Microstructure and Bonding Feature of the Bioceramic Composite Coating Obtained by Nd: YAG Laser Cladding

Abstract:

Undesirable phase and microstructure formation, and poor HAP/metal bonding strength restrict the fabrication technique to obtain HAP and other calcium phosphate ceramic coatings. In this paper a bioceramic composite coating, which includes HAP andβ-Ca2P2O7, was obtained by laser cladding with pre-depositing mixed powders of CaHPO4·2H2O and CaCO3 directly on the 316L stainless steel metal substrate. The phases, microstructure and bonding feature of the bioceramic composite coating are characterized by X-ray diffraction(XRD), scanning electron microscopy-energy dispersive spectroscopy(SEM-EDS). The microstructure of the coating consists of minute granular HAP that is distributed among the overlapped club-shapedβ-Ca2P2O7. Uniform presences of Ca, P and O in bioceramic composite coating supplie necessary elements for the synthesis of HAP andβ-Ca2P2O7. Diffusions inwards of P and O into alloying layer help form the chemical metallurgical bonding and composition gradient distributions are present. a chemical metallurgical bonding was formed between the bioceramic composite coating and metal substrate.

• Periodical: Key Engineering Materials (Volumes 361-363)
• Pages: 697-700
• DOI: https://doi.org/10.4028/www.scientific.net/KEM.361-363.697
• Online since: November 2007
• Authors: Ying Chun Wang, Yan Min Li, Zhen Min Xu, Qi Lin Deng, Jian Guo Li, Yao He Zhou
• Keywords: Beta-Calcium Pyrophosphate, Bioceramic Composite Coating, Chemical Metallurgical Bonding, Diffusion, Hydroxyapatite (HAP), Laser Cladding

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