通过水淬法对原位合成与热压烧结制备的组分为ZrB_2-20%(体积分数,下同)SiC-6.05%ZrC陶瓷材料的热震性能进行了研究.对比了不同热震温差、室温水(25℃)与沸水冷却环境、单次与五次循环热震次数以及高温氧化对原位合成试样抗热震性能的影响.计算了原位合成与热压烧结两种工艺制备的同组分试样的抗热震参数,结合试验结果探讨了材料的抗热震机理.结果表明,原位合成试样的抗热震性能优于热压烧结试样.
The thermal shock behavior of ZrB_2-20% SiC -6.05% ZrC composites fabricated with in-situ method and hot-pressing was studied by means of quenching into water from high temperatures. The effects of thermal shock temperature differences, cool (25 ℃ of bath temperature) and boiling water as cooling medium, single and five cyclic shocks and high temperature oxidation on thermal shock resistance of samples fabricated through in-situ method were investigated. The thermal shock resistance parameters of samples fabricated through in-situ method and hot pressing were compared and then the mechanism of thermal shock resistance was also discussed. The results show that thermal shock property of in-situ sample was better than that of hot-pressing sample.
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