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Method for obtaining boride diffusion layer on surface of titanium alloy

A technology of titanium alloy and diffusion layer, applied in solid diffusion coating, metal material coating process, coating and other directions, can solve the problem of high energy consumption, achieve the effect of reducing energy consumption, simple process and improving wear resistance

Active Publication Date: 2014-12-24
NORTHEASTERN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Higher working temperature and longer holding time will lead to higher energy consumption in the whole boronizing process; at the same time, higher requirements are put forward for the heating furnace (mostly silicon carbide heating elements are required)

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] This embodiment is carried out as follows:

[0030] Step 1. Prefabricated boronizing agent

[0031] Get the boron carbide powder with a purity of 93-97% produced by Mudanjiang Jinggong Abrasive Boron Carbide Co., Ltd. and the amorphous boron powder with a purity of 95% produced by Dandong Chemical Research Institute Co., Ltd., by mass percentage boron carbide 95%, boron Powder 5% ingredients, mixed evenly, through grinding and screening to make the particle size <45μm.

[0032] Step 2. Surface treatment of TA1 sample

[0033] (1) Degreasing

[0034] Mix the metal detergent and water to prepare a metal detergent solution with a concentration of 3%, raise the temperature to 55°C, immerse the TA1 sample in the metal detergent solution, soak for 2 hours to remove oil;

[0035] (2) washing

[0036] Soak the degreased TA1 sample in hot water at 50°C for 2 hours, and then rinse it twice with deionized water at room temperature;

[0037] (3) Surface grinding

[0038] Poli...

Embodiment 2

[0047] The steps of this example are basically the same as those of Example 1, except that the heating temperature in Step 3 is 950°C.

[0048] The TA1 sample after boronizing is detected and analyzed by X-ray diffraction analysis (XRD), and the permeating layer is mainly boride TiB and TiB 2, detected by scanning electron microscopy (SEM), the boronizing layer on the surface of the sample is well wedged with the substrate, without cracks and holes, and the friction coefficient of the sample surface is 0.15 to 0.25.

Embodiment 3

[0050] The steps of this example are basically the same as those of Example 1, except that the heating temperature in Step 3 is 1000°C.

[0051] The TA1 sample after boronizing is detected and analyzed by X-ray diffraction analysis (XRD), and the permeating layer is mainly boride TiB and TiB 2 , detected by scanning electron microscope (SEM), the boronizing layer on the surface of the sample is dense and well wedged with the substrate, and the friction coefficient of the sample surface is 0.15-0.25.

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PUM

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Abstract

The invention relates to a method for obtaining a boride diffusion layer on the surface of a titanium alloy. The method comprises the following steps: firstly, sequentially deoiling, washing, grinding, polishing and ultrasonically cleaning the surface of a titanium alloy material; and then boriding by virtue of a boriding medium which is prepared by mixing 92-98% by mass of boron carbide and 2-5% by mass of boron powder. The method can be used for obtaining a boride layer under the conditions of relatively low temperatures (900-1000 DEG C) and relatively low insulating times (2-5 hours). Not only can the wear resistance of the titanium alloy be remarkably improved, but also the energy consumption in the boriding process is low. The requirement on a heating furnace is not high, and the requirements can be satisfied by using a conventional FeCrAl resistance wire furnace.

Description

technical field [0001] The invention relates to metal surface treatment technology, in particular to a method for obtaining a boride diffusion layer on the surface of titanium alloy. Background technique [0002] As we all know, titanium alloys are widely used in aerospace, shipbuilding, chemical and biomedical fields due to their low density, high specific strength and excellent corrosion resistance. In recent years, the use of titanium alloys has been increasing, but due to its disadvantages such as low hardness and poor wear resistance, when used as sliding parts (such as valves and guide rods, piston pins and connecting rod shafts, etc.), it is easy to contact with the other parts. The abrasive material sticks and wears, which greatly limits its application range. Therefore, improving the hardness and wear resistance of titanium alloys has become an important research topic in this field. [0003] In order to improve the hardness and wear resistance of titanium alloys,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C8/68C23C8/02
Inventor 李凤华王丽娜周龙福何欢李英楠樊占国
Owner NORTHEASTERN UNIV