Rod-Supported Gas Discharge Chamber Mounting Against Fretting Corrosion
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Fretting corrosion between the support device and the gas discharge chamber wall in excimer light sources leads to material deterioration, particle generation, and increased vibrations, causing instability in the light beam and potential catastrophic failure of the bearing.
Innovation Solution
A support device with a cup and a plurality of rods is designed to reduce contact area, where the rods contact the chamber wall while the cup does not, allowing generated particles to escape and reducing frictional engagement, using hardened, polished steel rods to minimize abrasion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the support device uses a cup structure that contacts the chamber wall over a large area, then the support device provides stable support, but fretting corrosion increases leading to particle generation and bearing failure
Solution Approach 1:
The support device is segmented into a cup structure with multiple rods arranged on its outer surface. The rods are spaced apart to create gaps, dividing the contact interface into discrete points rather than a continuous surface. This segmentation allows particles generated by fretting corrosion to escape through the gaps while maintaining structural support, directly resolving the contradiction between stability and corrosion resistance
Solution Approach 2:
The rod structures are made of hardened and polished steel, giving them locally enhanced wear-resistant properties compared to the cup material. This local quality enhancement concentrates the wear resistance exactly where contact with the chamber wall occurs (at the rods), while the cup body can be made of other suitable materials, allowing differential material properties to address the specific corrosion problem at the contact interface
2Object-generated harmful factors
If the support device minimizes contact area with the chamber wall, then fretting corrosion is reduced, but the support stability and load-bearing capacity decrease
Solution Approach 1:
The contact interface is segmented into multiple discrete rod elements rather than a continuous surface. This segmentation reduces the total contact area compared to a solid cup, minimizing fretting corrosion, while the distributed arrangement of rods provides adequate support stability through multiple contact points that collectively bear the load
Solution Approach 2:
The support device uses a composite structure combining a cup body material with hardened and polished steel rod surfaces. The cup provides structural integrity and support, while the hardened steel rods provide wear-resistant contact surfaces. This composite approach allows the device to maintain strength and stability while minimizing corrosion at the contact interface
Data Source
AI summary
A light source apparatus (100) includes: a chamber (101) having a chamber wall (103) defining an opening (107); and a support apparatus (110) including a support device (111) positioned within the opening of the chamber wall. The support device includes: a cup (112) having an inner surface (114) configured to retain a movable apparatus and an outer surface (116) having a first outer diameter; and a plurality of rods (118) arranged at the outer surface of the cup such that the arrangement of the plurality of rods defines a second outer diameter, the second outer diameter greater than the first outer diameter. The chamber wall is configured to hold the support device such that the chamber wall contacts the plurality of rods when the support device is positioned within the opening of the chamber wall, and the outer surface of the cup does not contact the chamber wall.