The in-situ fabricating of the bioceramic coating by laser cladding
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摘要: 激光熔覆直接处理CaHPO4·2H2O与CaCO3的复合粉末,制备出了羟基磷灰石(HAP)生物陶瓷涂层。结果表明,熔覆层组织为粒状的HAP分布于互相搭接的棒状β-Ca2P2O7之中,熔覆层主要物相为β-Ca2P2O7与Ca5(PO4)3(OH)。涂层与基体结合处为平界面外延生长的带状组织,熔覆层中部则为典型的胞状晶,熔覆层表面组织为粒状等轴晶,组织演化决定于激光熔覆时的温度梯度/凝固速度(G/R)的比值。Abstract: The bioceramic coating is fabricaed by laser cladding directly processing the mixed power of CaHPO4·2H2O and CaCO3.It is shown that the microstructure of the coating is the granular HAP distributed in the ov erlapped club-shaped β-Ca2P2O7 and the main phases in the coating are β-Ca2P2O7 and Ca5(PO4)3(OH);there is the bonded structure of the extension growth on plane basis between the substrate and the cladding layer,typical cellular crystals in the middle of the molten layer and equiaxed crystals at the top of the cladding layer.The microstructure evolution is determined by the ratio of temperature gradient and solidification velocity(G/R) produced by laser cladding.
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Keywords:
- laser cladding /
- bioceramic coating /
- phases /
- olidification microstructure
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