발간논문

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Vol.40, No.10, 1118 ~ 1127, 2002
Title
Research Papers / Materials Processing : Effects of Thermal Spraying Methods and Temperature on the Friction and Wear Behavior of the Al-Ni-Co-Si Quasicrystalline Coating Layers
김재수J. S. Kim , 김우찬Y. C. Kim , Eric Fleury , 김도향D. H. Kim , 김원태W. T. Kim , 안효석H. S. Ahn , 이상목S. M. Lee
Abstract
Powders of Al-Ni-Co-Si alloys were produced by gas-atomization under protective N_2 atmosphere. The gas-atomized powders were sieved to select them having a size range of -200∼+400 mesh. Quasicrystalline coatings were deposited onto the 304 stainless steel substrates using two thermal spraying techniques: high velocity oxygen fuel (HVOF) and air plasma spraying(APS). The friction and wear behaviors of the coatings were evaluated under the various conditions. The wear amount of both the coating and the chromium coated cast iron disc during the testing was determined by measuring the weight loss after the test. Analysis of the wear debris and of the wear track on both the coating and Cr coated cast iron disk was observed by using scanning electron microscopy. Friction coefficient of the plasma coating was about 0.36 and of the HVOF coating was about 0.43. The APS-deposited coatings, which had a higher level of porosity, exhibited a higher friction coefficient and lower wear resistance than the HVOF processed coatings. However, as the temperature during wear testing increased, the wear resistance of APS was improved and tended to be similar to that of HVOF coatings. Higher wear resistance of HVOF was attributed to the densification of the coating sub-surface with lower porosity and agglomeration of shall wear debris into large cylindrical particles and foramtion of intermediate layer.
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