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A kind of preparation method of titanium-based surface composite coating

A surface composite, titanium-based technology, applied in the coating, metal material coating process, etc., can solve the problems of large machining allowance, high surface roughness of the coating layer, thin wear-resistant modified layer, etc.

Active Publication Date: 2019-08-16
北京睿曼科技有限公司 +2
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the commonly used in-situ synthesis composite coating technology on the surface of titanium alloy mainly includes: (1) ion implantation, vapor deposition, ion nitriding, laser gas nitriding and other titanium alloy surface carburizing, nitriding, boronizing, nitriding And surface modification technologies such as micro-arc oxidation. The advantages of the above surface modification technologies are that the surface of the modified layer is smooth and the process repeatability is good. The disadvantages are that the wear-resistant modified layer is thin, the treatment cycle is long, and the structure is difficult to control flexibly; (2) Plasma spraying, supersonic flame spraying and other thermal spraying technologies, the advantages of the above-mentioned thermal spraying technology are that large-area thick coatings can be prepared, the process is simple, and the cost is low, but there are high porosity of the coating, incomplete in-situ reaction, coating and (3) Laser surface treatment technologies such as laser cladding, laser remelting, laser phase transformation hardening, and laser surface alloying. The advantages of the above laser surface treatment technologies are that the coating and The substrate can form a metallurgical bond, the coating structure is dense, the in-situ reaction is sufficient, and the coating performance is good, but the disadvantages are high cost, large coating crack tendency, and high residual stress; (4) Traditional methods such as argon arc cladding and argon arc welding Welding treatment technology, the above-mentioned welding treatment technology has the advantages of simple process and low cost, but there are problems such as high surface roughness of the coating layer, uncontrollable coating quality and large subsequent processing allowance

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  • A kind of preparation method of titanium-based surface composite coating
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[0027] The embodiment of the invention discloses a method for preparing a titanium-based surface composite coating, which includes the following steps:

[0028] A), pre-treat the surface of the titanium base;

[0029] B). Pre-precursor powder coating on the surface of the titanium base obtained in step A); the precursor powder coating includes titanium powder, graphite powder and aluminum powder;

[0030] C), performing induction cladding on the pre-precursor powder coating on the titanium-based surface obtained in step B), and obtaining a titanium-based surface composite coating after cooling.

[0031] This application provides a method for preparing a titanium-based surface composite coating, which uses induction cladding to treat the titanium-based surface, so that the titanium-based surface synthesizes a titanium carbide reinforcing phase in situ, which is beneficial to the improvement of the comprehensive performance of the titanium-based surface .

[0032] In the process of prepa...

Embodiment 1

[0107] The size of the TC4 titanium alloy sheet with a size of 50mm×100mm×10mm is Ti6Al4V; the planar induction coil is 30mm×50mm, the coil square copper tube is 8.0mm×8.0mm, and the wall thickness is 0.5mm. The induction cladding equipment adopts GY-100AB type high frequency induction heating equipment from Dongguan Guangyuan Frequency Conversion Electronic Equipment Factory. The equipment has an oscillation frequency of 80-200kHz and an oscillation power of 100kW. The cladding raw material powders are respectively titanium powder (particle size 10-25μm, purity 99.9%), graphite powder (particle size 3-5μm, purity 99.99%) and aluminum powder (particle size 10-25μm, purity 99.9%).

[0108] (1) Cleaning and pretreatment of titanium alloy substrate

[0109] Using brown corundum as abrasive, the surface of the titanium alloy sheet to be cladding is pretreated by sandblasting to remove the surface oxide layer and oil stains, and then acetone solution is used to ultrasonically clean the ...

Embodiment 2

[0123] The size of the TC4 titanium alloy sheet with a size of 50mm×100mm×10mm is Ti6Al4V; the planar induction coil is 30mm×50mm, the coil square copper tube is 8.0mm×8.0mm, and the wall thickness is 0.5mm. The induction cladding equipment adopts GY-100AB type high frequency induction heating equipment from Dongguan Guangyuan Frequency Conversion Electronic Equipment Factory. The equipment has an oscillation frequency of 80-200kHz and an oscillation power of 100kW. The cladding raw material powders are respectively titanium powder (particle size 10-25μm, purity 99.9%), graphite powder (particle size 3-5μm, purity 99.99%) and aluminum powder (particle size 10-25μm, purity 99.9%).

[0124] This embodiment is used to illustrate the preparation method of the induction cladding in-situ synthesis of titanium carbide reinforced titanium-based composite coating of the present invention. Specifically, the method of this embodiment is similar to the method of embodiment 1, except that the ...

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Abstract

The invention provides a preparation method of a titanium base surface composite coating layer. The preparation method comprises the following steps: A) the surface of a titanium base is pretreated; B) a precursor powder coating layer is preset on the surface of the titanium base obtained in the step A), and includes titanium powder, graphite powder and aluminum powder; and C) the induction cladding is performed for the precursor powder coating layer preset on the surface of the titanium base obtained in the step B); and the titanium base surface composite coating layer is obtained after cooling. A titanium carbide reinforcement phase in the prepared titanium base composite coating layer is synthesized in situ, and is excellent in compatibility with a basal body, pure in interface, uniform in distribution and fine in particles; the coating layer is high in hardness and elastic modulus; and the excellent metallurgic bonding is formed between the coating layer and the basal body. Test results indicate that the average particle size of titanium carbide in the prepared titanium base surface composite coating layer is 2-8 microns and the microscopic hardness of the coating layer is 580-640 HV0.2.

Description

Technical field [0001] The invention relates to the technical field of surface treatment, in particular to a method for preparing a titanium-based surface composite coating. Background technique [0002] Titanium alloy has the advantages of low density, high specific strength, seawater corrosion resistance, non-magnetic, good biocompatibility, and excellent oxidation resistance. It is widely used in aerospace, navigation, chemical industry and biomedicine. However, the titanium alloy has a large friction coefficient, which is prone to problems of adhesive wear, fretting wear and low load-bearing capacity, which greatly reduces the safety, reliability and service life of the titanium alloy structure. Surface coating and surface modification technologies are effective means to improve the wear resistance of titanium alloys and increase the surface bearing capacity of titanium alloy components. [0003] Discontinuously reinforced titanium-based composites have the advantages of isotr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C24/10
CPCC23C24/103
Inventor 张伟于鹤龙汪勇吉小超王红美郭永明宋占永张梦清
Owner 北京睿曼科技有限公司