等离子体预处理的炭/炭复合材料等离子喷涂制备羟基磷灰石涂层

摘要

为了提高等离子喷涂法所制羟基磷灰石涂层与炭/炭复合材料的结合力,采用氩气等离子体预处理结合等离子体喷涂法在炭/炭基体表面制备羟基磷灰石涂层,采用扫描电镜、X射线衍射仪、红外光谱仪、划痕仪等研究羟基磷灰石涂层的形貌、相组成以及羟基磷灰石涂层与基体的结合力.结果表明:采用或不采用等离子体处理炭/炭复合材料,羟基磷灰石涂层形貌和相组成接近,羟基磷灰石涂层的临界载荷分别为14.0 N、8.9N,前者比后者临界载荷提高了57.3％.采用等离子体处理可提高等离子体喷涂羟基磷灰石涂层与炭/炭复合材料基体的结合力.%Carbon/carbon composites pretreated by an argon plasma were coated by hydroxyapatite (HA) using a plasma spraying method.The morphology,the compositions of the coating and bond strength between HA and substrate were investigated by scanning electron microscopy,X-ray diffraction,infrared spectrometry and a scratching test.Results indicate that although the morphology and phase compositions of the HA coating are similar,the substrate critical load,above which apparent spallation of the coating occurs,was 14.0 and 8.9 N with or without the pretreatnent respectively,indicating that the argon plasma pretreatment improves the bond strength between the coating and the substrate.