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用水热氢还原法制备镍包铝喷涂粉体,研究了粉体的表面前处理对包覆后粉体性能的影响.通过金相显微镜研究粉体颗粒包覆的完整性,用XRD和SEM分别表征粉体的相组成和颗粒的形貌.试验表明,铝粉经过NaOH处理并彻底清洗可以得到包覆完整的喷涂粉体. 相似文献
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During the plasma spheroidization process powders undergo different changes in their microstructures and crystal phases. In this paper, simple calculation of heat transfer between the plasma and a suspended particle was performed based on three hypotheses for the purpose of guiding experiments. Experimental investigation of the crystal phases and microstructural changes during the plasma processing was made using silica, alumina and nickel powders as starting materials. It has been revealed from the experimental results that these materials undergo different changes in crystal phases and microstructures, and these changes are essentially determined by the structures, properties and aggregate states of the starting materials. 相似文献
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