Radially Formed Slinger Ring for Grain Boundary Crack Resistance
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Solution Overview
Problem
The operating life of slinger rings in melt spinning apparatuses is limited by crack formation, primarily due to the presence of numerous grain boundaries running tangentially on the circumferential surface.
Innovation Solution
The main forming direction is shifted from axial to radial, reducing the number of grain boundaries in the tangential direction on the circumferential surface, and using refractory metal-based alloys like molybdenum-based alloys (e.g., TZM and MHC) with specific microstructural characteristics to enhance mechanical and high-temperature properties.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the main forming direction is in the axial direction, then the manufacturing process is simple, but the number of grain boundaries in the tangential direction increases, leading to crack formation
Solution Approach 1:
The main forming direction is inverted from the conventional axial direction to the radial direction. This inversion fundamentally changes the grain boundary orientation, causing grain boundaries to run primarily in the axial direction rather than the tangential direction, thereby eliminating the crack formation problem while maintaining manufacturing simplicity
Solution Approach 2:
The forming direction parameter is changed from axial to radial, which transforms the microstructure orientation. This parameter change results in grain boundaries being perpendicular to the circumferential surface instead of parallel to it, significantly improving crack resistance without complicating the manufacturing process
2Reliability
If the main forming direction is shifted to radial direction, then crack formation is reduced, but the manufacturing complexity increases
Solution Approach 1:
By inverting the forming direction to radial, the patent achieves improved reliability without actually increasing device complexity. The radial forming can be accomplished using conventional forging or rolling equipment adapted for radial deformation, making the process complexity increase minimal while the reliability improvement is substantial
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 configuration significantly reduces crack formation along grain boundaries, thereby extending the operating life and usability of the slinger rings by minimizing thermal stress-induced damage.
Implementation Method 1
a plurality of grain boundaries which run tangentially promotes the abovementioned crack formation. An axial main forming direction as in the prior art leads to greater crack formation, especially along the tangential direction, preferably on the circumferential surface. Relocating the main forming direction into the radial direction reduces the number of grain boundaries in the tangential direction on the circumference surface and thus the tendency for cracks to be formed.
Data Source
AI summary
A slinger, or slinger ring, for a melt spinning apparatus has a cylindrical, mechanically shaped main element that is composed of a refractory metal or a refractory metal-based alloy and has a circumferential surface running in a tangential direction. The circumferential surface is delimited in the axial direction by two end faces. A degree of deformation in the radial direction is greater than the degree of deformation in the axial direction.