Spinel Particles Thermal Conductivity via Crystallite Growth
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Solution Overview
Problem
Conventional spinel particles are not used as inorganic fillers with thermal conductive properties due to their lower thermal conductivity compared to alumina, which is generally used, making them unsuitable for applications requiring thermal conductivity.
Innovation Solution
Increasing the crystallite diameter of spinel particles at the [311] plane to 100 nm or more, incorporating molybdenum on the surface or inside, and optimizing the production method to enhance thermal conductivity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If conventional spinel particles are used as inorganic fillers, then cost is reduced compared to alumina, but thermal conductivity is insufficient for radiator applications
Solution Approach 1:
The invention changes the crystallite diameter parameter of spinel particles from conventional small sizes to 100 nm or more at the [311] plane. This parameter change fundamentally alters the thermal conductivity properties of spinel, enabling it to achieve thermal conductivity of 10 W/(m·K) or more, which resolves the contradiction between cost and thermal conductivity by maintaining the cost advantage of spinel while achieving the thermal performance previously only available from alumina
Solution Approach 2:
The invention creates a composite structure by incorporating molybdenum on the surface and/or inside the spinel particles. This composite approach combines spinel's cost advantage with molybdenum's thermal conductive properties, resulting in a material that achieves superior thermal conductivity while maintaining lower cost compared to pure alumina fillers
2Reliability
If spinel crystallite diameter is increased to improve thermal conductivity, then thermal conductive properties are enhanced, but particle size control becomes more difficult
Solution Approach 1:
The invention uses molybdenum as a preliminary action during the synthesis process. By incorporating molybdenum on the surface and/or inside the spinel particles during formation, the crystallite growth is controlled and directed to achieve the desired 100 nm or more crystallite diameter at the [311] plane. This preliminary incorporation of molybdenum facilitates precise control of crystallite size while achieving the target thermal conductivity
Solution Approach 2:
Molybdenum acts as an intermediary element that mediates between the synthesis conditions and the final crystallite structure. The presence of molybdenum during synthesis influences the crystal growth kinetics, enabling precise control of the crystallite diameter to 100 nm or more at the [311] plane, thus resolving the manufacturing precision challenge
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 spinel particles exhibit excellent thermal conductive properties, surpassing the conductivity of alumina, making them suitable for use in thermally conductive materials and applications.
Implementation Method 1
spinel particles having excellent thermal conductive properties
Implementation Method 2
the crystallite diameter of the spinel at the [311] plane is 100 nm or more
Data Source
AI summary
Spinel has conventionally been used as mentioned above in applications, such as gems, catalyst carriers, adsorbents, photocatalysts, optical materials, and heat-resistant insulating materials, and is not expected to be used in an application of an inorganic filler having thermal conductive properties. Accordingly, an object of the present invention is to provide spinel particles having excellent thermal conductive properties. A spinel particle having spinel containing a magnesium atom, an aluminum atom, and an oxygen atom, and molybdenum being existed on the surface of and/or in the inside of the spinel, wherein the crystallite diameter of the spinel at the [311] plane is 100 nm or more.