Granular Composite Formulation for Low-Porosity, Flowable Mixtures
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Solution Overview
Problem
The complexity of designing granular composites based on constituent geometry and characteristics makes it challenging to predict and control their structures effectively, particularly in reducing porosity while maintaining low viscosity for fabrication processes.
Innovation Solution
A method of formulating granular composite compositions by mixing particles from separate groups with specific average particle sizes and passing curves, resulting in a combined composite with controlled porosity and viscosity, achieved through optimized mixing conditions and particle distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If particles are mixed to reduce porosity, then density and strength are improved, but viscosity increases making fabrication difficult
Solution Approach 1:
The patent applies parameter changes by systematically varying particle size distribution parameters (using multiple size classes with specific ratios), shape parameters (sphericity, aspect ratio), and surface characteristics (roughness, coating) to optimize the balance between packing density and suspension viscosity. By adjusting these parameters, the formulation achieves high density while maintaining processable viscosity levels.
Solution Approach 2:
The patent employs composite materials principles by creating multi-component particle systems where different particle types (e.g., spherical, irregular, fibrous) are combined in specific ratios. This composite approach allows smaller particles to fill voids between larger particles (increasing density) while the diverse shape and size distribution prevents excessive particle-particle interactions that would increase viscosity.
2Quantity of substance
If particle size distribution is optimized for density, then porosity is reduced, but the complexity of formulation increases
Solution Approach 1:
The patent applies segmentation by dividing the particle size distribution into multiple discrete size classes or modes (e.g., fine, medium, coarse particles) with specific size ranges and proportioning guidelines. This segmented approach simplifies formulation compared to continuous distributions, as each size class can be independently controlled and combined using standardized ratios to achieve target porosity levels.
3Strength
If constituents are mixed to achieve specific structure, then physical characteristics are improved, but reproducibility becomes challenging
Solution Approach 1:
The patent establishes specific parameter ranges and target values for particle properties (size, shape, surface characteristics) and formulation composition (particle ratios, total content). By controlling these parameters within defined ranges rather than using fixed values, the formulation achieves consistent physical characteristics across batches while allowing for normal manufacturing variations, thereby improving reproducibility.
Data Source
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AI summary
The present invention relates to granular composite density enhancement, and related methods and compositions. The applications where these properties are valuable include but are not limited to: 1) additive manufacturing ("3D printing") involving metallic, ceramic, cermet, polymer, plastic, or other dry or solvent-suspended powders or gels, 2) concrete materials, 3) solid propellant materials, 4) cermet materials, 5) granular armors, 6) glass-metal and glass-plastic mixtures, and 7) ceramics comprising (or manufactured using) granular composites.