温度和助剂含量对放电等离子烧结SiC陶瓷的影响
Effects of temperature and additives content on SiC ceramics prepared by spark plasma sintering
查看参考文献29篇
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文摘
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采用Al_2O_3-Y_2O_3-CaO作为烧结助剂制备SiC陶瓷,通过阿基米德排水法、XRD、SEM、TEM及维氏硬度测试等方法,探究烧结温度及烧结助剂含量对SiC陶瓷相对密度、物相结构、微观形貌和力学性能的影响。结果表明:在1300~ 1800℃下,SiC陶瓷相对密度、硬度以及断裂韧性都呈现出先增加后降低的趋势,在1700℃达到最大值;1700~1800℃发生了β-SiC向α-SiC的相变;减少烧结助剂含量会增加晶界结合强度,提升硬度,并抑制晶粒生长;在1700℃和7%(质量分数)烧结助剂含量的条件下,获得了最佳的烧结效果,相对密度、硬度和断裂韧度分别为97.9%,23.3GPa和4.1MPa·m~(1/2)。 |
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其他语种文摘
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SiC ceramics were sintered with Al_2O_3-Y_2O_3-CaO as additives.The effects of sintering temperature and additives content on the relative density,polytype,microstructure and mechanical properties of SiC ceramics were investigated by Archimedes drainage method,XRD,SEM,TEM and Vickers hardness test.The results show that the relative density,hardness and fracture toughness of SiC ceramics increase firstly and then decrease from 1300 ℃to 1800 ℃,and reach the maximum at 1700℃.The phase transformation fromβ-SiC toα-SiC occurs between 1700℃and 1800℃.Reducing the content of additives can increase the grain boundary bonding strength,and can improve the hardness and inhibition of the grain growth.Under the condition of 1700℃and 7% (mass fraction) additives content,the best sintering results are obtained,with relative density,hardness and toughness of 97.9%,23.3GPa and 4.1MPa·m~(1/2),respectively. |
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来源
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材料工程
,2023,51(3):52-58 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2021.000584
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关键词
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碳化硅
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烧结温度
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烧结助剂
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微观形貌
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力学性能
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地址
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中国航发北京航空材料研究院, 先进复合材料国防科技重点实验室, 北京, 100095
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语种
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中文 |
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文献类型
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研究性论文 |
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ISSN
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1001-4381 |
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学科
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一般工业技术 |
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文献收藏号
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CSCD:7445143
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