CN112577637B - Portable aluminum-copper fixed point black-body furnace and application thereof - Google Patents
Portable aluminum-copper fixed point black-body furnace and application thereof Download PDFInfo
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- CN112577637B CN112577637B CN202011486074.2A CN202011486074A CN112577637B CN 112577637 B CN112577637 B CN 112577637B CN 202011486074 A CN202011486074 A CN 202011486074A CN 112577637 B CN112577637 B CN 112577637B
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- WPPDFTBPZNZZRP-UHFFFAOYSA-N aluminum copper Chemical compound [Al].[Cu] WPPDFTBPZNZZRP-UHFFFAOYSA-N 0.000 title claims abstract description 53
- 230000005855 radiation Effects 0.000 claims abstract description 24
- 238000002844 melting Methods 0.000 claims abstract description 20
- 230000008018 melting Effects 0.000 claims abstract description 20
- 238000007711 solidification Methods 0.000 claims abstract description 14
- 230000008023 solidification Effects 0.000 claims abstract description 14
- 230000005496 eutectics Effects 0.000 claims abstract description 11
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052802 copper Inorganic materials 0.000 claims abstract description 10
- 239000010949 copper Substances 0.000 claims abstract description 10
- 238000010438 heat treatment Methods 0.000 claims description 39
- 238000002791 soaking Methods 0.000 claims description 22
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000000034 method Methods 0.000 claims description 10
- 238000005192 partition Methods 0.000 claims description 7
- 239000007769 metal material Substances 0.000 claims description 5
- 230000008569 process Effects 0.000 claims description 5
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical group [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 239000006023 eutectic alloy Substances 0.000 claims description 3
- 230000006641 stabilisation Effects 0.000 claims description 3
- 238000011105 stabilization Methods 0.000 claims description 3
- 230000000007 visual effect Effects 0.000 claims description 3
- 238000009833 condensation Methods 0.000 claims description 2
- 230000005494 condensation Effects 0.000 claims description 2
- 238000009413 insulation Methods 0.000 claims 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 9
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 9
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 abstract description 4
- 229910052725 zinc Inorganic materials 0.000 abstract description 4
- 239000011701 zinc Substances 0.000 abstract description 4
- 238000009529 body temperature measurement Methods 0.000 abstract description 3
- 238000005269 aluminizing Methods 0.000 abstract description 2
- 239000007789 gas Substances 0.000 description 9
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 229910018182 Al—Cu Inorganic materials 0.000 description 3
- 230000005457 Black-body radiation Effects 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 229910002804 graphite Inorganic materials 0.000 description 3
- 239000010439 graphite Substances 0.000 description 3
- 238000004321 preservation Methods 0.000 description 3
- 230000001681 protective effect Effects 0.000 description 3
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 2
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000004891 communication Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000010309 melting process Methods 0.000 description 2
- 230000003647 oxidation Effects 0.000 description 2
- 238000007254 oxidation reaction Methods 0.000 description 2
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 2
- 229910052718 tin Inorganic materials 0.000 description 2
- 229910018487 Ni—Cr Inorganic materials 0.000 description 1
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- VNNRSPGTAMTISX-UHFFFAOYSA-N chromium nickel Chemical compound [Cr].[Ni] VNNRSPGTAMTISX-UHFFFAOYSA-N 0.000 description 1
- 230000015271 coagulation Effects 0.000 description 1
- 238000005345 coagulation Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- 230000009191 jumping Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000155 melt Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052697 platinum Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- 238000013097 stability assessment Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000009755 vacuum infusion Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01K—MEASURING TEMPERATURE; MEASURING QUANTITY OF HEAT; THERMALLY-SENSITIVE ELEMENTS NOT OTHERWISE PROVIDED FOR
- G01K15/00—Testing or calibrating of thermometers
- G01K15/002—Calibrated temperature sources, temperature standards therefor
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/52—Radiation pyrometry, e.g. infrared or optical thermometry using comparison with reference sources, e.g. disappearing-filament pyrometer
- G01J5/53—Reference sources, e.g. standard lamps; Black bodies
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J5/00—Radiation pyrometry, e.g. infrared or optical thermometry
- G01J5/80—Calibration
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Radiation Pyrometers (AREA)
Abstract
The invention discloses a portable aluminum-copper fixed point black body furnace, which comprises a portable fixed point furnace and an aluminum-copper fixed point crucible, and realizes melting and solidification of an aluminum-copper eutectic fixed point (548.2 ℃), adopts a PLC three-section temperature control mode and combines the high heat conduction characteristic of a red copper aluminizing heat-equalizing block, can improve the uniformity of a temperature field, prolong the duration time of a temperature plateau and improve the recurrence level; although the determined aluminum-copper fixed point is not adopted in the ITS-90 temperature standard, the temperature value of the fixed point falls between the zinc fixed point and the defined fixed point of the aluminum fixed point and a good reproduction level which is less than 30mK, and the fixed point can be used as an auxiliary fixed point of a radiation temperature standard device in the temperature range of 420 ℃ to 660 ℃, the temperature range of the calibration fixed point of the infrared radiation thermometer is extended, and the accuracy of the temperature measurement of the radiation thermometer is improved.
Description
Technical Field
The invention relates to the technical field of temperature measurement, in particular to a portable aluminum-copper fixed point black body furnace and application thereof.
Background
As is well known, temperature is a basic physical quantity, and temperature measurement plays an important role in science and production, so that establishing a high-precision reproduction international temperature scale (ITS-90) has a long-term and profound influence on the development of science and production. In order to establish a high-precision reproduction system of a new international temperature scale in the range of 0-961.78, the fixed point of the international temperature scale definition in the range must be reproduced with high precision: silver, aluminum, zinc and tin solidification points. Temperature fixing points using phase change of a substance are widely used for setting a temperature scale, calibrating a thermometer, and the like. It is a very useful method to verify the accuracy of the interpolation formula and confirm the continuity of the scale at the boundary between the contact thermometer and the radiation thermometer, for which the use of the temperature fixing point is used. The fixed point is mainly used for reproducing high-accuracy thermometers such as international temperature scales, indexing standard platinum resistance thermometers, standard thermocouples and the like. The fixed point has the outstanding advantages of good reproducibility, high accuracy, no need of a standard thermometer in indexing and the like. The comparison method verification needs to repeatedly measure the standard thermometer and the indicating value of the detected thermometer for many times so as to reduce errors caused by temperature drift. The fixed-point graduation, since its temperature is constant and its temperature value is known, requires in principle only one reading. The medium-temperature fixed point black body radiation source is a standard device for indexing near-infrared standard radiation thermometers and transferring international temperature scales, and the quality of the performance of the medium-temperature fixed point black body radiation source directly limits the indexing level of the near-infrared radiation thermometers, so that the establishment of the medium-temperature fixed point black body radiation source (tin, zinc, aluminum and the like) with excellent performance is also important. However, for the medium-temperature zone, the temperature intervals of some fixed points are too large, so that the accuracy of the interpolation formula is influenced to a certain extent, and therefore, some new fixed points need to be explored for the purpose, and the reproducibility of the fixed points needs to be measured through experiments.
Disclosure of Invention
The invention aims to provide a portable aluminum-copper fixed point black body furnace, which solves the key problem of large interval between fixed points of a domestic medium temperature zone; the accuracy of the interpolation formula and the accuracy of the thermometer are improved.
In order to achieve the purpose, the invention provides the following scheme: the invention provides a portable aluminum-copper fixed point black body furnace, which comprises a portable fixed point furnace and an aluminum-copper fixed point crucible, wherein the aluminum-copper fixed point crucible is arranged in the portable fixed point furnace; the aluminum-copper fixed point crucible comprises a rear base, a shell and a blackbody cavity, wherein the shell is fixed with the rear base through threads, the blackbody cavity is arranged in the shell, and an aluminum-copper eutectic alloy is filled between the blackbody cavity and the shell; a sleeve is inserted in the shell, the blackbody cavity is inserted in the sleeve, and two ends of the sleeve are respectively in contact connection with the rear base and the blackbody cavity; the top of the shell is provided with a top cover, the top cover is detachably connected with the shell, the middle of the top cover is detachably connected with a diaphragm, and the diaphragm is detachably connected with the blackbody cavity; the black body cavity bottom is provided with movable base, back base top is seted up the recess, movable base with the recess looks adaptation.
Preferably, the emissivity of the diaphragm is not lower than 0.999.
Preferably, the shell is a graphite shell, the top cover and the rear base are both made of heat-insulating materials, and the movable base and the sleeve are both made of metal materials.
Preferably, a gasket is arranged between the movable base and the rear base.
Preferably, the portable fixed point furnace is a three-section heating type temperature controller, the middle part of the three-section heating type temperature controller is a main control area, and two ends of the three-section heating type temperature controller are auxiliary heating areas.
Preferably, temperature acquisition sensors are arranged in the main control area and the auxiliary heating area, and the portable fixed-point furnace is used.
Preferably, the portable fixed point furnace is of a horizontal structure, the portable fixed point furnace comprises a furnace body, and a handle is embedded in the top of the furnace body; a partition plate is fixedly mounted in the furnace body, the partition plate divides the inner space of the furnace body into a heating hearth and a control cavity, and the heating hearth is positioned above the control cavity; the heating furnace is characterized in that a heating furnace core is arranged in the heating furnace chamber, a heat preservation layer is arranged between the heating furnace core and the side wall of the heating furnace chamber, a soaking cylinder is arranged in the middle of the heating furnace core, a furnace opening is formed in the side wall of the furnace body, and the furnace opening corresponds to the soaking cylinder.
Preferably, the aluminum-copper fixed point crucible is installed in the soaking cylinder, one end of the soaking cylinder, which is far away from the furnace opening, is provided with an air duct, and the tail end of the air duct extends out of the furnace body and is connected with an air charging device. And the protective gas is filled into the soaking cylinder by using the gas guide tube, so that the crucible with the fixed point of aluminum and copper is protected from air oxidation.
Preferably, an exhaust fan is installed in the control cavity, a grid group is arranged on the furnace body, and the exhaust fan and the grid group are correspondingly arranged.
Preferably, the heat-insulating layer is an aluminum silicate layer, and the soaking cylinder is a red copper soaking cylinder.
A method for reproducing aluminum and copper fixed points by using a portable aluminum and copper fixed point black body furnace comprises the following steps:
1) Pouring aluminum-copper fixing points; cleaning and baking the crucible with the empty aluminum-copper fixed point, preparing 29% of aluminum-copper metal material by mass, pre-melting the metal into eutectic, and then flowing the eutectic metal into the crucible until the volume of the crucible is 95% full of the metal;
2) Reproduction; placing the aluminum-copper fixed-point crucible into a portable fixed-point furnace, firstly setting a target temperature 528 ℃ and a temperature 568 ℃ on a lower platform in a fusing process, and setting the stabilization time of an upper platform to be longer than that of a melting temperature plateau for 40min; when the condensation process starts, setting the furnace temperature at 528 ℃ and the temperature 20 ℃ lower than the solidification temperature;
3) Collimating the light; the portable fixed point furnace is irradiated by a cold light source, the target of the radiation thermometer is aimed at the diaphragm of the crucible, the eyepiece is adjusted to enable the diaphragm black circle of the radiation thermometer to be clear, and then the focal length is adjusted until the opening of the black body crucible at the fixed point of the visual field is clear;
4) Collecting temperature; and (3) automatically acquiring the temperature by using a radiation thermometer, and calibrating the indication error of the radiation thermometer by using a melting platform with an aluminum-copper fixed point.
Compared with the prior art, the invention discloses the following technical effects:
1. according to the portable blackbody furnace with the aluminum-copper fixed points, provided by the invention, the melting and reproduction of the aluminum-copper fixed points are realized by combining a PLC three-section temperature control mode with the characteristic of the red copper aluminizing soaking block, the uniformity of a temperature field can be improved, the duration time of a temperature plateau is prolonged, and the reproduction level is improved.
2. The portable aluminum-copper fixed point black body furnace can be used for interpolation graduation of a standard radiation thermometer or used as a standard temperature source for stability assessment of the radiation thermometer, and high performance of a temperature field and automation of fixed point reproduction are achieved.
3. The aluminum-copper eutectic point fixed point determined by the invention is not defined in the ITS-90 temperature scale, and the temperature value is between the zinc fixed point and the defined fixed point of the aluminum fixed point, so that the aluminum-copper eutectic point fixed point can be used as an auxiliary fixed point of a radiation temperature standard device in the temperature range of 420 ℃ to 660 ℃, the temperature range inserted by the radiation thermometer can be improved, and the temperature measuring accuracy of the radiation thermometer is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without inventive exercise.
FIG. 1 is a schematic structural view of an aluminum-copper fixed-point crucible of the present invention;
FIG. 2 is a schematic view of a portable fixed point stove according to the present invention;
FIG. 3 is a graph of melting values versus solidification values;
wherein, 1-a gasket; 2-a diaphragm; 3-blackbody cavity; 4-rear base; 5-a movable base; 6-a sleeve; 7-a housing; 8-furnace body; 9-a partition plate; 10-a handle; 11-heating the furnace core; 12-soaking cylinder; 13-furnace mouth; 14-gas circuit electromagnetic valve; 15-grid group; 16-touch screen.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The invention provides a portable aluminum-copper fixed point black body furnace, which comprises a portable fixed point furnace and an aluminum-copper fixed point crucible, wherein the aluminum-copper fixed point crucible is arranged in the portable fixed point furnace; the crucible with the aluminum-copper fixed point comprises a rear base 4, a shell 7 and a blackbody cavity 3, wherein the shell 7 is fixed with the rear base 4 through threads, the blackbody cavity 3 is arranged in the shell 7, and an aluminum-copper eutectic alloy is filled between the blackbody cavity 3 and the shell 7; a sleeve 6 is inserted in the shell 7, the blackbody cavity 3 is inserted in the sleeve 6, and two ends of the sleeve 6 are respectively in contact connection with the rear base 4 and the blackbody cavity 3; the top cover is arranged at the top of the shell 7, the top cover is detachably connected with the shell 7, the middle of the top cover is detachably connected with the diaphragm 2, the diaphragm 2 is detachably connected with the blackbody cavity 3, and the emissivity of the diaphragm 2 is not lower than 0.999, so that the requirements of different aiming target areas of the radiation thermometer are met; the black body cavity 3 is provided with a movable base 5 at the bottom, the top end of the rear base 4 is provided with a groove, and the movable base 5 is matched with the groove.
Further, the shell 7 is a graphite shell 7, the top cover and the rear base 4 are both made of heat insulation materials, and the movable base 5 and the sleeve 6 are both made of metal materials.
Further, a gasket 1 is arranged between the movable base 5 and the rear base 4.
Furthermore, the portable fixed point furnace is a three-section heating type temperature controller to ensure that the temperature difference between the front section and the rear section of the hearth can be within 1 ℃, the middle part of the three-section heating type temperature controller is a main control area, and the two ends of the three-section heating type temperature controller are auxiliary heating areas; temperature acquisition sensors are arranged in the main control area and the auxiliary heating area; the portable fixed point furnace is of a horizontal structure and adopts a high-temperature-resistant nickel-chromium ferroelectric heating mode, the portable fixed point furnace comprises a furnace body 8, and a handle 10 is embedded in the top of the furnace body 8; a partition plate 9 is fixedly installed in the furnace body 8, the partition plate 9 divides the inner space of the furnace body 8 into a heating hearth and a control cavity, and the heating hearth is positioned above the control cavity; the heating furnace is characterized in that a heating furnace core 11 is arranged in the heating furnace, a heat preservation layer is arranged between the heating furnace core 11 and the side wall of the heating furnace, the heat preservation layer is an aluminum silicate layer, a soaking cylinder 12 is arranged in the middle of the heating furnace core 11, the soaking cylinder 12 is a red copper soaking cylinder, a furnace opening 13 is formed in the side wall of the furnace body 8, and the furnace opening 13 corresponds to the soaking cylinder 12. The circuit part is installed to the control intracavity, for convenient installation, arranges the circuit on a metal sheet, and the later maintenance of being convenient for is installed wholly to the integer.
The crucible with the aluminum-copper fixed point is arranged in a soaking cylinder 12, an air duct is arranged at one end, away from a furnace mouth 13, of the soaking cylinder 12, an air path electromagnetic valve 14 is arranged on the air duct, and the tail end of the air duct extends out of the furnace body 8 and is connected with an air charging device. The protective gas is filled into the soaking cylinder 12 by using the gas guide tube, so that the crucible with the aluminum copper fixed point is protected from air oxidation. In order to prevent the graphite from being oxidized at high temperature, the amount of high-purity argon introduced with inert protective gas needs to be controlled, and an automatic gas on-off protection function is adopted. When the temperature is higher than 150 ℃, the gas circuit electromagnetic valve 14 is opened; when the temperature is lower than 150 ℃, the gas circuit electromagnetic valve 14 is closed to save high-purity argon.
Furthermore, for the convenience of timely heat dissipation in the control cavity, the exhaust fan is installed in the control cavity for protecting the circuit, the grid group 15 is arranged on the furnace body 8, and the exhaust fan corresponds to the grid group 15.
The crucible structure with the fixed point of aluminum and copper is shown in figure 1, a cylindrical conical blackbody cavity 3 structure is adopted, a vertical vacuum infusion mode is adopted, high-purity aluminum and high-purity copper metal are fused and eutectic, and the specific parameters are shown in table 1:
TABLE 1 fixed Point specifications
An aluminum copper fixed point reproduction method comprises the following steps:
1) Pouring aluminum-copper fixing points; cleaning and baking the crucible with the empty aluminum-copper fixed point, preparing 29% of aluminum-copper metal material by mass, pre-melting the metal into eutectic, and enabling the eutectic metal to flow into the crucible until the volume of the crucible is 95% full of the metal;
2) Reproduction; placing the aluminum-copper fixed-point crucible into a portable fixed-point furnace, wherein the target temperature set by a lower platform in the melting process is 528 ℃, the set temperature of an upper platform is 568 ℃ and is higher than the melting point temperature by 20 ℃, and because enough heat is needed in the melting process, the stabilization time of the upper platform is long enough, and the time is longer than the melting temperature plateau for 40min; when the solidification process starts, setting the furnace temperature to 528 ℃ and lower than the solidification temperature by 20 ℃;
3) Calibrating the light; the fixed point furnace is irradiated by adopting a cold light source, the target of the radiation thermometer is aimed at the diaphragm of the crucible, the ocular lens is adjusted to enable the black ring of the diaphragm of the radiation thermometer to be clear, and then the focal length is adjusted until the opening of the black body crucible at the fixed point of the visual field is clear;
4) Collecting temperature; and (3) automatically acquiring the temperature by using a radiation thermometer, and calibrating the indication error of the radiation thermometer by using a melting platform with an aluminum-copper fixed point.
And installing LabView software, realizing data communication with a computer through a GPIB data line, installing a GPIB data line driving program, opening an acquisition program, and testing the communication with the computer. After the program normally runs, the photoelectric end cover is covered firstly, and the dark current is measured for 2 min. Setting the whole acquisition time for 2h; after the melt congealing, a set of 2min dark currents was measured again. After the collection temperature reaches the upper platform temperature, in order to save time, the jumping operation can be carried out, and the next cooling solidification stage is carried out.
The measurement results are shown in fig. 3. As can be seen from the figure, the melting value is larger than the solidification value, the solidification time is longer than 20min, and the curve is smooth. The melting and solidification values are plotted in a table, and as a result, as shown in table 2, the difference between melting and solidification is within 0.2 ℃, the melting temperature value is greater than the solidification temperature value, and the melting temperature value is generally used as the temperature characteristic value of the Al-Cu eutectic point. From the results of two times, the reproducibility of the Al-Cu portable fixed point furnace is better than 0.03 ℃, and the good reproducibility is shown.
TABLE 2 melting and solidification values
| Al-Cu | Melting | Coagulation | Difference in fusion |
| 08/08 | 548.23 | 548.06 | 0.17 |
| 08/09 | 548.20 | 548.01 | 0.19 |
In the description of the present invention, it is to be understood that the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, are merely for convenience of description of the present invention, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solutions of the present invention can be made by those skilled in the art without departing from the spirit of the present invention, and the technical solutions of the present invention are within the scope of the present invention defined by the claims.
Claims (4)
1. A portable aluminum-copper fixed point black body furnace is characterized by comprising a portable fixed point furnace and an aluminum-copper fixed point crucible, wherein the aluminum-copper fixed point crucible is arranged in the portable fixed point furnace; the aluminum-copper fixed point crucible comprises a rear base (4), a shell (7) and a blackbody cavity (3), wherein the shell (7) is fixed with the rear base (4) through threads, the blackbody cavity (3) is arranged in the shell (7), and aluminum-copper eutectic alloy is filled between the blackbody cavity (3) and the shell (7); a sleeve (6) is inserted in the shell (7), the blackbody cavity (3) is inserted in the sleeve (6), and two ends of the sleeve (6) are respectively in contact connection with the rear base (4) and the blackbody cavity (3); a top cover is arranged at the top of the shell (7), the top cover is detachably connected with the shell (7), a diaphragm (2) is detachably connected with the middle of the top cover, and the diaphragm (2) is detachably connected with the blackbody cavity (3); a movable base (5) is arranged at the bottom of the blackbody cavity (3), a groove is formed in the top end of the rear base (4), and the movable base (5) is matched with the groove;
the portable fixed point furnace is a three-section heating type temperature controller, the middle part of the three-section heating type temperature controller is a main control area, and two ends of the three-section heating type temperature controller are auxiliary heating areas; the portable fixed point furnace is of a horizontal structure and comprises a furnace body (8), and a handle (10) is embedded in the top of the furnace body (8); a partition plate (9) is fixedly installed in the furnace body (8), the partition plate (9) divides the inner space of the furnace body (8) into a heating hearth and a control cavity, and the heating hearth is positioned above the control cavity; a heating furnace core (11) is arranged in the heating furnace cavity, a heat insulation layer is arranged between the heating furnace core (11) and the side wall of the heating furnace cavity, a soaking cylinder (12) is arranged in the middle of the heating furnace core (11), the heat insulation layer is an aluminum silicate layer, and the soaking cylinder (12) is a red copper soaking cylinder; a furnace mouth (13) is formed in the side wall of the furnace body (8), and the furnace mouth (13) is arranged corresponding to the soaking cylinder (12); the crucible with the aluminum-copper fixed point is arranged in the soaking cylinder (12), the end, far away from the furnace opening (13), of the soaking cylinder (12) is provided with an air duct, and the tail end of the air duct extends out of the furnace body (8) and is connected with an air charging device.
2. The portable aluminum-copper fixed point blackbody furnace of claim 1, wherein: the emissivity of the diaphragm (2) is not lower than 0.999.
3. The portable aluminum-copper fixed point blackbody furnace of claim 1, wherein: an exhaust fan is installed in the control cavity, a grid group (15) is arranged on the furnace body (8), and the exhaust fan corresponds to the grid group (15).
4. An aluminum-copper fixed point reproduction method using the portable aluminum-copper fixed point black body furnace of claim 1, characterized by comprising the steps of:
1) Pouring aluminum-copper fixing points; cleaning and baking the crucible with the empty aluminum-copper fixed point, preparing 29% of aluminum-copper metal material by mass, pre-melting the metal into eutectic, and enabling the eutectic metal to flow into the crucible until the volume of the crucible is 95% full of the metal;
2) Reproduction; placing the aluminum-copper fixed-point crucible into a portable fixed-point furnace, firstly setting a target temperature 528 ℃ and a temperature 568 ℃ on a lower platform in a fusing process, and setting the stabilization time of an upper platform to be longer than that of a melting temperature plateau for 40min; when the condensation process starts, setting the furnace temperature at 528 ℃ and the temperature 20 ℃ lower than the solidification temperature;
3) Collimating the light; the portable fixed point furnace is irradiated by a cold light source, the target of the radiation thermometer is aimed at the diaphragm of the crucible, the eyepiece is adjusted to enable the diaphragm black circle of the radiation thermometer to be clear, and then the focal length is adjusted until the opening of the black body crucible at the fixed point of the visual field is clear;
4) Collecting temperature; and (3) automatically acquiring the temperature by using a radiation thermometer, and calibrating the indication error of the radiation thermometer by using a melting platform with an aluminum-copper fixed point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
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| JP2987459B1 (en) * | 1998-12-11 | 1999-12-06 | 工業技術院長 | Temperature fixed point crucible, temperature fixed point device and thermometer calibration method |
| CN100516833C (en) * | 2003-12-23 | 2009-07-22 | 中国印钞造币总公司 | Albronze spectral standard sample and manufacturing method thereof |
| JP6041347B2 (en) * | 2013-02-18 | 2016-12-07 | 国立研究開発法人産業技術総合研究所 | Fixed point crucible and fixed point blackbody furnace |
| CN104549594B (en) * | 2015-01-23 | 2016-04-13 | 中国航空工业集团公司北京长城计量测试技术研究所 | A kind of metal-carbon high temperature eutectic point reproduction crucible |
| CN109506784A (en) * | 2018-11-22 | 2019-03-22 | 北京航天计量测试技术研究所 | A kind of standard black body radiation source based on fixed point temperature level ground technology |
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