Stack Carbon Foam Defect Compensation via Segmentation
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Solution Overview
Problem
The challenge lies in manufacturing thin carbon foams with reduced through holes, as existing methods either destroy the internal structure during compression or result in poor handleability due to penetrating defects in the raw material resin foam.
Innovation Solution
The approach involves laminating two or more thin raw material films to compensate for random penetrating defects, resulting in a stack carbon foam with fewer through holes and improved handleability, achieved by aligning or misaligning the outer edges of through holes at the contact surfaces of adjacent monolayers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If a resin foam is pressed by a press machine to reduce thickness, then the thickness is reduced, but the internal structure is destroyed when compressed to certain degree
Solution Approach 1:
The patent divides the carbon foam into multiple thin monolayer carbon foams stacked together. Each monolayer has a thickness of 0.03mm to 0.5mm, which is thin enough to meet application requirements but thin enough to avoid destroying the internal structure during manufacturing. The stack configuration achieves the desired overall thickness reduction while preserving the integrity of individual layers.
Solution Approach 2:
Instead of reducing thickness by compressing a single thick foam in the thickness direction (one-dimensional compression), the patent transitions to a multi-layer stacking approach where multiple thin foams are assembled in the thickness direction. This dimensional reorganization allows achieving thin overall thickness without subjecting individual layers to excessive compression that would destroy their internal structures.
2Length of stationary object
If a thin-film raw material is used to manufacture thin carbon foam, then the thickness is reduced, but penetrating defects cause the carbon fiber sheet to be easily torn
Solution Approach 1:
The patent segments the thin-film structure into multiple monolayer carbon foams, each with controlled thickness and defect distribution. By using multiple layers instead of a single thin layer, the overall structure achieves the desired thinness while the statistical distribution of penetrating defects across layers reduces the likelihood of continuous defect paths that would cause tearing.
Solution Approach 2:
The patent anticipates the problem of penetrating defects by pre-compensating through multi-layer stacking. The random distribution of defects in each layer means that defects in one layer are likely to be offset by intact regions in adjacent layers, creating a cushioning effect that prevents defect propagation and maintains handleability despite the thin overall thickness.
3Length of stationary object
If the raw material is thinned to reduce thickness, then the thickness is reduced, but completely penetrating defects appear making the material difficult to handle
Solution Approach 1:
The patent divides the thinned material into multiple monolayer carbon foams with controlled individual thicknesses. This segmentation ensures that each layer remains thick enough to avoid severe thinning defects while the stacked configuration achieves the desired overall thinness for the final product.
Solution Approach 2:
The patent creates a composite structure by stacking multiple monolayer carbon foams together. This composite approach combines multiple thin layers with statistically distributed defects, resulting in an overall structure that is thin enough for application requirements but maintains sufficient handleability because defects do not continuously penetrate through all layers.
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
This method effectively reduces the number of large through holes, enhancing the physical properties and handleability of the carbon foam, making it suitable for applications like electrodes in redox flow batteries.
Implementation Method 1
A carbon foam is a material obtained, for example, by heat treating and carbonizing a melamine resin expanded body (foam) in an inert gas atmosphere
Data Source
AI summary
It is an object of the present disclosure to provide a thin-film carbon foam and a method of manufacture the same. It is another object of the present disclosure to provide a stack carbon foam having fewer through holes and a method of manufacturing the same. The carbon foam of the present disclosure is, for example, a stack carbon foam being a stack of at least two monolayer carbon foams stacked one another, each monolayer carbon foam comprising linear portions and node portions joining the linear portions, or a carbon foam comprising linear portions and node portions joining the linear portions, wherein the ratio of the number of large through holes having a diameter of 1 mm or more to the surface area of the carbon foam is 0.0003/mm2 or less.