| 摘要: |
| 采用低压等离子喷涂（LPPS）技术，用2种不同粒径的粉末，在铜基体上制备了厚度为0.7 mm以上的W涂层。通过扫描电镜（SEM）研究了涂层的微观形貌，并对粉末对W涂层的显微结构、结合强度、氧含量及热导率的影响进行了探讨。结果表明：细小粒径W粉所制备的W涂层孔隙率较低，但涂层存在明显的分层；粗粉所制备的W涂层结构均匀，涂层的内聚力与热导率分别达到了38 MPa和98.06 W/m?k，远高于细W粉涂层的23 MPa和75.36 W/m?k。细W粉涂层较低的性能和其严重的分层有关。 |
| 关键词: 粉末粒度 低压等离子喷涂 分层 |
| DOI： |
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| Effects of Particle Size on Low Pressure Plasma Spraying Thick W Coating |
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KUANG Xiao–jun1,2, LIU Min2, YIN Deng–feng1, DENG Chang–guang2, KUANG Zi–qi2, DENG Chun–ming21,2
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1. School of Material Science and Engineering of Central South University, Changsha 410083;2. Institute of Surface Engineering of Guangzhou Research Institute of Non–ferrous Metals, Guangzhou 510651
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| Abstract: |
| LPPS–W coatings with thickness over 0.7 mm were prepared on copper substrate with two kinds of tungsten powder as feedstocks. Microstructure for W coatings was analyzed by means of SEM, and the effects of particle size on the microstructure, adhesive strength, oxygen content and thermal conductivity for as–sprayed W coatings were discussed. The results indicated that W coating with fine W powder as feedstock exhibited relatively low porosity, while serious delamination was occurred for the as–sprayed W coating. W coating with coarse W powder as feedstock had an even microstructure, and the cohesive strength and thermal conductivity for the as–sprayed W coating was 38 MPa and 98.06 W/m?k respectively, which was far higher than that of the W coating with fine W powder as feedstock ( 23 MPa and 75.36 W/m?k ). The worse coating properties for W coating with fine W powder as feedstock was connected with the serious delamination in W coating. |
| Key words: particle size low pressure plasma spraying delamination |
