Aluminum Phosphate Microspheres Thermal Stability
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Solution Overview
Problem
Prior art microspheres lack morphological and thermal stability at elevated temperatures, colored materials for pigments and paints, nanocomposite architectures, and high emissivity for thermal insulation applications, and existing synthesis methods are costly and inefficient.
Innovation Solution
Development of aluminum phosphate microspheres with high emissivity and thermal stability, capable of being synthesized in solid or hollow forms, incorporating nanocrystalline components like zirconia and titania, and elemental carbon, which can be used in thermal insulation and fire protection systems, and can be produced using spray-drying techniques to achieve desired morphologies and properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If prior art synthesis methods are used to produce microspheres, then microspheres can be obtained, but they lack morphological and thermal stability at elevated temperatures
Solution Approach 1:
The patent changes the chemical composition parameters by incorporating aluminum phosphate as the primary material and adding specific amounts of zirconia (5-20 wt%) and titania (5-20 wt%). It also controls the Al:P molar ratio (1:1 to 20:1) and processes at specific temperatures (500-1500°C) to achieve both morphological and thermal stability at elevated temperatures.
Solution Approach 2:
The patent creates a composite material system combining aluminum phosphate with zirconia and titania nanocrystals. This composite structure provides synergistic effects where zirconia and titania enhance the thermal and morphological stability of aluminum phosphate microspheres at high temperatures.
2Reliability
If prior art microspheres are used, then basic insulation properties are achieved, but they lack high emissivity for thermal insulation applications
Solution Approach 1:
The patent enhances emissivity by incorporating elemental carbon (0.1-10 wt%) into the aluminum phosphate microsphere structure. This compositional parameter change increases the emissivity in the infrared region, improving thermal radiation properties for thermal insulation applications.
Solution Approach 2:
The patent creates a composite structure combining aluminum phosphate with carbon-containing phases. This composite provides both the structural integrity of aluminum phosphate and the high emissivity properties of carbon, achieving superior thermal insulation performance.
3Productivity
If conventional synthesis methods are used, then microspheres can be produced, but the processes are costly and inefficient
Solution Approach 1:
The patent employs a self-service approach where aluminum salts and phosphate sources react in aqueous solution to spontaneously form aluminum phosphate microspheres through controlled precipitation and drying. The process uses readily available materials and standard laboratory equipment, eliminating the need for expensive specialized synthesis equipment.
Solution Approach 2:
The patent optimizes process parameters including pH control (using ammonia or sodium hydroxide), temperature (500-1500°C for heat treatment), and drying conditions to achieve high-yield production of stable microspheres using simple, cost-effective equipment.
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 resulting microspheres provide enhanced thermal insulation, fire resistance, and chemical resistance, with improved stability and emissivity, reducing material costs and enabling applications in diverse industries such as construction, aerospace, and automotive.
Implementation Method 1
spray-drying techniques to achieve desired morphologies and properties
Implementation Method 2
enhanced thermal insulation, fire resistance
Implementation Method 3
Hollow particles can have wall thickness from hundreds of microns to under 0.025 micron. The true density of a hollow microsphere is lower than that of solid materials of the same composition.
Data Source
AI summary
Aluminum phosphate-based microspheres and related compositions and methods of use.