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Adopt vacuum plasma spraying technology excellent properties can be prepared Ti and HA coating. - details see: https://www.machineto.com/china-guangzhou-spraying-titanium-ti-hydroxyapatite-ha-coating-environmental-protection-vacuum-plasma-spraying-equipment-be-10162801

Vacuum plasma spraying equipment

Hydroxyapatite (Hydroxyapatite, HA) biological ceramic material with excellent biological activity and biocompatibility, but HA sintering intensity is low after, and large brittle, to meet clinical use requirement. In recent years, the use of material surface treatment technology will HA biological ceramic materials coated in titanium alloy of metal substrate surface to form HA biological ceramic coating material. HA biological ceramic coating can give full play to the biological ceramic material and titanium alloy material each advantage, and overcome the shortcomings of their respective, better meet the need of clinical application

1. The artificial joint surface vacuum plasma arc spraying Ti, HA coating

The artificial joint surface vacuum plasma arc spraying Ti, HA coating Ti or its alloy in the substrate of sedimentary plasma spraying titanium (Ti), hydroxyapatite (HA) coating has set up a file in the clinical application of gain. Plasma arc spraying is a high temperature process, powder spraying process in there is a complicated physical and chemical change. Plasma arc spraying HA coating and its spraying powder, compared to happen structure and composition of the change, and lead to coating of crystallinity decreased. In the higher than 500°Cenvironment, Ti easily with O2, H2, and N2 and CO2 reaction. Because of plasma arc jet high temperature (as high as 10000°C), in the atmosphere on plasma arc spraying, Ti will react with the surrounding atmosphere. Spraying created during the reaction products will often reduce the ductility of coating, and lead to material produces crack

2. Vacuum plasma arc spraying and atmospheric plasma arc spraying, in comparison

with jet speed, the temperature is lower, spraying room atmosphere controllable and other features, is the preparation of dense, coating oxygen levels low, composition and powder approaches. Figure 1 for vacuum plasma spraying equipment. Apply the vacuum technology can be prepared by plasma spraying good performance of Ti and HA coating.

Apply the vacuum technology can be prepared by plasma spraying good performance of Ti and HA coating.

Figure 1 vacuum plasma spraying equipment

3. In the Ti-6 Al-4 V substrate by vacuum and atmospheric plasma arc spraying Ti, HA coating prepared,

and compares them, found the spray coating oxidation atmosphere Ti is more serious, coating contain a lot of TiO2 and TiO. And in the vacuum coating, the oxidation to avoid. The oxidation of the coating affect the it and alloy substrate union, atmospheric spraying (APS) Ti coating and the base of the bond strength between about 37 MPa, and vacuum coating (VPS) the combination of Ti coating strength of 60 MPa. Compared with the original powder, plasma spraying HA coating contain some amorphous and new phase, such as CaO and Ca3 (PO4) 2. Amorphous phase formation is mainly due to high temperature melting in the particles in the basal spraying on caused by reports; And CaO and Ca3 (PO4) 2 and other new phase is from spraying process HA decomposition. Vacuum spray coating of amorphous and HA new phase significantly reduced, this is mainly thanks to VPS spraying low flame flow temperature measuring results of crystallinity display, the APS HA, the crystallinity of coating is only 42%, but the crystallinity of VPS HA coating is more than 60%, can meet clinical implanted on the coating of crystallinity requirements. Vacuum plasma spraying Ti-HA coating artificial hip actual parts figure 2.Already spraying artificial hip implant about 7000 pieces.

Figure 2 by vacuum plasma spraying titanium-hydroxyapatite coating artificial hip

4. HA matrix composite coating. Adopt plasma arc spraying technology, in the Ti-6 Al-4 V alloy substrate, the preparation of Ti, HA HA / / TiO2, HA/ZrO2, on composite coating, can effectively improve coating and the union between substrate.

Bond strength analysis shows that, in HA coating blended with metal or ceramic composition etc, the combination of coating can be improved. By HA/ZrO2 composite coating, for example, mixed withωZrO2 = 60% of the composite coatings combined with strength than pure HA coating about a times higher. With the improvement of strength, mainly because of doping thing to ease the coating substrate and the hot coefficient of expansion between the mismatch, reducing the thermal expansion coefficient mismatch lead to the remnants of the thermal stress in the coating and matrix interface in concentration. In addition, the combination of doping thing small body high strength is also composite coating to improve the bonding strength one important reason.

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