纳米氧化锆对氧化镁陶瓷抗热震性的影响
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摘要
本工作以高纯氧化镁粉、纳米单斜氧化锆粉为原料,通过配料、成型,分别在1 350℃、1 450℃、1 550℃保温2 h后烧结,制备了氧化镁陶瓷试样。研究了单斜氧化锆加入量、烧结温度对氧化镁陶瓷的烧结性能和抗热震性的影响。结果表明:加入纳米单斜氧化锆可以提高氧化镁陶瓷的显微结构均匀性,降低烧结温度和促进试样的致密化;加入纳米单斜氧化锆的试样通过微裂纹增韧、相变增韧以及微裂纹偏转增韧提高氧化镁陶瓷的抗热震性。加入12%(质量分数)的纳米单斜氧化锆的样品在1 450℃烧结而成的试样的抗热震性最优。
The magnesia ceramic specimens were prepared by high purity magnesia powder and nano-monoclinic zirconia powder as raw material. The specimens were sintered at 1 350 ℃, 1 450 ℃ and 1 550 ℃ for holding 2 hours, respectively. The effects of adding quantity of nano-monoclinic zirconia and sintering temperature on the sintering property and thermal shock resistance of magnesia ceramic were investigated. The results show that the densification and the microstructure homogeneity are improved, sintering temperature is decreased by adding monoclinic zirconia into magnesia ceramic. The thermal shock resistance of specimens with nano-monoclinic zirconia is improved due to mechanisms of microcrack toughening, phase transformation toughening and crack deflection toughening. The optimal scheme to improve thermal shock resistance of magnesia ceramic is adding 12 wt% monoclinic zirconia and sintering at 1 450 ℃.
The magnesia ceramic specimens were prepared by high purity magnesia powder and nano-monoclinic zirconia powder as raw material. The specimens were sintered at 1 350 ℃, 1 450 ℃ and 1 550 ℃ for holding 2 hours, respectively. The effects of adding quantity of nano-monoclinic zirconia and sintering temperature on the sintering property and thermal shock resistance of magnesia ceramic were investigated. The results show that the densification and the microstructure homogeneity are improved, sintering temperature is decreased by adding monoclinic zirconia into magnesia ceramic. The thermal shock resistance of specimens with nano-monoclinic zirconia is improved due to mechanisms of microcrack toughening, phase transformation toughening and crack deflection toughening. The optimal scheme to improve thermal shock resistance of magnesia ceramic is adding 12 wt% monoclinic zirconia and sintering at 1 450 ℃.
引文
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