Metal Matrix Composite Substrate Plasma Treatment for Fiber-Safe Bonding

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Solution Overview

Problem

Existing mechanical and chemical surface preparation methods for metal matrix composite materials risk exposing underlying composite fibers, adversely affecting bonding properties.

Innovation Solution

A method involving initial plasma treatment followed by application of an adhesion promoter layer, such as a sol-gel layer, to prepare the surface without exposing fibers, enhancing bonding properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If mechanical surface preparation methods (sanding) are used to remove native oxide layer, then surface cleanliness is improved, but composite fibers are exposed and bonding properties deteriorate

Engineering Contradiction:

Improvebonding propertiesVSAvoidexposure of composite fibers

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces mechanical surface preparation methods (sanding, blasting) with chemical etching using acid solutions. This substitution allows removal of the native oxide layer without mechanical contact that would expose composite fibers, thereby maintaining bonding properties while achieving surface cleanliness.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the surface treatment approach from mechanical removal to chemical etching, fundamentally altering the mechanism of oxide layer removal. This parameter change enables selective removal of oxide while preserving the composite fiber structure underneath, thus resolving the contradiction between surface cleanliness and fiber exposure.

Inventive Principle:

Principle #35Parameter changes

2Reliability

If chemical surface preparation methods (acid etching) are used to remove native oxide layer, then surface cleanliness is improved, but composite fibers are exposed and bonding properties deteriorate

Engineering Contradiction:

Improvebonding propertiesVSAvoidexposure of composite fibers

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent replaces chemical etching with plasma treatment. This substitution allows oxide layer removal through plasma-enhanced chemical reactions that are more selective and controlled, removing oxide without the aggressive chemical etching that would expose composite fibers and compromise bonding properties.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent changes the surface treatment mechanism from conventional chemical etching to plasma treatment. This parameter change enables controlled oxide removal through plasma-induced chemical reactions, achieving surface cleanliness while preserving the integrity of underlying composite fibers and maintaining bonding properties.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If surface treatment is performed to remove oxide layer, then adhesion readiness is improved, but material layers are removed and composite fibers are exposed

Engineering Contradiction:

Improvesurface preparation efficiencyVSAvoidbonding properties

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent introduces plasma treatment as an intermediary process between surface cleaning and final coating. This intermediary plasma treatment step removes oxide layers through controlled plasma-enhanced chemical reactions, preparing the surface for adhesion while avoiding the fiber exposure problem of conventional methods.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the surface treatment approach to plasma treatment, which operates at a different energy and chemical parameter level than conventional methods. This parameter change enables selective oxide removal without aggressive material layer removal, thus improving ease of manufacture while preserving bonding properties.

Inventive Principle:

Principle #35Parameter changes

4Reliability

If plasma treatment is applied to clean and activate surface, then adhesion is improved without material removal, but process complexity increases

Engineering Contradiction:

Improveadhesion strengthVSAvoidsurface treatment process

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent replaces complex multi-step mechanical and chemical surface preparation with a single plasma treatment step. This substitution simplifies the overall process by consolidating oxide removal, surface cleaning, and activation into one plasma-based operation, thereby improving adhesion strength while reducing process complexity.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent makes plasma treatment a multi-functional surface preparation method that simultaneously performs oxide removal, surface cleaning, and activation for adhesion. This universality eliminates the need for separate treatment steps, improving adhesion strength while simplifying the overall process despite the advanced nature of plasma technology.

Inventive Principle:

Principle #6Universality (Multi-functionality)

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 cleans and activates the surface for improved adhesion without material removal, increasing bond strength and durability.

Implementation Method 1

initially treating one or more surfaces of a metal matrix composite substrate... said initially treating includes plasma treating (for example, atmospheric pressure plasma treating)

Methodology Applied

Scientific EffectPlasma: Plasma

Implementation Method 2

said initially treating includes laser ablating

Methodology Applied

Scientific EffectLaser ablation: Laser Ablation

Implementation Method 3

The adhesion promoter layer is or otherwise includes a sol-gel layer

Methodology Applied

Scientific EffectSol-gel process: Sol

Data Source

PatentUS20250313956A1Systems and methods for preparing metal matrix composite substrates for subsequent treatment

Publication Date: 2025.10.09 THE BOEING CO

AI summary

A method includes plasma treating one or more surfaces of a metal matrix composite substrate. The metal matrix composite substrate includes a metal matrix and composite fibers. After said plasma treating, the method also includes applying a sol-gel layer on the one or more surfaces of the metal matrix composite substrate.