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Biphase boron-titanium composite layer

A composite layer, boron-titanium technology, applied in the field of wear-resistant infiltration layer, can solve the problems of low efficiency, coarse structure, difficult phase control, etc., and achieve the effect of improving deposition quality

Active Publication Date: 2019-05-03
BEIJING MINING & METALLURGICAL TECH GRP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The in-situ modification of titanium alloy can make there is no obvious interface between the surface modification layer and the substrate, and can process specific structural parts with complex structures. The metallurgical combination of the modified layer and the substrate can significantly improve the bonding force. In many modification methods Among them, the boronizing method does not require special equipment, is simple to operate, and is easy to promote. It can obtain an in-situ metallurgically bonded boron-titanium compound layer on the surface of the titanium alloy substrate, but the thickness of the boronizing layer is thin, the efficiency is low, and the phase is not easy to control. The growth direction of the boronizing layer is relatively random. In order to improve this problem, the present invention obtains a boron-titanium composite layer with adjustable thickness and directional growth by adjusting the appropriate process combination.
[0004] Under normal circumstances, boronizing time and thickness are positively correlated, but higher working temperature and longer holding time will make the whole boronizing process consume more energy, and long-term holding time will easily make the structure thicker, making the The thickness and performance of the composite coating will be limited, which in turn will limit the application of the coating

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] This embodiment provides a dual-phase boron-titanium composite layer, which is prepared in the following manner:

[0040] Step 1) Surface treatment of titanium alloy substrate

[0041] 1) Degreasing: Mix the metal detergent and water to prepare a solution with a concentration of 5%, raise the temperature to 58°C, immerse the titanium alloy substrate in the metal detergent solution, soak for 1.5 hours to remove oil;

[0042] 2) Surface grinding: the surface of the washed titanium alloy substrate is sequentially polished with 400#, 600#, 800#, 1000#, 1200#, 1500#, 2000# water-grinding sandpaper;

[0043] 3) Ultrasonic cleaning: first use acetone as a cleaning agent, and use an ultrasonic cleaning machine to clean the surface-polished titanium alloy substrate at room temperature for 40 minutes; then use deionized water as a cleaning agent, and use ultrasonic cleaning for 40 minutes;

[0044] 4) Plasma cleaning: place the titanium alloy substrate in a PVD device, evacuate ...

Embodiment 2

[0056] This embodiment provides a dual-phase boron-titanium composite layer, which is specific to that of Embodiment 1 only in that:

[0057] In step 4), "heat to 960°C" is replaced with "heat to 980°C".

[0058] The TC4 sample after boronizing is detected by scanning electron microscope (SEM). The thickness of the boronizing layer is 50-65um. The boronizing layer on the surface of the sample is dense, well wedged with the substrate, and the growth direction is perpendicular to the substrate.

Embodiment 3

[0060] This embodiment provides a dual-phase boron-titanium composite layer, which is specific to that of Embodiment 1 only in that:

[0061] Use "cold spray" to replace "PVD method" to deposit pure titanium layer;

[0062] Specifically: the process conditions of cold spraying pure titanium prefabricated layer: nitrogen pressure (40~60bar), flow rate (80~95 cubic meters / minute), temperature (950~1100 degrees Celsius), powder feeding amount (50~70g / min) , Carrier gas pressure (5~20bar), carrier gas flow rate (1~9 cubic meters / min), spraying distance (15~35mm).

[0063] The TC4 sample after boronizing is detected by scanning electron microscope (SEM). The thickness of the boronizing layer is 60-80um. The boronizing layer on the surface of the sample is dense and well wedged with the substrate, and the growth direction is mostly perpendicular to the substrate.

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Abstract

The invention relates to a biphase boron-titanium composite layer. The biphase boron-titanium composite layer is based on a titanium alloy substrate, and the surface layer is coated with a pre-formedlayer, wherein the ore-formed layer can be grown into a TiBX composite layer. By means of the biphase boron-titanium composite layer, the wear resistance of a titanium alloy is greatly improved to withstand higher loads, and the reliability for stable application of a lightweight titanium alloy under more severe conditions is provided. The biphase boron-titanium composite layer can be ideally applied to high temperature and high speed erosion resistant materials.

Description

technical field [0001] The invention relates to the field of wear-resistant infiltration layers, in particular to a dual-phase boron-titanium composite layer. Background technique [0002] Titanium alloys are widely used in aerospace, chemical and biomedical fields due to their high specific strength, low density and good biocompatibility, and have also become one of the materials of choice for lightweight development. , poor wear resistance, and rapid degradation at high temperatures are the main obstacles that limit the application of titanium alloys in lightweighting. [0003] The compound TiB formed due to the reaction of Ti and B X It not only has the characteristics of high melting point, high hardness and high strength of ceramic materials, but also has excellent properties such as high thermal conductivity of metal materials, which can significantly improve the surface properties of titanium alloys such as wear resistance and high temperature oxidation resistance. T...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/16C23C14/58C23C8/68C23C24/04C23C18/31
Inventor 衣晓红于月光沈婕王玉袁建鹏刘安强
Owner BEIJING MINING & METALLURGICAL TECH GRP CO LTD
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