【摘要】 本文在有机泡沫浸渍法制备多孔氮化硅陶瓷的过程中,讨论了升温速度、烧结助剂的添加量和烧结温度对氮化硅网眼多孔陶瓷显微组织、物相和力学性能的影响。研究结果表明,随Y2O3和Al2O3的含量的增加,烧结体的强度明显增加,且含量为20%时较优。通过分析聚氨酯海绵的DSC-TDA曲线,得出在150～475℃温度区间,要缓慢升温。烧结温度在1700℃左右较优,且相变较完全。更多还原

【Abstract】 In the process of preparing porous silicon nitride ceramic by impregnating a polyurethane sponge,the effect of heating rate,the amount of additives and sintering temperature on the microstructure of porous silicon nitride ceramic,phase and mechanical properties are discussed.Result of study indicates,with the content of Y2O3 and Al2O3 increasing,the strength of sintering body obviously increases.And the optimum amount of their content is 20%.By analyzing the DSC-TDA curve of polyurethane sponge,it can be show the temperature should be slowly warmed up from 150 ℃ to 475 ℃.The optimum sintering temperature is about 1700 ℃,and the phase transition is more complete.更多还原