Casting Mold Surface Layer Adhesion Optimization
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Solution Overview
Problem
Existing casting structures face issues with adhesion between the main body and the surface layer, leading to peeling during high-temperature molten metal casting, which causes inclusion defects and gas defects.
Innovation Solution
A casting structure with a main body composed of organic fibers, inorganic fibers, inorganic particles, and a binder, along with a surface layer containing specific ratios of aluminum and zirconium inorganic components, enhances adhesion by satisfying the relationship 0.375x - 7.5 < y < 0.375x + 71, where x and y represent the mass percentages of aluminum and zirconium in the main body and surface layer, respectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a surface layer is formed on the main body to block pyrolysis gas, then gas defects are reduced, but adhesion between the surface layer and main body deteriorates, causing peeling during high-temperature casting
Solution Approach 1:
The invention changes the chemical composition parameters of the surface layer by specifying precise ratios of aluminum oxide (5-50 wt%) and zirconium oxide (5-50 wt%). These parameter adjustments optimize both the gas-blocking performance and adhesion strength of the surface layer, resolving the contradiction between reducing gas defects and maintaining strong adhesion during high-temperature casting.
Solution Approach 2:
The invention creates a composite surface layer material combining multiple inorganic components (aluminum oxide, zirconium oxide, and other refractory materials) with organic binder. This composite structure provides both the gas-blocking capability through the inorganic matrix and the adhesion strength through the binder system, simultaneously addressing both requirements.
2Temperature
If the surface layer contains high inorganic component content to improve heat resistance, then adhesion under high-temperature conditions improves, but manufacturing complexity increases due to precise composition control
Solution Approach 1:
The invention establishes specific parameter ranges for inorganic component content (aluminum oxide 5-50 wt%, zirconium oxide 5-50 wt%) that ensure adequate heat resistance. By defining these clear parameter boundaries, the invention simplifies the composition control process while maintaining the required thermal performance and adhesion properties during high-temperature casting.
Data Source
Figure 1
Figure 2(a)~2(d)
Figure 3(a)~3(b)
AI summary
A structure (3) for producing a casting includes a main body (31) and a surface layer (32) covering the inner surface of the main body (31). The main body (31) contains an inorganic component at 45% by mass or more and 80% by mass or less, and the inorganic component contains at least one element selected from aluminum and zirconium. The surface layer (32) contains an inorganic component at 80% by mass or more, and the inorganic component contains at least one element selected from aluminum and zirconium. The inorganic component contained in the main body (31) and the inorganic component contained in the surface layer (32) satisfy a certain relationship.