion of molecular oxygen.
Abstract
Si2N2O/Si3N4 composite ceramics were prepared by pressureless sintered a Si3N4 and SiO2 mixture with 2 mol% Sm2O3. Theoxidation behavior and high-temperature strength of Si2N2O/Si3N4 composite materials have been examined. The typicaloxidation isotherm of Si2N2O/Si3N4 ceramic is represented by an asymptotic law. The oxidation rate for Si2N2O/Si3N4 was lowas compared with those for Si3N4 ceramic. Thin protective oxide scales formed after long exposures to air at 1400 oC andsubstantial crystallization of the intergranular glass phase with formation of Sm10(SiO4)6N2 occurred during oxidation. Besides,Si2N2O/Si3N4 composites showed excellent high-temperature strength like Si3N4 ceramic and the residual strength ratio can beup to 80 % at 1100 oC which is much higher than Si2N2O single-phase ceramic. The degradation of strength at highertemperature results from the increase of interganular glass phase due to diffusion of molecular oxygen.
참고문헌 (15)
- F. -L. Riley, , J. Am. Ceram. Soc, 83, pp.245~265 (2000)
- K. -S. Mazdiyasni, , J. Am. Ceram. Soc, 64, pp.415~419 (1981)
- M. Radwan, , J. Eur. Ceram. Soc, 23, pp.2337~2341 (2003)
- R. -J. Xie, , J. Eur. Ceram. Soc, 22, pp.963~971 (2002)
- J. -B. Wen, , J. Am. Ceram. Soc, 102(1), pp.136~143 (2019)
- Wei Liting, "Mechanical, dielectric properties and thermal shock resistance of porous Si2N2O", Si3N4 composite ceramics, 2018, pp.19(2), 126~129[DOI]
- D. -C. Jia, , Mater. Chem. Phys, 124, pp.97~101 (2010)
- Y. -C. Pei, , Ceram. Int, 35, pp.3365~3369 (2009)
- M. Ohashi, , Ceram. Int, 23, pp.27~37 (1997)
- S. -C. Singhal, , J. Mater. Sci, 11(3), pp.500~509 (1976)
- F. Porz, , J. Mater. Sci, 19(4), pp.1283~1295 (1984)
- D. -R. Clarke, , J. Am. Ceram. Soc, 63, pp.586~589 (1980)
- D.-R.Clarke, "Progress in Nitrogen Ceramics", pp.421~ (1983), The Hague
- L. -T. Wei, , J. Chin. Ceram. Soc, 46(6), pp.780~784 (2018)
- C. O'Meara, , J. Eur. Ceram. Soc, 7, pp.369~378 (1991)