Nb-Si超高温材料的放电等离子烧结(SPS)工艺研究
Spark Plasma Sintering Process for Nb-Si Ultra-high Temperature Materials
查看参考文献19篇
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文摘
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以Nb,Si粉末为原料,采用放电等离子烧结(SPS)技术制备了二元Nb-Si超高温材料,研究了烧结温度、保温时间、加热速率和冷却速率等工艺参数对材料物相组成、微观组织和室温力学性能的影响。结果表明:烧结温度在1300℃以上时,材料主要由Nb_(ss)(铌基固溶体)和α-Nb_5Si_3两相组成,材料的致密度和室温力学性能随着烧结温度的升高而不断提高,在1600℃制备的材料力学性能最好;在1600℃时,随着保温时间的延长,材料的物相组成和微观组织基本没有变化,而其力学性能有小幅度提高;较慢的加热速率和烧结完成后较快的冷却速率均有利于提高材料的室温力学性能。应用优化后的SPS工艺,制备出了室温综合力学性能优异的Nb-Si超高温材料。 |
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其他语种文摘
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Nb-Si ultra-high temperature material was prepared by sparking plasma sintering (SPS) technology using the mixed powders of niobium and silicon. The effect of process parameters, such as sintering temperature, holding time, heating and cooling rates in the sintering process, on the phase composition, microstructure and room temperature mechanical properties of the material was investigated. The results show that the material mainly consists of two phases of Nb_(ss) (Nb based solid solution) and α-Nb_5Si_3 as sintered above 1300℃. The relative density and mechanical properties of the material are enhanced continuously with increasing sintering temperature. The material prepared at 1600℃ has the optimum mechanical performance. The phase composition and the microstructure remain unchanged with increasing the holding time at 1600℃, while the mechanical properties of the material are improved slightly. The slow heating rate and the rapid cooling rate after sintering are favorable for improving the room temperature mechanical properties. With the application of an optimized SPS process, Nb-Si ultra-high temperature material with superior comprehensive room temperature mechanical properties can be prepared. |
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来源
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材料工程
,2016,44(3):1-8 【核心库】
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DOI
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10.11868/j.issn.1001-4381.2016.03.001
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关键词
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Nb-Si超高温材料
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SPS工艺
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力学性能
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微观组织
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地址
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中国科学院兰州化学物理研究所, 固体润滑国家重点实验室, 兰州, 730000
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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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金属学与金属工艺 |
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基金
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中国科学院“百人计划”项目
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国家自然科学基金
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文献收藏号
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CSCD:5659241
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