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OALib Journal期刊
ISSN: 2333-9721
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稀土Nd超细纳米晶块体的制备及其物理性能
, PP. 739-743
Keywords: 放电等离子烧结,非晶晶化,超细纳米晶,稀土
Abstract:
利用放电等离子烧结技术，采用纳米颗粒非晶晶化的创新制备路线，通过调整放电等离子烧结的工艺参数，制备获得了纯稀土金属钕的非晶态、非晶与纳米晶双相结构和超细纳米晶的块体材料。利用高分辨透射电镜表征了制备材料的显微结构。通过热力学分析，得出钕超细纳米晶块体材料由hcp相向bcc相转变的温度约为650oC，相对于传统的粗晶材料降低了约200oC。对传统粗晶和超细纳米晶的纯钕块体材料分别测定了电阻率、热导率和热膨胀系数及其随温度的变化规律，发现纯钕超细纳米晶的电阻率较传统粗晶材料明显升高，而热导率与传统粗晶相比则降低了约３倍。
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