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Anti-oxidation and heat-insulating ceramic coating and preparation method thereof

A ceramic coating and anti-oxidation technology, which is applied in the coating, metal material coating process, ion implantation plating, etc., can solve the problems of thermal barrier coating protection failure, easy peeling of the coating, etc., and achieve good oxidation resistance , reduced growth rate, large strain tolerance and thermal insulation effects

Active Publication Date: 2020-08-14
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

This patented technical solution described in this patents allows for an antioxidant or heat-resistant ceramics (Cerroxy®) coatings made up of specific layers like alpha -Al2O3, beta -Si02, etc., create strong protective films against corrosives such as water immersion and acid rain while maintaining their properties during use. These coatings are formed through various methods including chemical reaction sintering techniques, atomic layer depositions, electroplated nickel metallization, and solid state redox chemistry. Overall these improvements improve durability and reduce stress levels over time compared to traditional materials.

Problems solved by technology

This patents discusses various technical problem addressed during manufacturing processes used in advanced gas turbine engines such as those involving heat management systems like air conditioners due to their exposure to severe environments where they may be subjected to temperatures above 350°C without losing their ability to maintain good performance over time. Existing techniques involve applying layers onto these components through sputtering or evaporation, which can result in cracks caused by residual stresses from mismatches in coefficients of linear elastic behavior. To address this issue, there have been developed different types of chemical precursors called TEA metals, including molybdenum disilane complex compounds containing chromium atoms.

Method used

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  • Anti-oxidation and heat-insulating ceramic coating and preparation method thereof
  • Anti-oxidation and heat-insulating ceramic coating and preparation method thereof
  • Anti-oxidation and heat-insulating ceramic coating and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] After loading the cleaned K418 superalloy workpiece into the coating chamber, start the vacuum system to evacuate the coating chamber. When the vacuum of the back and bottom reaches 3.5×10 -3 When the Pa is below, argon gas is introduced into the coating chamber, and the workpiece is heated by the bombardment heat effect of the electron beam and the auxiliary heating device. The vacuum pressure is 0.2Pa, and the workpiece is rotated in the coating chamber at a rotation rate of 1rpm until the workpiece is heated to 400°C. ; Then feed hydrogen gas into the coating chamber, adjust the flow rate of argon gas, control the vacuum pressure to 0.2Pa, apply a bias voltage of -600V to the workpiece, and use Ar + and H + The workpiece is etched to remove surface adsorption and contamination, and the duration is 70 minutes. Adjust the argon flow to make the indoor pressure 9Pa, open the Ni 0.47 Cr 0.35 al 0.15 Si 0.02 Y 0.01 For the arc target power supply, set the arc curren...

Embodiment 2

[0035] After loading the cleaned K418 superalloy workpiece into the coating chamber, start the vacuum system to evacuate the coating chamber. When the vacuum of the back and bottom reaches 3.5×10 -3 When Pa is below, argon gas is introduced into the coating chamber, and the workpiece is heated by the bombardment heat effect of the electron beam and the auxiliary heating device. The vacuum pressure is 0.5Pa, and the workpiece is rotated in the coating chamber at a rotation rate of 2rpm until the workpiece is heated to 400°C. ; Then feed hydrogen gas into the coating chamber, adjust the flow rate of argon gas, control the vacuum pressure to 0.35Pa, apply a bias voltage of -600V to the workpiece, and use Ar + and H + The workpiece is etched to remove surface adsorption and contamination, and the duration is 60 minutes. Adjust the argon flow to make the indoor pressure 5Pa, open the Ni 0.40 co 0.20 Cr 0.28 al 0.10 Si 0.01 Y 0.01 For the arc target power supply, set the arc ...

Embodiment 3

[0037] After loading the cleaned 304 stainless steel workpiece into the coating chamber, start the vacuum system to evacuate the coating chamber. -3 When Pa is below, argon gas is introduced into the coating chamber, and the workpiece is heated by the bombardment heat effect of the electron beam and the auxiliary heating device. The vacuum pressure is 0.5Pa, and the workpiece is rotated in the coating chamber at a rotation rate of 2rpm until the workpiece is heated to 350°C. ; Then feed hydrogen gas into the coating chamber, adjust the flow rate of argon gas, control the vacuum pressure to 0.5Pa, apply a bias voltage of -600V to the workpiece, and use Ar + and H + Etching the workpiece to remove surface adsorption and contamination lasts for 90 minutes. Adjust the flow rate of argon gas so that the pressure in the chamber is 5Pa, open the Fe 0.40 Ni 0.15 Cr 0.3 al 0.15 Si 0.04 Y 0.01 For the arc target power supply, set the arc current to 100A, adjust the workpiece bias...

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Abstract

The invention discloses an anti-oxidation and heat-insulating ceramic coating and a preparation method thereof, and belongs to the technical field of surface engineering. The anti-oxidation and heat-insulating ceramic coating is composed of three parts of an Al-Cr-O surface layer, a Cr/Cr2O3 transition layer and an alloy bonding layer, and the anti-oxidation and heat-insulating ceramic coating isrealized by sequentially depositing the alloy bonding layer, the Cr/Cr2O3 transition layer and the Al-Cr-O surface layer through an arc ion plating process. The anti-oxidation and heat-insulating ceramic coating is firmly combined with a high-temperature alloy and a steel workpiece, is compact in structure and small in thickness and has excellent anti-oxidation performance and heat-insulating performance, a preparation process is simple and high in efficiency, implementation is easy, and great application prospects in the aspect of high-temperature protection are achieved.

Description

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Claims

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Application Information

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Owner SICHUAN UNIV
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