Segmented Plasma Nitriding Apparatus for Localized Surface Treatment
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Solution Overview
Problem
Conventional plasma nitriding treatments incur high manufacturing costs due to excessive heating, gas consumption, and masking requirements, especially when treating large objects with localized nitriding regions, as the entire object is heated and housed in a nitrogen-containing gas environment.
Innovation Solution
A plasma nitriding apparatus with a surface treatment unit that houses only the specific surface treatment region within a treatment tank, using plasma to perform nitriding, and an outer container to expose the rest of the object, reducing heating costs and gas consumption by minimizing the plasma production area and masking needs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the entire treatment object is housed in a container filled with nitrogen-containing gas for plasma nitriding, then the nitriding treatment can be performed, but manufacturing cost increases due to excessive gas consumption, power consumption, and masking requirements
Solution Approach 1:
The patent divides the treatment space into two separate containers: an inner container for the nitriding treatment region and an outer container for the non-treatment region. This segmentation allows plasma and nitrogen-containing gas to be applied only where needed, reducing overall gas consumption and power requirements while maintaining effective nitriding treatment on the target surface.
Solution Approach 2:
The invention applies different treatment conditions to different regions: the inner container receives plasma nitriding treatment with nitrogen-containing gas and electric field, while the outer container remains exposed to ambient conditions or different gas atmosphere. This local quality approach ensures that energy and materials are concentrated on the treatment region only, minimizing waste and cost.
2Reliability
If the treatment object is heated as a whole in gas nitriding, then the nitride compound can be formed, but heating cost increases when only a small region needs nitriding
Solution Approach 1:
The patent uses a segmented container structure where only the inner container housing the treatment region is heated to the required temperature for nitride formation. The outer container and non-treatment portions of the object remain at lower temperatures, significantly reducing the total energy required for heating while still achieving effective nitriding on the target surface.
Solution Approach 2:
Heating is applied locally to only the region requiring nitriding treatment through the inner container, rather than heating the entire treatment object uniformly. This localized heating approach maintains the necessary temperature for nitride compound formation in the treatment zone while minimizing energy consumption overall.
3Manufacturing precision
If masking is applied to the region not to be nitrided, then selective nitriding is achieved, but manufacturing cost increases due to masking formation and removal work
Solution Approach 1:
The patent extracts the non-treatment region from the treatment environment by placing it in a separate outer container that is not exposed to plasma or nitrogen-containing gas. This eliminates the need for masking materials entirely, as the physical separation of containers provides the selectivity that masking would otherwise provide, thereby reducing manufacturing costs associated with masking application and removal.
Solution Approach 2:
The container structure itself acts as an intermediary barrier that selectively allows plasma and gas to reach only the inner treatment region while protecting the outer non-treatment region. This intermediary structure replaces the function of masking materials, providing selective protection without the costs and complexities of applying and removing masking layers.
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 manufacturing costs by efficiently targeting only the necessary regions for nitriding, minimizing gas usage, and lowering power consumption, while allowing for localized heating and nitriding treatments on large objects.
Implementation Method 1
electric discharge is generated between the anode and the cathode to produce plasma
Implementation Method 2
produce plasma. Nitrogen ions in the produced plasma collide with a surface of the treatment object
Implementation Method 3
the treatment object is heated and nitrogen originated from the nitrogen-containing gas is diffused on a surface of the treatment object
Implementation Method 4
nitrogen originated from the nitrogen-containing gas is diffused on a surface of the treatment object
Data Source
AI summary
A plasma nitriding apparatus includes: a surface treatment unit which includes a treatment tank to house part of a treatment object inclusive of a surface treatment region, and performs a nitriding treatment on the surface treatment region inside of the treatment tank by using plasma of a treatment gas; and an outer container which receives supply of the treatment gas, and houses the treatment object and the treatment tank so that a region of the treatment object other than the part is exposed from the treatment tank.