Thermal Spray Slurry Density and Crack Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Thermal spraying methods often result in coatings with cracks and porosity, despite forming dense coatings, which affects their durability and surface quality.
Innovation Solution
A thermal spray slurry with a specific particle size range (1 μm to 10 μm) and a filling rate of 84 mass % or less, calculated by centrifugation, is used to disperse thermal spray particles in a dispersion medium, allowing for the formation of a dense coating while minimizing cracks and pores.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If thermal spray slurry with high filling rate is used to form dense coating, then coating density is improved, but coating cracks occur
Solution Approach 1:
The patent applies parameter changes by precisely controlling the filling rate parameter within 60-80 mass% and particle diameter within 1-10 μm. This optimization of physical parameters enables the slurry to form dense coatings without cracking, resolving the contradiction between coating density and coating integrity.
Solution Approach 2:
The patent introduces dynamic adjustment of slurry composition and spraying parameters. By controlling particle size distribution and filling rate dynamically, the slurry adapts to thermal spray conditions, achieving both high density and crack-free coatings through optimized material flow and deposition behavior.
2Manufacturing precision
If particle size is reduced to improve coating density, then coating porosity is reduced, but coating cracks increase
Solution Approach 1:
The patent applies local quality by creating a controlled particle size distribution where finer particles (1-10 μm) are strategically distributed within the slurry. This localized optimization of particle characteristics fills pores effectively while maintaining overall coating integrity, preventing both porosity and cracking.
Solution Approach 2:
The patent uses composite material principles by combining thermal spray particles of specific size ranges with dispersion media in optimized ratios. This composite slurry formulation achieves synergistic effects where the particle-matrix combination provides both pore-filling capability 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 approach enables the creation of dense, crack-free coatings with improved surface roughness and reduced porosity, enhancing the coating's durability and quality.
Implementation Method 1
a dispersion medium in which the thermal spray particles are dispersed
Implementation Method 2
the mass of cake of the thermal spray particles obtained by precipitating the thermal spray particles out of the thermal spray slurry by centrifugation
Data Source
AI summary
Provided is thermal spray slurry capable of forming a dense coating by thermal spraying while suppressing cracks. Thermal spray slurry includes: thermal spray particles having an average particle diameter of 1 μm or more and 10 μm or less and a dispersion medium in which the thermal spray particles are dispersed, and has a filling rate of 84 mass % or less, the filling rate being calculated by the following expression,filling rate (mass %)=B/A×100,where A denotes the mass of cake of the thermal spray particles obtained by precipitating the thermal spray particles out of the thermal spray slurry by centrifugation, and B denotes the mass of a dry matter obtained by removing the dispersion medium from the cake.