Sulfur-Modified FeNi Alloy Nitriding Efficiency

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Solution Overview

Problem

The nitriding efficiency in the production of FeNi superlattices is low due to thermal decomposition of nitrides, leading to increased production costs, as a large amount of ammonia is required in the nitriding treatment.

Innovation Solution

Incorporating sulfur into the FeNi alloy before nitriding treatment to suppress thermal decomposition and enhance nitriding efficiency, resulting in a high nitriding efficiency and reduced ammonia consumption.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If conventional nitriding treatment is performed on FeNi alloy, then FeNi superlattice is produced, but nitriding efficiency is low due to thermal decomposition of nitrides

Engineering Contradiction:

Improvenitriding efficiencyVSAvoidammonia consumption

Core Design Contradiction:

ProductivityVSLoss of energy

Solution Approach 1:

The invention changes the chemical composition parameter of the FeNi alloy by adding sulfur (0.01-10 mass%) before nitriding treatment. This parameter change suppresses thermal decomposition of nitrides during the nitriding process, thereby improving nitriding efficiency and reducing ammonia consumption without compromising the formation of FeNi superlattice structure.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If sulfur is added to FeNi alloy, then nitriding efficiency is improved and ammonia consumption is reduced, but alloy composition becomes more complex

Engineering Contradiction:

Improvenitriding efficiencyVSAvoidalloy composition complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The invention introduces a controlled parameter change by adding sulfur within a specific range (0.01-10 mass%). This controlled change improves nitriding efficiency while maintaining manageable alloy complexity through defined compositional boundaries.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite alloy system by combining FeNi base alloy with sulfur additive. This composite approach leverages the beneficial effect of sulfur on suppressing nitride decomposition while maintaining the core FeNi superlattice structure needed for magnetic properties.

Inventive Principle:

Principle #40Composite materials

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 achieves a significant improvement in nitriding efficiency, allowing for the production of high-quality FeNi superlattices with reduced ammonia usage and lower production costs.

Implementation Method 1

Incorporating sulfur into the FeNi alloy before nitriding treatment to suppress thermal decomposition and enhance nitriding efficiency

Methodology Applied

Scientific EffectThermal decomposition suppression:

Implementation Method 2

performing a nitriding treatment to an FeNi alloy containing sulfur to obtain a nitride containing Fe and Ni

Methodology Applied

Scientific EffectNitriding: Nitriding

Data Source

PatentUS20230099171A1L10 type iron-nickel ordered alloy and method of manufacturing l10 type iron-nickel ordered alloy

Publication Date: 2023.03.30 DENSO CORP

AI summary

An L10 type iron-nickel (FeNi) ordered alloy has an L10 type ordered structure and contains sulfur. The L10 type FeNi ordered alloy may have a sulfur content in a range from 0.01% by mass to 10% by mass. A manufacturing method of an L10 type FeNi ordered alloy includes performing a nitriding treatment to an FeNi alloy containing sulfur to obtain a nitride containing Fe and Ni.