Water-Glass Mold Materials for Low-Emission Core Disintegration
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Solution Overview
Problem
Existing inorganic binders for molds and cores, particularly those using water glass, suffer from poor disintegration properties at high casting temperatures, leading to residual strength and difficulty in recycling, while organic promoters introduce undesirable emissions and contaminants.
Innovation Solution
A molding material mixture comprising particulate amorphous silicon dioxide and layered silicates, which facilitates disintegration and regenerability, is used with a chemical reaction-based curing process, minimizing residual strength and emissions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-generated harmful factors
If inorganic binders (water glass) are used for molds and cores, then emissions during casting are minimized, but disintegration properties at high temperatures deteriorate
Solution Approach 1:
The patent uses composite materials by combining water glass binder with specific additives including particulate amorphous silicon dioxide (0.1-3 wt%), layered silicates (0.05-0.4 wt%), and metal oxides (aluminum oxide, zirconium oxide). This composite formulation maintains the low-emission advantage of inorganic binders while improving disintegration properties through the synergistic effect of components that reduce residual strength at high temperatures.
Solution Approach 2:
The patent modifies the chemical composition parameters of the binder system by precisely controlling the ratios of water glass, amorphous silicon dioxide, layered silicates, and metal oxides. These parameter changes optimize the thermal behavior of the binder to achieve better disintegration at casting temperatures while maintaining adequate strength during molding and casting operations.
2Ease of manufacture
If molds and cores are designed for easy disintegration, then recycling becomes feasible, but mechanical stability during casting may be compromised
Solution Approach 1:
The patent applies local quality by creating different functional zones within the binder system: the water glass provides binding strength in the green state and during casting, while the additives (amorphous silicon dioxide, layered silicates, metal oxides) are distributed to provide localized disintegration promotion at high temperatures. This spatial and functional differentiation allows the binder to exhibit contrasting properties at different stages of the process.
Solution Approach 2:
The binder system exhibits dynamic behavior, transitioning from a strong, stable state during molding and casting to a weakened, disintegratable state at high temperatures. The chemical composition is designed to undergo thermal transformations that dynamically change the mechanical properties, enabling both stability during use and easy disintegration for recycling.
3Strength
If organic promoters are added to improve disintegration, then disintegration properties improve, but harmful emissions and contaminants increase
Solution Approach 1:
The patent converts the typically harmful organic additives into beneficial inorganic components. By using particulate amorphous silicon dioxide, layered silicates, and metal oxides instead of organic promoters, the system achieves improved disintegration properties while avoiding the harmful emissions and contaminants associated with organic materials. The inorganic additives promote disintegration through thermal decomposition and chemical reactions that do not produce harmful byproducts.
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 method produces molds and cores with excellent disintegration properties, low emissions, and high regenerability, allowing for efficient recycling with minimal environmental impact.
Implementation Method 1
curing the molding material mixture by chemical reaction of components of the molding material mixture with one another
Implementation Method 2
the molded molding material mixture is heated, whereby the disintegration of the mold or core is facilitated
Data Source
AI summary
The invention relates to a method for producing casting molds, cores and basic mold materials regenerated therefrom, a mixture for combining with a solution or dispersion comprising water glass, for producting casting molds and/or cores, a mold material mixture, a basic mold material mixture and a casting mold or a core. The invention furthermore relates to the corresponding use of a quantity of particulate layered silicates having a d90 value less than 45 μm or a corresponding mixture as an additive for producing a water glass and a mold material mixture comprising particulate, amorphous silicon-dioxide, said mixture being cured by chemically reacting components of the mold material mixture with each other, during production of a casting mold or a core, in order to facilitate disintegration and/or to increase the regeneration capability of the casting mold or core.