CN212560511U - Cubic zirconium sapphire growth crystal furnace - Google Patents
Cubic zirconium sapphire growth crystal furnace Download PDFInfo
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- CN212560511U CN212560511U CN202020542569.1U CN202020542569U CN212560511U CN 212560511 U CN212560511 U CN 212560511U CN 202020542569 U CN202020542569 U CN 202020542569U CN 212560511 U CN212560511 U CN 212560511U
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Abstract
The utility model discloses a cubic zirconium sapphire growth crystal stove this crystal stove includes the furnace body, the furnace body external application is equipped with the response copper pipe that is used for the heating, the length of furnace body is greater than 1 with the width than. By utilizing the induction frequency characteristic of the high-frequency current, the length of the furnace body is increased on the premise of not influencing the melting of the central crystal, and the volume of the furnace body is increased, so that the yield is increased.
Description
Technical Field
The utility model relates to a growth crystal furnace for synthesizing cubic zirconium sapphire.
Background
The precious stone grade synthetic cubic zirconia is also called Sujiu diamond, homogeneous crystal, hardness up to 8.5, refractive index 2.17, temperature resistance of more than 2000 ℃, thus being widely applied to aerospace, optics, temperature resistant materials, jewelry and civil materials. In recent years, the market of domestic cubic zirconia crystal production is competitive, and the survival of the fittest is basically in a stable state. And the current production technology can be compared favorably with foreign production technologies, has competitiveness in both product yield and quality, and has considerable prospect.
At present, the main method for synthesizing the cubic zirconia crystal is a cold crucible method, and a circular high-frequency induction furnace is used all over the world. As shown in FIG. 1, the diameter of the induction furnace is generally 1m to 1.2m, then the raw material powder of the fused zirconium is fed, and the crystal growth is carried out by lifting the induction coil by a lifter by 3 mm to 12 mm. The reason why the diameter of the induction furnace in the prior art can only be 1.5m at most is that the larger the diameter is, the larger the center distance is, the more difficult the raw material positioned in the center is to melt, so that the crystal has poor transparency and quality and cannot meet the requirement.
The sapphire is produced by using the existing crystal furnace, the single furnace yield is low, single crystals are fewer, and the electricity cost is high. At present, the production process at home and abroad is almost the same, the bottleneck is basically reached, the center can not be melted and grown, and the method is also the main reason for limiting the development of enterprises for producing cubic zirconia crystals.
SUMMERY OF THE UTILITY MODEL
In view of this, the utility model provides a cubic zirconium sapphire growth crystal furnace utilizes the flat furnace body to replace current circular furnace body, can guarantee the melting of furnace body center raw materials and ensure crystal quality, can improve output under the unchangeable prerequisite of heating power again.
For solving above technical problem, the technical scheme of the utility model for adopt a cubic zirconium sapphire growth crystal stove, the induction cooker comprises a cooker bod, the furnace body external application is equipped with the response copper pipe that is used for the heating, the length of furnace body is greater than 1 with the ratio of width. By utilizing the induction frequency characteristic of the high-frequency current, the length of the furnace body is increased on the premise of not influencing the melting of the central crystal, and the volume of the furnace body is increased, so that the yield is increased.
As an improvement, the ratio of the length to the width of the furnace body is 2.
As a further improvement, the width of the furnace body is 1-1.2 m, the length is 2-2.4 m, and the height is 0.8-1 m.
As another further improvement, the cross section of the furnace body is oblong.
As an improvement, the induction copper pipe is vertically arranged, and the bottom of the induction copper pipe is connected with a header chassis; and a cooling water inlet and a cooling water outlet are arranged on the header base plate. So that the pressure of the cooling water in each induction copper pipe is consistent, and the cooling effect is ensured.
As an improvement, the top surface of the header base plate is provided with a boss. The traditional furnace body chassis is designed in a plane, and during production, powder with the thickness of about 15-20 cm is used for bottoming so as to prevent pollutants from burning out the chassis and the chassis by a molten material at a high temperature; the base plate of the novel long circular furnace is convex in the middle and concave at the periphery, the convex base plate part increases the area of cooling water and enhances the cooling property, so that the technical procedure of powder material bottoming is not needed, and pollutants on the base plate can flow to the peripheral concave base plate along with the molten liquid, so that the internal quality of the upper crystals cannot be influenced.
The utility model also provides a method for synthesizing cubic zirconium sapphire by utilizing the crystal furnace, which comprises the following steps:
A. proportioning powder materials; uniformly mixing and stirring zirconium dioxide powder, yttrium oxide and a rare element colorant according to a proportion;
B. adding materials; filling the prepared powder and lump materials into the furnace body according to a proportion;
C. igniting; placing a plurality of carbon rods in the furnace body, wherein the carbon rods are placed into a shape consistent with the furnace body; starting up and igniting;
D. melting; increasing the heating power to 500-1200 KW;
E. pulling crystal; pulling crystal by adopting a pulling method;
F. taking crystals; and taking out the crystal after the temperature in the furnace body is reduced to the normal temperature.
Preferably, in step B, the ratio of powder to lump material is 1: 2.
Preferably, in the step C, the distance between the carbon rod and the furnace edge is 15-25 cm.
Preferably, in the step D, the melting time is 24-30 hours.
Preferably, in the step E, the lifting speed of the induction copper pipe is 5-15 mm/h.
The utility model discloses an useful part lies in: the crystal furnace with the structure and the sapphire synthesis method with the steps utilize the flat furnace body to replace the existing round furnace body, and under the condition of constant power, the central melting of raw materials can be ensured, the crystal growth is good, and the capacity of the furnace body can be improved, so that the yield can be improved by about 2 times. The energy-saving effect is obvious, the power cost is greatly reduced, and the competitive advantage is obvious.
Drawings
FIG. 1 is a schematic structural view of a conventional crystal furnace.
FIG. 2 is a schematic structural view of the crystal growing furnace of the present invention.
Fig. 3 is a cross-sectional view of the present invention.
The labels in the figure are: 1 furnace body, 2 induction copper pipes, 3 cooling water inlets, 4 cooling water outlets, 5 header base plates and 6 bosses.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the present invention will be further described in detail with reference to the specific embodiments.
As shown in fig. 2 and 3, the utility model provides a cubic zirconium sapphire growth crystal furnace, which comprises a furnace body 1, wherein an induction copper pipe 2 for heating is arranged outside the furnace body 1, the induction copper pipe 2 is vertically arranged, and the bottom of the induction copper pipe is connected with a header chassis 5; and a cooling water inlet 3 and a cooling water outlet 4 are arranged on the header base plate 5. The ratio of the length to the width of the furnace body 1 is greater than 1. Preferably, the ratio of the length to the width of the furnace body 1 is 2. Specifically, the width of the furnace body 1 is 1-1.2 m, the length is 2-2.4 m, and the height is 0.8-1 m.
The cross section of the furnace body 1 is oblong. The shape is an oval shape, and a shape formed by joining two semicircles and a rectangle. The diameter of the two semi-circles is equal to the short side of the rectangle.
The top surface of the header base plate 5 is provided with a boss 6. The shape of the boss 6 is consistent with that of the furnace body.
The utility model also provides a method for synthesizing cubic zirconium sapphire by using the crystal furnace, which comprises the following steps:
A. proportioning powder materials; uniformly mixing and stirring zirconium dioxide powder, yttrium oxide and a rare element colorant according to a proportion;
B. adding materials; filling the prepared powder and the lump material into the furnace body according to the ratio of 1: 2;
C. igniting; placing a plurality of carbon rods in the furnace body, wherein the carbon rods are placed in a shape consistent with that of the furnace body, and the distance between the carbon rods and the furnace edge is 15-25 cm, namely the carbon rods are placed in a small long round shape; after the placement is finished, starting up and igniting;
D. melting; according to the size of the crystal furnace, the heating power is increased to 500-1200 KW; the melting time is 24-30 hours.
E. Pulling crystal; pulling crystal by adopting a pulling method; the lifting speed of the induction copper pipe is 5-15 mm/h.
F. Taking crystals; and taking out the crystal after the temperature in the furnace body is reduced to the normal temperature.
The distance between the ignition melting magnetic field of the traditional circular furnace and the peripheral electromagnetic induction coil is equal and far, so that in the melting process, the electric power and the process time can only be increased to slowly melt materials, the melting time is too long, the non-uniform melting temperature of powder in the furnace body can be influenced, the central melting material in the furnace cannot be well crystallized, polycrystal or broken crystal is generated, and the polycrystal or the broken crystal cannot be well crystallized into monocrystal; the distance between the ignition melting magnetic field of the novel long circular furnace and the peripheral electromagnetic induction coil is equal and short, so that the process time required by melting powder in the furnace body can be accelerated and shortened under the condition of equal power in the melting process, the time is saved, and the redundant energy consumption is reduced.
The above is only a preferred embodiment of the present invention, and it should be noted that the above preferred embodiment should not be considered as limiting the present invention, and the protection scope of the present invention should be subject to the scope defined by the claims. It will be apparent to those skilled in the art that various modifications and enhancements can be made without departing from the spirit and scope of the invention, and such modifications and enhancements are intended to be within the scope of the invention.
Claims (5)
1. The utility model provides a cubic zirconium sapphire growth crystal stove, includes the furnace body, the furnace body is enclosed by a plurality of response copper pipes that are used for the heating, its characterized in that: the ratio of the length to the width of the furnace body is more than 1; the induction copper pipe is vertically arranged, and the bottom of the induction copper pipe is connected with the header chassis; and a cooling water inlet and a cooling water outlet are arranged on the header base plate.
2. The cubic zirconium sapphire growth crystal furnace of claim 1, wherein: the ratio of the length to the width of the furnace body is 2.
3. The cubic zirconium sapphire growth crystal furnace of claim 1, wherein: the width of the furnace body is 1-1.2 m, the length is 2-2.4 m, and the height is 0.8-1 m.
4. The cubic zirconium sapphire growth crystal furnace of claim 1, wherein: the cross section of the furnace body is oblong.
5. The cubic zirconium sapphire growth crystal furnace of claim 1, wherein: the top surface of the header base plate is provided with a boss.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202020542569.1U CN212560511U (en) | 2020-04-14 | 2020-04-14 | Cubic zirconium sapphire growth crystal furnace |
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| CN202020542569.1U CN212560511U (en) | 2020-04-14 | 2020-04-14 | Cubic zirconium sapphire growth crystal furnace |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304735A (en) * | 2020-04-14 | 2020-06-19 | 四川省久宝晶体科技有限公司 | Cubic zirconium sapphire growth crystal furnace and cubic zirconium sapphire synthesis method |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111304735A (en) * | 2020-04-14 | 2020-06-19 | 四川省久宝晶体科技有限公司 | Cubic zirconium sapphire growth crystal furnace and cubic zirconium sapphire synthesis method |
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