Structure and properties of nanocrystalline rare earth bulks prepared by spark plasma sintering
来源期刊：JOURNAL OF RARE EARTHS2009年第6期
论文作者：ZHANG Jiuxing LIU Xuemei SONG Xiaoyan LU Nianduan
Key words：spark plasma sintering; ultrafine nanocrystalline bulk; physical property; rare earths;
Abstract: A series of rare earth bulks with the ultrafine nanocrystalline structure were prepared by applying an "oxygen-free" (an environ-mental oxygen concentration less than 0.5 ppm) in-situ synthesis system, where the inert-gas condensation was combined with the spark plasma sintering technology into an entirely closed system. The thermal and mechanical properties of the prepared ultrafine nanocrystalline bulks were characterized and compared with those of the raw polycrystalline bulks. It was found that the specific heat capacity, the micro-hardness, and the elastic modulus of the ultrafine nanocrystalline rare earth bulks were significantly increased from the conventional poly-crystalline bulks.
ZHANG Jiuxing1，LIU Xuemei1，SONG Xiaoyan1，LU Nianduan1
(1.College of Materials Science and Engineering,Key Lab of Advanced Functional Materials,Chinese Ministry of Education,Beijing University of Technology,Beijing 100124,China)
Abstract:A series of rare earth bulks with the ultrafine nanocrystalline structure were prepared by applying an "oxygen-free" (an environ-mental oxygen concentration less than 0.5 ppm) in-situ synthesis system, where the inert-gas condensation was combined with the spark plasma sintering technology into an entirely closed system. The thermal and mechanical properties of the prepared ultrafine nanocrystalline bulks were characterized and compared with those of the raw polycrystalline bulks. It was found that the specific heat capacity, the micro-hardness, and the elastic modulus of the ultrafine nanocrystalline rare earth bulks were significantly increased from the conventional poly-crystalline bulks.
Key words:spark plasma sintering; ultrafine nanocrystalline bulk; physical property; rare earths;
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