Furnace hearth set for synthesizing crystals by using flame fusion method

Abstract

The invention discloses a furnace hearth set for synthesizing crystals by using a flame fusion method. The furnace hearth set comprises a material supplying device, a hydrogen supplying system, a combustion chamber, a furnace hearth, a supporting post and a descending mechanism; a furnace hearth crystallizing area of the inner cavity of the furnace hearth has a fusiform curve structure; the cross section of the inner cavity of the furnace hearth is of an elliptic structure; the axial length of the inner cavity of the furnace hearth crystallizing area is greater than the axial lengths of an upper port and a lower port of the furnace hearth; and a spout of a spray nozzle on the combustion chamber is designed to have an elliptic structure matched with the furnace hearth. The furnace hearth set has the advantages that: the inner cavity of the furnace hearth is designed to have a circular or elliptic fusiform curve structure, so that oxyhydrogen flame flows freely and smoothly and a vortex flow in the inner cavity of the furnace hearth is avoided; the spout of the spray nozzle in the combustion chamber is designed to be matched with the furnace hearth, so that the shape of the furnace hearth is similar to that of the oxyhydrogen flame and a temperature field which has the advantage that the crystal is synthesized more uniformly compared with that of the conventional flame fusion method is constructed; the longitudinal temperature gradient and the transverse temperature gradient are small; and the furnace hearth set is suitable for producing large-diameter crystals and circular, elliptic and oblate crystals with small defects and good hair degree.

Description

technical field [0001] The invention relates to a furnace group for crystal synthesis, in particular to a furnace group for synthesizing crystals by flame melting method. Background technique [0002] At present, the flame fusion method synthesizes the crystal furnace group, such as figure 1 Shown: [0003] Oxygen enters combustion chamber 2 with main (auxiliary) material through nozzle 21, and H 2 into the combustion chamber (10), H 2 with O 2 proportional to the H 2 , O 2 After the combustion chamber 2 is mixed, the hydrogen-oxygen flame with powder is formed, and the powder is brought into the furnace 3 at the same time. The powder melts through the high temperature zone between 100mm and 150mm, and continuously falls on the crystal 41. At the same time, The lowering mechanism 5 drives the supporting column 4 and the continuously growing crystal 41 to descend, and grows into a crystal of a required size within a specified time. [0004] Due to the traditional unive...

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Problems solved by technology

[0004] Due to the traditional universal furnace 3 chambers and flame Figure 5 The shapes of the crystals are inconsistent, and the flame tends to generate eddy currents at the turning point 32 of the inner wall of the furnace, resulting in a large lateral temperature and vertical temperature gradient in the furnace, and the crystal diameter is not easy to grow, and the produced crystals have many internal defects.

Difficult to meet the requirements of synthesizing round crystals with a diameter of more than 40mm, especially oval or oblate crystals

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