【摘要】 介绍在奥氏体型不锈钢基材上预置涂覆具有一定梯度的生物陶瓷粉末（ＨＡＰ或ＣＳＨＰＯ４２Ｈ２Ｏ＋ＣａＣＯ３）的激光熔覆．经ＳＥＭ，ＥＤＳ，ＸＲＤ分析表明，低输出功率、高扫描速率是获得激光生物陶瓷涂层的主要控制因素．预置涂覆ＣａＣＯ３与ＣａＨ（ＰＯ４）２Ｈ２Ｏ混合粉末涂层，在大于常规方法合成ＨＡＰ所需比例下，可激光合成含Ｃａ５（ＰＯ４）３（ＯＨ）等生物活性陶瓷的复合涂层，且存在一定量非晶态的自由表面区．更多还原

【Abstract】 Since 70s some scholars have tried to coat bioceramic on metal substrate by Plasma sPray, CVD and PVD etc. which is considered as one of most hopeful procedure combining bioceramie with metal.However,lin these processes the bioceramic coating has not good distribution and high bonding strength, which makes the coating drop off in clinical. Laser cladding is one of the advanced surface technology, but upto now it has not been used for cladding bioceramics. In this paper the step bioceramic.coating which was formed by preparing step bioceramic (HAP) or CaHPO4’ 2H2O-CaCO3 powders on austenic stainless steel and then laser cladding was studied. The results of SEM, EDS, XRD analyses show: (l) The main factors’ that are advantageous to the forming of bioceramic coating are the low power and high speed of laser. In this experiment the laser process parameters were optimized by orthogonal experiments as: power 400-600W, scanning speed 4- 12 mms-1, focus diameter 3-8mm. (2) When the rate of CaHPO4 2H2O / CaCO3 is larger than the rate in usually composition of HAP (in this experiment the rate of CaHPO4 2H2O / CaCO3 is 80 / 20) and the process of laser is suitable for coating, the composite bioceramic coating include Ca5(PO4)3(OH) can be formed. All bioceramic coating layer and stainless steel substrate exhibit good bonding, partly interconnect and interlock. Cracks and holes are hardly found because Ni / Al alloy powderhas low melting point and gives out heat itself in laser cladding. (3) After laser cladding the bioceramic surface coating is green and translucent. The composition of all surface coming is even. But it coatains Ni, A1 because of the liquid phase sintering of Ni / Al alloy powder, and more P is burnt than Ca in laser cladding.The microstructure of bioceramic coating is net and equigranular, whcih is very favourable to the growth of body organism. Because the prepared .powders were heated and’ melted by laser, liquids with high viscosityHAP phosphate or calcuiumbased inorganic compound were rapidly cooled to form an uncrystallized surfacecoating. This is the main feature to differentiate biaceramic coating from other coatings.(Correrpondent:ZHANG Yaping, Associate Professor, Department of Metallufgy and Material Engineering, CliongqmsUniversity, Chongqing 630044)更多还原