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自1986年Gleiter等关于纳米材料的结构和性能的首次报告以来,国际、国内广泛开展了纳米材料的制备及其性能研究。纳米晶体既不是长程有序,也不是短程有序的,而是具有全新固体结构的材料,因而有与晶体或非晶体完全不同的独特性质。又由于纳米粉末有大的比表面积,高的化学活性,可以在非常低的温度下制备出化学成分均匀、致密的陶瓷体。获得高纯,化学成分均匀、超细、团聚程度小的超微粉是保证氧化锆增韧陶瓷样品具有高强度,韧性及其可靠性的关键。本文报道用柠檬酸盐爆炸分解法制备ZrO_2纳米超微粉,与其它化学方法相比它具有粒子分布均匀,无团聚现象,有F心等特点。并研究其微结构和顺磁
Since the first report of Gleiter et al. On the structure and properties of nanomaterials in 1986, the preparation and properties of nanomaterials have been extensively studied internationally and domestically. Nanocrystals are neither long-range nor short-range ordered, but rather have a completely new solid-state material and thus have distinct properties that are completely different from crystalline or amorphous. Owing to the large specific surface area and high chemical activity of nanopowder, it is possible to produce a ceramic body of uniform and dense chemical composition at a very low temperature. To obtain high purity, uniform chemical composition, ultrafine, small degree of agglomeration of ultrafine powder is to ensure that zirconia toughened ceramic samples with high strength, toughness and reliability of the key. This paper reports the use of citrate explosion decomposition of ZrO_2 nanosized powder, compared with other chemical methods, it has the characteristics of uniform particle distribution, no agglomeration, F heart. And study its microstructure and paramagnetic