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Gradient Bioceremics Composite Coating Produced by Wide-Band Laser Cladding on Surface of Ti Alloy and Its Cell Biocompatibility

Author: LiWenFei
Tutor: LiuQiBin
School: Guizhou University
Course: Materials Science
Keywords: Broadband laser cladding Gradient of rare earth bio - ceramic coating Different Ca / P Organizational structure Cytocompatibility
CLC: TG174.4
Type: Master's thesis
Year: 2008
Downloads: 145
Quote: 0
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Abstract


Hydroxyapatite (HA) has good biocompatibility and biological activity. However, the mechanical properties of HA are not satisfactory, and its bending strength and fracture toughness are lower than the dense bone, thus limiting its application in the load-bearing parts of the human body. Although titanium and its alloys have good biocompatibility and mechanical properties of titanium and its alloys is biologically inert material, almost does not have biological activity. Therefore, the titanium alloy substrate having adhered to the biological activity of HA coating, the COMPREHENSIVE the substrate strength and the biological activity of the HA coating is considered to be the most promising load-bearing bone replacement materials. Issues of preparation of bio-ceramic coating the broadband laser cladding processing technology, using a gradient design ideas, different types, different levels of rare earth to improve the biological activity of the laser cladding hydroxyapatite coating and biological compatibility, titanium (the TC 4 ) Surface preparation containing HA beta-TCP active bio-ceramic composite coating, and the use of XRD, SEM, microhardness analysis of bioactive gradient coating organizational structure to carry out an in-depth study; evaluation of the compatibility of bio-ceramic composite coating cells from the cell biology level. The results show that: (1) gradient bio-ceramic composite coating is divided into the substrate alloy layer, and bio-ceramic layer three levels, and a combination of gradient layer interface are good chemical metallurgical bonding. Rare earth oxide CeO 2 and Y 2 O 3 in broadband laser cladding process, you can reduce the cracking sensitivity of the coating, thinning grain. (2) rare earth oxide CeO 2 and Y 2 O 3 laser cladding Bioceramic process in both induce the synthesis of HA beta-TCP role. (3) Ca / P = 1.5 of powder generated in the ratio by laser cladding ceramic tissue compared with Ca / P = 1.4 ceramic Organization fine crystalline state, and maximum number of catalytic synthesis of HA beta-TCP the corresponding the CeO 2 Add the amount is different. When the Ca / P = 1.4, the CEO 2 of amounts up to 0.4wt. Most synthetic HA beta-TCP quantity%; while the Ca / P = 1.5, the Add CeO 2 of the amount of 0.2-0.4wt. Most the synthetic HA beta-TCP quantity% range. (4) containing rare earth oxides CEO 2 and Y of 2 O 3 coating on osteoblast cells are non-toxic side effects. The number of bio-ceramic coating the surface of the activity of calcium and phosphorus-based ceramic phase affects osteoblast proliferation, when the Ca / P = 1.4, containing 0.4wt. % CeO 2 coating has the largest number of cell proliferation, and the containing CeO 2 coating than with Y 2 the O 3 coating having 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
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