Correspondence: Solution ifcsSMdT6 Cheng H.net applied calcium-phosphorus ceramic coating on the surface of titanium alloy as an artificial bone grafting material with good mechanical properties of the substrate and excellent biocompatibility of the coating. A variety of methods have been developed for coating bioactive ceramic coating materials on medical metal surfaces, such as plasma spraying method 111, electrophoretic deposition method 121, and electrochemical deposition method 134, among which the most common one is the use of plasma spraying technology in metals. The surface is coated with a calcium-phosphorus ceramic coating. However, the high temperature of the plasma during the spraying process (instantaneous temperatures up to 6000-10000°C) can lead to severe phase transitions and subdivision of hydroxyapatite (HAP), making it difficult to obtain hydroxyapatite with natural bones. Structurally similar coating layers 15. Studies have shown that the biocompatibility and biological activity of hydroxyapatite coatings prepared using conventional plasma spraying techniques are significantly reduced, and generally require complex chemical post-treatment methods to achieve biological activity. As can be seen, the morphology of individual HAP crystals is quite different from that of pure HAP, although it is similar to that of the synergistic helium cathode surface inorganic hybrid. by! The chemical co-deposited layer in the toe is a cadaveric polymeric conjugated form in which there is a cylinder but the arrangement is very dense, and the boundaries between individual crystals have been difficult to distinguish. In addition, a very small amount of another form of phase can be seen, which may be polyvinyl acetate-based, with a small amount of HAP crystals. Therefore, the electrodeposited hybrid film layer is microscopically non-uniform, and there is a localized area on the metal surface where favorable electrowinning to form polyvinyl acetate is the main reaction. Since the first chain initiation of the electron addition reaction is performed by the free radical H and the organic monomer at the interface between the metal and the solution, it can be speculated that the electric addition reaction of the polyvinyl acetate occurs mainly at the cathode Escaped area.
In general, the first step of the electrochemical addition reaction is the generation of free radicals and the initiation of chains, which are performed at the interface of the metal electrode solution. The positively charged or polarized CH3COOCH=CH2 monomer migrates to the cathode in an aqueous solution, and the intermediate H generated at the cathode hydrogen evolution becomes an electrochemical addition reaction that causes the radical polymerization initiated by the organic monomer to proceed. Subsequent chain growth proceeds in the immediate vicinity of the metal solution interface. The electrochemical cathode deposition preparation of hydroxyapatite (HAP) bioceramic membrane layer, the principle is that hydrogen evolution causes the concentration of H ion at the interface of the metal solution to increase, that is, the pH rises by 11415, which causes post-HAP chemistry near the metal surface. Deposition reaction. Since the hydrogen evolution reaction permeates the entire reaction process of the electrochemical deposition of the HAP ceramic membrane layer, the radical H, which is an electro-additive polymerization initiator for the organic monomer, also exists in the entire electrodeposition process, which is simultaneous with the organic monomer. Electrochemical additions offer the possibility. Under the control of electrochemical conditions, the proper chemical environment of the electrode solution interface causes the co-deposition of HAP and CH3COOCH=CH2 to form a HAP-polyvinyl acetate composite coating. In addition, the proton-activated CH3COOCH=CH2 can also bond with hydrogen phosphate and other polyvinyl acetate macromolecules on the electrode surface steric hindrance and induction, and has a significant effect on the crystallization process and crystalline morphology of HAP. The organic-inorganic deposition layers are combined and cross-linked with each other, so that the binding force in the deposition layer phase and the deposition layer and the metal substrate are significantly enhanced.
Prior to the quantitative test of the adhesion of the cermet layer, the sample was first qualitatively analyzed using a commercially available tape. It shows that the electrodeposited HAP/organic polymer hybrid film layer has significantly increased interphase binding force, and tears the adhesive tape pasted on the surface of the HAP organic polymer hybrid film layer. No peeling ceramic powder was found on the tape paper. Electrodeposition of the surface of the HAP film can not withstand the adhesive tape. Then, a micro tensile tester was used to test the adhesion of the electrodeposited HAP organic polymer hybrid film layer to the surface of the metal substrate. The experimental results are shown in Table 3. Compared with the simple electrodeposited HAP film layer, the composite film layer and the metal matrix can be seen. The bond between the two has greatly increased.
Table 3 Bonding-Tensile Test Results and System Cracking Locations Tab.3 Resultfortheme:hanicaltest Sample Cracking Locations Addition of Organics Ceramic Coatings Ceramic Coatings - Binder, Binder-Binder Non-Organic Ceramic Coatings Metal Matrix - Ceramics Membrane layer 3 Conclusion An electrochemical technique has been developed for the simultaneous electropolymerization of polyvinyl acetate on metal surfaces and HAP electrodeposition for the preparation of HAP organic polymer hybrid films.
Characterization of HAP organic polymer film proves that the motor material content reaches 4%. Electrochemical co-deposition of HAP/T machine high polymer composite film has good mechanical properties and it is hopeful to solve the electrodeposition method for preparing HAP ceramic film layer. The technical problem of insufficient bonding strength with metal substrates.
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