Formation of Bioactive Ceramic Layer on Bulk Metallic Glass by Growing Integration Layer [GIL] Method

In the ceramic/metal joining and coating, the most difficult problem is how to overcome poor adhesion of ceramic layers by their cracking and/or peeling arising from their intrinsic brittleness. We have proposed a novel concept and technology "Growing Integration Layer" [GIL] method where compositionally, structurally and texturally graded intermediate layer(s) between ceramic and metallic materials to improve the adhesion performance. Those GIL(s) can be prepared from an active component of the metallic material by chemical and/or electrochemical reactions in a solution at low temperatures of RT-200 . BaTiO 3 or SrTiO 3 /TiO x GIL films on Ti plates formed by hydrothermal-electrochemical method showed excellent adhesion. The GIL strategy is also effective for metallic alloys and bulk metallic glasses (BMG) because they generally contain active component(s). Sodium titanate hydrate nano-mesh layer was formed on Tibased BMG by this GIL method in NaOH solution at 90 for 2h. The nano-mesh layer was bioactive, because bone-like apatite layer was deposited on it in the Simulated Body Fluid at 37.