Atmospheric Plasma Tunnel for Inline Oxide Reduction

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Solution Overview

Problem

Existing methods for reducing oxides on workpiece surfaces using low-pressure plasma are cumbersome to integrate into continuous production operations due to loading and unloading requirements, and atmospheric plasma methods often lead to re-oxidation and surface modification, making them unsuitable for inline use.

Innovation Solution

An apparatus with a treatment tunnel, plasma nozzle, and transport device that generates an atmospheric plasma jet within a controlled environment, allowing for inline oxide reduction by exposing workpieces to a hydrogen-containing gas, while maintaining a reducing atmosphere to prevent re-oxidation.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Manufacturing precision

If low-pressure plasma is used to reduce oxides on workpiece surfaces, then oxide reduction is achieved, but integration into continuous production becomes complex due to loading and unloading operations

Engineering Contradiction:

Improveoxide reduction qualityVSAvoidintegration complexity

Core Design Contradiction:

Manufacturing precisionVSDevice complexity

Solution Approach 1:

The patent changes the pressure parameter from low-pressure plasma to atmospheric pressure plasma, enabling continuous inline processing without complex loading and unloading operations. This parameter change allows the plasma treatment to be integrated directly into continuous production lines while maintaining oxide reduction effectiveness.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent implements continuous oxide reduction by transporting workpieces through a treatment tunnel where atmospheric plasma is continuously applied. This eliminates the discontinuous loading and unloading steps required in low-pressure plasma methods, achieving seamless integration into continuous production operations.

Inventive Principle:

Principle #20Continuity of useful action

2Ease of operation

If atmospheric plasma is used to reduce metal surfaces, then processing simplicity is improved, but re-oxidation and surface modification occur that diminish reduction effects

Engineering Contradiction:

Improveprocessing simplicityVSAvoidoxide reduction quality

Core Design Contradiction:

Ease of operationVSManufacturing precision

Solution Approach 1:

The patent creates a controlled inert atmosphere inside the treatment tunnel by removing oxygen and introducing reducing gases (such as hydrogen or carbon monoxide). This protects the reduced metal surface from re-oxidation during and after the plasma treatment, maintaining the quality of oxide reduction while using atmospheric pressure processing.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

Solution Approach 2:

The patent applies preliminary reducing atmosphere preparation before the plasma treatment by pre-introducing reducing gases into the treatment tunnel. This preliminary action ensures that the environment is already prepared to prevent re-oxidation during the subsequent plasma treatment and cooling phases.

Inventive Principle:

Principle #10Preliminary action

3Productivity

If workpiece surfaces are exposed to atmospheric plasma jet, then oxide reduction is intensified, but heat input increases causing surface modification and re-oxidation

Engineering Contradiction:

Improveoxide reduction efficiencyVSAvoidheat-induced re-oxidation

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent uses a reducing atmosphere composed of inert or reducing gases (hydrogen, carbon monoxide, nitrogen) inside the treatment tunnel to prevent re-oxidation of the heated metal surface. This allows the plasma jet to provide intensive heat input for effective oxide reduction without the harmful effect of immediate re-oxidation that would occur in atmospheric air.

Inventive Principle:

Principle #39Inert atmosphere (Inert environment)

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 apparatus effectively reduces oxides on workpiece surfaces, enhances surface wettability, and prevents re-oxidation, facilitating continuous manufacturing processes with improved soldering capabilities and reduced environmental impact.

Implementation Method 1

a plasma nozzle (84) which is configured to generate an atmospheric plasma jet (88)

Methodology Applied

Scientific EffectPlasma: Plasma

Implementation Method 2

a reduction gas supply (74) which is configured to introduce a reduction gas (23) into the reaction region (82)

Methodology Applied

Scientific EffectChemical reduction: Reduction

Data Source

PatentUS20250220800A1Apparatus and Method for the Reduction of Oxides on Workpiece Surfaces

Publication Date: 2025.07.03 PLASMATREAT GMBH

AI summary

The invention relates to an apparatus for the reduction of oxides on workpiece surfaces, with a treatment tunnel extending from an inlet opening to an outlet opening, with a reaction region arranged within the treatment tunnel with a plasma nozzle which is configured to generate an atmospheric plasma jet, with a reduction gas supply configured to introduce a reduction gas into the reaction region, and with a transport device configured to transport workpieces through the treatment tunnel. The plasma nozzle is arranged and configured in such a way as to introduce the atmospheric plasma jet into the reaction region during operation. The invention further relates to the use of the apparatus and a method for the reduction of oxides on workpiece surfaces.