喷涂距离和喷涂功率对羟基磷灰石涂层的影响

Effect of Spray Distance and Spray Power on Properties of Plasma Sprayed Hydroxyapatite Coatings

本文以Ｔｉ－６Ａｌ－４Ｖ合金为基体材料，采用等离子喷涂方法，在不同喷涂距离和喷涂功率下制备羟基磷灰石（ＨＡ）涂层，研究喷涂距离和喷涂功率这两个重要的喷涂参数对涂层结构和组成的影响．使用扫描电子显微镜（ＳＥＭ）观察了羟基磷灰石涂层的形貌．涂层的相组成由Ｘ射线衍射谱仪（ＸＲＤ）分析而得．并使用Ｘ射线荧光谱仪（ＸＲＦ）测定了涂层的Ｃａ／Ｐ摩尔比．研究结果表明，喷涂距离对羟基磷灰石涂层的形貌、相组成以及Ｃａ／Ｐ摩尔比有着明显的影响．随着喷涂距离的增大，羟基磷灰石粉末的熔化状态得到改善，涂层的显微结构较为致密．然而，喷涂距离的增大使得涂层的非晶化更加严重，涂层中非晶相含量增大．在实验范围内，喷涂功率对涂层结构和相组成的影响不明显．Ｃａ／Ｐ比测定显示，等离子喷涂羟基磷灰石涂层均为缺磷涂层，Ｃａ／Ｐ比随喷涂距离的增大而降低，随喷涂功率的增大而增大．

Hydroxyapatite (HA) coatings on Ti-6Al-4V substrate were prepared by atmospheric plasmasprating method under a variety of spray distances and spray powers. The structure of HA coatingswere then studied by Scanning Electron Microscopy (SEM), and X--ray Diffractometer (XRD) wasapplied to determine the phase composition of the coatings. The Ca/P mole ratios of the coatingswere examined by X-ray Fluoroscopy (XRF). Experimental results indicated that with the increaseof spray distance, the melting state of the HA coating was improved but the crystallinity of coatingwas reduced. However, the surface images and crystallinity of coatings were not influenced by spraypower significantly. The Ca/P ratio showed a higher value at shorter spray distance but increasedwith increase in spray power.