Aluminizing Metal Substrates via Oxygen-Containing Atmosphere Heating

Resolve Bottlenecks,
Find Innovative SolutionsGenerate Solutions

Solution Overview

Problem

Metals and alloys used in high-temperature applications are susceptible to reactions such as oxidation and corrosion, which negatively impact their chemical and mechanical properties, and existing coating processes require expensive and inconvenient controlled atmospheres.

Innovation Solution

A method for aluminizing metal substrates by applying a slurry with aluminum powder and binder, followed by heating in an oxygen-containing atmosphere above the melting point of aluminum, allowing for the formation of a strongly bound aluminum oxide coating without the need for a vacuum or reducing environment.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional coating processes are used to protect metal substrates from oxidation and corrosion, then protective coating is achieved, but expensive and inconvenient controlled atmospheres (vacuum or reducing atmosphere) are required

Engineering Contradiction:

Improveprotective coating qualityVSAvoidcontrolled atmosphere equipment

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The invention applies the opposite principle by intentionally introducing an oxygen-containing atmosphere during the heating step. The aluminum powder reacts with oxygen to form aluminum oxide coating, converting the traditionally harmful oxidizing environment into a beneficial coating-forming environment. This eliminates the need for expensive vacuum or reducing atmosphere equipment while achieving reliable protective coatings.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The invention converts the harmful effect of oxygen (which causes oxidation and corrosion of metal substrates) into a beneficial effect. By controlling the heating process in an oxygen-containing atmosphere, the aluminum powder reacts with oxygen to form a protective aluminum oxide coating, thereby using the oxidizing environment to protect the substrate rather than harm it.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

2Reliability

If conventional coating processes are used to protect metal substrates, then protective coating is achieved, but processing costs increase due to special equipment requirements

Engineering Contradiction:

Improveprotective coating qualityVSAvoidprocessing cost

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The invention eliminates the need for expensive controlled atmosphere equipment by using ambient air or oxygen-containing atmospheres. This dramatically reduces processing costs while maintaining reliable protective coating quality through the controlled reaction of aluminum powder with oxygen during heating.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

By converting the harmful oxidizing environment into a beneficial coating-forming process, the invention eliminates the need for expensive vacuum or reducing atmosphere equipment, thereby significantly reducing processing costs while achieving reliable protective coatings.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Reliability

If aluminum powder is heated in oxygen-containing atmosphere above melting point, then aluminum oxide coating is formed, but aluminum powder oxidizes and consumes

Engineering Contradiction:

Improvecoating protectionVSAvoidaluminum powder consumption

Core Design Contradiction:

ReliabilityVSLoss of substance

Solution Approach 1:

The invention converts the aluminum powder oxidation from a harmful loss into a beneficial coating-forming process. The controlled oxidation of aluminum powder in oxygen-containing atmosphere during heating produces the desired aluminum oxide protective coating, thereby transforming material consumption into protective functionality.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

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 results in high-quality, easily applied aluminum oxide coatings that provide protective surfaces for metal substrates, reducing processing costs and improving durability in high-temperature applications.

Implementation Method 1

a portion of the aluminum is oxidized by heating the slurry to a temperature greater than the melting point of the aluminum in an oxygen-containing atmosphere

Methodology Applied

Scientific EffectOxidation: Oxidation

Implementation Method 2

a portion of the aluminum is diffused into the substrate

Methodology Applied

Scientific EffectDiffusion: Diffusion

Data Source

PatentUS10378094B2Reactive coating processes

Publication Date: 2019.08.13 BATTELLE MEMORIAL INST

AI summary

Reactive coating processes are provided that can include providing a coating material, reacting the coating material to form a shell about the coating material, contacting the shelled coating material with a substrate to be coated, depositing the coating material from within the shelled coating material on the substrate, and removing the shells from the substrate. Coating materials may be deposited upon a substrate to be coated and reacted to form a shell about the coating material. The coating materials can be particles and a shell can be formed about each of the individual particles.