Closed monocrystalline growth furnace for molten salt method crystal growth

A technology of crystal growth and molten salt method, which is applied in the direction of crystal growth, single crystal growth, and melt from molten solvent, etc. It can solve the problems that cannot be achieved, cannot change the growth atmosphere, etc., and achieve optical performance improvement and UV non-toxicity removal. Intrinsic absorption, the effect of improving optical performance

Active Publication Date: 2013-01-16
TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the ordinary molten salt growth furnace described above performs crystal growth in an atm

Method used

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  • Closed monocrystalline growth furnace for molten salt method crystal growth
  • Closed monocrystalline growth furnace for molten salt method crystal growth
  • Closed monocrystalline growth furnace for molten salt method crystal growth

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] The closed single crystal growth furnace used for the molten salt method crystal growth of the present embodiment, such as figure 1 As shown, it comprises: a ceramic sleeve type furnace 1 with an inner diameter of 100mm (80mm-150mm is acceptable), a height of 300mm (300-500mm is acceptable), and the stainless steel outer furnace shell 3 is directly filled with refractory insulation cotton; Stainless steel outer furnace shell 3 inner diameter 350mm (300-700mm all can be), high 450mm (400-800mm all can); This stainless steel outer furnace shell 3 is the airtight barrel-shaped hollow double-layer stainless steel outer shell of double-layer hollow stainless steel making, its The barrel wall, barrel bottom and barrel cover are provided with connected closed flow passages; the closed flow passages are equipped with circulating cooling water; the air inlet 4 is located above the side wall of the stainless steel outer furnace shell 3, and the air inlet 5 is located on the stainl...

Embodiment 2

[0045] The closed single crystal growth furnace used for the molten salt method crystal growth of the present embodiment, such as figure 1 As shown, it includes: the inner diameter of the ceramic casing furnace 1 is 110mm (80mm-150mm), the height is 350mm (300-500mm is acceptable), and the refractory insulation cotton is directly filled between the stainless steel outer furnace shell 3; the stainless steel outer furnace shell 3 The inner diameter is 400mm (300-700mm is acceptable), the height is 500mm (400-800mm is acceptable), and the stainless steel outer furnace shell 3 is a closed barrel-shaped hollow double-layer stainless steel outer furnace shell made of double-layer hollow stainless steel. The bottom and the barrel cover are provided with a connected closed flow channel; the closed flow channel is equipped with circulating cooling water; the air inlet 4 is located above the side wall of the stainless steel outer furnace shell 3, and the air inlet 5 is located on the sid...

Embodiment 3

[0051] The airtight growth furnace used for growing molten salt single crystal in this embodiment, such as figure 2 As shown, it comprises: the inner diameter of the ceramic casing furnace 1 is 120mm (80mm-150mm), and the height is 380mm (300-500mm can be used), and a non-airtight stainless steel furnace shell 9 is set outside the refractory insulation cotton; the non-airtight There is a space layer between the stainless steel furnace shell 9 and the inner wall of the stainless steel outer furnace shell 3; the inner cavity of the stainless steel outer furnace shell 3, the non-sealed stainless steel furnace shell 9 and the ceramic sleeve type furnace 1 are filled with atmospheric gas; the ceramic sleeve A refractory and heat-preserving brick furnace cover 2 is placed above the tubular furnace 1, and a first vertical central through hole (Φ=16mm, 10-20mm is acceptable) is arranged in the middle, and there is a crystal growth observation hole on each side of it; the stainless ste...

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Abstract

A closed monocrystalline growth furnace for the molten salt method crystal growth comprises a ceramic bushing hearth wound with a resistance wire, a closed barrel-shaped hollow double-layer stainless steel outer furnace shell positioned outside the hearth, fireproof heat-insulation bricks/cotton arranged between the furnace shell and the hearth, a thermocouple traversing the furnace shell and extending to the outer wall of the hearth, and a fireproof heat-insulation brick furnace cover covering the upper port of the hearth, wherein the center and two sides of the furnace cover are provided with a first vertical central through hole and observation holes respectively; cooling water which flows in a circulating manner is contained in the furnace shell; the wall of the furnace shell is provided with an aspirating hole and an air inlet; the center of the cover of the furnace shell is provided with a second vertical central through hole opposite to the first vertical central through hole, and quartz glass windows; an atmospheric gas is filled to the inside of the furnace shell; a magnetofluid is arranged over the furnace shell and is connected with the furnace shell through a bellow; and a seed crystal rod traverses the magnetofluid, is connected with a universal knot, and is fixed on a crystal rotation head through the universal knot. The furnace enables crystals to grow under the atmospheric gas, the entry of impurities into the crystals to be reduced, the optical properties of the crystals to be improved, the extrinsic absorption generated by the crystals in an ultraviolet spectrum region to be removed, and the ultraviolet laser output power to be improved.

Description

technical field [0001] The invention belongs to a single crystal growth furnace in the field of crystal growth, in particular to a closed single crystal growth furnace for crystal growth by molten salt method. technical background [0002] The molten salt method is a common crystal growth method, which refers to the method of growing crystals in a molten salt solution at high temperature, mainly including the top seed crystal method, seed crystal kerosene method, etc. This method usually uses a ceramic sleeve as the furnace, surrounded by resistance wires as a heating method, the furnace is placed in a stainless steel furnace shell, the bottom is padded with insulating bricks, and the furnace is filled with refractory insulation cotton. The crucible is placed inside the furnace, and the gasket can be added or removed according to the growth needs, and the vertical position of the crucible can be adjusted. Two insulation bricks are added to the furnace mouth to maintain an a...

Claims

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Application Information

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IPC IPC(8): C30B9/12
Inventor 刘丽娟王晓洋刘春雷陈创天
Owner TECHNICAL INST OF PHYSICS & CHEMISTRY - CHINESE ACAD OF SCI
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