Supergravity Directional Solidification Furnace for Single Crystal Alloys
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Solution Overview
Problem
There is a lack of equipment capable of directional solidification and melting under high-gravity and high-temperature conditions, which hinders the preparation of single crystal alloys with uniform solute distribution and refined microstructure.
Innovation Solution
A directional solidification melting furnace system that includes a supergravity test chamber, a high-temperature heating subsystem, and an air-cooling system, allowing for easy assembly and operation under high-speed-high-temperature coupling environments, enabling directional temperature gradient solidification and single crystal alloy preparation under high gravity conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If rapid solidification method is used to prepare single crystal alloys, then single crystal structure can be obtained, but the solidification structure becomes coarse and segregation occurs due to very low temperature gradient and solidification rate
Solution Approach 1:
The patent changes the temperature gradient parameter from very low (about 100 K/cm) to high (greater than 1000 K/cm) by implementing a directional solidification melting furnace with controlled heating zones. This parameter change transforms the solidification process to achieve fine-grained uniform structure while maintaining single crystal orientation, resolving the contradiction between obtaining single crystal structure and avoiding coarse solidification structure
Solution Approach 2:
The patent introduces a dynamic temperature control system with multiple heating zones that can independently adjust temperature gradients during the solidification process. This dynamic control allows real-time optimization of solidification rate and temperature gradient to prevent segregation while maintaining single crystal structure
2Manufacturing precision
If microgravity environment is used to suppress irregular heat and mass convection, then highly uniform solute distribution can be obtained, but the cost becomes high and industrialization is difficult
Solution Approach 1:
The patent replaces the mechanical approach of using microgravity environment with a thermal field control approach. By using a directional solidification melting furnace with precisely controlled temperature gradients, the patent achieves uniform solute distribution without requiring expensive microgravity facilities, thus making the process industrially viable
Solution Approach 2:
The patent changes the physical conditions from microgravity to controlled high-gravity environment with artificial temperature gradients. By creating a temperature gradient greater than 1000 K/cm, the patent suppresses irregular convection and achieves uniform solute distribution under terrestrial conditions, eliminating the need for expensive microgravity infrastructure
3Stability of the object's composition
If directional solidification process is used to prepare single crystal alloys, then grain boundaries can be eliminated or oriented parallel to principal stress axis, but the process requires precise temperature gradient control which is lacking in supergravity environment
Solution Approach 1:
The patent divides the heating system into multiple independent heating zones (upper heating zone, middle heating zone, lower heating zone) that can be controlled separately. This segmentation allows precise control of temperature gradients at different locations, enabling directional solidification without requiring a complex monolithic control system
Solution Approach 2:
The patent introduces a directional solidification melting furnace as an intermediary device between the supergravity environment and the solidification process. This furnace provides the necessary temperature gradient control (greater than 1000 K/cm) that compensates for the lack of natural temperature gradients in supergravity environments, enabling precise grain boundary orientation control
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 system ensures safe and stable operation, achieving uniform solute distribution and refined microstructure in single crystal alloys by controlling temperature gradients and suppressing irregular heat and mass convection, resulting in improved material performance.
Implementation Method 1
a high-temperature heating subsystem, a crucible and an air-cooling system mounted in the supergravity test chamber
Implementation Method 2
The heat generated by the heating element is evenly radiated to the heating furnace pipe
Implementation Method 3
an air-cooling system mounted in the supergravity test chamber
Implementation Method 4
suppressing irregular heat and mass convection
Implementation Method 5
The cooling air cools the bottom of the crucible, thereby forming a temperature gradient along the direction of supergravity
Implementation Method 6
a supergravity test chamber, as well as a high-temperature heating subsystem
Implementation Method 7
suppressing irregular heat and mass convection caused by gravity
Implementation Method 8
The heat generated by the heating element is evenly radiated to the heating furnace pipe
Data Source
AI summary
Provided is a supergravity directional solidification melting furnace equipment, including a supergravity test chamber and, mounted in the supergravity test chamber, a high-temperature heating subsystem, a crucible, and an air-cooling system. The supergravity test chamber is mounted with a wiring electrode and a cooling air valve device. The high-temperature heating subsystem is fixed in the supergravity test chamber. The crucible and the air cooling system are provided in the high-temperature heating subsystem. The high-temperature heating subsystem includes upper, middle, and lower furnaces, a mullite insulating layer, upper and lower heating cavity outer bodies, upper and lower heating furnace pipes, and a crucible support base. A high-temperature heating cavity is divided into upper and lower parts, is provided therein with a spiral groove, and is fitted with a heating element. The crucible support base is provided therein with a vent pipe channel into which a cooling air is introduced. The crucible and the air cooling system include air inlet and exhaust pipes, a cooling base, a cooling rate adjustment ring, the crucible, and an exhaust cover.