Surface boriding method capable of maintaining high strength of titanium alloy

A titanium alloy, high-strength technology, applied in the field of metal surface treatment, to achieve high strength and plasticity, prevent oxidation, ensure surface hardness and wear resistance

Inactive Publication Date: 2018-12-07
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] Aiming at the existing technical problems, the present invention provides a boronizing method that can not only maintain the high strength of titanium alloy but also improve the surface properties of titanium alloy

Method used

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  • Surface boriding method capable of maintaining high strength of titanium alloy
  • Surface boriding method capable of maintaining high strength of titanium alloy
  • Surface boriding method capable of maintaining high strength of titanium alloy

Examples

Experimental program
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Effect test

Embodiment 1

[0042] A method for surface boronizing capable of maintaining the high strength of titanium alloys, comprising the steps of:

[0043] S1. Preparation of boronizing agent: Take boron carbide powder and cerium oxide powder, weigh the boron carbide powder and cerium oxide powder according to the mass percentage of 19:1-99:1, mix them evenly, grind and screen, and obtain boron carbide powder with a particle size of less than 45 μm. Boronizing agent.

[0044] Preferably, the boron carbide powder is boron carbide powder with a purity of 93% to 97% produced by Mudanjiang Jinggong Abrasive Boron Carbide Co., Ltd., and the cerium oxide powder is cerium oxide powder with a purity of 99.95% produced by Sinopharm Chemical Reagent Co., Ltd.

[0045] Adding an appropriate amount of rare earth as a penetrating agent in the boronizing agent can further improve the surface hardness and wear resistance of the titanium alloy. The cerium oxide added in the present invention can improve the activ...

Embodiment 2

[0058] The steps of Example 2 are basically the same as those of Example 1, except that the heating temperature in Step S3 is 950° C., and the holding time is 40 h. Such as image 3 As shown, in this case, the infiltration layer at the boundary of the titanium alloy sample is very obvious, with a thickness of about 40 μm, which is caused by the increase of boronizing time. At this time, the titanium alloy matrix structure is a two-state structure, and the plasticity is relatively good.

[0059] Such as Figure 5 Shown is the physical picture of the titanium alloy tensile sample after infiltration. The tensile test of the titanium alloy tensile sample was carried out using a material universal testing machine. The test showed that the tensile strength of the titanium alloy tensile sample was 973.47MPa, and the elongation rate was 8%, indicating that the tensile strength of the titanium alloy tensile sample after boronizing Higher, better plasticity. After the titanium alloy...

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Abstract

The invention belongs to the technical field of metal surface treatment, and particularly relates to a surface boriding method capable of maintaining high strength of a titanium alloy. The method comprises the following steps: S1, boron carbide powder and cerium oxide powder are weighed to prepare a boriding agent; S2, deoiling, water rinsing, grinding, polishing and ultrasonic cleaning pretreatment is performed on a cut titanium alloy sample and a titanium alloy sample tension component; and S3, the treated titanium alloy sample and titanium sample tension component are subjected to boridingby utilizing the prepared boriding agent. By adopting the surface boriding method, the surface hardness and abrasion resistance of the titanium alloy are ensured; the high strength and plasticity of the titanium alloy material are also ensured by controlling temperature and heat preservation time according to the substrate structure change of the titanium alloy; and the application range of the titanium alloy is expanded.

Description

technical field [0001] The invention belongs to the technical field of metal surface treatment, in particular to a surface boronizing method capable of maintaining high strength of titanium alloy. Background technique [0002] Titanium alloy is one of the materials with the highest specific strength among the currently used materials. It has excellent characteristics such as low density, good heat resistance, small elastic modulus and small thermal expansion coefficient. The United States, the United Kingdom and Russia have all conducted a lot of research on titanium and its alloys, and their titanium alloy products have been widely used in aerospace, vehicle industry and ships. [0003] However, any material has its disadvantages. Titanium and its alloys have low hardness and are prone to wear. About 80% of titanium alloy machine parts failure is caused by friction and wear. These shortcomings limit the application range of titanium alloys in the field of friction. Theref...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/68
CPCC23C8/68
Inventor 姜波李凤华孙涛刘君婷
Owner NORTHEASTERN UNIV
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