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Method for preparing co-permeation layer on surface of TC4 titanium alloy through boro-carbonization method

A boron carbide and titanium alloy technology, applied in metal material coating process, coating, solid diffusion coating and other directions, can solve the problems of poor wear resistance, low hardness, etc., to reduce production costs, improve surface hardness, The effect of improving efficiency

Inactive Publication Date: 2020-04-07
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] Aiming at performance defects such as low surface hardness and poor wear resistance of TC4 titanium alloy, the purpose of the present invention is to provide a method for preparing a co-infiltration layer on the surface of TC4 titanium alloy by borocarburizing, that is, first infiltrating on the surface of TC4 titanium alloy After carbon pretreatment, boron carburizing is carried out, and a boron-based boron carburizing layer is prepared on the surface of TC4 titanium alloy to improve the surface hardness and wear resistance of TC4 titanium alloy while improving the brittle toughness of the carburizing layer, thereby expanding the TC4 The application range of titanium alloys extends its service life

Method used

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  • Method for preparing co-permeation layer on surface of TC4 titanium alloy through boro-carbonization method
  • Method for preparing co-permeation layer on surface of TC4 titanium alloy through boro-carbonization method
  • Method for preparing co-permeation layer on surface of TC4 titanium alloy through boro-carbonization method

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Experimental program
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preparation example Construction

[0043] Preparation of borocarburizing:

[0044] S201 (preparation of infiltration agent): Precisely configure the carburizing agent according to the composition ratio, and use a planetary ball mill to grind for 30 minutes to make the composition of the boron carburizing agent uniform;

[0045] S202 (furnace heating up): Put the infiltrating agent after the grinding of the above configuration into the corundum ark, put the TC4 titanium alloy sample that has been pre-carburized into the infiltrating agent, cover it, and put it into the heating area of ​​the tube furnace. Introduce argon gas into the tube furnace to ensure that the air is exhausted to form an argon atmosphere protection. After the argon atmosphere is stable, start heating to 850~1150℃ and keep it warm for 8~12h.

[0046] S203 (cooling and sampling): after the heat preservation is over. Cool to room temperature with the furnace, take out the sample, ultrasonically clean it for 10 minutes, and dry it for later use...

Embodiment 1

[0049] The invention provides a method for preparing a co-infiltration layer on the surface of a TC4 titanium alloy by boron-carburizing, comprising the following steps:

[0050] Carburizing pretreatment:

[0051] S101 (sample preparation): prepare a TC4 titanium alloy, and process it into a sample with a size of 15×15×4 mm by wire cutting. Then use 180#, 280#, 320#, 400#, 500#, 600#, 800# sandpaper to grind the substrate sample step by step, and then use a mechanical polishing machine to polish the polished sample. Until the surface becomes a mirror surface without obvious scratches, put it into a beaker containing absolute ethanol for ultrasonic cleaning for 10 minutes, and place it in an alcohol bottle for later use;

[0052] S102 (Furnace heating): Embed the dried TC4 sample in the carburizing agent and place it in the corundum ark with a cover to ensure that the sample will not have direct contact with the corundum ark, and place it in the heating area of ​​the tube furn...

Embodiment 2

[0059] The invention provides a method for preparing a co-infiltration layer on the surface of a TC4 titanium alloy by boron-carburizing, comprising the following steps:

[0060] Carburizing pretreatment:

[0061] S101 (sample preparation): prepare a TC4 titanium alloy, and process it into a sample with a size of 15×15×4 mm by wire cutting. Then use 180#, 280#, 320#, 400#, 500#, 600#, 800# sandpaper to grind the substrate sample step by step, and then use a mechanical polishing machine to polish the polished sample. Until the surface becomes a mirror surface without obvious scratches, put it into a beaker containing absolute ethanol for ultrasonic cleaning for 10 minutes, and place it in an alcohol bottle for later use;

[0062] S102 (Furnace heating): Embed the dried TC4 sample in the carburizing agent and place it in the corundum ark with a cover to ensure that the sample will not have direct contact with the corundum ark, and place it in the heating area of ​​the tube furn...

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Abstract

The invention discloses a method for preparing a co-permeation layer on the surface of a TC4 titanium alloy through a boro-carbonization method. The method comprises the steps that S1, preparing a carburized layer on the surface of the TC4 titanium alloy through the powder pack cementation technology, and forming a TiC deposition layer rich in carbon atoms on the surface of the TC4 titanium alloy;S2, preparing a boron-carbon co-permeation layer on the surface of the TC4 subjected to carburization pretreatment by adopting the powder pack cementation technology, wherein the thickness of the boron-carbon co-permeation layer is about 20-40 [mu]m, and the hardness of the boron-carbon co-permeation layer obtained through the carburization pretreatment can reach 2487.5 HV-2865.3 HV, which is 8-10 times of that of a TC4 titanium alloy matrix, and wear resistance and the service life of the boron-carbon co-permeation layer are greatly improved. The prepared boron-carbon co-permeation layer hasthe advantages of being thick in permeation layer, small in brittleness, high in hardness and resistant to wear; and the preparation method has the advantages of being high in permeation speed, low in cost, simple in process, small in workpiece deformation and the like and can be widely applied to the working condition environment with high wear resistance and service life requirements.

Description

technical field [0001] The invention belongs to the field of TC4 titanium alloy surface treatment, and in particular relates to a method for preparing a co-infiltration layer on the surface of a TC4 titanium alloy by a borocarburizing method. Background technique [0002] TC4 titanium alloy is a kind of α+β titanium alloy. It is widely used in aviation, aerospace, chemical industry, shipbuilding, biomedicine and other fields due to its high specific strength, low density and high thermal strength. It is currently the most widely used at home and abroad. A titanium alloy. However, with the progress of the times, the volume of mechanical parts continues to shrink, and the requirements for hardness, wear resistance, and corrosion resistance continue to increase. Due to its low hardness, poor wear resistance and other defects, TC4 titanium alloy is difficult to meet the current and future requirements. skills requirement. With an economical and effective method, it is immine...

Claims

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Application Information

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IPC IPC(8): C23C8/72C23C8/78
CPCC23C8/72C23C8/78
Inventor 梁文萍黄朝军缪强张毅李阳易锦伟林浩丁铮孙自旺赵子龙
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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