Graphite Material Production Reducing Anisotropy
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Solution Overview
Problem
Existing graphite production methods, such as cold isostatic press molding, face challenges in achieving uniformity and reducing anisotropy in graphite materials, leading to difficulties in obtaining materials with low directional dependency.
Innovation Solution
A method involving kneading a carbonaceous raw material with a hydrophobic binding material, followed by pulverization, granulation with a hydrophilic binding material and solvent, and subsequent cold isostatic press molding, burning, and graphitization to produce a graphite material with reduced anisotropy and high isotropy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If cold isostatic press molding is used to produce graphite material, then the anisotropy of the material is decreased compared to uniaxial molding, but the material uniformity throughout the material becomes difficult to maintain as the graphite material increases in size
Solution Approach 1:
The patent divides the carbonaceous raw material processing into multiple stages: initial mixing with binder, granulation to form uniform granules, and then molding. This segmentation allows each stage to optimize for its specific function, ensuring uniform material distribution throughout the final product while maintaining low anisotropy
Solution Approach 2:
The patent performs preliminary granulation of the carbonaceous raw material before molding. By pre-forming uniform granules with controlled size and shape, the material is prepared in advance to ensure uniform distribution and reduce anisotropy during the subsequent molding process, especially for large-sized graphite materials
2Volume of moving object
If graphite material size is increased, then the material can meet larger application requirements, but it becomes difficult to obtain uniform material free from or reduced anisotropy throughout the material
Solution Approach 1:
The patent segments the raw material into uniform granules before molding, ensuring that even when the final graphite material is large in size, the internal structure remains uniform throughout. This granulation step creates consistent building blocks that maintain material uniformity regardless of the final product dimensions
Solution Approach 2:
The patent controls the granule size, shape, and distribution parameters during the granulation process to ensure uniform material properties throughout the final large-sized graphite product. By optimizing these parameters, the patent achieves both large size and material uniformity
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 effectively reduces anisotropy in graphite materials, resulting in a product with a thermal expansion coefficient anisotropic ratio of about 5% or less, enhancing material uniformity and isotropy.
Implementation Method 1
adding a hydrophobic binding material to a first carbonaceous raw material containing coke powder, followed by heat kneading to obtain a mixture
Implementation Method 2
adding a hydrophilic binding material and a solvent to the second carbonaceous raw material obtained in the pulverizing step to perform granulation
Implementation Method 3
a burning step of burning the molded body obtained in the molding step to obtain a burnt product
Implementation Method 4
a graphitizing step of graphitizing the burnt product obtained in the burning step
Data Source
AI summary
There is provided a method for producing a graphite material and a graphite material produced by the method The method includes a kneading step of adding a hydrophobic binding material to a first carbonaceous raw material containing coke powder, followed by heat kneading to obtain a mixture, a pulverizing step of pulverizing the mixture obtained in the kneading step to obtain a second carbonaceous raw material, a granulating step of obtaining a granulated powder using the second carbonaceous raw material obtained in the pulverizing step, a hydrophilic binding material and a solvent, a molding step of subjecting the granulated powder obtained in the granulating step to cold isostatic press molding to obtain a molded body, a burning step of burning the molded body obtained in the molding step to obtain a burnt product, and a graphitizing step of graphitizing the burnt product obtained in the burning step.