【摘要】 <正> 目前牙科医生和骨科医生将一种能与金属基牢固结合的特殊涂层用于人体的适当部位。这种涂层是采用等离子束流将Ca₁₀（PO₄）₆（OH）₂（即人造骨粉）粉末喷涂于金属基体材料表面而制成的[1～2]。本文采用适宜的等离子束流喷涂技术,将人造骨粉粉末成功地喷涂在Co-Cr-Mo为基体的金属人工关节表面,使金属材料强度高、韧性好、易成形的特点与人造骨粉耐蚀、耐磨和与人体具有良好生物相容性的特点结合在一起,获得了医疗性能优良的涂层。试验发现,若喷涂电流小于260A可导致粉末熔化不良。若喷涂电流大于400A,涂更多还原

【Abstract】 At present special coat is employed by dentists and orthopaedists to bind metal objects firmly to suitable parts of the human body. Such specific coating is made by plasma spraying Ca₁₀（PO₄）₆（OH）₂ powder onto the surface of metal substrate. It is believed that the authors are the first to utilize such special coat to improve the performance of synthetic metal arthrosis. We make the coat in such a way that the good qualities of both base metal and artificial bone powder are retained. It is well known that base metal is high in strength, ductile and easily formed, and that artificial bone powder is corrosion-resistant, wear-resitant and biologically compatible with the human body. When are current is less than 260A, the result is that powder is insufficiently melted. When the are current is higher than 400A, it often happens that the coat oxidizes and spalls. The authors find that when the arc current is 350-360A, the powder is properly melted and no oxidation occurs. When suitable parameters are adopted, the mechanical properties of the coat are quite satisfatory and bond strength between coat and metal-substrate can be higher than 35 MPa. Fig.1 shows the fractography of tensilely fractured "dual" specimen. "Dual" specimen consists of two specimens of base metal whose coating is joined with adhesive. "Dual" specimens generally fracture within coat layer or at adhesive and only 1% fracture at bond interface between coat and metal-substrate. Thus, when suitable technological parameters of plasma spraying are adopted, artificial bone powder coating with good bonding characteristic can be obtained. Fig.2 shows the bond interface between coat layer and metal-substrate. It can be seen that such a bone interface is uneven and firmly binds coating layer to base metal. It can also be seen that there is no change in the structure of the metal of the synthetic arthrosis. ESCA analysis shows that Ca, O₂, P and C contained in coating layer are the same as those of standard model. This means that suitable spraying parameters do not alter chemical composition of artificial bone powder.更多还原