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Double-crucible induction heating furnace

A technology of induction heating furnace and double crucible, which is applied in the direction of crucible furnace, lighting and heating equipment, furnace, etc., can solve the problems of raw material pollution, easy perforation, etc., and achieve the effect of avoiding pollution

Inactive Publication Date: 2013-04-17
CHONGQING SILIAN OPTOELECTRONICS SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The invention solves the problem of easy perforation of precious metal crucibles such as iridium and platinum in the high-temperature induction melting process and the pollution of raw materials by common tungsten and molybdenum crucibles in the process of induction heating and melting, and greatly improves the qualified rate of products

Method used

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  • Double-crucible induction heating furnace
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] Embodiment 1: use tungsten crucible and iridium crucible cover to grow sapphire crystal (reference figure 1 ).

[0028] A tungsten crucible is used as the outer crucible 4 and an iridium crucible is used as the inner crucible 5 . First put the cleaned outer crucible 4 on the crucible support frame 8 of the intermediate frequency induction heating furnace, then put the cleaned inner crucible 5 into the outer crucible 4, and the center lines of the two crucibles and the center line of the heating furnace are in a straight line Above, the gap between the crucible walls is 1-15mm, the height of the outer crucible 4 and the inner crucible 5 are the same, the wall thickness of the outer crucible 4 is 5-10mm, and the wall thickness of the inner crucible 5 is 3-8mm.

[0029] Put 30kg of clean aluminum oxide raw material 7 into the inner crucible 5, install the sapphire seed crystal 2 on the lifting rod 1 and adjust the verticality, and finally cover and seal the furnace.

[...

Embodiment 2

[0033] Embodiment 2: use graphite crucible and platinum-rhodium crucible cover to grow lithium cholate crystal (reference figure 1 ).

[0034] A graphite crucible is used as the outer crucible 4, and a platinum-rhodium crucible is used as the inner crucible 5. Install the inner and outer crucibles as in the process of embodiment 1, the gap between the two crucible walls is 1-10mm, the height of the outer crucible 4 is 1 / 2 of the inner crucible 5, the wall thickness of the outer crucible 4 is 2-10mm, and the inner crucible 5 wall thickness 3-10mm.

[0035] Put 10 kg of clean lithium cholate raw material 7 into the inner crucible 5, install the lithium cholate seed crystal 2 on the lifting rod 1 and adjust the verticality, and finally cover and seal the furnace.

[0036] The air in the furnace was extracted as in the process of Example 1, and then filled with argon to keep the slight positive pressure in the furnace all the time.

[0037] Turn on the heating power supply, ra...

Embodiment 3

[0039] Embodiment 3: cover with molybdenum crucible and corundum crucible melting nickel-titanium alloy (reference figure 1 ).

[0040]A molybdenum crucible is used as the outer crucible 4, and a corundum crucible is used as the inner crucible 5. Install the inner and outer crucibles as in the process of Example 1, the gap between the two crucible walls is 5-15mm, the height of the outer crucible 4 is 1.5 times that of the inner crucible 5, the wall thickness of the outer crucible 4 is 3-6mm, and the inner crucible 5 walls 3-10mm thick.

[0041] Mix 5kg of high-purity nickel and 5kg of high-purity titanium evenly and put them into the inner crucible, cover and seal the furnace. Vacuumize and maintain the vacuum in the furnace within 0.01pa.

[0042] Turn on the heating power supply to melt the raw materials slowly (about 1450°C), then slowly cool down until the power of the induction coil 6 drops to 0, turn off the heating power supply, and after the furnace cools down to ...

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Abstract

The invention relates to a double-crucible induction heating furnace which comprises a barrel-shaped heat insulation body with an open top. A fire-resistant material and an induction coil are arranged in the heat insulation body, a crucible support frame is supported at the center of the barrel-shaped heat insulation body, and a crucible with the top provided with an opening is placed on the crucible support frame. The crucible comprises an outer crucible and an inner crucible, wherein the outer crucible has electrical conductivity and is resistant to high temperature, and the inner crucible is resistant to high temperature and is located in the outer crucible. The center line of the inner crucible and the outer crucible and the center line of the heating furnace are on the same straight line, and a gap between the inner crucible and the outer crucible is 1-20mm. The inner crucible and the outer crucible are adopted for the heating furnace, a heater and a raw material container are separated, the problems that precious metal crucibles made of iridium and platinum and the like are easily punched in the high-temperature induction smelting process and ordinary crucibles made of tungsten and molybdenum and the like cause pollution to raw materials in the induction heating smelting process are solved, and the pass rate of products is greatly improved.

Description

technical field [0001] The invention relates to a high-temperature melting device, in particular to a double-crucible induction heating furnace. Background technique [0002] Induction heating and melting technology is widely used in various crystal growth and metal smelting processes. It uses electromagnetic induction to heat the conductive crucible to melt the raw materials in the crucible, and then controls the cooling to achieve crystal growth or metal smelting. [0003] The traditional induction heating furnace has only one crucible. The crucible is not only a container for raw materials, but also a heater for equipment. During the heating and smelting production process, although the average power changes smoothly and slowly, the instantaneous power fluctuates continuously. Correspondingly, the crucible The temperature will also fluctuate with the power. At the same time, the electromagnetic induction lines are mainly concentrated on the outer surface of the crucible, ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F27B14/06C30B15/00C30B15/12
Inventor 黄贵军
Owner CHONGQING SILIAN OPTOELECTRONICS SCI & TECH
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