鎳基陶瓷鍍層製程及磨耗特性研究

• Main Authors: Pao-Chang Huang, 黃寶錩
• Other Authors: Kung-Hsu Hou
• Format: Others
• Language: zh-TW
• Published: 2006
• Online Access: http://ndltd.ncl.edu.tw/handle/47310388936287306352

碩士 === 國防大學中正理工學院 === 兵器系統工程研究所 === 94 === This study attempted to incorporate nano sized Al2O3 particles into a Ni-P alloy matrix by pulse current and direct current plating. The effects of bath composition and operating conditions of electrodeposited Ni-P-Al2O3 composite coatings were studied, and the micro-hardness of the deposits was determined. The dispersion of alumina particles in the matrix depends on the operational parameters that include current density; duty cycle and frequency are discussed. Experimental results show that the pulse plating with the particle size select mechanism, for example, the average diameter of Al2O3 particle would decrease when duty cycle decreased. Another, the pulse plating can provide more various phosphorous content and higher particle content in coatings than direct plating. The alumina particle volume content can had the maximum value of 30.31 vol.%, in this study. The wear resistance of the PC coatings can higher than DC coatings that were causing by the PC composites have higher particle contents and leading to higher hardness. The optimal parameters for wear resistance are Al2O3 particle 20 g/L in bath, peak current density 28.56A/dm2, duty cycle 0.7, pulse frequency 1000Hz. Wear test show that the wear resistance of this PC coating of above condition would have 9.5 times higher than DC Ni-P-Al2O3 coating which was produced under Al2O3 particle 20 g/L, and current density 5 A/dm2.