POWDER DIFFRACTION INVESTIGATIONS OF PLASMA-SPRAYED ZIRCONIA
POWDER DIFFRACTION INVESTIGATIONS OF PLASMA-SPRAYED ZIRCONIA
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DOI：
10.1007/bf00375275
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发表时间：
1995-03-15
影响因子：
4.5
通讯作者：
FREY, F
中科院分区：
文献类型：
--
作者：
BONDARS, B;HEIDEMANE, G;FREY, F
用X射线衍射和中子粉末衍射研究了等离子喷涂纯氧化锆粉末的晶体学和显微结构参数。淬火气体的流量对相组成（四斜晶系与单斜晶系的比率在0.6和3.5之间变化）和微观结构的显着影响被观察到，而所有研究样品的两相的结构参数基本保持不变，并接近文献中报道的那些。这些结果不支持的概念，作为一个稳定的因素，为tetraxide相的临界粒径效应。通过在845 ℃下加热，观察到从四斜晶相到单斜晶相的转变，而微晶尺寸没有任何可测量的变化。中子粉末图案上非常高的背景可能是由样品中存在的孔隙引起的。
The crystallographic and microstructural parameters of plasma sprayed pure zirconia powders were studied by X-ray and neutron powder diffraction. A significant influence of the flow rate of the quenching gas on the phase composition (the tetragonal to monoclinic ratio varied between 0.6 and 3.5) and on the micro-structure was observed, while structural parameters of both phases of all investigated samples remained essentially unchanged and were close to those reported in the literature. These results do not support the concept of a critical particle size effect as a stabilizing factor for the tetragonal phase. A transition from a tetragonal to a monoclinic phase was observed without any measurable change in the crystallite sizes by heating at 845 degrees C. A very high background on the neutron powder patterns may have been caused by the presence of pores in the samples.