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Laser repairing method for repairing cracks of ultrahigh temperature ceramic coating on C/C composite material

A technology of ultra-high temperature ceramics and composite materials, applied in the field of laser surface engineering, can solve problems such as coating defects, and achieve the effects of low cost, rapid processing and simple process operation

Inactive Publication Date: 2020-04-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] In order to avoid the deficiencies of the prior art, the present invention proposes a laser repair method for cracks in the ultra-high temperature ceramic coating of C / C composite materials, which solves the problem of local defects in the ultra-high temperature ceramic coating and overcomes the shortcomings of the traditional coating preparation process

Method used

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  • Laser repairing method for repairing cracks of ultrahigh temperature ceramic coating on C/C composite material
  • Laser repairing method for repairing cracks of ultrahigh temperature ceramic coating on C/C composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] 1) Cut the C / C composite material to obtain a long sample with a size of 45×8×4 mm, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it for later use. Using Si powder, C powder and ZrC powder as raw materials, SiC-ZrC-Al was prepared on the surface of C / C composite materials by embedding method 2 o 3 coating. A three-point bending static test was carried out on the coated C / C composite material to obtain samples with cracks distributed on the surface (such as figure 1 shown) for the subsequent repair of the main crack.

[0027] 2) Confirm the location of the main crack on the surface of the coating. First, use a file to groove the location, and then use 180# and 320# sandpaper to polish it respectively. Be careful not to damage the C / C substrate during grooving and grinding, and then The sample was ultrasonically cleaned with absolute ethanol for 30 min, and dried in an oven.

[0028] 3) The powder used for repair is made of Al 2 o 3 (300...

Embodiment 2

[0031] 1) Cut the C / C composite material to obtain a long sample with a size of 45×8×4 mm, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it for later use. Using Si powder, C powder and ZrC powder as raw materials, SiC-ZrC-Al was prepared on the surface of C / C composite materials by embedding method 2 o 3 coating. A three-point bending static test was carried out on the coated C / C composite material to obtain a sample with cracks on the surface, so as to repair the main cracks later.

[0032]2) Confirm the location of the main crack on the surface of the coating. First, use a file to groove the location, and then use 180# and 320# sandpaper to polish it respectively. Be careful not to damage the C / C substrate during grooving and grinding, and then The sample was ultrasonically cleaned with absolute ethanol for 30 min, and dried in an oven.

[0033] 3) The powder used for repair is made of Al 2 o 3 (300 mesh) and ZrO 2 (300 mesh) powder composi...

Embodiment 3

[0036] 1) Cut the C / C composite material to obtain a long sample with a size of 45×8×4 mm, ultrasonically clean it with absolute ethanol for 30 minutes, and then dry it for later use. Using Si powder, C powder and ZrC powder as raw materials, SiC-ZrC-Al was prepared on the surface of C / C composite materials by embedding method 2 o 3 coating. A three-point bending static test was carried out on the coated C / C composite material to obtain a sample with cracks on the surface, so as to repair the main cracks later.

[0037] 2) Confirm the location of the main crack on the surface of the coating. First, use a file to groove the location, and then use 180# and 320# sandpaper to polish it respectively. Be careful not to damage the C / C substrate during grooving and grinding, and then The sample was ultrasonically cleaned with absolute ethanol for 30 min, and dried in an oven.

[0038] 3) The powder used for repair is made of Al 2 o 3 (300 mesh) and ZrO 2 (300 mesh) powder compos...

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Abstract

The invention relates to a laser repairing method for repairing the cracks of an ultrahigh temperature ceramic coating on a C / C composite material. At first, the cracks on the surface of a SiC-ZrC-Al2O3 coating are preprocessed; and then a laser cladding technology is adopted to effectively fill the cracks by an Al2O3 / ZrO2 dual oxide eutectic ceramic coating so as to repair the cracks. The laser cladding method is used to prepare the Al2O3 / ZrO2 dual oxide eutectic ceramic coating locally, and has the advantages that (1) the cracks in the original coating can be fulfilled effectively, the service life of a sample is prolonged, and the disastrous complete failure is avoided; and (2) the eutectic ceramic coating generated by a laser direction solidification technology has an excellent anti-oxidation performance and excellent high temperature mechanical properties, and well protects a C / C composite material. Compared with other repairing method, the technology has the advantages of simpleoperation, rapid processing, precise control, few required materials, and low cost, and is accord with the green and energy saving trends.

Description

technical field [0001] The invention belongs to the technical field of laser surface engineering, and relates to a laser repair method for cracks in a C / C composite material ultra-high temperature ceramic coating. Background technique [0002] Carbon / carbon (C / C) composite materials have excellent characteristics such as light weight and high strength, and the mechanical strength does not decrease but increases with the increase of temperature. It is one of the very few materials that can adapt to high temperatures above 2000 ° C. Huge application prospects. However, C / C composites are extremely prone to oxidation in high-temperature aerobic environments, resulting in damage to their mechanical properties and greatly limiting their application range. Ultra-high temperature anti-oxidation coating technology is the preferred way to solve this problem. [0003] In a complex service environment, components are often damaged by coupled environments such as oxidation, ablation, a...

Claims

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Application Information

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IPC IPC(8): C04B41/87
CPCC04B41/0036C04B41/009C04B41/4545C04B41/5042C04B41/87C04B41/5031C04B35/83
Inventor 王翰辉李贺军史小红刘雪松
Owner NORTHWESTERN POLYTECHNICAL UNIV
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