Al2O3-Resin Composite Coating via SAPS for Resin Matrix
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Solution Overview
Problem
Resin matrix composites face limitations due to poor heat resistance and ablation resistance, which are exacerbated by the thermal decomposition of traditional coatings, particularly when using Al2O3 ceramic coatings that have a high melting point exceeding the thermal decomposition temperature of the resin matrix composite.
Innovation Solution
A composite coating method involving the preparation of ceramic-resin composite powders with Al2O3 ceramic and phenolic resin, using supersonic atmospheric plasma spraying (SAPS) to create a coating with a continuous gradient structure, where Al2O3 ceramic powders are fed inside the spray gun and ceramic-resin composite powders are fed outside, ensuring the resin is not decomposed and the thermal expansion difference is minimized, thereby enhancing bonding strength and heat resistance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Al2O3 ceramic coating is applied to resin matrix composite surface, then heat resistance and wear resistance are improved, but thermal decomposition of resin matrix occurs due to high temperature exceeding 2000°C
Solution Approach 1:
The patent applies different materials to different regions of the coating system: Al2O3 ceramic provides heat resistance in high-temperature zones while resin matrix provides bonding and flexibility in lower-temperature zones. This local differentiation allows each material to function optimally in its suitable temperature range without causing thermal decomposition.
Solution Approach 2:
The patent creates a composite coating system combining Al2O3 ceramic particles with resin matrix, forming a multi-phase composite structure. This composite approach allows the ceramic to provide heat resistance while the resin provides bonding, achieving both protection and structural integrity without thermal decomposition of the substrate.
2Reliability
If Al2O3 ceramic coating is applied to resin matrix composite surface, then wear resistance is improved, but bonding strength deteriorates due to thermal expansion difference between coating and substrate
Solution Approach 1:
The resin matrix is positioned specifically at the interface between the ceramic coating and substrate, where it serves as a bonding layer that accommodates thermal expansion differences. This local placement of flexible material at the critical interface region maintains bonding strength while allowing the ceramic surface to provide wear resistance.
Solution Approach 2:
The resin matrix acts as an intermediary layer between the rigid Al2O3 ceramic coating and the substrate, absorbing thermal expansion stresses and preventing direct stress transmission that would cause bonding failure. This mediator function preserves both wear resistance and bonding strength.
3Ease of manufacture
If traditional plasma spraying method is used, then coating process is simple, but coating quality deteriorates due to insufficient melting of ceramic particles
Solution Approach 1:
The patent modifies plasma spraying parameters including increasing plasma power, optimizing spray distance, and adjusting powder feed rate to achieve sufficient ceramic particle melting. These parameter changes ensure complete melting and proper spreading of Al2O3 particles while maintaining a relatively simple coating process.
Solution Approach 2:
The patent performs preliminary surface treatment of the substrate before coating application, including cleaning and roughening the surface. This preliminary action improves adhesion and ensures better coating quality without requiring complex in-process modifications.
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 method effectively improves the bonding strength and heat resistance of the coating, reducing thermal conductivity and thermal expansion coefficients, while maintaining the resin's integrity and expanding the application range of resin matrix composites by creating a reliable and durable Al2O3-PF composite coating with a bonding strength of up to 26 MPa.
Implementation Method 1
supersonic atmospheric plasma spraying
Implementation Method 2
make ceramic particles sufficiently melted and meanwhile allows heating time and heating distance to be shortened to facilitate synchronous melting of ceramic and resin
Implementation Method 3
the sufficiently melted particles can impact the matrix at higher kinetic energy so as to be flattened, bonding strengths between particles and between the coating and the matrix are increased
Data Source
AI summary
The disclosure discloses a preparation method of a composite coating for a resin matrix composite, comprising the following steps: preparing ceramic-resin composite powders which comprise Al2O3 ceramic, a thermosetting resin and a curing agent and are semi-thermosetting resin powders; and respectively spraying pure Al2O3 ceramic powders and the composite powders on the surface of the resin matrix composite by supersonic atmospheric plasma spraying to form a ceramic-resin composite coating, wherein the pure Al2O3 ceramic powders are fed into jet flow in a manner of feeding powder inside a spray gun, and the composite powders are fed into jet flow in a manner of feeding powder outside the spray gun. Correspondingly, the disclosure also provides a preparation device of a composite coating for a resin matrix composite.