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Method for preparing vacuum hotpressing sintered wear-resistant coating on surface of metallic titanium and titanium alloy base material

A vacuum hot-pressing sintering and wear-resistant coating technology, applied in heating inorganic powder coating and other directions, can solve the problems of reducing fatigue life, reducing wear resistance of composites, and being difficult to form, and achieves improved fatigue properties and good wear resistance. The effect of material wear performance

Inactive Publication Date: 2009-04-29
SHENYANG UNIV
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  • Application Information

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Problems solved by technology

However, such a wear-resistant layer not only has a high elastic limit, but also has a large elastic coefficient, and it is difficult to obtain a dense structure for the wear-resistant layer formed by simple thermal spraying. The elastic coefficient and elastic deformation are inconsistent and reduce their fatigue life to varying degrees (some even as high as 60%)
If laser cladding or remelting after thermal spraying is used to cover titanium-nickel alloy and titanium diboride (TiB) on the surface of metal titanium and titanium alloy 2 ) composite modified layer, on the one hand, it is difficult to form a TiNi(β) phase matrix with superelastic properties due to the large amount of melting of the substrate, and at the same time, the TiB 2 It is easy to react with Ti to form acicular TiB at high temperature, which reduces the wear resistance of the composite

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0015] A preparation method of vacuum hot pressing sintering wear-resistant coating on the surface of metal titanium substrate:

[0016] The basic raw materials are titanium powder and nickel powder with an average particle diameter of 45 μm and 5 μm and a purity of 99.6% approximately spherical equiatomic ratio, adding 10-30 mol% of diboron with an average particle size of 1.5 μm and a purity of more than 99%. Titanium oxide (TiB 2 ) powder, put the above-mentioned titanium, nickel and titanium diboride powder into a mixing drum filled with industrial ethanol solution, and mix continuously for 12 hours on the drum mixer, and then distill the titanium, nickel and titanium diboride The mixed powder is separated from ethanol, and the separated mixed powder is further dried under 1Pa vacuum condition for 30 minutes. At the same time, the surface of the metal titanium is manually ground with 800# water grinding paper to remove the oxide film on the surface, and then the mixed powd...

Embodiment 2

[0018] A method for preparing a vacuum hot-pressing sintering wear-resistant coating on the surface of a titanium alloy substrate:

[0019] The basic raw materials are titanium powder and nickel powder with an average particle diameter of 45 μm and 5 μm and a purity of 99.6% approximately spherical equiatomic ratio, adding 10-30 mol% of diboron with an average particle size of 1.5 μm and a purity of more than 99%. Titanium oxide (TiB 2 ) powder, put the above-mentioned titanium, nickel and titanium diboride powder into a mixing drum filled with industrial ethanol solution, and mix continuously for 12 hours on the drum mixer, and then distill the titanium, nickel and titanium diboride The mixed powder is separated from ethanol, and the separated mixed powder is further dried under 1Pa vacuum condition for 30 minutes. At the same time, the surface of the metal titanium is manually ground with 800# water grinding paper to remove the oxide film on the surface, and then the mixed p...

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Abstract

The invention provides a method for preparing vacuum hot-pressed sintered wear-resistant coatings on the surfaces of metallic titanium and titanium alloy substrates. The method comprises the following steps of well mixing and then smearing titanium powder, nickel powder and titanium diboride powder on block metallic titanium or titanium alloy, putting the block metallic titanium or the titanium alloy in a graphite mold, placing the graphite mold in a vacuum hot-pressing furnace, applying axial pressure to the block metallic titanium or the titanium alloy in thegraphite mold, heating the graphite mold together with the block metallic titanium or the titanium alloy and mixed powder to 899.85 to 999.85 DEG C, unloading after preserving heat for 30 minutes, cooling to lower than 399.85 DEG C under a vacuum condition, opening the vacuum hot-pressing furnace, taking out and cooling the graphite mold to a room temperature, taking out the metallic titaniumor the titanium alloy from the graphite mold, and forming a complex wear-resistant coating of titanium-nickel alloy and titanium diboride on the surface of the metallic titanium or the titanium alloy. The wear-resistant coating of the invention is characterized in that the coating has high wear properties of wear-resistant materials, has a TiNi (beta) phase matrix with stable superelasticity performance, and can effectively improve the fatigue properties of the metallic titanium and the titanium alloy.

Description

Technical field: [0001] The invention relates to a preparation method of metal titanium and titanium alloy vacuum hot pressing sintering wear-resistant coating. Background technique: [0002] At present, sputtering and other methods are used to form equiatomic or nearly equiatomic ratio titanium-nickel alloy films on the surface of metal titanium and titanium alloys, which have been widely used and studied, but the wear resistance of this film is insufficient. In order to effectively improve the wear resistance of metal titanium and titanium alloy surfaces, it is necessary to form a thick wear-resistant (modified) layer. This thick wear-resistant layer is usually obtained by methods such as laser cladding or nitriding treatment. However, such a wear-resistant layer not only has a high elastic limit, but also has a large elastic coefficient, and it is difficult to obtain a dense structure for the wear-resistant layer formed by simple thermal spraying. The elastic coefficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C24/08
Inventor 丁龙先王艳敏张凤荣唐意成于文馨
Owner SHENYANG UNIV
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