Preparation method of high-wear-resistance high-hardness titanium alloy composite sleeve

A composite casing, high wear resistance technology, applied in electrolytic coatings, surface reaction electrolytic coatings, coatings, etc., can solve problems such as unfavorable corrosion protection of substrates, inability to meet wear resistance, low coating hardness, etc. Achieve the effects of inhibiting the initiation of micro-cracks, high production efficiency, and obvious grain refinement

Inactive Publication Date: 2019-08-06
XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Micro-arc oxidation forms a ceramic film in situ on the surface of titanium alloy. The film layer and the substrate are firmly bonded, dense in structure, high in toughness, and has good wear resistance, high temperature and impact resistance. However, the main composition of the ceramic coating formed by micro-arc oxidation of titanium alloy is TiO 2 , the hardness of the coating is low, the surface of the micro-arc oxidation ceramic film is rough, loose and porous, thin in thickness, and poor in compactness, which is not conducive to the corrosion protection of the substrate, and cannot meet the demand for wear resistance under harsh conditions

Method used

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  • Preparation method of high-wear-resistance high-hardness titanium alloy composite sleeve
  • Preparation method of high-wear-resistance high-hardness titanium alloy composite sleeve
  • Preparation method of high-wear-resistance high-hardness titanium alloy composite sleeve

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Embodiment 1

[0024] The preparation method of the present embodiment comprises the following steps:

[0025] Step 1: Shot peening. The defects on the outer surface of the workpiece are firstly ground by means of grinder grinding and other methods, and then the visible dirt of the Ti-6Al-4V titanium alloy composite casing is removed, and then the outer surface of the titanium alloy composite casing is shot peened. Turn on the shot-peening start switch, and control the gas pressure at 0.4MPa, and the shot-peening time is 10min. Among them, DT1480 CNC shot blasting machine is used, and the projectile is cast steel shot ZG30, with a hardness of 55-65HRC and a diameter of 0.3mm.

[0026] Step 2: Perform surface pretreatment on the outer surface of the titanium alloy composite casing. Perform surface pretreatment on the shot peened in step one. The pretreatment process is as follows: 1) Turn on the switch of the ultrasonic generator, control the ultrasonic frequency to 30-40 kHz, and the ultr...

Embodiment 2

[0033] The preparation method of the present embodiment comprises the following steps:

[0034] Step 1: Shot peening. The defects on the outer surface of the workpiece are firstly ground by means of grinder grinding and other methods, and then the visible dirt of the Ti-6Al-4V titanium alloy composite casing is removed, and then the outer surface of the titanium alloy composite casing is shot peened. Turn on the shot peening start switch, and control the gas pressure at 0.4MPa, and the shot peening time is 20min. Among them, DT1480 CNC shot blasting machine is used, and the projectile is cast steel shot ZG30, with a hardness of 55-65HRC and a diameter of 0.3mm.

[0035] Step 2: Perform surface pretreatment on the outer surface of the titanium alloy composite casing. Perform surface pretreatment on the shot peened in step one. The pretreatment process is as follows: 1) Turn on the switch of the ultrasonic generator, control the ultrasonic frequency to 30-40 kHz, and the ultras...

Embodiment 3

[0042] The preparation method of the present embodiment comprises the following steps:

[0043] Step 1: Shot peening. The defects on the outer surface of the workpiece are firstly ground by means of grinder grinding and other methods, and then the visible dirt of the Ti-6Al-4V titanium alloy composite casing is removed, and then the outer surface of the titanium alloy composite casing is shot peened. Turn on the shot peening start switch, and control the gas pressure at 0.4MPa, and the shot peening time is 30min. Among them, DT1480 CNC shot blasting machine is used, and the projectile is cast steel shot ZG30, with a hardness of 55-65HRC and a diameter of 0.3mm.

[0044] Step 2: Perform surface pretreatment on the outer surface of the titanium alloy composite casing. Perform surface pretreatment on the shot peened in step one. The pretreatment process is as follows: 1) Turn on the switch of the ultrasonic generator, control the ultrasonic frequency to 30-40 kHz, and the ultr...

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Abstract

The invention discloses a preparation method of a high-wear-resistance high-hardness titanium alloy composite sleeve. The preparation method comprises the following steps that 1, shot blasting treatment is carried out on the outer surface of a conventional titanium alloy composite sleeve; 2, 2, pretreatment is carried out on the outer surface of the titanium alloy composite sleeve; 3, the titaniumalloy composite sleeve is fixed into a micro-arc oxidation groove set; 4, micro-arc oxidation treatment is carried out on the outer surface of the titanium alloy composite sleeve; 5, the outer surface of the titanium alloy composite sleeve obtained after micro-arc oxidation is cleaned and dried. An outer surface micro-arc oxidation coating of the titanium alloy composite sleeve adopting shot blasting is uniform and compact, the hardness of the surface layer of the sleeve is increased, and the titanium alloy composite sleeve has certain wear resistance and mechanical stability. According to the method, the conventional titanium alloy composite sleeve is subjected to shot blasting treatment and micro-arc oxidation treatment, and a protective layer high in hardness and resistant to wear andcorrosion is formed on the outer surface layer of the titanium alloy composite sleeve, so that the service life of the titanium alloy composite sleeve is prolonged, the production cost is reduced, andthe application of the technology in the field of oil and gas wells is further accelerated.

Description

technical field [0001] The invention belongs to the technical field of titanium alloy micro-arc oxidation surface treatment, and in particular relates to a preparation method of a titanium alloy composite casing with high wear resistance and high hardness. Background technique [0002] Titanium and titanium alloys have the characteristics of low density, good tensile strength, high specific strength, corrosion resistance, and good machinability, and are widely used in aviation, aerospace, navigation, metallurgy, chemical and medical fields. Titanium alloy composite casing is a pipe with a large diameter, which is used as the largest oil well special pipe in the process of oil exploitation. The working environment of the casing is very harsh. It is a complex system composed of gas, liquid and solid. Under the complex system, the surface of the titanium alloy composite casing is severely corroded. At the same time, the titanium alloy composite casing bears the tensile stress a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C25D11/26C22F1/18
CPCC22F1/183C25D11/024C25D11/026C25D11/26
Inventor 张聪惠胡坤魏娟茹何晓梅曾祥康
Owner XI'AN UNIVERSITY OF ARCHITECTURE AND TECHNOLOGY
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