CN102849920B - Optical glass melting method and optical glass melting device used for method - Google Patents
Optical glass melting method and optical glass melting device used for method Download PDFInfo
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- CN102849920B CN102849920B CN201110185586.XA CN201110185586A CN102849920B CN 102849920 B CN102849920 B CN 102849920B CN 201110185586 A CN201110185586 A CN 201110185586A CN 102849920 B CN102849920 B CN 102849920B
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Abstract
The title of the invention is an optical glass melting method and an optical glass melting device used for the method. The invention belongs to the technical field of optical glass melting and mainly provides a method for melting glass and a device for controlling high quality of flowed molten glass. The melting method is mainly characterized in that: (1) putting optical glass raw materials of phosphatic, columbate and bismuthate into a crucible for high-temperature fusion, clarification and homogenization so as to obtain molten glass; (2) placing the above crucible together with the molten glass into an insulation area of a smelting furnace; and (3) leading out the molten glass at an intermediate area below the central surface layer and over the bottom of the crucible from the smelting furnace through a conduit so as to prepare an optical glass strip material. The furnace bottom is a liftable furnace bottom, and a guiding control device is a flow guide tube made of platinum or platinum alloy. The optical glass manufactured in the invention has high transmittance, and its refractive index nd is not less than 1.8. The optical glass has characteristics of no pollution of metal Pt and Au particles and no generation of streaks in the strip material, and is mainly used to manufacture phosphatic, columbate and bismuthate optical glass strip materials.
Description
Technical field
The invention belongs to opticglass smelting technique field.Be specifically related to a kind of method and the glass derivation control device that are suitable for the melting of opticglass pottery.The opticglass adopting this mode to produce can avoid the pollutions to opticglass such as metal particle (Pt, Au), and extends pot life.
Background technology
What employing produced by traditional opticglass is ceramic smelting technique.Namely the crucible of melting is made by materials such as clay, corundum, quartz, and crucible is placed in the High Temperature Furnaces Heating Apparatus of about 1500 DEG C, adds admixtion in crucible, through processes such as melting, clarification, homogenizing, obtains the glass metal of melting.Take out crucible again and pour glass melt in mould cooling forming.Yield rate is low, glass quality is low, optical homogeneity is unstable owing to disturbing by many factors for this mode of production, and batch is little, has substantially been eliminated on opticglass is produced.
Method for mass production of high-quality optical glass, the most common and most mature platinum continuous melting the whole way.Nearly all opticglass can be produced in this way.Platinum has anti-erosion, high temperature resistant, the extended feature such as good, is the optimal container for opticglass melting.
Along with the development in little to volume, the large wide-angle of digital product, high-resolution direction, require that opticglass has the performances such as extra-high specific refractory power, high permeability, low softening temperature.Optical glass composition of the raw material tends lanthanide rare earths, phosphate, niobate and bismuth system, compared borates, silicates former system of erosion platinum containers more serious, especially bismuth glass, because of its extremely high refractive index and low-pressure precision softening temperature is the preferred material for the optical element, but it is particularly serious erosion of platinum, can hardly be melted using a platinum crucible, the crucible of molten alloy using only platinum and gold.Even if the glass may be platinum or a platinum alloy crucible and melted, but because during melting Pt, Au and other fine metal particles into the molten glass contaminated glass, colloidal coloring produced, resulting in greatly reduced the transmittance of the glass.
To the optical element for laser apparatus, if there is the existence of the metal particles such as Pt, Au inside, element can be caused operationally interior fried, time serious, make laser apparatus scrap.Not only require that transmitance is high for the optical element of laser apparatus, the pollution of metal (Pt, Au) particulate can not be had simultaneously.
How to solve the problem? Been observed that the above-described optical glass of platinum or platinum alloy crucible erosion occurs in the high-temperature melting glass batch phase, especially phosphates optical glass, the higher the moisture content of the batch by a platinum crucible erosion more serious.It is painted that these metal particles incorporate generation colloid in vitreum, glass quality worsened, directly affects the transmitance of glass.People contemplate the way of substep melting.That first quartz or glass container clinker preparation corundum crucible, then every batch of clinker was mixed into the light of clinker needed to be added to platinum or platinum alloy vessel for secondary smelting.The opticglass that this mode is produced meets the requirement of present stage digital product.But still to add a small amount of admixtion during secondary smelting, therefore can only say that the pollution of metal particle in the opticglass that this mode is produced greatly reduces, but also thoroughly not eradicate.And secondary smelting mode makes production cost improve.
Summary of the invention
The present invention proposes to solve the problem.Object is to be provided for the manufacture method of melting high-quality phosphoric acid salt, niobate and bismuthate opticglass and the optical glass smelting device for the method.
The technical solution of a kind of opticglass of the present invention melting method is: a kind of opticglass melting method, for melting high-quality phosphoric acid salt, niobate and bismuthate opticglass, it is characterized in that comprising following processing step:
1. first phosphoric acid salt, niobate and bismuthate Optical Glass Materials are put into the quartz being arranged in smelting furnace melt region or aluminum oxide corundum material crucible carries out high-temperature fusion, clarification, all changes into glass metal;
2. then above-mentioned crucible is placed in smelting furnace soak zones together with glass metal;
3. optical glass strip material is made finally by conduit by outside the glass metal of the region intermediate below crucible mesexine, more than bottom derivation smelting furnace.
The technical solution that the present invention is used for the optical glass smelting device of aforesaid method is: a kind of optical glass smelting device, comprise the smelting furnace body of heater, heating member, crucible and the derivation control device that are provided with charging opening, it is characterized in that: described heating member comprises melting heating member and Heat preservation body, melting heating member is positioned at lower portion of furnace body, and Heat preservation body is positioned at upper of furnace body; Bottom of furnace body is liftable furnace bottom; Crucible is quartz or aluminum oxide corundum material crucible; Derive the thrust-augmenting nozzle that control device comprises platinum through upper of furnace body furnace wall or platinum alloy material, this thrust-augmenting nozzle is positioned at the pipe overcoat that furnace interior divides aluminum oxide corundum material sleeve pipe, and the pipe being positioned at the outer part of stove is wrapped with insulating cotton.
Thrust-augmenting nozzle described in technical solution of the present invention is positioned on the outer thrust-augmenting nozzle outer wall partly of stove and is welded with at least one group of electrode slice, preferably 2 ~ 5 groups of electrode slices.
Crucible sleeve cylinder is provided with outside crucible described in technical solution of the present invention.
On the crucible being in high temperature melting tabetisol described in technical solution of the present invention along lower than under charging opening along 2 ~ 10 centimetres.
The inlet end of the thrust-augmenting nozzle described in technical solution of the present invention is positioned at 1/5 ~ 1/4 height at the bottom of the crucible under keeping warm mode, apart from sidewall of crucible 1/4 ~ 1/3 diameter place.
Water conservancy diversion pipe furnace Outboard Sections described in technical solution of the present invention has at least a place to be welded with taper reducing communicating pipe, and preferably 2 ~ 3 places are welded with taper reducing communicating pipe.
Water conservancy diversion pipe furnace Outboard Sections described in technical solution of the present invention can be welded with shunting communicating pipe.
Above glass metal in crucible due to material surface component volatilization and its specific refractory power of action of gravity a little less than required specific refractory power, also remaining have the bubble do not discharged.And the glass metal of crucible bottom is subject to action of gravity equally, its specific refractory power is a little more than required specific refractory power, and heavier refractory materials Impurity deposition is in crucible bottom.So the glass metal quality of upper surface and bottom is bad in crucible, be not suitable for using.Optical homogeneity is stable, bubble-free, pure high quality glass liquation are in crucible central region.
The present invention is owing to adopting liftable furnace bottom, at lower portion of furnace body, melting heating member is set, in upper of furnace body, Heat preservation body is set, crucible is quartz or aluminum oxide corundum material crucible, be arranged on liftable furnace bottom, the thrust-augmenting nozzle of platinum through furnace wall or platinum alloy material is provided with in upper of furnace body, this thrust-augmenting nozzle is positioned at the pipe overcoat that furnace interior divides aluminum oxide corundum material sleeve pipe, the pipe being positioned at the outer part of stove is wrapped with insulating cotton, thus can realize first by phosphoric acid salt, niobate and bismuthate Optical Glass Materials put into the quartz that is arranged in smelting furnace melt region or aluminum oxide corundum material crucible carries out high-temperature fusion, clarification, all change into glass metal, then above-mentioned crucible is placed in smelting furnace soak zones together with glass metal, finally by conduit by below crucible mesexine, the glass metal of region intermediate more than bottom is derived outside smelting furnace and is made optical glass strip material, this optical glass strip material is without Pt metal, Au particle contamination, there is high permeability, refractive index n d is not less than 1.8.The present invention has a high transmittance, refractive index nd of not less than 1.8, no metal Pt, Au particle pollution, no inner strip fringes without platinum crucible of molten gold alloy to improve the crucible life characteristics.The present invention is mainly used in the manufacture of phosphoric acid salt, niobate and bismuthate optical glass strip material.
Accompanying drawing explanation
Fig. 1 is the structural representation that crucible of the present invention is in smelting furnace lower state.
Fig. 2 is the structural representation that crucible of the present invention is in smelting furnace top state.
Fig. 3 is the structural representation that the present invention derives the control of control device electrode.
Fig. 4 is the structural representation of water conservancy diversion pipe furnace Outboard Sections taper adapter bonnet of the present invention.
Fig. 5 is the structural representation of water conservancy diversion pipe furnace Outboard Sections isocon of the present invention.
Embodiment
Hereafter successively opticglass melting method of the present invention and the optical glass smelting device being exclusively used in the method are described in detail.
One, melter designs
Smelting furnace comprises body of heater, heating member and crucible 4, and body of heater is provided with charging opening 2.Heating member comprises melting heating member 7 and Heat preservation body 13, and melting heating member 7 is positioned at lower portion of furnace body, and Heat preservation body 13 is positioned at upper of furnace body.Heating member about 7,13 points two groups layouts, grouping controls furnace temperature.Usual temperature of lower is higher than upper temp.Bottom of furnace body is liftable furnace bottom 1, and the thermal insulation layer of crucible bottom will have enough thickness, when carrying out the operation of lifting crucible, guarantees that the heating member of bottom in stove can not expose.Crucible is quartz or aluminum oxide corundum material crucible 4.Be provided with crucible sleeve cylinder 3 outside crucible 4, cast mullite corundum material selected by crucible sleeve 3.As shown in Figure 2, crucible 4 lifting process will steadily, at the uniform velocity, and in thrust-augmenting nozzle inlet end 6 embedded in glass liquid, and entrance is positioned at (1/5 ~ 1/4) H at the bottom of distance crucible, apart from sidewall of crucible (1/4 ~ 1/3) Φ place (note: the H crucible degree of depth, Φ crucible internal diameter).
Two, the design of control device is derived
(1) the derivation control device described in is actually the metal thrust-augmenting nozzle inside and outside a connection stove, is installed on smelting furnace top.Using platinum or platinum alloy and gold.This thrust-augmenting nozzle divides stove inboard portion and stove Outboard Sections.Stove inboard portion metal thrust-augmenting nozzle is isometrical, outer surface cover aerobic aluminium alundum tube 5.Inboard portion is connected by dome-shaped transition with stove Outboard Sections.The metal water conservancy diversion bore of stove Outboard Sections can change internal diameter size (as shown in Figure 4) by welding taper reducing communicating pipe, and glass metal little to high temperature viscosity is like this derived process and is easy to control.Also can be undertaken shunting (as shown in Figure 5) by welding isocon, the glass billot 12 of different size can be produced so simultaneously.The effective insulating cotton 10 of metal water conservancy diversion of Outboard Sections swathes and is incubated, and segmentation is welded with electrode slice 11, the corresponding voltate regulator of each group electrode slice, by the size regulating every segment electrode sheet to import electric current, control the temperature and the flow velocity that flow out glass metal, make every effort to the homo(io)thermism of glass metal, make the viscosity B coefficent of outflow glass metal very little, ensure to produce without striped in moulding process glass billot.
(2) above-mentioned bulk metal thrust-augmenting nozzle inner wall smooth is required, uniform wall thickness, preferably poor without thickness.The internal surface that everywhere transition connects wants level and smooth, corrugationless, without salient point, indefectible, guarantee that process formation eddy current and without the resistance determining factor in pipe derived by glass metal.
Three, glass melting mode
(1) high-purity quartz or corundum crucible 4 are in smelting furnace central lower high temperature melting tabetisol specified location.Described specified location is the requirement to crucible height, refers to along the height location a little less than charging opening 2 times along 2 ~ 10 centimetres on crucible 4, as shown in Figure 1.
(2) the raw material gradation of working good added in crucible carry out high temperature material, the glass metal of fusing again through high temperature clarification, high temperature homogenization process, obtained required melten glass liquid.
Four, glass melt derives mode
(1) crucible 4 and sleeve 3 that fill the good glass metal of melting are promoted to smelting furnace top keeping warm mode specified location, as shown in Figure 2.Described specified location makes to be placed in the metal water conservancy diversion tube inlet end 6 embedded in glass liquid on smelting furnace top.Require that at the bottom of mouth of pipe distance crucible, (1/5 ~ 1/4) H is high, apart from sidewall of crucible (1/4 ~ 1/3) φ place (note: H is high in crucible, and φ is crucible internal diameter).The glass metal of deriving from this position is best in quality, and optical homogeneity is good, and transmitance is high, the defect such as bubble-free, impurity.
(2) when deriving operation, stove Outboard Sections metal thrust-augmenting nozzle is energized, controls size of current and slowly heat up.Outboard tube exit connects vacuum suction pump and carries out vacuum pumping, lentamente glass metal is drawn by stove, then remove vacuum suction pump, thrust-augmenting nozzle electric current is regulated to make glass metal flow speed stability, the glass metal of outflow is injected the forming mould 9 settled in advance, through roll-in, the glass billot being drawn into the high-quality of required specification.
(3) when bulk bubble appears in diversion outlet glass metal, illustrate that the metal level in crucible has dropped near thrust-augmenting nozzle entrance.Now carry out falling crucible operation, crucible is down to initial high temperature melting tabetisol specified location, waits for next feeding operation.Then, kindling internal upper part temperature, rise thrust-augmenting nozzle electrode slice electric current glass metal remaining in conduit is all flowed out, thrust-augmenting nozzle is hollow state.Then fall top furnace temperature again to original state, fall thrust-augmenting nozzle electric current until power-off, waiting for next time derives glass metal operation.
Repetitive operation can the phosphoric acid salt of batch production high-quality, niobate and bismuthate optical glass strip material in a manner described, and inside glass is without the pollution of metal particle, and Glass optical consistence is good, transmitance is high, and refractive index n d is not less than 1.8.
The optical glass strip material adopting the present invention to produce can carry out second-heating die mould, makes the optical element of required specification.
Claims (3)
1. an opticglass melting method, for melting high-quality phosphoric acid salt, niobate and bismuthate opticglass, is characterized in that comprising following processing step:
1. first phosphoric acid salt, niobate and bismuthate Optical Glass Materials are put into the quartz being arranged in smelting furnace bottom melt region or aluminum oxide corundum material crucible carries out high-temperature fusion, clarification, all changes into glass metal, be provided with crucible sleeve cylinder (3) outside this quartz or aluminum oxide corundum material crucible, be placed on liftable furnace bottom (1);
2. then rising liftable furnace bottom (1), makes above-mentioned crucible be placed in the soak zones of smelting furnace top together with glass metal;
3. optical glass strip material is made finally by conduit by outside the glass metal of the region intermediate below crucible mesexine, more than bottom derivation smelting furnace, this conduit is the thrust-augmenting nozzle comprising platinum through upper of furnace body furnace wall or platinum alloy material, be positioned at the pipe overcoat that furnace interior divides and have aluminum oxide corundum material sleeve pipe (5), be positioned on the outer pipe outer wall partly of stove and be welded with at least one group of electrode slice (11), preferably 2 ~ 5 groups of electrode slices, and be enclosed with insulating cotton (10).
2. one kind is exclusively used in the optical glass smelting device of opticglass melting method according to claim 1, comprise the smelting furnace body of heater, heating member, crucible and the derivation control device that are provided with charging opening, it is characterized in that: described heating member comprises melting heating member (7) and Heat preservation body (13), melting heating member (7) is positioned at lower portion of furnace body, and Heat preservation body (13) is positioned at upper of furnace body; Bottom of furnace body is liftable furnace bottom (1); Crucible is quartz or aluminum oxide corundum material crucible (4), is provided with crucible sleeve cylinder (3) outward; Derive the thrust-augmenting nozzle that control device comprises platinum through upper of furnace body furnace wall or platinum alloy material, this thrust-augmenting nozzle is positioned at the pipe overcoat that furnace interior divides aluminum oxide corundum material sleeve pipe (5); Be positioned on the outer pipe outer wall partly of stove and be welded with 2 ~ 5 groups of electrode slices (11), and be enclosed with insulating cotton (10).
3. optical glass smelting device according to claim 2, is characterized in that: the inlet end (6) of described thrust-augmenting nozzle is positioned at 1/5 ~ 1/4 height at the bottom of the crucible under keeping warm mode, apart from sidewall of crucible 1/4 ~ 1/3 diameter (Φ) place.
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| CN201110185586.XA CN102849920B (en) | 2011-07-04 | 2011-07-04 | Optical glass melting method and optical glass melting device used for method |
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| CN201110185586.XA CN102849920B (en) | 2011-07-04 | 2011-07-04 | Optical glass melting method and optical glass melting device used for method |
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| CN102849920B true CN102849920B (en) | 2015-04-08 |
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| CN103113016B (en) * | 2013-01-31 | 2015-05-20 | 成都尤利特光电科技有限公司 | Quartz crucible for founding lanthanide series optical glass and method for founding lanthanide series optical glass slag clinker |
| CN103130401B (en) * | 2013-03-25 | 2015-03-25 | 湖北新华光信息材料有限公司 | Casting production device and method for non-oxide glass |
| CN105565656B (en) * | 2014-10-17 | 2023-01-03 | 株式会社小原 | Optical glass |
| CN106628836A (en) * | 2017-02-23 | 2017-05-10 | 重庆江东机械有限责任公司 | Insulated conveying system, insulated method thereof and application |
| CN109867433B (en) * | 2019-03-27 | 2021-12-14 | 中国建筑材料科学研究总院有限公司 | Efficient screening system and method for glass components |
| CN114436512B (en) * | 2022-02-10 | 2023-06-23 | 成都光明光电有限责任公司 | Glass block forming device and forming method thereof |
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