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Gradient Bioceremics Composite Coating Produced by Wide-Band Laser Cladding on Surface of Ti Alloy and Interction with Protein

Author: WuLing
Tutor: LiuQiBin
School: Guizhou University
Course: Materials Science
Keywords: Band Laser Cladding Gradient of rare earth bio- ceramic coating Organizational structure Simulated body fluid (SBF) Biological activity Protein
CLC: TG174.46
Type: Master's thesis
Year: 2009
Downloads: 27
Quote: 0
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Abstract


Has good biocompatibility and mechanical properties of titanium and its alloys, titanium and its alloys are biologically inert material, almost not biologically active. Hydroxyapatite (HA) has good biocompatibility and biological activity. The mechanical properties of the HA is not satisfactory, the flexural strength and fracture toughness were lower than the dense bone, which limits its application in load-bearing parts of the body. Therefore, the titanium alloy matrix adhesion bioactive HA coating, the comprehensive utilization of the strength of the matrix and the biological activity of the HA coating, is considered to be the most promising bearing bone replacement material. The bioceramic coating problem now prepared to take advantage of the broadband laser cladding technology, using a gradient design ideas, surface preparation of titanium alloy (TC 4 ) containing HA β-TCP active bio-ceramic composite coating layer, and by adding different types and content of rare earth oxides to improve the bioactivity and biocompatibility of the hydroxyapatite coating. By means of XRD, SEM study of different types and content of rare earth oxides in the laser cladding coatings organizational structure; bioactive bio-ceramic composite coating immersed in simulated body fluid (SBF); and The in vitro cell culture, and rare earth gradient coating with protein interactions, and the test coating surface osteoblastic tumor cells cultured in different ceramic coating the surface of the sample expressed in different time landmark protein secretion. The results show that: (1) gradient the biological ceramic composite coating is divided into the substrate alloy layer, as well as bio-ceramic layer three levels, and a combination of gradient layer interface are chemical metallurgical bonding. Rare earth oxides CeO 2 and Y 2 O 3 the broadband laser cladding process can reduce the coating cracking sensitivity, refinement grain. (2) rare earth oxides CeO 2 and Y 2 O 3 laser cladding in the bioceramics process of both induced synthesis of HA β-TCP role. Ca / P = 1.4 powder ratio by laser cladding generate small ceramic tissue, crystalline state, and the maximum number of catalytic synthesis of HA β-TCP corresponding CeO 2 and Y 2 O 3 add the amount is different. When the Ca / P = 1.4, of CeO 2 added amount of up to 0.4wt.%, The quantity of the synthetic HA β-TCP. (3) the biological activity of the biological coating of rare earth with different rare earth oxide content is closely related to induction of the quantity of the synthetic HA β-TCP. When CeO 2 the added amount of 0.4wt.% The Y- 2 O 3 0.6wt.%, The precipitation of bone-like apatite up; 14 days after immersion coating significantly higher than the number of bone-like apatite 7 days precipitation. (4) the coating surface containing rare earth oxides CeO 2 and Y- of 2 O 3 coating on osteoblast toxic side effects, proliferation of the bioceramic coating the surface of calcium and phosphorus-based active ceramic phase affects the number of osteoblasts. When Ca / P = 1.4, when CeO 2 the added amount of 0.4wt.% Y 2 O 3 0.6wt.% when, coating the surface of hydroxyproline and alkaline phosphatase secretion up; and containing CeO 2 coating than Y-containing 2 O < / sub> coating has more number of cell proliferation.

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CLC: > Industrial Technology > Metallurgy and Metal Craft > Metallurgy and Heat Treatment > Metal corrosion protection,metal surface treatment > Corrosion control and protection > Metal surface protection technology > Organic complex layer of protection
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