Description
Vacuum
plasma spraying
equipment
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 **0 ℃
environment, Ti easily with O2, H2, and N2 and CO2 reaction.
Because of plasma arc jet high temperature (as high as ****0
℃), 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 *7 MPa, and vacuum coating (VPS)
the combination of Ti coating strength of *0 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 *2%, but the
crystallinity of VPS HA coating is more than *0%, 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 ***0 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 withω ZrO2 = *0% 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.
Service and quality
acceptance:
1, free package equipment
installation debugging and operator training. Equipment quality
safe warranty period.
2, our quality policy is: "with
satisfactory products and sincere service, distinct
characteristics, meet the demand of customers".
3, enterprise with complete before
the sale of after-sales service system, the company also provides
warranty period of maintenance, after maintenance services (only
charge the corresponding cost).
4, we will provide you perfect
service enthusiasm accurately and timely, make great efforts to
meet and exceed your expectations and requirements. Please contact
with us immediately.
