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Composite coating for titanium alloy gasket and preparation method thereof

A composite coating and titanium alloy technology, applied in metal material coating process, coating, fusion spraying, etc., can solve the problem that cannot meet the requirements of titanium alloy gasket for large load assembly, tensile strength, compressive strength and wear resistance Poor properties such as resistance, poor mechanical properties of the insulating protective layer, etc., to achieve good high temperature resistance, avoid galvanic corrosion, and good wear resistance

Pending Publication Date: 2021-12-07
725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The insulating protective layer prepared on the surface of titanium alloy by the above method has the problem of poor mechanical properties, mainly manifested in poor tensile strength, compressive strength, wear resistance, etc., which cannot meet the requirements for large-load assembly and use of titanium alloy gaskets. , at the same time, the protective layer mainly composed of organic matter has poor anti-aging performance and is prone to failure in the marine environment
At present, there is no invention patent for spraying insulating, wear-resistant and corrosion-resistant composite coatings on the surface of titanium alloy gaskets to solve the above problems

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] A preparation method for a composite coating for a titanium alloy gasket, mainly comprising the following steps:

[0029] S1. Surface cleaning

[0030] Clean the surface of the titanium alloy gasket with acetone and absolute ethanol to remove oil and ensure the surface of the gasket is clean;

[0031] S2, sandblasting roughening

[0032]Use 16-mesh and 24-mesh mixed brown corundum sand grains with a mass ratio of 1:1~3:1 to roughen the surface by sandblasting. The compressed air used for sandblasting must be dry and oil-free, with an air pressure of 0.6~0.8MPa and a spray angle of 90±10°, the sandblasting distance is 0.1~0.2m, until the surface of the titanium alloy gasket reveals a matte fresh metal surface;

[0033] S3, coating preparation

[0034] S31. Fix the titanium alloy gasket on the spraying tool, and prepare a nickel-based metal transition layer on the surface of the titanium alloy gasket by supersonic flame spraying process, with a thickness of 0.06mm. The...

Embodiment 1

[0040] A preparation method for a composite coating for a titanium alloy gasket, mainly comprising the following steps:

[0041] S1. Surface cleaning

[0042] Clean the surface of the titanium alloy gasket with acetone and absolute ethanol to remove oil and ensure the surface of the gasket is clean;

[0043] S2, sandblasting roughening

[0044] Use 16-mesh and 24-mesh mixed brown corundum sand particles with a mass ratio of 3:1 to roughen the surface by sandblasting; the compressed air used for sandblasting must be dry and oil-free, the pressure is 0.7MPa, the spray angle is 90°, and the sandblasting distance is 0.15m , sandblasting until the surface of the titanium alloy gasket reveals a matte fresh metal surface;

[0045] S3, coating preparation

[0046] S31. The material used for the nickel-based metal transition layer is spherical spray powder containing 75% Ni, 15% Cr, and 10% Mo. The spraying process is air pressure 0.8MPa, propane pressure 0.68MPa, powder feeding spe...

Embodiment 2

[0052] A preparation method for a composite coating for a titanium alloy gasket, mainly comprising the following steps:

[0053] S1. Surface cleaning

[0054] Clean the surface of the titanium alloy gasket with acetone and absolute ethanol to remove oil and ensure the surface of the gasket is clean;

[0055] S2, sandblasting roughening

[0056] Use 16-mesh and 24-mesh mixed brown corundum sand particles with a mass ratio of 2:1 to roughen the surface by sandblasting; the compressed air used for sandblasting must be dry and oil-free, the pressure is 0.65MPa, the spray angle is 90°, and the sandblasting distance is 0.1m , sandblasting until the surface of the titanium alloy gasket reveals a matte fresh metal surface;

[0057] S3, coating preparation

[0058] S31. The material used for the nickel-based metal transition layer is spherical spray powder containing Ni80%, Cr12%, and Mo8%. The angle is 90°, the spraying speed is 500mm / s, the step distance is 3.2mm, the preheating ...

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Abstract

The invention discloses a composite coating for a titanium alloy gasket and a preparation method thereof. The composite coating is composed of a nickel-based metal transition layer with the thickness of 0.06mm and a ceramic surface layer with the thickness of 0.3-0.4 mm. The nickel-based metal transition layer comprises, by mass, 60-85% of Ni, 10-30% of Cr, 3-6% of B, 3-6% of Si, 2-5% of Fe and 2-5% of Mo. The ceramic surface layer comprises, by mass, 70-90% of Al2O3, 15-30% of TiO2 and 3-10% of ZrO2. The preparation method of the composite coating comprises the steps that firstly, oil stains, impurities and the like on the surface of the titanium alloy gasket are removed in a surface cleaning and compressed air sand blasting roughening mode; and then a uniform and compact insulating, wear-resistant and corrosion-resistant composite coating is prepared through a supersonic flame spraying technology and a high-speed plasma spraying technology, so that the insulating, wear-resistant and corrosion-resistant characteristics of the titanium alloy gasket are improved, contact potential is isolated, galvanic corrosion is avoided, and accordingly the sealing reliability of pipeline system equipment and accessories is improved.

Description

technical field [0001] The invention relates to the field of thermal spraying coatings, in particular to a composite coating for a titanium alloy gasket and a preparation method thereof. Background technique [0002] Washer refers to the part between the connected part and the nut. The washer is generally a flat metal ring, and the commonly used materials are stainless steel, tool steel, etc. Ship piping system equipment and accessories require a large number of metal gaskets during installation and use. Ordinary stainless steel gaskets and tool steel gaskets have poor corrosion resistance and short service life in marine environments, which cannot meet the needs of equipment use. Titanium has the characteristics of high specific strength, good heat resistance, and excellent corrosion resistance. Compared with ordinary gaskets, titanium alloy gaskets have stronger corrosion resistance in marine environments, so they are widely used in the sealing connection of ship piping sy...

Claims

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Application Information

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IPC IPC(8): C23C4/129C23C4/06C23C4/134C23C4/10
CPCC23C4/129C23C4/06C23C4/134C23C4/10
Inventor 许康威武笑宇谢述锋景喆黄磊
Owner 725TH RES INST OF CHINA SHIPBUILDING INDAL CORP
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