ダイカスト金型鋼に関する研究(第2報) : PVD処理した熱間金型鋼の皮膜挙動について

概要

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The effects of TiN and CrN coating on the life of die for aluminium die casting have been studied, coating were carried out using the PVD process. Sample coated with TiN and CrN were evaluated by erosion tests using a molten bath of aluminium and thermal fatigue tests. The surfaces and sectional areas of these samples were examined the scanning electron microscopy and electron probe X-ray microanalyses. The results obtained were summari2ed as follows : (1) In the erosion test of the samples, the weight loss of TIN coating sample were smaller than those of the CrN coating and the ordinary SKD61 samples. (2) Crack propagation in these samples duaring the thermal fatigue test showed that the CrN coating sample generated cracks more rapidly than ordinaly SXD61 and TiN coating samples. (3) Electron probe X-ray microanalyses of the TiN coating sample showed micro-blowholes, which are considered to be formed either during the vaporization process or during thermal fatigue test were observed in the boundary between the matrix and TiN film and sulfur was detected on the wall in the micro-blowholes. It can be considered that the grain boundary segregation of sulfur occurred during the testing. It was also found that the TiN film grew into the blowholes after 10000 cycle tested.
公益社団法人精密工学会の論文
1990-05-05