Preparation Of Resisting High Temperature And Hard Wearing Material On Copper Surface

Cu and cu alloy bear particular properties. So they have become important materials for modern industry. But when used in mechanical engineering, they have short operational life span due to the friction factors. Its uses the sedimentary system for cu-si wear resistance materials, enhance the copper surface wear resistance. Its studied the preparation of the technological conditions of its organizational structure and performance, the main findings are as follows:The dense and uniform sedimentary deposit can be achieved by using fused-salt electrodeposition. The silicon content changes slowly with the changes of the depth.The sedimentary quality achieved by pulse electrodeposition is better than that got by direct current electrodeposition; that the dense pulse current is good for obtaining the deposition that is of meticulous crystallization; that too low or too high temperature is detrimental to the electrodeposition; and that prolonged electrodeposition time is propitious to the formation of the electrodeposition silicon, but the chances of defects will increase accordingly.We find that corrodent comprised of HCl 10mL + HNO3 10mL is good for corroding sediments. The growth mode of sedimentary crystal grains evolves gradually from columnar crystals to the equiax crystal plus a small amount of columnar crystal. The analysis on the phase composition indicates that silicon and copper has formed silicon-copper compounds. after silicon and copper have been oxidized. After deposition, the texture of the {111} crystal faces are significantly enhanced.The deposit and the matrix can be tightly bound by the combined actions of the mutual diffusion bonding and the epitaxial growth bonding. FGM bears excellent bonding properties. The electrodeposition has little effect on thermal dilation properties. The electrodeposition conditions has the equal influence on micro-hardness, wearing quality, and the physical form of the deposition. The better the deposition is the better micro-hardness and wearing quality is. After electrodeposition, the Wien micro-hardness of the FGM surface has been greatly improved. The highest value of hardness reaches 270 HV1.96/30, 3.5 times more than that before electrodeposition, that is, 76 HV1.96/30. Moreover, wearing quality has been significantly increased, which is related to micro- hardness to some extend, that is to say, the higher the hardness value is the better the wearing quality is.