理论推导了平板材料热冲击过程中瞬时温度分布和热应力分布.通过实验研究了ZrB2-20%SIC-10%AIN(ZSA)超高温陶瓷基复合材料的热物理性能、力学性能和其热冲击开裂过程,确定了不同厚度试样热冲击开裂的临界温差;随着试样厚度的增加,热冲击开裂的临界温差逐渐降低.通过理论计算的分布曲线和实验数据点的比较,预测了不同试样厚度的ZSA陶瓷基复合材料热冲击时的表面换热系数值,并计算了不同厚度试样热冲击过程中表面热应力随时间的变化关系,发现厚度为1mm的平板在其临界温差480℃下热震时,表面达到最大热应力所用的时间最短,然后热应力的降低速度也最快.
参考文献
| [1] | W.D.Kingery.Property Measurement at High Temperatures[M].Now York:John Wiley and Sons,Inc,1959 |
| [2] | C.M.Wang;M.Mitomo;H.Emoto .Nucleation and growth of silicon oxynitride grains in a fine-grained silicon nitride matrix[J].Journal of The American Ceramic Society,1998,70:2036-2040. |
| [3] | 王昕,谭训彦,尹衍升,周玉,候耀永.纳米复合陶瓷增韧机理分析[J].陶瓷学报,2000(02):107-111. |
| [4] | Niihara K .New design concepts of structural ceramics-ceramic nanocomposites[J].Journal of Ceram Soc Jpm,1991,99(10):974-982. |
| [5] | Piciacchio A;Lee S H;Messing GL .Processing and microstructure development in alumina-silicon carbide intragranular particulate composites[J].Journal of the American Ceramic Society,1994,77(08):2157-2164. |
| [6] | Marshall,D.B;Drory,M.D;Loh,R.L;Evans,A.G,A.G.Evans.Fracture in Ceramic Materials[M].Noyes Publication,New Jersey,1984:336. |
| [7] | S.Boskovic .Sintering of Si3N4 in the presence of additives form Y2O3-SiO2-Al2O3 system[J].Journal of Materials Science,1990,25:1513-1516. |
| [8] | Lynch,C.T.Handbook of Materials Science Vol,1 General Properties[M].CRC Press Inc,Clevelandt OH,1974:366. |
| [9] | Osterstock,F;Monot,I;Desgardin,G;Mordike,B.L .Influence of grain size on the toughness and thermal shock resistance of polycrystalline YBa2Cu3O7-δ[J].Journal of the European Ceramic Society,1996,16(07):687-694. |
| [10] | Ghndus,J.C;Tranchand,V.Thermal shock by water quench:numerical simulation,thermal shock and thermal fatigue behaviour of advanced ceramics[A].,1993:307-316. |
| [11] | Hasselman,D.P.H;Krohn,D.A .Effect of surface compression strengthening on thermal stress fracture of brittle ceramics[J].Science of Ceramics,1970,7:107-122. |
| [12] | D. Sherman and D. Schlumm .THICKNESS EFFECT IN THERMAL SHOCK OF ALUMINA CERAMICS[J].Scripta materialia,2000(8):819-825. |
| [13] | 姚仲鹏;王瑞君.传热学[M].北京:北京理工大学出版社,2003 |
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