Titanium alloy gear with ferroboron diffusion layer on surface and co-diffusion method thereof

A technology of boron-iron alloys and titanium alloys, which is applied to elements with teeth, belts/chains/gears, metal material coating processes, etc., can solve the problems of complex preparation methods of titanium alloy gears, poor surface wear resistance of titanium alloys, hydrogen atoms, etc. Easy to infiltrate and other problems, achieve process optimization, good wear resistance, and improve surface properties

Inactive Publication Date: 2013-06-12
TAIYUAN UNIV OF TECH
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  • Abstract
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AI Technical Summary

Problems solved by technology

However, the surface of titanium alloy has poor wear resistance and is prone to adhesion, and it is easy to bite with the mating pair during use, which limits its practical application on gears
[0004] The existing publication number is CN101798667A, which discloses a "hardened titanium structure for transmission gear applications", but the preparation method of titanium alloy gears with this hardened titanium structure is complicated, difficult, and difficult for practical application
However, the traditional carburizing process, which is widely used in the surface treatment of gears, is not suitable for the surface treatment of titanium alloy gears. On the other hand, during the carburizing process, hydrogen atoms can easily penetrate into the inner layer of the titanium alloy gear surface, causing hydrogen embrittlement under impact conditions

Method used

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  • Titanium alloy gear with ferroboron diffusion layer on surface and co-diffusion method thereof
  • Titanium alloy gear with ferroboron diffusion layer on surface and co-diffusion method thereof

Examples

Experimental program
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Embodiment l

[0026] Plasma boronizing technology is used to form a boron-iron diffusion layer on the surface of gears made of Ti6Al4V alloy (α+β titanium alloy). The source electrode 3 composed of FeB and the Ti6Al4V gear are placed on the same cathode tray 1, the gear is centered, the source electrode is outside, and the distance between the two is 25 mm. Vacuumize to less than 1Pa, fill with argon to raise the pressure to 45Pa, apply a voltage of -690V between the cathode tray 1 and the vacuum container 4, so that the gear temperature rises to 850°C, keep the temperature for 3 hours, and slowly cool to room temperature with the furnace Serve.

[0027] The titanium alloy gear formed through the above process is still a Ti6Al4V alloy composed of α+β phase. The surface layer of each part of the gear tooth is a uniformly distributed iron-boroned layer with a thickness of 0.02mm. The boron content on the surface is 10.4%. The iron content is 20.3%, and the alloy element content gradually dec...

Embodiment 2

[0029] The boron-iron diffusion layer is formed on the surface layer of the gear made of Ti6Al4V alloy material by plasma boronizing technology. The source electrode 3 composed of FeB and the Ti6Al4V gear are placed on the same cathode tray 1, the gear is centered, the source electrode is outside, and the distance between the two is 25mm. Vacuumize to less than 1Pa, fill with argon to raise the pressure to 45Pa, apply a voltage of -780V between the cathode tray 1 and the vacuum container 4, and raise the temperature of the gear to 950°C, keep it warm for 10 hours, and slowly cool to room temperature with the furnace Serve.

[0030] The titanium alloy gear formed through the above process is still a Ti6Al4V alloy composed of α+β phase. The surface layer of each part of the gear tooth is a uniformly distributed iron-boroned layer with a thickness of 0.09mm. The boron content on the surface is 11.3%. The iron content is 28.6%, and the alloy element content gradually decreases fr...

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Abstract

The invention relates to a titanium alloy gear with a ferroboron diffusion layer on the surface and a co-diffusion method thereof. The method comprises the step of: by taking a titanium alloy gear as a workpiece and taking iron boride as a source, placing the titanium alloy gear and the iron boride on a negative disk to form a workpiece-source integral structure, wherein the negative electrode of a direct current power supply is connected to the negative disk, and the positive electrode of the direct current power supply is connected to a vacuum container; vacuumizing and introducing argon, applying a direct-current voltage to generate hollow negative glow discharge, migrating, adsorbing and spreading the sputtered boron, iron ion, atoms and particles into the gear to form an alloy layer, preserving the heat, slowly cooling to room temperature, thereby obtaining the titanium alloy gear with the ferroboron diffusion layer. The method disclosed by the invention is advanced in process and low in cost; and the prepared gear is strong in seizure resistance, good in wear resistance and long in service life.

Description

technical field [0001] The invention relates to a titanium alloy gear, and also relates to a method for boron-iron co-infiltration on the surface of the titanium alloy gear by adopting a plasma infiltration plating technology. Background technique [0002] Gear is a key part of mechanical equipment. It must have both excellent wear resistance and high contact fatigue resistance. The quality of the gear is directly related to the service life of the entire equipment. [0003] Traditional gear materials are mainly alloy steels such as 20CrMnTi, 18Cr2Ni4WA, 15CrMn2SiMo, etc. Carburizing and heat treatment processes are used to improve the comprehensive mechanical properties of gear impact toughness, fatigue strength and surface hardness. Compared with steel alloys, titanium alloys have the advantages of high specific strength, low density, small weight, strong oxidation resistance and creep resistance, etc. From these aspects, it is one of the preferred materials for gear mater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C12/02F16H55/17F16H55/06
Inventor 秦林姚晓红武晶晶唐宾
Owner TAIYUAN UNIV OF TECH
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