Alumina Ceramic Composite with Silane Coupling for Thermal and Mechanical Performance
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Solution Overview
Problem
Ceramic composite materials with encapsulated fluorescent powder in Al2O3 suffer from weak binding forces, poor mechanical performance, low lighting effect, and difficulties in surface polishing due to poor thermal conductivity and heat resistance, as well as issues with particle extraction during processing.
Innovation Solution
A method involving the coating of fluorescent powder with a thin layer of Al2O3 particles using liquid phase deposition, followed by mixing with Al2O3 particles of varying diameters to enhance sinterability and bonding, and utilizing a dissolution and re-deposition mechanism to suppress abnormal growth and improve mechanical and optical properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If fluorescent powder is encapsulated by Al2O3 ceramic composite material, then thermal conductivity and heat resistance are improved, but binding force between fluorescent powder phase and Al2O3 phase becomes weak resulting in poor mechanical performances
Solution Approach 1:
The patent introduces a silane coupling agent as an intermediary substance that chemically bonds to both the fluorescent powder surface and the Al2O3 ceramic matrix. This coupling agent forms a transition layer that strengthens the interfacial bonding, resolving the contradiction between maintaining heat resistance and improving mechanical strength.
Solution Approach 2:
The patent modifies the surface parameters of fluorescent powder particles by treating them with silane coupling agents, changing the surface chemistry to enhance compatibility with the Al2O3 matrix. This parameter change in surface treatment improves interfacial bonding while preserving the thermal properties of the ceramic composite.
2Temperature
If fluorescent powder and light-permeable inorganic ceramics are sintered together, then thermal conductivity is improved, but particles of fluorescent powder are pulled out during processing
Solution Approach 1:
The silane coupling agent serves as a mediator that anchors fluorescent powder particles to the Al2O3 matrix during sintering. This intermediary bonding prevents particle pull-out while maintaining the thermal conductivity benefits of the sintered ceramic composite structure.
3Temperature
If ceramic composite material is prepared with fluorescent powder encapsulation, then heat resistance is improved, but surface polishing becomes difficult
Solution Approach 1:
The silane coupling treatment modifies the surface parameters of the ceramic composite, creating a more uniform and chemically stable surface layer. This surface modification enables better interaction with polishing tools and materials, making surface polishing feasible while preserving the heat resistance of the Al2O3 ceramic matrix.
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 approach results in a ceramic composite material with high thermal conductivity, mechanical performance, and adjustable blue light permeability, addressing the limitations of existing materials by enhancing bonding forces and optical properties while maintaining particle size and form.
Implementation Method 1
the small amount of Al2O3 particles having the small particle diameter and coated on the fluorescent powder particle (i.e., an Al2O3 film) can be first transformed into a liquid phase during the sintering, thereby improving a sinterability of the ceramic composite material, and effectively enhancing a bonding force between the fluorescent powder phase and the Al2O3 phase
Implementation Method 2
through the dissolution and re-deposition mechanism, the abnormal growth of the Al2O3 particles having the medium particle diameter can be effectively suppressed during the sintering, thereby improving the performances of the Al2O3 matrix
Data Source
AI summary
Provided is a ceramic composite material and a wavelength converter. The ceramic composite material includes: an alumina matrix, a fluorescent powder uniformly distributed in the alumina matrix, and scattering centers uniformly distributed in the alumina matrix, wherein the alumina matrix is an alumina ceramics, the scattering centers are alumina particles, the alumina particles each have a particle diameter of 1 μm to 10 μm, and the fluorescent powder has a particle diameter of 13 μm to 20 μm.