CN117185625A - Lens preparation method based on Joule heat ultra-fast high-temperature sintering process - Google Patents
Lens preparation method based on Joule heat ultra-fast high-temperature sintering process Download PDFInfo
- Publication number
- CN117185625A CN117185625A CN202311002065.5A CN202311002065A CN117185625A CN 117185625 A CN117185625 A CN 117185625A CN 202311002065 A CN202311002065 A CN 202311002065A CN 117185625 A CN117185625 A CN 117185625A
- Authority
- CN
- China
- Prior art keywords
- lens
- carbon
- sintering
- heating body
- ultra
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000005245 sintering Methods 0.000 title claims abstract description 97
- 238000000034 method Methods 0.000 title claims abstract description 58
- 238000002360 preparation method Methods 0.000 title claims abstract description 17
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 68
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 68
- 238000010438 heat treatment Methods 0.000 claims abstract description 62
- 238000003825 pressing Methods 0.000 claims abstract description 37
- 239000000843 powder Substances 0.000 claims abstract description 23
- 238000004519 manufacturing process Methods 0.000 claims abstract description 19
- 239000002994 raw material Substances 0.000 claims abstract description 19
- 230000008878 coupling Effects 0.000 claims abstract description 13
- 238000010168 coupling process Methods 0.000 claims abstract description 13
- 238000005859 coupling reaction Methods 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 9
- 230000001276 controlling effect Effects 0.000 claims abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 24
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 18
- 239000000377 silicon dioxide Substances 0.000 claims description 10
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 9
- 229910052786 argon Inorganic materials 0.000 claims description 9
- 229910052802 copper Inorganic materials 0.000 claims description 9
- 239000010949 copper Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 8
- 241000270722 Crocodylidae Species 0.000 claims description 7
- LNNWVNGFPYWNQE-GMIGKAJZSA-N desomorphine Chemical compound C1C2=CC=C(O)C3=C2[C@]24CCN(C)[C@H]1[C@@H]2CCC[C@@H]4O3 LNNWVNGFPYWNQE-GMIGKAJZSA-N 0.000 claims description 7
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 6
- 238000000227 grinding Methods 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- 229910001220 stainless steel Inorganic materials 0.000 claims description 6
- 239000010935 stainless steel Substances 0.000 claims description 6
- PFNQVRZLDWYSCW-UHFFFAOYSA-N (fluoren-9-ylideneamino) n-naphthalen-1-ylcarbamate Chemical compound C12=CC=CC=C2C2=CC=CC=C2C1=NOC(=O)NC1=CC=CC2=CC=CC=C12 PFNQVRZLDWYSCW-UHFFFAOYSA-N 0.000 claims description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 claims description 3
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 239000004744 fabric Substances 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- 239000001307 helium Substances 0.000 claims description 3
- 229910052734 helium Inorganic materials 0.000 claims description 3
- SWQJXJOGLNCZEY-UHFFFAOYSA-N helium atom Chemical compound [He] SWQJXJOGLNCZEY-UHFFFAOYSA-N 0.000 claims description 3
- ORUIBWPALBXDOA-UHFFFAOYSA-L magnesium fluoride Chemical compound [F-].[F-].[Mg+2] ORUIBWPALBXDOA-UHFFFAOYSA-L 0.000 claims description 3
- 229910001635 magnesium fluoride Inorganic materials 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- 239000011347 resin Substances 0.000 claims description 3
- 229920005989 resin Polymers 0.000 claims description 3
- 229910052710 silicon Inorganic materials 0.000 claims description 3
- 239000010703 silicon Substances 0.000 claims description 3
- 238000001931 thermography Methods 0.000 claims description 3
- 241000270728 Alligator Species 0.000 description 7
- GFHNAMRJFCEERV-UHFFFAOYSA-L cobalt chloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].[Cl-].[Co+2] GFHNAMRJFCEERV-UHFFFAOYSA-L 0.000 description 5
- 238000009529 body temperature measurement Methods 0.000 description 4
- ORTQZVOHEJQUHG-UHFFFAOYSA-L copper(II) chloride Chemical compound Cl[Cu]Cl ORTQZVOHEJQUHG-UHFFFAOYSA-L 0.000 description 4
- 239000011521 glass Substances 0.000 description 4
- 229910021591 Copper(I) chloride Inorganic materials 0.000 description 3
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- NQXWGWZJXJUMQB-UHFFFAOYSA-K iron trichloride hexahydrate Chemical compound O.O.O.O.O.O.[Cl-].Cl[Fe+]Cl NQXWGWZJXJUMQB-UHFFFAOYSA-K 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
- 238000012805 post-processing Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- 238000002490 spark plasma sintering Methods 0.000 description 3
- 229910021592 Copper(II) chloride Inorganic materials 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000000149 argon plasma sintering Methods 0.000 description 2
- 238000009694 cold isostatic pressing Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 239000000047 product Substances 0.000 description 2
- 238000001778 solid-state sintering Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 238000007654 immersion Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000012266 salt solution Substances 0.000 description 1
- 230000035939 shock Effects 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P40/00—Technologies relating to the processing of minerals
- Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
- Y02P40/57—Improving the yield, e-g- reduction of reject rates
Abstract
The invention discloses a lens preparation method based on a Joule heat ultra-fast high-temperature sintering process, which comprises the following steps: step S1, placing raw material powder into a pressing die for pressing to obtain a compact structure of a lens shape; s2, placing the compact structure pressed in the step S1 in a carbon heating body in an inert atmosphere, heating the carbon heating body by adopting coupling current to sinter the compact structure, regulating and controlling output parameters of the coupling current to control sintering temperature, and collecting a solidified semi-finished lens after sintering is finished; and step S3, carrying out surface post-treatment on the cured and molded semi-finished lens obtained by sintering in the step S2, and finally obtaining the finished lens. The lens manufactured by the method can greatly improve the manufacturing efficiency, save the manufacturing cost and obtain the lens with excellent performance.
Description
Technical Field
The invention relates to the technical field of lens preparation, in particular to a lens preparation method based on a Joule heat ultra-fast high-temperature sintering process.
Background
Under the rapid development of manufacturing technology, various methods for manufacturing free-form lenses have appeared in industry, including conventional solid state sintering, spark plasma sintering, flash sintering, laser sintering, and other sintering methods. Conventional solid state sintering can reduce processing temperatures, but requires several hours of heat treatment to obtain dense silica glass. Spark Plasma Sintering (SPS) can obtain dense glass in a short sintering time (2-10 minutes) and a low temperature range (1073-1883K); spark plasma sintering, however, requires equipment that provides both mechanical pressure (6-100 MPa) and high pulse dc, which can be expensive for many commercial products. Flash sintering is another rapid sintering technique that requires high electric fields (up to 3000V/cm) due to the high resistivity of the glass powder compacts; furthermore, although densification of the glass powder occurs within a few seconds during the flash sintering process, the glass powder generally requires a long preheating in a conventional furnace, which greatly increases the overall processing time. Laser sintering can rapidly heat the silica precursor; however, the sintering rate is affected by the output power, the scanning speed (1 mm/s) and the spot size (diameter. Apprxeq.1 mm), the sintered porous structure results in low transparency.
However, the current manufacturing methods all have respective drawbacks. In particular, to solve the problems of troublesome pretreatment and long sintering time, aiming at the problems, a new preparation method of a free-form surface lens is urgently needed to be developed, and the characteristics of low cost and high preparation speed are satisfied.
Disclosure of Invention
The present invention aims to solve, at least to some extent, one of the above technical problems in the prior art. Therefore, the embodiment of the invention provides a lens preparation method based on a Joule heat ultra-fast high-temperature sintering process, which can solve the problems of troublesome pretreatment and long sintering time, greatly improve the manufacturing efficiency, save the manufacturing cost and obtain a free-form surface lens with excellent performance.
The preparation method of the lens based on the Joule-heating ultra-fast high-temperature sintering process comprises the following steps:
step S1, placing raw material powder into a pressing die for pressing to obtain a compact structure of a lens shape;
s2, placing the compact structure pressed in the step S1 in a carbon heating body in an inert atmosphere, heating the carbon heating body by adopting coupling current to sinter the compact structure, regulating and controlling output parameters of the coupling current to control sintering temperature, and collecting a solidified semi-finished lens after sintering is finished;
and step S3, carrying out surface post-treatment on the cured and molded semi-finished lens obtained by sintering in the step S2, and finally obtaining the finished lens.
In an optional or preferred embodiment, step S2 is implemented by using a joule heat ultra-fast high temperature sintering device, where the joule heat ultra-fast high temperature sintering device includes a current output module outputting a coupling current, a carbon heater module electrically connected with the current output module and implementing electrothermal conversion, and a temperature control module performing output parameter regulation on the current output module, where the carbon heater module includes a carbon heating body and a conductive connecting piece, and two ends of the carbon heating body are electrically connected with the current output module through the conductive connecting piece, so that joule heat is rapidly generated by using resistance of the carbon heating body, and sintering is performed on a compact structure placed on the carbon heating body.
In an alternative or preferred embodiment, the carbon heating body is one of a carbon strip, a carbon cloth, a carbon paper, a carbon plate and a carbon column.
In an alternative or preferred embodiment, the conductive connection piece includes a conductive copper sheet and an alligator clip power cord, the alligator clip power cord is electrically connected with the current output module, two ends of the carbon heating body are respectively connected with the conductive copper sheet and the alligator clip power cord, and the conductive copper sheet and the alligator clip power cord are fixedly connected on a ceramic bottom plate.
In an alternative or preferred embodiment, the power supply of the current output module ranges from 2000W to 8000W, and the current range ranges from 50A to 80A; in step S2, the current output module controls the current applied to the carbon heater module to be 10-30A, the sintering time to be 10-25S, and the sintering temperature to be 1500-1700K.
In an optional or preferred embodiment, the temperature control module is a non-contact temperature measurement device, including one or more of an infrared temperature measurement device, a laser temperature measurement device, and a thermal imaging temperature measurement device.
In an alternative or preferred embodiment, in step S2, the inert atmosphere is created using one or more of argon, nitrogen, and helium, and the carbon heating body is located in the inert atmosphere.
In an alternative or preferred embodiment, in step S1, the raw material powder is one or more of calcium fluoride, magnesium fluoride, silicon, germanium, silicon dioxide, and zinc selenide.
In an alternative or preferred embodiment, the pressing die is made of stainless steel materials or resin materials, the pressing pressure of the pressing die is 40MPa-100MPa, and the pressing time is 30s-5min; and finally, preparing a finished lens which is one of a flat mirror, a single-sided convex/concave lens and a double-sided convex/concave lens.
In an alternative or preferred embodiment, in step S3, the technique of surface finishing employs one or more of grinding, cutting, lapping.
Based on the technical scheme, the embodiment of the invention has at least the following beneficial effects: according to the technical scheme, raw material powder is pressed in the pressing die with the specific curved surface, so that a compact structure with the specific curved surface shape is obtained, the compact structure is sintered in the carbon heating body under the inert atmosphere, the output parameters of coupling current are regulated and controlled, the semi-finished lens formed by solidification is obtained through sintering, and finally, the finished lens is obtained through surface post-treatment. The lens is prepared by adopting the Joule heat ultra-fast high-temperature sintering process, and the process can instantaneously generate a large amount of Joule heat to rapidly sinter the raw material structure, so that the sintering can be completed within about 10 seconds, the sintering rate of the lens can be improved, and the sintering time can be reduced; the method can realize direct sintering and forming of the pressed compact structure, and sintering can be realized by only electrifying the carbon heating body in inert atmosphere, so that high cost in the prior art is greatly saved. Compared with the common industrial process, the invention saves the complex setting process and high manufacturing cost, has simple process flow, and the prepared product has excellent performance, thereby opening up a new way for rapidly preparing the free-form lens.
Drawings
The invention is further described below with reference to the drawings and examples;
fig. 1 is a cross-sectional view of a press mold for manufacturing a single-sided convex lens according to an embodiment of the present invention;
FIG. 2 is a cross-sectional view of a press mold for manufacturing a planar lens according to an embodiment of the present invention;
fig. 3 is a cross-sectional view of a pressing mold for manufacturing a single-sided concave lens according to an embodiment of the present invention;
FIG. 4 is a flow chart of a manufacturing process of an embodiment of the present invention;
FIG. 5 is a schematic process flow diagram of step S1 in an embodiment of the invention;
FIG. 6 is a schematic process flow diagram of step S2 in an embodiment of the invention;
fig. 7 is a schematic process flow diagram of step S3 in the embodiment of the invention.
Detailed Description
Reference will now be made in detail to the present embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the accompanying drawings are used to supplement the description of the written description so that one can intuitively and intuitively understand each technical feature and overall technical scheme of the present invention, but not to limit the scope of the present invention.
In the description of the present invention, it should be understood that references to orientation descriptions such as upper, lower, front, rear, left, right, etc. are based on the orientation or positional relationship shown in the drawings, are merely for convenience of description of the present invention and to simplify the description, and do not indicate or imply that the apparatus or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the present invention.
In the description of the present invention, a number means one or more, a number means two or more, and greater than, less than, exceeding, etc. are understood to not include the present number, and above, below, within, etc. are understood to include the present number. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present invention, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present invention can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
A lens manufacturing method based on the joule heating ultra-fast high temperature sintering process is described below with reference to fig. 1 to 7.
Referring to fig. 6, a joule heating ultra-fast high temperature sintering apparatus is described below, which can be applied to the above-described lens manufacturing method based on the joule heating ultra-fast high temperature sintering process. Specifically, the joule heating ultra-fast high temperature sintering device includes a current output module 32 for outputting a coupling current, a carbon heater module 31 electrically connected to the current output module 32 and realizing electrothermal conversion, and a temperature control module 33 for controlling output parameters of the current output module 32. The carbon heater module 31 includes a carbon heating body 311 and a conductive connecting piece 312, two ends of the carbon heating body 311 are electrically connected with the current output module 32 through the conductive connecting piece 312, the carbon heating body 311 utilizes its own resistor to rapidly generate joule heat, and can thermally shock a sintered object.
The preparation method of the lens based on the Joule heat ultra-fast high-temperature sintering process is characterized by comprising the following steps of:
in step S1, referring to fig. 5, the raw material powder 11 is put into a pressing die 21 to be pressed, resulting in a compact structure 12 in a lens shape.
Specifically, the raw material powder adopts one or more of calcium fluoride, magnesium fluoride, silicon, germanium, silicon dioxide and zinc selenide. In the application, the raw material powder is preferably silicon dioxide, and the silicon dioxide is preferably silicon dioxide with the purity of more than 99 percent and the particle size of 10nm-40nm.
In some embodiments, the pressing mold 21 is made of stainless steel material or resin material, the pressing pressure of the pressing mold 21 is 40MPa-100MPa, and the pressing time is 30s-5min; wherein, by changing the shape of the mold cavity of the pressing mold 21 to press the compact structure corresponding to the shape of the lens, the finished lens is finally manufactured, and the finished lens is one of a flat mirror, a single-sided convex/concave lens and a double-sided convex/concave lens.
Step S2, referring to FIG. 6, in an inert atmosphere, the compact structure 12 pressed in the step S1 is placed in a carbon heating body 311, the carbon heating body 311 is heated by coupling current to sinter the compact structure 12, output parameters of the coupling current are regulated and controlled to control sintering temperature, and after sintering is finished, the solidified and molded semi-finished lens 13 is collected.
The step is realized by using a joule heat ultra-fast high-temperature sintering device, and the joule heat is rapidly generated by using the self resistance of the carbon heating body 311, so as to sinter the compact structure 12 placed on the carbon heating body 311.
Specifically, in the carbon heater module, the carbon heating body 311 is one of a carbon strip, a carbon cloth, a carbon paper, a carbon plate and a carbon column; the conductive connecting piece 312 includes a conductive copper sheet and a crocodile clip power cord electrically connected to the current output module 32, and two ends of the carbon heating body 311 are respectively connected to the conductive copper sheet and the crocodile clip power cord, and are fixedly connected to a ceramic base plate by the conductive copper sheet and the crocodile clip power cord.
In the current output module, the power range of the current output module 32 is 2000-8000W, and the current range is 50-80A; in step S2, the current output module 32 controls the current applied to the carbon heater module 31 to be 10-30A, the sintering time to be 10-25S, and the sintering temperature to be 1500-1700K.
The temperature control module 33 is a non-contact temperature measuring device, and comprises one or more of an infrared temperature measuring device, a laser temperature measuring device and a thermal imaging temperature measuring device. The temperature control module regulates and controls the output parameters of the current output module by detecting the sintering temperature of the compact structure, and various temperature measuring devices of the temperature control module are all in the prior art, and the specific power connection mode with the current output module is not repeated.
In addition, the inert atmosphere is created by one or more of argon, nitrogen and helium, and the carbon heating body 311 is located in the inert atmosphere.
Step S3, referring to fig. 7, the cured and molded semi-finished lens 13 obtained by sintering in step S2 is subjected to surface post-treatment, and finally the finished lens 14 is obtained. The surface post-treatment technology adopts one or more of grinding, cutting and lapping.
It can be understood that the existing preparation method of the free-form lens has low sintering rate, high cost and complex process in the sintering process. The invention is characterized in that raw material powder is pressed in a pressing die with a specific curved surface, so that a compact structure with a specific curved surface shape is obtained, the compact structure is sintered in a carbon heating body under inert atmosphere, the output parameters of coupling current are regulated and controlled, the semi-finished lens formed by solidification is obtained by sintering, and finally, the finished lens is obtained by surface post-treatment.
The lens is prepared by adopting the Joule heat ultra-fast high-temperature sintering process, and the process can instantaneously generate a large amount of Joule heat to rapidly sinter the raw material structure, so that the sintering can be completed within about 10 seconds, the sintering rate of the lens can be improved, and the sintering time is shortened. The method can realize direct sintering and forming of the pressed compact structure, and sintering can be realized by only electrifying the carbon heating body in inert atmosphere, so that high cost in the prior art is greatly saved. The lens manufactured by the method can greatly improve the manufacturing efficiency, save the manufacturing cost and obtain the lens with excellent performance.
Three examples are shown below to further illustrate the application of the lens preparation method based on the joule heating ultra-fast high temperature sintering process.
Example 1
A preparation method of a convex lens based on a Joule heat ultra-fast high-temperature sintering process comprises the following steps:
step S1, preparing a compact structure: the method comprises the steps of selecting silicon dioxide powder with the grain size of about 11nm from Sigma-Aldrich company as raw material powder for pressing, using a stainless steel pressing die for pressing the silicon dioxide powder, adopting a semi-ellipsoidal surface with a long half shaft of 11mm and a short half shaft of 4mm as a die cavity shape of the pressing die, and then carrying out cold isostatic pressing on the raw material powder for 40s under the pressure of 40MPa to obtain a compact structure with a convex lens shape. The pressing die 21 of the present embodiment can be shown with reference to fig. 1.
Step S2, preparing a convex lens: setting up a Joule heat high-temperature rapid sintering device, and adopting argon as a protective gas, wherein the Joule heat high-temperature rapid sintering device comprises a glove box, and setting up an inert atmosphere by taking the glove box as an external structure for providing an argon environment; the carbon heating body is located in an inert atmosphere, wherein an alligator clip power cord connected with the current output module passes through the glove box and is connected to the carbon heating body. The power supply of the current output module adopts 4000W power and a direct current power supply with adjustable current. The temperature control module adopts an infrared temperature measuring device and is well arranged, then the compact structure of the convex lens shape obtained in the step S1 is placed in a carbon heating body, meanwhile, the temperature control module and the current output module are started to realize sintering temperature control, the output parameters of the current output module are regulated and controlled, the current is adjusted to 20A, and after sintering is finished, the semi-finished lens of the convex lens shape is collected. The sintering time is 20s and the sintering temperature is 1700K in the whole process.
Step S3, post-processing: and (3) grinding and polishing the semi-finished lens obtained in the step (S2) to finally obtain a finished lens with a smooth surface, namely a convex lens.
Example two
A preparation method of a plane mirror based on a Joule heat ultra-fast high-temperature sintering process comprises the following steps:
step S1, preparing a compact structure: a silica powder having a particle diameter of about 11nm was selected from Sigma-Aldrich company as a raw material powder, and the silica powder was press-molded using a press die made of a stainless steel having a diameter of 22mm, and the raw material powder was cold isostatic pressed under a pressure of 40MPa for 40s to obtain a compact structure in the shape of a flat mirror. The pressing die 21 of the present embodiment can be shown with reference to fig. 2.
Step S2, preparing a plane mirror: setting up a Joule heat high-temperature rapid sintering device, and adopting argon as a protective gas, wherein the Joule heat high-temperature rapid sintering device comprises a glove box, and setting up an inert atmosphere by taking the glove box as an external structure for providing an argon environment; the carbon heating body is located in an inert atmosphere, wherein an alligator clip power cord connected with the current output module passes through the glove box and is connected to the carbon heating body. The power supply of the current output module adopts 4000W power and a direct current power supply with adjustable current. The temperature control module adopts an infrared temperature measuring device and is well arranged, then the compact structure of the plane mirror shape obtained in the step S1 is placed in a carbon heating body, meanwhile, the temperature control module and the current output module are started to realize sintering temperature control, the output parameters of the current output module are regulated and controlled, the current is adjusted to 20A, and after sintering is finished, the semi-finished lens of the plane mirror shape is collected. The sintering time is 20s and the sintering temperature is 1700K in the whole process.
Step S3, post-processing: and (3) grinding and polishing the semi-finished lens obtained in the step (S2) to finally obtain a finished lens with a smooth surface, namely a plane mirror.
Example III
A preparation method of a lens based on a Joule heat ultra-fast high-temperature sintering process comprises the following steps:
step S1, preparing a compact structure: a powder of silica having a particle diameter of about 11nm from Sigma-Aldrich was selected as a raw material powder for pressing, wherein cobalt (II) chloride hexahydrate (CoCl 2 ·6H 2 O), iron (III) chloride hexahydrate (FeCl) 3 ·6H 2 O), copper (II) chloride (CuCl) 2 ) As a doping material for the raw material powder.
Using a stainless steel pressing die to press and shape silicon dioxide powder, wherein the shape of a die cavity of the pressing die adopts a semi-ellipsoidal surface with a long half shaft of 11mm and a short half shaft of 4mm, and then carrying out cold isostatic pressing on raw material powder for 40s under the pressure of 40MPa to obtain a compact structure with a convex lens shape; then 0.2wt% of CoCl 2 ·6H 2 O, 0.3wt% FeCl 3 ·6H 2 O and 0.15 wt% CuCl 2 Respectively dissolving in ethanol; the compacted structure in the shape of the pressed convex lens was incorporated into these metal salt solutions by one immersion and dried in air for 10 minutes. The pressing die 21 of the present embodiment can be shown with reference to fig. 1.
Step S2, preparing a colored convex lens: setting up a Joule heat high-temperature rapid sintering device, and adopting argon as a protective gas, wherein the Joule heat high-temperature rapid sintering device comprises a glove box, and setting up an inert atmosphere by taking the glove box as an external structure for providing an argon environment; the carbon heating body is located in an inert atmosphere, wherein an alligator clip power cord connected with the current output module passes through the glove box and is connected to the carbon heating body. The power supply of the current output module adopts 4000W power and a direct current power supply with adjustable current. The temperature control module adopts an infrared temperature measuring device and is well arranged, then the compact structure of the convex lens shape obtained in the step S1 is placed in a carbon heating body, meanwhile, the temperature control module and the current output module are started to realize sintering temperature control, the output parameters of the current output module are regulated and controlled, the current is adjusted to 20A, and after sintering is finished, the semi-finished lens with the convex lens shape being colored is collected. Wherein cobalt (II) chloride hexahydrate (CoCl) is doped 2 ·6H 2 O), iron (III) chloride hexahydrate (FeCl) 3 ·6H 2 O), copper (II) chloride (CuCl) 2 ) The structure of the lens can respectively obtain blue, yellow and red convex lenses, the sintering time is 20s in the whole process, and the sintering temperature is 1700K.
Step S3, post-processing: and (3) grinding and polishing the semi-finished lens obtained in the step (S2) to finally obtain a finished lens with a smooth surface, namely the colored convex lens.
In the above-described first and second embodiments, the person skilled in the art can refer to the preparation of the single-sided convex lens or the double-sided convex lens; similarly, the cavity shape of the pressing mold may be changed to prepare a single-sided concave lens or a double-sided concave lens, for example, the pressing mold shown in fig. 3 may prepare a single-sided concave lens.
The embodiments described above can be applied to the field of free-form lens manufacturing, and will significantly increase the sintering rate and reduce the sintering cost, by using the joule-heated ultra-fast high temperature sintering process, the sintering rate can be increased, and lenses of different curves can be obtained using different pressing molds. Further, a colored lens can be obtained by further doping a material such as iron (III) chloride hexahydrate.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention.
Claims (10)
1. The preparation method of the lens based on the Joule heat ultra-fast high-temperature sintering process is characterized by comprising the following steps of:
step S1, placing raw material powder into a pressing die for pressing to obtain a compact structure of a lens shape;
s2, placing the compact structure pressed in the step S1 in a carbon heating body in an inert atmosphere, heating the carbon heating body by adopting coupling current to sinter the compact structure, regulating and controlling output parameters of the coupling current to control sintering temperature, and collecting a solidified semi-finished lens after sintering is finished;
and step S3, carrying out surface post-treatment on the cured and molded semi-finished lens obtained by sintering in the step S2, and finally obtaining the finished lens.
2. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 1, wherein: step S2 is realized by utilizing a Joule heat ultrafast high-temperature sintering device, wherein the Joule heat ultrafast high-temperature sintering device comprises a current output module for outputting coupling current, a carbon heater module electrically connected with the current output module and realizing electrothermal conversion, and a temperature control module for controlling output parameters of the current output module, the carbon heater module comprises a carbon heating body and conductive connecting pieces, two ends of the carbon heating body are electrically connected with the current output module through the conductive connecting pieces, so that Joule heat is rapidly generated by utilizing the self resistance of the carbon heating body, and a compact structure of the carbon heating body is sintered.
3. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 2, wherein: the carbon heating body is one of a carbon strip, a carbon cloth, a carbon paper, a carbon plate and a carbon column.
4. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 2, wherein: the conductive connecting piece comprises a conductive copper sheet and a crocodile clip power line, the crocodile clip power line is electrically connected with the current output module, two ends of the carbon heating body are respectively connected with the conductive copper sheet and the crocodile clip power line, and the conductive copper sheet and the crocodile clip power line are fixedly connected to a ceramic bottom plate.
5. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 2, wherein: the power range of the current output module is 2000-8000W, and the current range is 50-80A; in step S2, the current output module controls the current applied to the carbon heater module to be 10-30A, the sintering time to be 10-25S, and the sintering temperature to be 1500-1700K.
6. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 2, wherein: the temperature control module is a non-contact temperature measuring device and comprises one or more of an infrared temperature measuring device, a laser temperature measuring device and a thermal imaging temperature measuring device.
7. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 1, wherein: in the step S2, the inert atmosphere is constructed by adopting one or more of argon, nitrogen and helium, and the carbon heating body is positioned in the inert atmosphere.
8. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 1, wherein: in the step S1, the raw material powder adopts one or more of calcium fluoride, magnesium fluoride, silicon, germanium, silicon dioxide and zinc selenide.
9. The method for preparing a lens based on a joule heating ultra-fast high temperature sintering process according to claim 1, wherein: the pressing die is made of stainless steel materials or resin materials, the pressing pressure of the pressing die is 40MPa-100MPa, and the pressing time is 30s-5min; and finally, preparing a finished lens which is one of a plane lens, a single-sided convex/concave lens and a double-sided convex/concave lens by changing the shape of a die cavity of the pressing die to press a compact structure corresponding to the shape of the lens.
10. The method for manufacturing a lens based on a joule heating ultra-fast high temperature sintering process according to any one of claims 1 to 9, wherein: in step S3, the surface post-treatment technique adopts one or more of grinding, cutting and lapping.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311002065.5A CN117185625A (en) | 2023-08-09 | 2023-08-09 | Lens preparation method based on Joule heat ultra-fast high-temperature sintering process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311002065.5A CN117185625A (en) | 2023-08-09 | 2023-08-09 | Lens preparation method based on Joule heat ultra-fast high-temperature sintering process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117185625A true CN117185625A (en) | 2023-12-08 |
Family
ID=88996943
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311002065.5A Pending CN117185625A (en) | 2023-08-09 | 2023-08-09 | Lens preparation method based on Joule heat ultra-fast high-temperature sintering process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117185625A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249665A (en) * | 2007-01-09 | 2008-08-27 | 史考特公司 | Method for the production of optical elements and optical elements |
| CN113831144A (en) * | 2021-10-26 | 2021-12-24 | 中国工程物理研究院材料研究所 | Method for preparing ceramic material by multi-field coupling ultra-fast sintering |
| CN114206802A (en) * | 2019-05-17 | 2022-03-18 | 马里兰大学派克分院 | High temperature sintering system and method |
| CN216954849U (en) * | 2021-10-25 | 2022-07-12 | 深圳中科精研科技有限公司 | Experimental preparation equipment for joule heat high-temperature ultrafast material |
-
2023
- 2023-08-09 CN CN202311002065.5A patent/CN117185625A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101249665A (en) * | 2007-01-09 | 2008-08-27 | 史考特公司 | Method for the production of optical elements and optical elements |
| CN114206802A (en) * | 2019-05-17 | 2022-03-18 | 马里兰大学派克分院 | High temperature sintering system and method |
| CN216954849U (en) * | 2021-10-25 | 2022-07-12 | 深圳中科精研科技有限公司 | Experimental preparation equipment for joule heat high-temperature ultrafast material |
| CN113831144A (en) * | 2021-10-26 | 2021-12-24 | 中国工程物理研究院材料研究所 | Method for preparing ceramic material by multi-field coupling ultra-fast sintering |
Non-Patent Citations (1)
| Title |
|---|
| CHENGWEI WANG等: "A general method to synthesize and sinter bulk ceramics in seconds", SCIENCE, vol. 368, no. 6490, 1 May 2020 (2020-05-01), pages 521 - 526, XP055879576, DOI: 10.1126/science.aaz7681 * |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110845237B (en) | High-entropy ceramic powder, preparation method thereof and high-entropy ceramic block | |
| JP5023093B2 (en) | High frequency induction heating apparatus for ceramic material and non-pressure sintering method using the same | |
| CN108439986A (en) | (HfTaZrTiNb) preparation method of C high entropys ceramic powder and high entropy ceramic powder and high entropy ceramic block | |
| CN110577399B (en) | Multi-field coupling flash sintering system based on induction heating | |
| CN102260802B (en) | Target preparation device and target processing method thereof | |
| CN101468370A (en) | Amorphous alloy thermoforming apparatus and technique | |
| CN103700759B (en) | A kind of nano composite structure Mg 2si base thermoelectricity material and preparation method thereof | |
| CN105601277A (en) | Preparation method of yttrium oxide-based transparent ceramic | |
| CN112876232B (en) | High-temperature NTC thermal sensitive ceramic material and discharge plasma sintering method thereof | |
| CN106495677A (en) | A kind of high-strength thermal-shock power nickel-zinc ferrite and preparation method thereof | |
| CN206330417U (en) | A kind of ceramic material densification sintering stove of unidirectional oscillation pressure | |
| CN103725951B (en) | A kind of microwave sintering prepares the method for nano crystal soft magnetic material | |
| CN102796912A (en) | Preparation method of Al2O3 dispersion strengthened copper alloy bar | |
| CN205537095U (en) | Microwave heating fritting furnace based on pressurization | |
| CN103447530A (en) | Method for preparing pure titanium miniature parts on basis of multi-physical-field activated sintering | |
| CN117185625A (en) | Lens preparation method based on Joule heat ultra-fast high-temperature sintering process | |
| CN106518052A (en) | Method for preparing fine-grained barium titanate temperature-sensitive ceramic and product thereof | |
| CN102814499B (en) | Method for quickly preparing precious metal parts at low temperature | |
| CN103864436A (en) | Aluminum oxide miniature part prepared by active sintering based on multiple physical fields and sintering method of miniature part | |
| CN106191522A (en) | A kind of laser efficiently prepares the method for skutterudite thermoelectric material | |
| Mikami et al. | Near-net-shape fabrication of thermoelectric legs by flash sintering | |
| CN104711444B (en) | A kind of method of quick preparation high-performance SiGe high temperature thermoelectric alloy materials | |
| CN104404347B (en) | Method for preparing gradient magnetostriction material in situ | |
| JP2007324500A (en) | Fesi2 system thermoelectric conversion material and its manufacturing method | |
| CN102300347B (en) | Silicon nitride composite heat-generation body and manufacturing method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |