Metallic Glass Ingot Thermal Stability
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Solution Overview
Problem
Conventional ingots made from solid glass-forming alloys have limited dimensions and are prone to shattering during manufacturing and heating processes, leading to inefficiencies in casting processes due to their poor thermal conductivity and mechanical instability.
Innovation Solution
A method for producing ingots with a high critical casting thickness by pouring a homogeneous melt of a solid glass-forming alloy into a mold that maintains its temperature above the glass formation temperature for at least 5 seconds, ensuring the ingot is cooled below the glass transition temperature without additional pressure, resulting in a stable ingot that can be heated quickly without shattering.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional casting methods are used to produce ingots from solid glass-forming alloys, then the ingots can be manufactured with standard processes, but the ingots are prone to shattering during manufacturing and heating due to poor thermal conductivity and mechanical instability
Solution Approach 1:
The patent applies parameter changes by controlling the cooling rate and temperature profile during ingot solidification. Specifically, the melt is cooled at a controlled rate from the melting point through the glass transition temperature range, holding at each temperature for specified durations. This parameter control produces an ingot with a specific microstructure (amorphous outer layer with crystalline core) that exhibits enhanced mechanical stability and reduced shattering propensity while maintaining manufacturability through standard casting equipment.
2Productivity
If the mold is cooled quickly to achieve amorphous solidification, then the critical casting thickness is reduced, but the ingot dimensions and throughput are limited
Solution Approach 1:
The patent applies local quality by creating different microstructural zones within the same ingot. The outer region solidifies rapidly against the mold wall, forming an amorphous layer with high strength and scratch resistance. The inner region solidifies more slowly, forming a crystalline structure with good ductility. This spatial variation in microstructure allows the ingot to achieve larger dimensions suitable for high-volume production while maintaining the desirable properties of amorphous material in the surface layer.
Solution Approach 2:
The patent segments the solidification process into distinct stages: an initial rapid cooling phase that forms the amorphous outer layer, followed by a slower cooling phase that allows crystalline structure development in the core. This temporal and spatial segmentation of the solidification process enables production of larger ingots with controlled microstructure, thereby increasing productivity while maintaining manufacturing precision through differentiated zone control.
3Loss of time
If the ingot is heated quickly for thermal processing, then the processing time is reduced, but the ingot shatters due to thermal stresses
Solution Approach 1:
The patent applies parameter changes by implementing a multi-stage heating protocol that progressively increases temperature. The ingot is heated in steps: first to below the glass transition temperature to relieve internal stresses, then through the glass transition region at controlled rates, and finally to the target processing temperature. This parameter control allows significantly reduced total heating time compared to conventional slow heating, while preventing thermal shock-induced shattering through staged temperature increase that accommodates the material's changing thermal and mechanical properties.
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 method produces ingots that do not shatter during manufacturing or heating, allowing for faster thermal processing and increased throughput in casting processes, with the ingot maintaining a high crystalline proportion and minimal amorphous layer, reducing internal stresses and improving process efficiency.
Implementation Method 1
pouring a homogeneous melt of a solid glass-forming alloy into a mold that maintains its temperature above the glass formation temperature
Implementation Method 2
Cooling the melt below the glass transition temperature of the bulk glass-forming alloy while retaining the ingot
Data Source
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AI summary
Method for producing an ingot of a bulk glass-forming alloy, comprising the steps of: providing a homogeneous melt of a bulk glass-forming alloy, pouring the homogeneous melt into a mold, wherein the mold at the contact surface with the melt does not cool below the glass formation temperature of the alloy for at least 5 seconds, and cooling the melt below the glass transition temperature of the bulk glass-forming alloy while obtaining the ingot.