Test device and method for measuring residual stress of coating

A technology of residual stress and test equipment, applied in the direction of measuring equipment, measuring force, instruments, etc., can solve problems such as uneven organization and structure

Active Publication Date: 2014-07-16
BEIJING UNIV OF TECH
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Problems solved by technology

It should be pointed out that the above measurements of the residual stress of the coating are based on the calculation of the overall coating after the coating is prepared. Due to the change of the structure during the preparation of the ceramic coating, there are differences between the structure and the thickness in the thickness direction. Due to the inhomogeneity of the structure, it is urgent to clarify and develop the stress evolution during the spraying process to provide guidance for the development of efficient and high-quality thermal spraying processes

Method used

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  • Test device and method for measuring residual stress of coating
  • Test device and method for measuring residual stress of coating
  • Test device and method for measuring residual stress of coating

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Embodiment Construction

[0070] Below, the substrate is Ti-6Al-4V (TC4) plate, and the coating is ZrO 2 Taking powder as an example, this method is further described in detail:

[0071] 1. The substrate material is Ti-6Al-4V (TC4) plate, and the plate size is 200mm×15mm×2mm. The powder is ZrO 2 Powder (5~60μm).

[0072] 2. Before spraying, clean the substrate with acetone and roughen it with 10-30 mesh corundum under a pressure of 0.5 MPa, and then clean the surface.

[0073] 3. One end of the specimen is clamped on the clamp.

[0074] 4. Here, the contact displacement sensor is placed on the unclamped end of the sample, and the contact temperature sensor is placed on the clamped end of the sample.

[0075] 5. Through the test circuit, in the computer, collect and record the changes of displacement and temperature data.

[0076] 6. Use a plasma spray gun to carry out plasma spraying on the surface of the sample, and go back and forth 3 times. Record the data.

[0077] 7. By the data obtained, a...

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Abstract

The invention relates to a test device and method for measuring residual stress of a coating, and belongs to the field of thermal spraying. Curvature changes of the coating and a base body in the spraying process are measured on line, internal stress of the coating in the manufacturing process is calculated within an elastic scope, and the final residual stress of the coating is obtained. A sample to be sprayed is fixed at one end, wherein the clamping end is the B end, and the other end is the A end; then the surface of the sample is sprayed with a plasma spraying method, and the coating is formed. In the spraying process, due the temperature is uneven or the physical property of materials is coincident, the internal stress is generated between the coating and the base body of the sample. Displacement at an A point is measured through a displacement sensor fixed at the A end of the sample, and the curvature change of the sample is accordingly obtained. Temperature changes of the sample in the deposition stage and the cooling stage in the spraying process are measured. The elasticity modulus of the ceramic coating is reversely obtained according to the curvature changes of the coating and the base body, and the stress evolution in the coating manufacturing process and residual stress values of the manufactured coating are reversely obtained.

Description

1. Technical field [0001] The invention belongs to the field of thermal spraying, and in particular relates to a method for collecting and analyzing residual stress data through a non-destructive physical method such as a curvature method and a related device thereof. 2. Background technology [0002] Ceramic coatings have many advantages such as high temperature resistance, good high temperature oxidation resistance, wear resistance, and corrosion resistance. The preparation of ceramic coatings on the surface of metal or alloy materials can effectively optimize the performance of metals, making the strength and toughness of metals comparable to ceramic materials. Combining many advantages of the composite material to meet people's use conditions. Among many coating preparation methods, thermal spraying is a widely used method. It has many advantages, such as: there are many materials available for spraying, the size of the sprayed components is not limited, and the spraying...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G01L1/00
Inventor 李辉杨天龙郭天旭栗卓新魏琪
Owner BEIJING UNIV OF TECH
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