SPS工艺参数对ZrB<sub>2</sub>-MoSi<sub>2</sub>-SiC复合陶瓷组织与高温抗氧化性能的影响

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摘要采用放电等离子烧结法,在烧结温度为1 700~2 000 ℃,升温速率为75~150 ℃/min,保温3~10 min条件下制备ZrB₂-MoSi₂-SiC复合陶瓷(ZMS15陶瓷),研究烧结温度、升温速率和保温时间等工艺参数对材料致密度以及1 200 ℃高温抗氧化性能的影响。结果表明：ZrB₂-MoSi₂-SiC复合陶瓷的致密度随烧结温度升高和升温速率增大而增大,保温时间为7 min时致密度最大。ZMS15陶瓷高温氧化时形成双层结构的氧化层,外层为玻璃态SiO₂层,内层为颗粒状富ZrO₂层。随烧结温度升高,材料的抗氧化性能增强。ZrB₂-MoSi₂-SiC复合陶瓷的最佳SPS工艺为烧结温度2 000 ℃、升温速率125 ℃/min、保温时间7 min,所得陶瓷的相对密度大于98.5%,在1 200 ℃氧化72 h后的质量增加率小于8 mg/cm²。

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	张玉栋
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关键词 ：放电等离子烧结, ZrB₂-MoSi₂-SiC陶瓷, 工艺参数, 相对密度, 抗氧化性能

Abstract：ZrB₂-MoSi₂-SiC composite ceramics (ZMS15 ceramics) were prepared by spark plasma sintering (SPS) at the sintering temperature of 1 700-2 000 ℃, heating rate of 75-150 ℃/min and holding time of 3-10 min. The effects of sintering temperature, heating rate and holding time on the relative density and the oxidation resistance at 1 200 ℃ of the composite ceramics were studied. The results show that the relative density of ZrB₂-MoSi₂-SiC composite ceramics increases with the increase of sintering temperature and heating rate, and the relative density reaches the maximum value when the holding time is 7 min. ZMS15 ceramic forms a double-layer structure during oxidation. The outer layer is glassy SiO₂ layer, and the inner layer is granular ZrO₂ layer. With increasing sintering temperature, the high temperture oxidation resistance of the material increases. The optimal SPS process for ZrB₂-MoSi₂-SiC composite ceramics is sintering temperature of 2 000 ℃, heating rate of 125 ℃/min, and holding time of 7 min. The relative density of the ceramics is greater than 98.5%, and the mass change is less than 8 mg/cm²after oxidation at 1 200 ℃ for 72 h.

Key words： spark plasma sintering ZrB₂-MoSi₂-SiC ceramic process parameters relative density oxidation resistance

收稿日期: 2020-09-04 出版日期: 2021-01-18

ZTFLH:

TB35

基金资助:国家自然科学基金资助项目(51901069)

通讯作者: 李继文,教授,博士。电话：13525983980;E-mail: ljwzq@163.com

引用本文:

张玉栋, 李继文, 王南南, 潘昆明, 张亮亮. SPS工艺参数对ZrB₂-MoSi₂-SiC复合陶瓷组织与高温抗氧化性能的影响[J]. 粉末冶金材料科学与工程, 2020, 25(6): 505-512.
ZHANG Yudong, LI Jiwen, WANG Nannan, PAN Kunming, ZHANG Liangliang. Effects of SPS process parameters on microstructure and high-temperature oxidation resistance of ZrB₂-MoSi₂-SiC composite ceramics. Materials Science and Engineering of Powder Metallurgy, 2020, 25(6): 505-512.

链接本文:

http://pmbjb.csu.edu.cn/CN/ 或 http://pmbjb.csu.edu.cn/CN/Y2020/V25/I6/505

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