Heat Treatment Jig Composition for Thermal Shock Resistance
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Solution Overview
Problem
Heat treatment containers used in lithium ion battery manufacturing are prone to breaking under high temperature conditions, necessitating a composition and method for manufacturing a heat treatment jig with enhanced durability against temperature changes.
Innovation Solution
A composition for a heat treatment jig comprising alumina, mullite, cordierite, and fused silica, with specific weight ratios and particle sizes, is used to create a heat treatment jig that exhibits high thermal shock resistance and reaction resistance, achieved through molding and firing processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a heat treatment container is used for high-temperature heat treatment, then the manufacturing efficiency is improved, but the container is highly liable to be broken due to thermal shock
Solution Approach 1:
The patent uses a composite material consisting of alumina (5-25 wt%), mullite (0-35 wt%), cordierite (15-35 wt%), spinel (0-35 wt%), and fused silica (15-50 wt%). This composite composition combines materials with different thermal properties to achieve both high-temperature resistance and thermal shock resistance, resolving the contradiction between productivity improvement through high-temperature processing and reliability maintenance under thermal shock conditions
Solution Approach 2:
The patent optimizes the weight ratios of each component within specific ranges to balance thermal conductivity, thermal expansion coefficient, and mechanical strength. By adjusting these parameters, the material can withstand both high-temperature environments and rapid temperature changes, enabling improved manufacturing efficiency without sacrificing container durability
2Productivity
If the heat treatment container is subjected to forced air cooling at high temperature, then the manufacturing efficiency is improved, but the container breaks due to thermal stress
Solution Approach 1:
The patent incorporates cordierite and fused silica, which have low thermal expansion coefficients, into the composite material. This reduces the overall thermal expansion of the container during rapid cooling, minimizing thermal stress and preventing breakage while allowing forced air cooling processes that improve manufacturing efficiency
Solution Approach 2:
The multi-component composite structure distributes thermal stress across different materials with complementary properties. Alumina provides high-temperature strength, while cordierite and fused silica reduce thermal expansion, creating a material that can withstand forced air cooling without breaking, thus maintaining both productivity and strength
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 heat treatment jig demonstrates improved durability against thermal shock and corrosion, reducing the likelihood of breakage during high-temperature applications, such as in lithium ion battery active material manufacturing.
Implementation Method 1
molding the composition for a heat treatment jig; and firing the resultant molded product
Data Source
AI summary
A composition for a heat treatment jig includes: alumina at a weight ratio within the range of 5% or more and 25% or less; mullite at a weight ratio within the range of 0% or more and 35% or less; cordierite at a weight ratio within the range of 15% or more and 35% or less; spinel at a weight ratio within the range of 0% or more and 35% or less; and fused silica at a weight ratio within the range of 15% or more and 50% or less. The composition for a heat treatment jig is used for the method of manufacturing a heat treatment jig, such as a heat treatment container.