Title: Microstructure and Performance of Tungsten Coatings Prepared by Low Pressure Plasma Spraying
Abstract: W coatings with thickness of 0.9~1.2 mm were fabricated on CuCrZr substrate by low pressure plasma spraying(LPPS) while four sets of spraying parameters were adopted.The microstructure,oxygen content and thermal conductivity of assprayed W coatings were analyzed with a scanning electron microscope,an oxygen and nitrogen analyzer,and a flashlight heat conducting meter.The pore size distribution of the W coatings prepared under the optimized spraying parameters was determined,and the effects of spraying power and vacuum chamber pressure on the microstructure and performance of assprayed W coatings were investigated.It was found that the four kinds of assprayed W coatings all had laminar structure,and the W coating obtained under the optimized spraying parameters had a compactness of 98.4%,an oxygen content of 0.2%(mass fraction),a thermal conductivity of 110.76 W/(m·K),and a pore size distribution of 0.2~4.0 μm(the dominant pore size was about 1.0 μm).
Publication Year: 2013
Publication Date: 2013-01-01
Language: en
Type: article
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