Heat-Treated Refractory Particles for Casting Mold Binder Reduction
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Solution Overview
Problem
The use of artificially produced refractory particles in casting molds requires a higher amount of organic binder to achieve desired strength, leading to increased costs and risks of gas defects, while reducing the binder amount results in insufficient mold strength.
Innovation Solution
Subjecting artificial aggregates with an apparent porosity of not more than 5% to a heat treatment in a reducing atmosphere with a low oxygen concentration between 400-1500°C to enhance their affinity with furan resin, allowing for reduced binder usage and improved mold strength.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If artificially produced refractory particles are used in casting molds, then the consistency and availability of material supply is improved, but a larger amount of organic binder is required to achieve desired strength
Solution Approach 1:
The patent applies parameter changes by controlling the apparent porosity of artificial refractory particles to 40-60% and subjecting them to heat treatment at 400-1500°C in a reducing atmosphere. These parameter adjustments modify the surface properties and internal structure of the particles, enhancing their affinity with furan resin binder and reducing the binder amount required from 8-12% to 3-6% by weight
Solution Approach 2:
The patent creates a composite system by combining artificial refractory particles with specific porosity characteristics with organic binder (furan resin). The composite structure leverages the porous nature of the refractory particles to maximize binder adhesion and effectiveness, achieving optimal strength with reduced binder quantity
2Strength
If a larger amount of organic binder is used to increase casting mold strength, then the strength of the casting mold is improved, but the cost increases and the risk of gas defects increases
Solution Approach 1:
The patent changes the physical and chemical parameters of the refractory particles (apparent porosity of 40-60% and heat treatment at 400-1500°C in reducing atmosphere) to optimize binder interaction. This reduces the binder amount required to 3-6% by weight, thereby minimizing gas generation during curing while achieving the desired mold strength
Solution Approach 2:
The patent converts the typically harmful effect of porous structures (which can trap gas) into a benefit by utilizing the porous internal structure of artificial refractory particles to enhance binder adhesion. The porosity that could potentially cause gas defects instead provides surface area and capillary action that improve binder penetration and bonding, reducing the overall binder quantity needed
3Reliability
If artificially produced refractory particles are used in casting molds, then natural resource exhaustion is addressed, but the affinity with organic binder is reduced requiring more binder
Solution Approach 1:
The patent applies parameter changes by controlling the apparent porosity of artificial refractory particles to 40-60% and subjecting them to heat treatment at 400-1500°C in a reducing atmosphere. These modifications fundamentally change the surface chemistry and physical structure, creating active sites that enhance affinity with furan resin binder despite the artificial origin of the particles
4Object-generated harmful factors
If the amount of binder is reduced to decrease cost and gas defect risk, then cost and gas defect risk are reduced, but the strength of the casting mold becomes insufficient
Solution Approach 1:
The patent changes the parameters of refractory particles (apparent porosity of 40-60% and heat treatment at 400-1500°C) to maximize binder efficiency. This allows using only 3-6% by weight binder while achieving sufficient mold strength, compared to 8-12% binder required with conventional particles
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
This method effectively increases the strength of casting molds while minimizing the required amount of binder, reducing costs and the risk of gas defects, and stabilizing the surface properties of the refractory particles.
Implementation Method 1
an artificial aggregate which is artificially produced and which has an apparent porosity of not more than 5% is used as the refractory particles and the artificial aggregate is subjected to a heat treatment at a temperature of 400-1500° C. for not shorter than one hour in a heating atmosphere having an oxygen concentration of not higher than 15%
Data Source
AI summary
Providing a method of modifying refractory particles used to produce a casting mold by using a furan resin as a binder, so as to effectively improve a strength of the casting mold and to reduce a required amount of the binder. An artificial aggregate which is artificially produced and which has an apparent porosity of not more than 5% is used as the refractory particles, and the artificial aggregate is subjected to a heat treatment at a temperature of 400-1500° C. for not shorter than one hour in a heating atmosphere having an oxygen concentration of not higher than 15%.