High-Temperature Melting Device for Refractory Metals
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Solution Overview
Problem
Existing high-temperature melting devices for refractory metals face challenges such as high energy consumption, contamination with graphite, and inefficient processing due to the difficulty in handling refractory metals at high temperatures.
Innovation Solution
A high-temperature melting device utilizing multiple crucibles in parallel or serial configuration, equipped with a cooling device, a heater capable of heating above 1772 °C, and protective gas outputs to create a protective atmosphere, allowing for efficient heating and cooling of refractory metals without contamination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a single large graphite crucible is used to melt refractory metals, then the equipment size is reduced and operation is simplified, but the melt becomes contaminated with carbon from the graphite crucible
Solution Approach 1:
The invention divides the melting system into multiple separate crucibles (at least three) instead of using one large crucible. Each crucible contains a small amount of starting material and is heated independently. This segmentation prevents carbon contamination because the crucibles are heated so quickly that the crucible material itself does not melt or contaminate the melt, and the small melt volume minimizes contact with the crucible walls.
2Temperature
If a plasma flame is used to melt refractory metals in a rotating crucible, then melting capability is achieved, but voluminous encapsulated equipment is required and operating costs increase
Solution Approach 1:
The invention extracts the melting process from a complex encapsulated plasma flame system with rotating crucibles and protective gas flushing. Instead, it uses a simple open crucible configuration where a heater directly heats small amounts of starting material. The heating is so rapid that the crucible material remains solid and protective gas infrastructure is minimized, eliminating the need for voluminous encapsulated equipment.
3Temperature
If the crucible is heated to high temperatures for extended periods, then complete melting is achieved, but radiation losses increase quadruply with temperature
Solution Approach 1:
The invention applies rapid heating that rushes through the temperature range quickly. The heater heats the small amount of starting material in each crucible so rapidly that the high temperature state is maintained only briefly. This minimizes the time during which radiation losses occur, even though the temperature reaches levels where radiation losses would be significant. The short heating time results in minimal radiation losses despite the high temperatures required to melt refractory metals.
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 solution reduces energy consumption by achieving short heating times, minimizes contamination risks by avoiding graphite contact, and preserves the fine-grained structure of the refractory metal products, enhancing operational efficiency and product quality.
Implementation Method 1
heating the crucible contents by means of a heater to above 1772°C
Implementation Method 2
cooling the at least one crucible
Implementation Method 3
a protective gas dispenser for generating a protective gas atmosphere in the crucible
Data Source
Figure 1a~1c
Figure 1d~2
Figure 3
AI summary
The invention relates to a high-temperature device (10), in particular a high-temperature melting device (12) for melting, in particular, a refractory metal or a refractory metal compound, comprising a first crucible (14), a second crucible (14), at least a third crucible (14), a cooling device (18) for cooling the at least one crucible (14), at least one heater (24) configured for heating a crucible contents (48), and a protective gas dispenser (37) for generating a protective gas atmosphere in the crucible (14), wherein the heater (24) is configured for parallel and/or serial heating of a crucible contents (48) consisting of the refractory metal or the refractory metal compound.