Piston Coating with Scale-like Particles for High-Temperature Insulation
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Solution Overview
Problem
The existing heat insulating coating films on pistons, particularly those with inorganic coating layers, suffer from insufficient heat resistance at high temperatures exceeding 700°C, leading to cracking and peeling, which compromises the heat insulating properties and reduces the thermal efficiency of internal combustion engines.
Innovation Solution
A piston with a protective layer composed of an inorganic compound containing an alkoxide and scale-like inorganic solid particles, such as mica, talc, or wollastonite, dispersed in the compound, which enhances the layer's adhesion and prevents cracking, combined with a primer layer and multiple heat insulating layers to improve adhesion strength and thermal insulation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a heat insulating coating film with inorganic coating layer is formed on the piston, then heat insulating properties are improved, but the coating layer cracks and peels off in high-temperature environments exceeding 700°C
Solution Approach 1:
The patent uses a composite coating structure consisting of a heat insulating layer containing hollow particles and an inorganic coating layer containing scale-like inorganic solid particles (mica, talc, or wollastonite) dispersed in an inorganic compound including alkoxide. This composite structure provides both heat insulating properties and crack resistance, resolving the contradiction between heat insulation and coating integrity at high temperatures.
Solution Approach 2:
The patent changes the physical form of inorganic particles from spherical hollow particles to scale-like inorganic solid particles. This parameter change in particle morphology enables the inorganic coating layer to resist cracking at high temperatures while maintaining adhesion, thus preserving both heat insulating properties and structural integrity.
2Ease of manufacture
If spherical hollow particles are used in the inorganic coating layer, then the coating can be formed, but cracks occur and peeling happens in high-temperature environments
Solution Approach 1:
The patent changes the particle morphology parameter from spherical to scale-like shape. This parameter change fundamentally improves the coating's behavior at high temperatures, preventing crack formation and peeling while maintaining manufacturability through conventional coating processes.
Solution Approach 2:
The patent creates a composite inorganic coating layer by dispersing scale-like inorganic solid particles (mica, talc, or wollastonite) in an inorganic compound including alkoxide. This composite material approach maintains ease of manufacture while dramatically improving high-temperature durability and crack resistance.
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 solution effectively maintains high heat insulating properties even in high-temperature environments, reducing heat escape and improving fuel economy by preventing peeling and enhancing the thermal efficiency of internal combustion engines.
Implementation Method 1
a protective layer formed on the heat insulating layer and including an inorganic compound that includes an alkoxide and scale-like inorganic solid particles dispersed in the inorganic compound
Implementation Method 2
high heat insulating properties can be ensured even in a high-temperature environment
Data Source
AI summary
This vehicle mechanical component includes a mechanical component body, a heat insulating layer formed on the mechanical component body, and a protective layer formed on the heat insulating layer and including an inorganic compound that includes an alkoxide and scale-like inorganic solid particles dispersed in the inorganic compound.