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A study of wear resistance of plasma-sprayed and laser-remelted coatings on aluminium alloy
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Abstract
En 中文
Two kinds of alloys Ni-Cr-B-Si and Ni-Cr-B-Si + WC were plasma sprayed onto aluminium alloy. The coatings were remelted successively with a CO2 laser. A comparison of the wear resistance properties of both laser-treated and plasma-sprayed samples with those of aluminium alloy was conducted. A scanning electron microscope (SEM) was used to analyse wear phenomena of samples. Experimental results showed that the laser-treated and plasma-sprayed samples demonstrated, in general, good wear resistance. The laser remelted Ni-Cr-B-Si sample exhibited the highest wear resistance, and the laser remelted samples were much better than the as-sprayed samples. The plasma-sprayed Ni-Cr-B-Si + WC sample had better wear resistance than the sample without WC, However, the laser-treated Ni-Cr-B-Si + WC sample did not enhance its wear resistance compared with laser-treated Ni-Cr-B-Si sample. The worn surface analysis showed that the alloyed layer of the laser-treated samples was very compact, the worn surface was smooth and granular peeling was hardly observed. The worn surface of the plasma-sprayed sample was rather loose and there was granular peeling on the worn surface. (C) 2000 Elsevier Science S,A. All rights reserved.
Keywords:
laser remelting
plasma spraying
wear
aluminium alloys
Journal
IF:
6.1
Papers:
2.8W
Citations:
7.1W
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