Fiber Interface Coating Slurry for Pre-Weaving Composite Processing
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Solution Overview
Problem
Current chemical vapor deposition (CVD) processes for applying fiber/matrix interface coatings in ceramic and metal matrix composites are costly, require additional processing steps, and are prone to damage, necessitating coatings to be applied after weaving and involving de-sizing operations.
Innovation Solution
A process that integrates an interface coating material comprising a sizing agent, ceramic powder, and optional dispersing, deflocculating, or surface wetting agents into the sizing operation before weaving, allowing for coating of fiber-based substrates before weaving, using a slurry and subsequent heat treatment to form a composite material.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If CVD coating process is used to apply interface coatings, then coating quality is improved, but manufacturing cost increases and process complexity increases
Solution Approach 1:
The patent combines the interface coating application with the existing sizing operation by incorporating ceramic powder into the sizing slurry. This merging of functions eliminates the need for separate CVD equipment and processing steps, thereby reducing manufacturing cost and process complexity while still achieving protective coating functionality.
Solution Approach 2:
The sizing slurry is given multiple functions: it serves both as a protective sizing agent for the fibers and as a source of ceramic coating material. This multi-functionality eliminates the need for separate coating operations and reduces overall process complexity and cost.
2Reliability
If CVD coating process is used to apply interface coatings, then coating quality is improved, but process complexity increases
Solution Approach 1:
The patent merges the coating application function into the existing sizing operation. By incorporating ceramic powder into the sizing slurry, the process eliminates the need for separate CVD equipment and processing steps, thereby reducing process complexity while maintaining coating functionality.
Solution Approach 2:
The sizing operation is transformed into a multi-functional process that simultaneously provides fiber protection and interface coating deposition. This eliminates the need for separate coating equipment and reduces overall process complexity.
3Reliability
If coating is applied after weaving, then handling damage is reduced, but additional processing steps are required
Solution Approach 1:
The patent applies the ceramic-containing sizing coating to the fibers before weaving. This preliminary action allows the coating to be deposited on loose fibers which are then woven into fabric, eliminating the need for subsequent de-sizing operations and additional processing steps.
Solution Approach 2:
Instead of the conventional approach of applying coating after weaving (to avoid handling damage), the patent inverts the sequence by applying the coating before weaving. The coating is then protected during handling by the woven structure itself, eliminating the need for de-sizing operations.
4Productivity
If coating is applied before weaving, then processing steps are reduced, but handling damage risk increases
Solution Approach 1:
The patent applies the ceramic-containing sizing coating to fibers before weaving. The coating is then protected during subsequent handling and weaving operations by the fiber matrix itself, maintaining coating integrity while enabling processing steps to be reduced.
Solution Approach 2:
The patent inverts the conventional sequence by applying coating before weaving. The woven fiber structure itself provides protection to the coating during handling, eliminating the need for de-sizing operations while maintaining coating integrity.
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 approach reduces costs by eliminating the need for expensive equipment and separate processing steps, enhances handling ease, and allows for cost-effective and efficient application of coatings prior to weaving, while maintaining the integrity of the interface coating.
Implementation Method 1
dipping at least one surface of a fiber-based substrate into a slurry to form a coated fiber-based substrate
Implementation Method 2
heat treating the coated fiber-based substrate to form a fiber-based substrate having an interface coating
Implementation Method 3
heat treating the coated fiber-based substrate to form a fiber-based substrate having an interface coating
Data Source
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AI summary
A process for applying an interface coating includes the step of applying an interface coating material upon at least one surface of a fiber-based substrate. The interface coating material may be composed of a sizing agent, a ceramic powder and optionally at least one of the following agents: a dispersing agent, a deflocculating agent or a surface wetting agent.