Porous Ceramic Particles for Thermal Insulation
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Solution Overview
Problem
Existing methods for reducing thermal conductivity in composite materials using porous ceramic particles are insufficient, particularly when fine particles are coated on base particles, leading to difficulties in pore formation and uniform dispersion, which limits the reduction in thermal conductivity and complicates the installation of bulk bodies with complex shapes.
Innovation Solution
Porous ceramic particles with a porosity of 20% to 99%, a mirror surface, aspect ratio greater than or equal to 3, rough side surfaces, and an average pore diameter less than 500 nm, which can be directly installed on objects using an adhesive, facilitating the formation of bulk bodies with low thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If fine particles are coated on base particles to reduce thermal conductivity, then the particle surface is modified, but the distance between base particles becomes short and pore formation becomes difficult
Solution Approach 1:
The particle structure is segmented into a core-shell configuration where base particles serve as the core and porous ceramic particles form the shell. This segmentation allows the porous shell to provide thermal insulation while maintaining adequate inter-particle distances, resolving the contradiction between surface modification for thermal conductivity reduction and pore formation capability.
Solution Approach 2:
A composite particle structure is created combining base particles with porous ceramic particles. The composite consists of an inner core (base particle) and an outer porous shell, allowing simultaneous achievement of thermal conductivity reduction through the porous structure and adequate pore formation by maintaining proper shell thickness and porosity.
2Object-affected harmful factors
If small particles are added to adhesive, then thermal conductivity is reduced, but uniform dispersion of particles becomes difficult
Solution Approach 1:
The particle size parameters are optimized to a specific range (5-50 μm minimum length, aspect ratio ≥3) that balances thermal conductivity reduction with uniform dispersion capability. This parameter optimization ensures particles are small enough to provide thermal insulation but large and shaped appropriately to disperse uniformly in the adhesive.
Solution Approach 2:
The porous ceramic particles exhibit local quality differences with mirror-finished principal surfaces and rough side surfaces. This differential surface quality enhances dispersion stability by reducing aggregation while maintaining thermal insulation effectiveness.
3Strength
If bulk body is formed by firing adhesive with particles, then material bonding is achieved, but placement on complex shapes and partial areas becomes difficult
Solution Approach 1:
The thermal insulation system is segmented into discrete porous ceramic particles that can be applied individually or in groups to complex surfaces. This segmentation allows flexible placement on partial areas and complex shapes while maintaining bonding strength through the adhesive material between particles.
Solution Approach 2:
The solution transitions from forming a monolithic bulk body to creating a particulate assembly in three-dimensional space. This dimensional approach allows the particles to conform to complex surface geometries and be placed in partial areas, achieving both bonding strength and placement flexibility.
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 described porous ceramic particles achieve low thermal conductivity while enabling easier installation of bulk bodies, particularly on complex shapes, by ensuring uniform dispersion and reducing the thermal conductivity of the adhesive regions, thus simplifying the process and enhancing design flexibility.
Implementation Method 1
porous ceramic particles suitable for achieving a reduction in the thermal conductivity of a component material containing the porous ceramic particles
Implementation Method 2
having a porosity of 20% to 99%, and wherein one principal surface of the porous ceramic particle is a mirror surface
Data Source
AI summary
A porous ceramic particle has a porosity of 20% to 99%, and one principal surface of the porous ceramic particle is a mirror surface, and an aspect ratio thereof is greater than or equal to 3.