Remote Cooling of Directionally Solidified Ingot via Transport Mold
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Solution Overview
Problem
Existing methods for directional solidification of multi-crystalline materials in open bottom cold crucible induction furnaces do not effectively manage the cool-down process of hot solid ingots, leading to potential 'shrink defects' due to uncontrolled volume contraction and cooling rates.
Innovation Solution
The process involves melting feedstock in an open bottom cold crucible electric induction furnace, allowing the hot purified multi-crystalline solid to exit and undergo remote passive cool-down in a mold without external heating or cooling, using thermal monitoring and insulation to control the cooling rate and prevent defects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the hot solid ingot is cooled down immediately after exiting the furnace, then the cooling process is faster, but shrink defects occur due to uncontrolled volume contraction and cooling rates
Solution Approach 1:
A mold is introduced as an intermediary component between the furnace and the cooling environment. The mold contains the hot solid ingot during the cool-down process, providing a controlled environment that manages heat dissipation rates. This intermediary structure enables faster cooling while preventing uncontrolled volume contraction that leads to shrink defects, as the mold confines and directs the solidification process.
2Device complexity
If the cool-down process is performed in the furnace, then the process is simpler, but the cooling rate cannot be controlled precisely leading to defects
Solution Approach 1:
The cooling process is segmented into distinct phases: initial cooling within the furnace environment, then transfer to a separate mold for controlled cool-down. This segmentation allows the process to benefit from both the simplicity of furnace-based cooling and the precise control of a dedicated cooling mold. The separation enables independent optimization of each stage without compromising the other.
3Device complexity
If manual handling of the hot ingot is used, then the process is simpler, but manpower requirements increase and safety risks arise
Solution Approach 1:
The mold system is designed to receive and retain the hot solid ingot automatically as it exits the furnace, eliminating the need for manual handling. The mold's positioning and the ingot's gravity-driven movement into the mold create a self-service transfer mechanism. This reduces manpower requirements and associated safety risks while maintaining process simplicity.
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 method ensures controlled directional solidification, minimizing 'shrink defects' by allowing a controlled cool-down of the multi-crystalline solid, resulting in high-purity ingots with reduced manpower requirements and efficient process automation.
Implementation Method 1
open bottom cold crucible induction furnace
Implementation Method 2
melted in the cold crucible
Implementation Method 3
passive cool-down
Implementation Method 4
remote passive cool-down
Implementation Method 5
directional solidification of the hot purified multi-crystalline solidified material
Implementation Method 6
solidified hot mass of the multi-crystalline material
Data Source
AI summary
Solid or semi-solid feedstock is melted in an open bottom electric induction cold crucible furnace. Directionally solidified multi-crystalline solid purified material continuously exits the bottom of the furnace and may optionally pass through a thermal conditioning chamber before being gravity fed into a transport mold where an ingot of the purified multi-crystalline solid material is transported to a remote holding area after the transport mold is filled with the multi-crystalline material and cut from the continuous supply of material. Cool down of the ingot is accomplished remote from the open bottom of the electric induction cold crucible furnace.