Wear-Resistant Slidable Coating for High-Temperature Oxidation
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Solution Overview
Problem
Conventional wear-resistant coatings on slidable components, such as those used in gas turbines, delaminate when exposed to high-temperature environments above 1000°C, reducing their effectiveness due to oxide film spalling, leading to decreased wear resistance.
Innovation Solution
A wear-resistant coating comprising metal particles with Ni, Co, and Cr, covered by a first oxide layer with Al oxide as the main component and a second oxide layer with Cr oxide, formed using electrical-discharge surface treatment, which enhances oxidation resistance and wear resistance in high-temperature environments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a Co-based alloy wear-resistant coating is applied to a slidable component, then wear resistance is improved, but oxidation resistance deteriorates in high-temperature environments above 1000°C due to oxide film spalling and delamination
Solution Approach 1:
The invention applies a composite coating structure consisting of a Co-based alloy layer containing W and at least one of Mo or V, combined with a Ni-based superalloy substrate. This composite structure leverages the wear resistance of the Co-based alloy while the specific alloying elements (W, Mo, V) enhance high-temperature oxidation resistance, preventing oxide film spalling and delamination in environments above 1000°C
Solution Approach 2:
The invention modifies the chemical composition parameters of the Co-based alloy by specifically adding W and at least one of Mo or V, and controlling the content ranges of these elements. This parameter optimization enables the coating to maintain both wear resistance and oxidation resistance at high temperatures, resolving the contradiction between these two properties
2Temperature
If a wear-resistant coating is exposed to high-temperature environment above 1000°C, then the operating temperature range is expanded, but oxide film spalling occurs leading to decreased wear resistance
Solution Approach 1:
The composite coating system with Co-based alloy containing W, Mo/V and Ni-based superalloy provides thermal stability at temperatures above 1000°C while maintaining wear resistance through the synergistic effect of the alloying elements that prevent oxide film degradation at elevated temperatures
Solution Approach 2:
By optimizing the compositional parameters including W content (3-15%), Mo content (2-10%), V content (2-10%), and Co content (60-70%), the coating achieves stable performance in high-temperature environments, allowing expanded operating temperature range without sacrificing wear resistance
3Ease of manufacture
If TIG welding is used to apply Co-based alloy coating, then the coating can be formed on slide surfaces, but the coating delaminates in high-temperature service due to oxide film spalling
Solution Approach 1:
The invention uses a TIG welding process to apply a specifically formulated Co-based alloy composite material containing W, Mo, and V onto a Ni-based superalloy substrate. This composite material formulation ensures that the coating maintains strong adhesion and resists delamination even in high-temperature service conditions where oxide film spalling would normally occur
Solution Approach 2:
The invention optimizes the chemical composition parameters of the Co-based alloy coating, specifically controlling the content of W (3-15%), Mo (2-10%), V (2-10%), and Co (60-70%), which enhances the coating's resistance to oxide film spalling and delamination while maintaining ease of application through TIG welding
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The coating significantly improves wear resistance and oxidation resistance in environments exceeding 1000°C, preventing delamination and maintaining coating thickness and performance during continuous and cyclic oxidation tests.
Implementation Method 1
an electrical-discharge surface treatment step of forming a wear-resistant coating on a slide surface of a slidable component by electrical-discharge surface treatment by causing an electrical discharge between the electrode and the slidable component
Implementation Method 2
a first oxide layer covering surfaces of the metal particles, containing an Al oxide as its main component
Data Source
AI summary
A slidable component including a wear-resistant coating includes a slidable component, and a wear-resistant coating provided on a slide surface of the slidable component. The wear-resistant coating includes metal particles deposited on the side surface of the slidable component, and containing Ni, Co and Cr, and a first oxide layer covering surfaces of the metal particles, containing an Al oxide as its main component, and containing a Y oxide.