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以稀土单质钐为例,研究了通过放电等离子烧结制备晶态与非晶态结构的纳米块体材料及其形成机制.实验获得了非晶态、晶态与非晶态双相结构的纯稀土纳米块体材料及纳米多晶块体材料.制备的纳米多晶块体晶粒尺寸均明显小于初始纳米粉末粒径,改变了以往由纳米粉末烧结制备块体纳米晶材料时人们关于纳米晶粒尺寸必定大于初始粉末粒径的传统认识,为粉末烧结制备纳米块体材料提供了创新思路和制备方法.提出的材料制备机制及技术可推广至多种纳米块体材料的制备,为研究稀土纳米材料的物理、化学、力学性能及其纳米尺寸效应提供了先决条件.
Taking rare earth elemental samarium as an example, the preparation of nanocrystalline materials with crystalline and amorphous structure by spark plasma sintering and its formation mechanism were studied.The pure rare earths with amorphous, amorphous and crystalline phases Nano-block materials and nano-polycrystalline bulk materials prepared nano-polycrystalline lump grain size were significantly smaller than the initial size of the nano-powder, changing the nano-powder sintered nano- The size must be greater than the traditional understanding of the initial powder particle size, powder sintering for the preparation of nano-block material provides innovative ideas and preparation methods proposed material preparation mechanism and technology can be extended to a variety of nano-block material preparation for the study of rare earth nano-materials The physical, chemical, mechanical properties and nano-size effect provides a prerequisite.