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실험계획법에 의한 니켈기 경질 용사코팅의 최적 공정 설계
김균택(K. T. Kim),김영식(Y. S. Kim) 한국동력기계공학회 2009 한국동력기계공학회 학술대회 논문집 Vol.2009 No.11
In this work, the optimal process has been designed by L<SUB>9</SUB>(3<SUP>4</SUP>)orthogonal array and analysis of variance(ANOVA) for thermal-sprayed Ni-based hard coating. Ni-based hard coatings were fabricated by flame spray process on steel substrate. Then, the hardness test and observation of microstructure of the coatings were performed. The results of hardness test were analyzed by ANOVA. The ANOVA results demonstrated that the acetylene gas flow had the greatest effect on hardness of the coatings. The oxygen gas flow was found to have a neglecting effect. From these results, the optimal combination of the flame spray parameters could be predicted. The calculated hardness of the coatings by ANOVA was found to lie close to that of confirmation experimental result. Thus, it was considered that design of experiments design using orthogonal array and ANOVA was useful to determine optimal process of thermal-sprayed Ni-based hard coating.
니켈기 자융성 합금 코팅층의 마모거동에 미치는 상대마모재의 영향
김균택(K. T. Kim),김영식(Y. S. Kim) 한국동력기계공학회 2007 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study aims at investigating the wear behavior of thermally sprayed Ni-based self-flux alloy coatings against different counterparts. Ni-based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then heat-treated at temperature of 1000 ℃. Dry sliding wear tests were performed using the sliding speeds of 0.2 and 0.8 m/s and the applied loads of 5 and 20 N. AISI 52100, Al₂O₃, Si₃N₄4 and ZrO₂ balls were used as counterpart materials. Wear behavior of Ni-based self-flux alloy coatings against different counterparts were studied using a scanning electron microscope(SEM) and energy dispersive X-ray spectroscopy (EDX). It was revealed that wear behavior of Ni-based self-flux alloy coatings were much influenced by counterpart materials.
니켈기 자융성 합금 코팅층의 마모거동에 미치는 후열처리 조건의 영향
김균택(K. T. Kim),김영식(Y. S. Kim),오명석(M. S. Oh) 한국동력기계공학회 2006 한국동력기계공학회 학술대회 논문집 Vol.- No.-
This study aims at investigating the effect of heat treatment condition on the dry sliding wear behavior of thermally sprayed Ni-based self-flux alloy coatings. Ni-based self-flux alloy powders were flame-sprayed onto a carbon steel substrate and then heat-treated at 700, 800, 900 and 1000℃ for 30 minutes in a vacuum furnace. Dry sliding wear tests were performed using sliding speed of 0.4 m/s and applied load of 6 N. AISI 52100 ball(diameter 8 ㎜) was used as counterparts. Wear behavior of as-sprayed and heat-treated Ni-based self-flux alloy coatings was studied using a scanning electron microscope(SEM) and X-ray diffraction(XRD). It was revealed that microstructure and wear behavior of thermally sprayed Ni-based self-flux alloy coatings were much influenced by heat treatment condition.