Porous Ceramic Tool Body with Elastomeric Sealant for Composite Moulding
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Solution Overview
Problem
Existing ceramic tools for moulding composite materials face challenges with resin absorption and thermal expansion issues, particularly when working with high-temperature carbon fibre materials, leading to inefficiencies and potential damage during the moulding process.
Innovation Solution
A porous ceramic tool body with a low Coefficient of Thermal Expansion, coated with an elastomeric layer and epoxy sealant, is used in conjunction with a resinous material to inhibit resin absorption and facilitate high-temperature curing, ensuring efficient moulding and bonding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a porous ceramic tool body is used, then thermal stability and durability are improved, but resin absorption occurs leading to contamination and defects
Solution Approach 1:
A release agent layer is introduced as an intermediary between the porous ceramic tool body and the resinous material. This release agent prevents direct contact and resin absorption by the ceramic pores while allowing the tool to maintain its thermal stability and structural integrity during the curing process.
Solution Approach 2:
The tool body utilizes controlled porosity in the ceramic material to achieve thermal stability and durability. The porous structure provides thermal insulation and resistance to thermal shock, while the porosity is managed through surface treatment with release agents to prevent harmful resin absorption.
2Reliability
If high-temperature curing is performed, then complete curing of carbon fibre materials is achieved, but thermal expansion issues and tool damage occur
Solution Approach 1:
The ceramic tool body is specifically selected or engineered to have a low coefficient of thermal expansion that matches or is compatible with the carbon fibre composite material. This minimizes differential thermal expansion during high-temperature curing, preventing tool damage and ensuring dimensional stability of the moulded article.
Solution Approach 2:
The curing process utilizes controlled temperature parameters within the capabilities of the ceramic tool. The tool's thermal properties enable it to withstand the required curing temperatures while maintaining structural integrity, allowing complete curing of high-performance carbon fibre materials without excessive thermal expansion.
3Ease of operation
If resinous material is applied directly to the ceramic tool body, then moulding is simplified, but resin migrates into the porous structure causing defects
Solution Approach 1:
A release agent serves as an intermediary layer between the resinous material and the porous ceramic tool body. This layer prevents resin migration into the ceramic pores while maintaining the simplicity of the moulding process. The release agent can be easily applied and removed, preserving ease of operation without compromising manufacturing precision.
Solution Approach 2:
The release agent is applied to the ceramic tool body before the resinous material is applied. This preliminary action prepares the surface to prevent resin absorption, ensuring that when the resin is subsequently applied, it will not migrate into the porous structure, thereby preventing defects while maintaining process simplicity.
4Object-generated harmful factors
If the tool body is sealed to prevent resin absorption, then resin migration is reduced, but bonding between tool and moulded material deteriorates
Solution Approach 1:
The release agent acts as a controlled intermediary that prevents harmful resin migration into the ceramic pores while still allowing sufficient bonding between the tool and the moulded composite material. The release agent's properties are selected to provide the right balance between preventing resin absorption and maintaining adequate bonding strength for successful moulding.
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 solution provides a durable, efficient, and thermally stable ceramic tool that effectively prevents resin absorption and enhances bonding between the tool and the moulded material, enabling the use of both low and high-temperature cure resin systems while maintaining vacuum integrity.
Implementation Method 1
an elastomeric material to act to prevent absorption of resin from the resinous material into the tool body
Implementation Method 2
The surface of the ceramic material over which resinous material is laid may be sealed, for example with epoxy sealants. The sealant may inhibit movement of resin into the pores of the ceramic tool body during use.
Implementation Method 3
The ceramic material has preferably a low Coefficient of Thermal Expansion, preferably less than 10 ppm/° C. for use with carbon fibre moulding
Implementation Method 4
The resinous material may be located on the tool body in a curable condition, and is cured in situ on the tool body
Data Source
AI summary
A tool for use in forming molded articles, comprising a tool body formed of a ceramic material preferably porous with a porosity of between 40% and 60% and in the form of a foam. The tool body is profiled to define the mold surface(s) of the tool. The outer surface of the tool can be sealed with epoxy sealant to provide the mold surface(s) of the tool. An elastomeric layer can be applied to the surface(s) of the tool body and a resinous material, such as a fiber reinforced material, applied to the elastomeric layer, wherein the elastomeric layer inhibits the movement of resin from the resinous layer into the porous ceramic body, and the resinous layer defines the mold surface.