火花等离子烧结制备ZrB2-SiC-ZrC复合材料的氧化响应

Mohsen Ghasilzadeh Jarvand, Z. Balak
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引用次数: 0

摘要

考虑到超高温陶瓷在氧化环境中的重要性和应用,本研究研究了ZrC含量和火花等离子烧结参数(温度、时间和压力)对ZrB2-SiC复合材料氧化响应的影响。在不同SPS条件和不同ZrC用量下制备三元复合材料样品后,在1400℃的箱式炉中进行烧结后氧化处理。延长SPS过程的时间和温度会导致样品的抗氧化性降低。造成这种现象的原因是,尽管样品致密性较好,但随着烧结过程温度和时间的增加,晶粒会急剧长大。对于SPS压力对复合材料氧化行为的影响,本研究尚未得到明确的结果。增加ZrC的量对样品的抗氧化性也没有积极的影响,因为该相本身在低温下会发生氧化。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Oxidation response of ZrB2–SiC–ZrC composites prepared by spark plasma sintering
Considering the importance and application of ultrahigh temperature ceramics in oxidizing environments, in this research, the effect of ZrC content and spark plasma sintering parameters (temperature, time and pressure) on the oxidation response of ZrB2–SiC composites has been investigated. After fabricating the ternary composite samples in different SPS conditions and with different amounts of ZrC, the post-sintering oxidation process was carried out in a box furnace at the temperature of 1400 °C. Increasing the time and temperature of the SPS process caused the decrease in the oxidation resistance of the samples. The reason for such observations was attributed to the extreme growth of grains with increasing the temperature and time of the sintering process despite the better densification of the samples. This research did not reach a clear result about the effect of SPS pressure on composites oxidation behavior. Increasing the amount of ZrC also did not have a positive effect on the oxidation resistance of the samples because this phase itself undergoes oxidation at low temperatures.
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