Closed-Pore Expanded Perlite Microspheres for Foundry Moldings
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Solution Overview
Problem
Existing open-pore, expanded perlites used in feeders for the foundry industry fail to meet the heightened requirements of high pressure resistance and modulus of elasticity, necessitating the development of a more suitable lightweight filler.
Innovation Solution
The use of closed-pore microspheres of expanded perlite as a filler in moldings for the foundry industry, produced through a multistage temperature zone expansion process, offering improved strength, modulus of elasticity, and insulating effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of moving object
If open-pore expanded perlite is used as filler, then lightweight insulation is achieved, but pressure resistance and modulus of elasticity are insufficient
Solution Approach 1:
The patent uses expanded perlite with controlled pore structure (open-pore to closed-pore transition) to achieve both lightweight insulation and improved pressure resistance. The porous structure provides insulation while the specific pore configuration enhances mechanical strength.
Solution Approach 2:
The patent creates a composite filler system by combining expanded perlite with other materials (such as hollow spheres, foam materials, or particle aggregates) to achieve synergistic effects where the combination provides both lightweight properties and enhanced mechanical strength.
2Weight of moving object
If open-pore expanded perlite is used as filler, then lightweight insulation is achieved, but modulus of elasticity is insufficient
Solution Approach 1:
The patent utilizes the porous structure of expanded perlite, potentially transitioning from open-pore to closed-pore configuration, to maintain lightweight properties while improving the modulus of elasticity through enhanced structural integrity.
Solution Approach 2:
The patent develops composite filler compositions combining expanded perlite with materials having higher elastic moduli to achieve the desired mechanical stability while maintaining lightweight characteristics.
3Ease of manufacture
If conventional filler materials are used, then manufacturing simplicity is maintained, but insulating properties are insufficient
Solution Approach 1:
The patent employs expanded perlite with optimized pore structure that provides excellent thermal insulation properties. The porous configuration creates air pockets that resist heat transfer, achieving superior insulating performance.
Solution Approach 2:
The patent optimizes parameters such as particle size distribution, pore size, and expansion degree of the perlite to enhance thermal insulation properties while maintaining ease of manufacturing through conventional expansion processes.
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 closed-pore microspheres provide enhanced stability and reduced binder requirements, leading to stronger moldings with improved insulating properties, capable of withstanding higher pressures and maintaining metallostatic pressure effectively.
Implementation Method 1
The closed-pore microspheres provide enhanced stability and reduced binder requirements, leading to stronger moldings with improved insulating properties
Data Source
AI summary
The present invention relates to the use of closed-pore microspheres of expanded perlite as a filler for producing moldings for the foundry industry, to a composition for producing moldings for the foundry industry, comprising closed-pore microspheres of expanded perlite as a filler, and a binder, the binder being selected from the group consisting of water glass, phenol-formaldehyde resins, two-component systems comprising as reactants a polyisocyanate and a polyol component containing free hydroxyl groups (OH groups), and starch, and also to moldings for the foundry industry and to a process for producing a molding for the foundry industry.