TiB2-BN Composite Coating for Metallization Boat Wear
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Solution Overview
Problem
Coatings for contact surfaces in metallization boats lack durability and corrosion resistance, leading to significant scrap generation and premature failure due to corrosion and non-uniformity, necessitating the development of a wear-resistant and low-friction coating that can effectively recycle scrap materials.
Innovation Solution
A composite powder coating comprising titanium diboride (TiB2) and boron nitride (BN) in a metal matrix, with a TiB2 to BN ratio ranging from 1:7 to 20:1, is applied to contact surfaces, utilizing recycled materials from discarded metallization boats and side dams to create a sintered composite with improved wear resistance and friction modification properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If BN is used to provide lubrication property, then friction resistance is improved, but wear resistance deteriorates
Solution Approach 1:
The patent applies composite materials by combining BN and TiB2 in a coating composition. BN provides lubrication properties to reduce friction, while TiB2 provides hardness and wear resistance. The synergistic combination allows the coating to simultaneously achieve low friction and high wear resistance, resolving the technical contradiction between these two properties.
2Strength
If TiB2 is used to improve fracture toughness, then strength is improved, but lubrication property deteriorates
Solution Approach 1:
The composite coating composition combines TiB2 and BN in specific ratios. TiB2 particles provide fracture toughness and strength, while BN particles provide lubrication properties. The composite structure allows both materials to contribute their respective advantages, resolving the contradiction between strength and lubrication property.
3Strength
If coating composition contains high ceramic content, then wear resistance is improved, but coating durability deteriorates
Solution Approach 1:
The patent uses a composite coating composition with optimized ratios of ceramic particles (TiB2 and BN) in a metal matrix. This composite structure provides wear resistance from the ceramic particles while the metal matrix ensures coating durability and adhesion to the substrate, resolving the contradiction between wear resistance and coating durability.
Solution Approach 2:
The patent optimizes the ratio of TiB2 to BN particles in the coating composition, as well as the overall ceramic content in the metal matrix. By carefully controlling these parameters, the coating achieves both high wear resistance and long-term durability, resolving the technical contradiction.
4Manufacturing precision
If conventional coatings are used on metallization boats, then initial performance is achieved, but service life deteriorates due to corrosion and wear
Solution Approach 1:
The patent applies a composite coating composition containing TiB2 and BN particles in a metal matrix to metallization boats. This coating provides superior resistance to molten metal corrosion, wear, and thermal shock, significantly extending the service life of metallization boats while maintaining their manufacturing precision and performance characteristics.
Solution Approach 2:
The coating composition provides localized protection to contact surfaces of metallization boats that are subject to wear and corrosion. The composite structure with hard TiB2 particles and lubricating BN particles creates a surface layer with enhanced local properties that resist degradation during service, extending overall component life.
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 composition exhibits enhanced wear resistance, thermal conductivity, and friction reduction, effectively recycling scrap materials and extending the lifespan of components by providing improved performance in demanding tribological applications.
Implementation Method 1
a sintered composite with a TiB2 to BN ratio ranging from 1:7 to 20:1
Implementation Method 2
thermal spraying, plasma spraying
Implementation Method 3
thermal spraying, plasma spraying
Implementation Method 4
BN is often used to provide abradability while maintaining erosion resistance
Data Source
AI summary
A composition for coating sliding or rolling or fretting or impacting members is formed by preparing a composite powder of TiB2 and BN, with a TiB2 to BN ratio ranging from 1:7 to 20:1, and a metallic matrix selected from the group consisting of nickel, chromium, iron, cobalt, aluminum, tungsten, carbon and alloys thereof.