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Preparation method of residual stress sensitive coating modified through graphene

A graphene modification and residual stress technology, applied in coatings, chemical instruments and methods, metal material coating processes, etc., can solve problems such as inability to obtain stress distribution, and achieve the goal of monitoring coating integrity and safe service conditions. Effect

Active Publication Date: 2017-11-24
AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Ultrasonic testing technology is a non-destructive testing method, which has the advantages of strong penetrating power and good sound beam directionality. However, the result of ultrasonic testing stress is the average value of ultrasonic waves passing through a certain path inside the sample. Although it is not destructive, it cannot Get the stress distribution of the structure as a whole
Therefore, so far there is no technology suitable for non-destructive, online, real-time monitoring of coatings on remanufactured parts by thermal spraying.

Method used

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  • Preparation method of residual stress sensitive coating modified through graphene
  • Preparation method of residual stress sensitive coating modified through graphene
  • Preparation method of residual stress sensitive coating modified through graphene

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] The invention provides a method for preparing a graphene-modified residual stress-sensitive coating, which comprises the following steps: step (1) weigh 30g of strontium carbonate (CaCO 3 ), 20g of alumina (Al 2 o 3 ), 10g silicon dioxide (SiO 2 ), weigh 500ml of alcohol, and place the mixed powder and alcohol in a planetary ball mill for ball milling and mixing for 70 minutes until the alcohol is completely volatilized. Then it was transferred to a corundum boat and treated in a high-temperature furnace at a temperature of 940 °C for 4 h.

[0038] Step (2) Weigh 1 g of graphene oxide and disperse it in 300 ml of absolute ethanol with ultrasonic vibration to prepare graphene oxide dispersion. The ultrasonic dispersion time is 120min, and the ultrasonic frequency is 15Hz.

[0039] Step (3) weigh 2g europium oxide (Eu 2 o 3 ) and 1g dysprosium oxide (Dy 2 o 3 ), add 300ml of dilute hydrochloric acid to dissolve, and add 300ml of distilled water at the same time, a...

Embodiment 2

[0048] On the basis of the above examples, the steps of this example are: step (1) weigh 60g of strontium carbonate (CaCO 3 ), 30g of alumina (Al 2 o 3 ), 20g silicon dioxide (SiO 2 ), weigh 1000ml of alcohol, and place the mixed powder and alcohol in a planetary ball mill for ball milling and mixing for 80 minutes until the alcohol is completely volatilized. Then it was transferred to a corundum boat and treated in a high-temperature furnace at a temperature of 1000 °C for 5 h.

[0049] Step (2) Weigh 2 g of graphene oxide and disperse it in 600 ml of absolute ethanol with ultrasonic vibration to prepare graphene oxide dispersion. The ultrasonic dispersion time is 140min, and the ultrasonic frequency is 15Hz.

[0050] Step (3) weigh 4g europium oxide (Eu 2 o 3 ) and 2g dysprosium oxide (Dy 2 o 3 ), add 600ml of dilute hydrochloric acid to dissolve, and add 600ml of distilled water at the same time, and stir evenly with a high-speed mixer at a speed of 500rpm / min for 7...

Embodiment 3

[0056] On the basis of the above examples, the steps of this example are: step (1) weigh 80g of strontium carbonate (CaCO 3 ), 60g of alumina (Al 2 o 3 ), 20g silicon dioxide (SiO 2 ), weigh 1000ml of alcohol, place the mixed powder and alcohol in a planetary ball mill for ball milling and mixing for 90 minutes, until the alcohol is completely volatilized. Then it was transferred to a corundum boat and treated in a high-temperature furnace at a temperature of 1040 °C for 7 h.

[0057] Step (2) Weighing 4 g of graphene oxide and dispersing it in 1000 ml of absolute ethanol with ultrasonic vibration to prepare a graphene oxide dispersion. The ultrasonic dispersion time is 160min, and the ultrasonic frequency is 15Hz.

[0058] Step (3) weigh 3g europium oxide (Eu 2 o 3 ) and 1.5g dysprosium oxide (Dy 2 o 3 ), add 600ml of dilute hydrochloric acid to dissolve, and add 600ml of distilled water at the same time, and stir evenly with a high-speed mixer at a speed of 500rpm / mi...

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Abstract

The invention provides a preparation method of a residual stress sensitive coating modified through graphene. The preparation method comprises the steps that (1) strontium carbonate (CaCO3), aluminum oxide (Al2O3), silicon dioxide (SiO2) and alcohol are weighed and mixed; (2) graphene oxide is dispersed in absolute ethyl alcohol; (3) dilute hydrochloric acid is used for dissolution, and meanwhile, a certain amount of distilled water is added; (4) modification and element regulation and control of Dy3+ / Eu3+ are achieved through the graphene, and finally / Dy3+ / Eu3+ powder modified through the graphene is obtained through drying in the vacuum atmosphere; (5) CaAl2Si2O8:Eu3+, Dy3+ powder which has the powder particle size of about 1-3 [mu]m and modified through the graphene is obtained through screening; and (6) a graphene co-doped Dy3+ / Eu3+ WC-CO powder material with a certain particle size is obtained, and a visual SrAl2O4:Eu3+, Dy3+co-doped WC-CO abrasion-resistant coating is prepared through the thermal spraying technique. By the adoption of the scheme, the particle sizes of spraying materials are uniform, the purity is high, the graphene content in the powder is high, and the preparation method can be used for preparing the residual stress sensitive coating through the thermal spraying technique.

Description

technical field [0001] The invention belongs to the preparation of graphene-modified CaAl applied to thermal spraying technology 2 Si 2 o 8 :Eu 3+ , Dy 3+ The technical field of co-doped WC-Co residual stress-sensitive coating, especially relates to a method for preparing a graphene-modified residual stress-sensitive coating. Background technique [0002] The preparation of wear-resistant coatings by thermal spraying is one of the main technologies applied in remanufacturing engineering. It can be used not only to improve the surface wear resistance of new parts, but also to repair the geometric dimensions of failed parts, giving waste parts a new life cycle, It saves energy and material waste caused by manufacturing new products, and has wide application potential in high-tech engineering fields such as aerospace, petrochemical, and nuclear power plants. [0003] Wear-resistant coatings generally serve for a long time under harsh working conditions such as high loads a...

Claims

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Application Information

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IPC IPC(8): C23C4/06C09K11/65C09K11/64
CPCC09K11/65C09K11/7792C23C4/06
Inventor 田浩亮张欢欢王长亮郭孟秋汤智慧崔永静高俊国周子民
Owner AVIC BEIJING INST OF AERONAUTICAL MATERIALS
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