Hollow Silica Sphere Formation With Vacuum Shell Expansion Control
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing methods for producing hollow spheres face limitations such as low strength under high shear forces, environmental concerns from impurities, and restricted use at elevated temperatures due to viscosity issues, particularly with cenospheres and glass microspheres.
Innovation Solution
A method involving seeds with cores and coatings that react to form hollow spheres by controlling heating and pressure, using additives to alter properties, and employing plasma torches for mass production, allowing for controlled expansion and formation of hollow spheres with varied compositions and applications.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Weight of stationary object
If cenospheres are used as hollow glass microspheres, then density reduction is achieved, but environmental harm increases due to heavy metal impurities and their low viscosity causes collapse at elevated temperatures
Solution Approach 1:
The patent extracts and removes the harmful heavy metal impurities from the hollow sphere composition by using a controlled synthesis process that produces pure silica-based hollow spheres without the contaminant oxides found in cenospheres. This extraction of harmful elements resolves the environmental harm issue while maintaining the density reduction benefit.
Solution Approach 2:
The patent changes the chemical composition parameters by formulating hollow spheres with specific oxide ratios (SiO2, Al2O3, CaO, MgO, K2O, TiO2) and controlling their content ranges to achieve both high-temperature stability and low density. The viscosity is improved by adjusting the glass composition to prevent collapse at elevated temperatures.
2Weight of stationary object
If glass microspheres are used as filler material, then density reduction is achieved, but strength decreases under high shear forces and high pressures
Solution Approach 1:
The patent creates a composite structure by combining multiple oxide materials (silica, alumina, and various basic oxides) in specific proportions to form hollow spheres with enhanced mechanical properties. The composite glass composition provides both the density reduction of hollow spheres and the strength to withstand high shear forces and pressures during processing.
3Adaptability or versatility
If hollow spheres are produced with varied compositions for different applications, then versatility improves, but manufacturing complexity increases
Solution Approach 1:
The patent develops a universal manufacturing process using a plasma torch that can produce hollow spheres with different compositions and properties by simply adjusting the feed material composition. The same basic process and equipment handle various applications (radar absorption, thermal management, composites) without requiring different manufacturing lines, thus achieving versatility without proportional increases in manufacturing complexity.
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 enables the production of hollow spheres with improved strength, reduced environmental impact, and expanded temperature tolerance, suitable for diverse applications including composites, radar absorption, and thermal management.
Implementation Method 1
The seed is heated to a temperature sufficient to transform the coating into a continuous shell having an interior and an exterior
Implementation Method 2
the reaction between the two or more compounds of the core, and the reaction between the two or more compounds converts the core to a gas within the shell
Implementation Method 3
The rate of heating and a pressure surrounding the exterior of the shell are controlled to allow the shell to expand responsive to a pressure of the gas within the shell
Implementation Method 4
gases within the shell react with one another to revert to a solid form, thereby creating a vacuum within the rigid shell
Data Source
AI summary
Methods for producing a hollow spheres, optionally with a vacuum inside, are disclosed. An example method includes providing a seed with a core and a coating. The seed is heated to a temperature sufficient to transform the coating into a continuous shell having an interior and an exterior. The shell isolates the core from the exterior of the shell. The temperature is also sufficient to cause a reaction with the materials of the core, and the reaction converts the core to a gas within said shell. Controlling the rate of heating and the pressure surrounding the shell allows the shell to expand responsive to gas pressure within the shell. Cooling the shell causes the gases within the shell to revert to a solid form, thereby creating a vacuum within the shell. Products incorporating the hollow spheres are also disclosed.