CN104483241A - Graphite diffusion platform - Google Patents
Graphite diffusion platform Download PDFInfo
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- CN104483241A CN104483241A CN201410816423.0A CN201410816423A CN104483241A CN 104483241 A CN104483241 A CN 104483241A CN 201410816423 A CN201410816423 A CN 201410816423A CN 104483241 A CN104483241 A CN 104483241A
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Abstract
The invention discloses a graphite diffusion platform. The platform is characterized in that a cylindrical base consists of an L-shaped lower half base integrally formed by a left side plate and a bottom seat and an inverted-L-shaped upper half base integrally formed by a right side plate and a top cover plate; a rectangular cavity is formed in the waist of the cylindrical base consisting of the lower half base and the upper half base; a diffusion unit is arranged in the rectangular cavity, a rectangular fixed block is fixedly arranged on the bottom seat, and a sliding shearing block is arranged between the rectangular fixed block and the top cover plate and can be guided by the rectangular cavity to slide radially; a first lower column cavity and a second lower column cavity are formed in the fixed block respectively; a first upper column cavity and a second upper column cavity are formed in the sliding shearing block respectively. With the adoption of the platform, the hole-alignment accuracy is improved effectively, effects caused by free surfaces of alloy melt on the diffusion coefficient during diffusion are eliminated, and the measurement accuracy of the diffusion coefficient is further improved.
Description
Technical field
This is bright relates to a kind of graphite diffusion platform based on slip shearing mechanism, in particular for the measurement of binary or multicomponent alloy or other nonmetallic materials interdiffusion coefficient in the molten state.
Background technology
The dispersal behavior of metal bath is played an important role in the process of setting of melt, is the crucial kinetic parameter affecting crystal nucleation and growth process.The coefficient of diffusion changing melt directly can change component distributing and the microscopic appearance of solidified structure, and therefore, the coefficient of diffusion of metal bath is also one of parameters necessary carrying out metal material design.Consider that metal bath is the special disordered structure system of a class, its structure is relatively simple, can describe with hard sphere close packing model, therefore study a kind of like this mass transport character of system, contribute to the universal law of the mass transport process of deep understanding disordered state system.For the alloy system of some uniqueness, the dispersal behavior of its melt correspondingly shows singularity, such as, in block metal glass alloy melt, its coefficient of diffusion 2-3 order of magnitude less of general simple metal melt, show typically slow dispersal behavior, the coefficient of diffusion therefore studying melt is also the importance of understanding alloy melt character.Since the paper about Brownian movement that the discovery of 1855 Fick'ss law of diffusion and einstein in 1905 are delivered, people have had the history of more than 100 year to the research of liquid diffusion phenomena, but the research of people's liquid towards metal dispersal behavior only has the time of decades, and measuring technique and theory are all immature.Such as, the coefficient of diffusion measuring same system with diverse ways is often widely different, and some difference are even more than one times.
Summary of the invention
The present invention is in order to avoid the weak point existing for above-mentioned prior art, provides a kind of graphite diffusion platform, to improve hole precision, eliminates alloy melt Free Surface in the process of diffusion and, on the impact of coefficient of diffusion, and then improves the measuring accuracy of coefficient of diffusion.
The present invention is that technical solution problem adopts following technical scheme:
A kind of graphite diffusion platform of the present invention, its design feature is
Right cylinder pedestal is set, is be integrated into second pedestal of " L " shape with base with left plate, is integrated into first pedestal of " L " shape of back-off with right plate and top blind flange; The right cylinder pedestal be made up of second pedestal described and first pedestal forms a rectangular cavity at waist, and described rectangular cavity is radially through on described right cylinder;
Arranging diffusion unit, is in described rectangular cavity, and a rectangle fixed block is fixedly installed on base, and a slip cutout is placed between described rectangle fixed block and top blind flange, and can with described rectangular cavity for guiding is radially slided; Described fixed block arranges the first lower prop chamber and the second lower prop chamber respectively; Described slip cutout arranges the first upper prop chamber and the second upper prop chamber respectively;
Described first lower prop chamber, the second lower prop chamber, the first upper prop chamber and the second upper prop chamber distribute on respective diverse location, obtain following two different mode bits by mobile described slip cutout:
Mode bit one: the first lower prop chamber and the first upper prop chamber are in coaxial position, are butted into a connected chamber as diffusion samples chamber up and down; Second lower prop chamber and the second upper prop chamber are in coaxial position, are butted into a connected chamber as sample cavity up and down;
Mode bit two: the first lower prop chamber and the second upper prop chamber are in coaxial position, are butted into a connected chamber as butt joint diffusion sample cavity up and down; Second lower prop chamber is closed by the bottom end face of the cutout that slides; First upper prop chamber is by the top end face closure of fixed block.
Graphite diffusion platform of the present invention, its design feature is also: in described diffusion samples chamber, bottom chamber, be followed successively by bottom graphite felt, lower floor's graphite flake, diffusion samples and top layer graphite felt that 2mm is thick to top of chamber, the diffusion samples be in the first lower prop chamber extends in the first upper prop chamber; In described sample cavity, bottom chamber, be followed successively by the thick top layer graphite flake of lower floor's graphite felt, graphite column, sample, pad sample that 3mm is thick, the upper strata graphite flake of 1mm, upper strata graphite felt and 2mm to top of chamber, the sample be in the second upper prop chamber extends in the second lower prop chamber.
Graphite diffusion platform of the present invention, its design feature is also: on described base, is on relevant position is provided with centered cylinder groove with the first lower prop chamber in described fixed block, and described bottom graphite felt and the thick lower floor's graphite flake of 2mm are placed in described centered cylinder groove.
Graphite diffusion platform of the present invention, its design feature is also: described slip cutout is at one end extended with postioning abutment downwards, and with the inner side plane of described postioning abutment for confined planes, it is spacing that the spacing plane of the correspondence be butted on fixed block with described confined planes forms slip.
Compared with existing technology, effect of the present invention is embodied in:
1, graphite diffusion platform of the present invention is rational in infrastructure, is easy to assembling, can ensures assembly precision, shears tandem docking accurate, effectively improves measuring accuracy.
2, the present invention is in diffusion samples chamber and sample cavity, respectively the filling material such as graphite felt, graphite flake is set in bottom and end face for diffusion samples and sample, form pressure effect, effectively reduce the impact of the surface tension in diffusion process on Free Surface on diffusion system, for raising measuring accuracy, there is especially significant effect.
Accompanying drawing explanation
Fig. 1 is integral installation figure outward appearance of the present invention;
Fig. 2 is the explosive view of graphite diffusion platform of the present invention;
Fig. 3 a is graphite diffusion platform sample of the present invention schematic diagram before docking;
Fig. 3 b is graphite diffusion platform sample of the present invention schematic diagram after docking;
Fig. 4 a utilizes the present invention to carry out the intact sample Electronic Speculum figure of docking in measuring process;
Fig. 4 b adopts prior art to carry out the sample Electronic Speculum figure that the docking in the process measured completes;
Fig. 5 is at La
65al
10cu
25the measurement Al-Cu interdiffusion coefficient time-dependent relation figure using the present invention and prior art to carry out in system.
Number in the figure: 1 tungsten bar, 2 trip bolts, 3 contiguous blocks, 4 ceramic pipes, 5 first pedestals, 5a top blind flange, 6 postioning abutments, 6c slip cutout, 7 spacing planes, 7c fixed block, 8 second pedestals, 8a base, 11 bottom graphite felt, 12 lower floor's graphite flakes, 13 diffusion samples, 14 stainless steel bars, 15 top layer graphite felt, 16 lower floor's graphite felt, 17 graphite columns, 18 samples, 19 pad sample, 20 upper strata graphite flakes, 21 upper strata graphite felt, 22 top layer graphite flakes, 23a diffusion samples chamber, 23b sample cavity, 23c butt joint diffusion sample cavity.
Embodiment
See Fig. 2, Fig. 3 a and Fig. 3 b, in the present embodiment, the version of graphite diffusion platform is:
Arranging right cylinder pedestal, is be integrated into second pedestal 8 of " L " shape with left plate with base 8a, is integrated into first pedestal 5 of " L " shape of back-off with right plate and top blind flange 5a; The right cylinder pedestal be made up of second pedestal 8 and first pedestal 5 forms a rectangular cavity at waist, and rectangular cavity is radially through on the cylinder.
Arranging diffusion unit, is in rectangular cavity, and a rectangle fixed block 7c utilizes stainless steel bar 14 to be fixedly installed on base 8a; One slip cutout 6c is placed between rectangle fixed block 7c and top blind flange 5a, and can be that guiding is radially slided with rectangular cavity; Fixed block 7c arranges the first lower prop chamber and the second lower prop chamber respectively; Slip cutout 5 arranges the first upper prop chamber and the second upper prop chamber respectively.
First lower prop chamber, the second lower prop chamber, the first upper prop chamber and the second upper prop chamber distribute on respective diverse location, obtain following two different mode bits by mobile slip cutout 6c.
Mode bit one: the first lower prop chamber as shown in Figure 3 a and the first upper prop chamber are in coaxial position, are butted into a connected chamber as diffusion samples chamber 23a up and down; Second lower prop chamber and the second upper prop chamber are in coaxial position, are butted into a connected chamber as sample cavity 23b up and down, and mode bit one is as preheat mode, and under preheat mode, diffusion samples chamber 23a and sample cavity 23b is state separated from one another.
Mode bit two: the first lower prop chamber as shown in Figure 3 b and the second upper prop chamber are in coaxial position, are butted into a connected chamber as butt joint diffusion sample cavity 23c up and down; Second lower prop chamber is closed by the bottom end face of the cutout 6c that slides; First upper prop chamber is by the top end face closure of fixed block 7c, and mode bit two is as diffusion and state of cooling position.
In the present embodiment, as shown in Figure 2, in diffusion samples chamber, bottom chamber, be followed successively by bottom graphite felt 11, lower floor's graphite flake 12, diffusion samples 13 and top layer graphite felt 15 that 2mm is thick to top of chamber, the diffusion samples 13 be in the first lower prop chamber extends in the first upper prop chamber; In sample cavity, be followed successively by lower floor's graphite felt 16, be highly top layer graphite flake 22 that the upper strata graphite flake 20 of the graphite column 17 of 1.5mm, sample 18, pad sample 19 that 3mm is thick, 1mm, upper strata graphite felt 21 and 2mm are thick to top of chamber bottom chamber, the sample 18 be in the second upper prop chamber extends in the second lower prop chamber, wherein, pad sample 19 is diameter and the sheet metal being highly 3mm, is identical material with sample 18.This structure forms pressure effect, effectively reduces the impact of the surface tension in diffusion process on Free Surface on diffusion system, has especially significant effect for raising measuring accuracy.Fig. 5 is at La
65al
10cu
25the experiment of the measurement Al-Cu interdiffusion coefficient carried out in system, the time-dependent relation of coefficient of diffusion as can be seen from Fig. 5, all experiments through pressurization are along with the also orderly increase of the increase diffusion length of temperature retention time.And all diffusion length can carry out linear fit in error range.Round dot shown in Fig. 5 is that in experiment not measured by pressurization, it obviously deviate from the data of pressurization.This shows can reduce convection current that in diffusion process, some Free Surfaces cause to the impact of coefficient of diffusion by pressurization.
In concrete enforcement, corresponding vibrational power flow is also included in:
As shown in Figure 2, on base 8a, be on relevant position with the first lower prop chamber in fixed block 7c and be provided with centered cylinder groove, in bottom graphite felt 11 and the thick lower floor's graphite flake 12 centering cylindrical groove of 2mm.
As depicted in figs. 1 and 2, slip cutout 6c is at one end extended with postioning abutment 6 downwards, and with the inner side plane of postioning abutment 6 for confined planes, it is spacing that the correspondence spacing plane 7 be butted on fixed block 7c with confined planes forms slip.
As shown in Figure 1, the heating unit in the present embodiment is the external mounting heating component at graphite diffusion platform, comprises tungsten bar 1, and tungsten bar 1 is set with ceramic pipe 4, is fixed between each tungsten bar by contiguous block 3 and trip bolt 2.
Right cylinder pedestal in the present embodiment is arranged with its second pedestal 8 of " L " shape and first pedestal 5 split of inverted "L" shaped, is very easy to assembling, and improves operability.The height in the present embodiment, graphite diffusion platform being placed slide block and fixed block part adds certain overgauge, upper and lower graphite diffusion platform be fixedly held out against by the hole alundum tube of graphite diffusion platform Up/down base, in experimentation, slide block can push through smoothly like this.
Fig. 4 b adopts existing device to carry out docking sample docking in the process of experiment to form the phenomenon of dislocation, and due to docking dislocation, effective diffusion cross section of sample is long-pending to be reduced, and this will cause measured coefficient of diffusion less than real coefficient of diffusion.Fig. 4 a is depicted as the intact sample Electronic Speculum figure of the docking that utilizes graphite diffusion platform in the present embodiment to carry out measuring, can find out that in the present embodiment, joint inconsistent phenomenon obviously improves from Fig. 4 a.
Claims (4)
1. a graphite diffusion platform, is characterized in that:
Right cylinder pedestal is set, is be integrated into second pedestal of " L " shape (8) with left plate with base (8a), is integrated into first pedestal of " L " shape (5) of back-off with right plate and top blind flange (5a); The right cylinder pedestal be made up of described second pedestal (8) and first pedestal (5) forms a rectangular cavity at waist, and described rectangular cavity is radially through on described right cylinder;
Diffusion unit is set, in described rectangular cavity, one rectangle fixed block (7c) is fixedly installed on base (8a), one slip cutout (6c) is placed between described rectangle fixed block (7c) and top blind flange (5a), and can with described rectangular cavity for guiding is radially slided; Described fixed block (7c) arranges the first lower prop chamber and the second lower prop chamber respectively; Described slip cutout (5) arranges the first upper prop chamber and the second upper prop chamber respectively;
Described first lower prop chamber, the second lower prop chamber, the first upper prop chamber and the second upper prop chamber distribute on respective diverse location, obtain following two different mode bits by mobile described slip cutout (6c):
Mode bit one: the first lower prop chamber and the first upper prop chamber are in coaxial position, are butted into a connected chamber as diffusion samples chamber (23a) up and down; Second lower prop chamber and the second upper prop chamber are in coaxial position, are butted into a connected chamber as sample cavity (23b) up and down;
Mode bit two: the first lower prop chamber and the second upper prop chamber are in coaxial position, are butted into a connected chamber as butt joint diffusion sample cavity (23c) up and down; Second lower prop chamber is closed by the bottom end face of the cutout that slides (6c); First upper prop chamber is by the top end face closure of fixed block (7c).
2. graphite diffusion platform according to claim 1, it is characterized in that: in described diffusion samples chamber, bottom chamber, be followed successively by bottom graphite felt (11), lower floor's graphite flake (12), diffusion samples (13) and top layer graphite felt (15) that 2mm is thick to top of chamber, the diffusion samples (13) be in the first lower prop chamber extends in the first upper prop chamber; In described sample cavity, bottom chamber, be followed successively by the thick top layer graphite flake (22) of lower floor's graphite felt (16), graphite column (17), sample (18), pad sample (19) that 3mm is thick, the upper strata graphite flake (20) of 1mm, upper strata graphite felt (21) and 2mm to top of chamber, the sample (18) be in the second upper prop chamber extends in the second lower prop chamber.
3. graphite diffusion platform according to claim 1, it is characterized in that: on described base (8a), be on relevant position with the first lower prop chamber in described fixed block (7c) and be provided with centered cylinder groove, described bottom graphite felt (11) and the thick lower floor's graphite flake (12) of 2mm are placed in described centered cylinder groove.
4. graphite diffusion platform according to claim 1, it is characterized in that: described slip cutout (6c) is at one end extended with postioning abutment (6) downwards, with the inner side plane of described postioning abutment (6) for confined planes, it is spacing that the spacing plane of correspondence (7) be butted on fixed block (7c) with described confined planes forms slip.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410816423.0A CN104483241A (en) | 2014-12-23 | 2014-12-23 | Graphite diffusion platform |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410816423.0A CN104483241A (en) | 2014-12-23 | 2014-12-23 | Graphite diffusion platform |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606492A (en) * | 2015-09-08 | 2016-05-25 | 合肥工业大学 | Mutual diffusion coefficient measurement method able to eliminate cooling process influence |
| CN107132154A (en) * | 2015-09-08 | 2017-09-05 | 合肥工业大学 | A kind of application of liquid metal density measuring apparatus |
| CN109507066A (en) * | 2018-10-24 | 2019-03-22 | 合肥工业大学 | A kind of metal solid diffusion facilities |
Citations (3)
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| CN101319979A (en) * | 2007-06-05 | 2008-12-10 | 中国科学院化学研究所 | Method for fast measuring dispersion coefficient of matter in liquid phase by capillary electrophoresis apparatus |
| JP4621385B2 (en) * | 2001-07-26 | 2011-01-26 | 独立行政法人 宇宙航空研究開発機構 | Diffusion test equipment |
| CN103234872A (en) * | 2013-04-27 | 2013-08-07 | 合肥工业大学 | Equipment for measuring metal melt diffusion by using multi-layer translation shearing unit method |
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2014
- 2014-12-23 CN CN201410816423.0A patent/CN104483241A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4621385B2 (en) * | 2001-07-26 | 2011-01-26 | 独立行政法人 宇宙航空研究開発機構 | Diffusion test equipment |
| CN101319979A (en) * | 2007-06-05 | 2008-12-10 | 中国科学院化学研究所 | Method for fast measuring dispersion coefficient of matter in liquid phase by capillary electrophoresis apparatus |
| CN103234872A (en) * | 2013-04-27 | 2013-08-07 | 合肥工业大学 | Equipment for measuring metal melt diffusion by using multi-layer translation shearing unit method |
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| RALUCA ROSU-PFLUMM ET AL.: "Diffusion measurements using the shear cell technique: Investigation of the role of Marangoni convection by pre-flight experiments on the ground and during the Foton M2 mission", 《INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER》 * |
| Y.Y. BAI ET AL.: "β relaxation and its composition dependence in Ce-based bulk metallic glasses", 《JOURNAL OF NON-CRYSTALLINE SOLIDS》 * |
| YONGLIANG GENG ET AL.: "A sliding cell technique for diffusion measurements in liquid metals", 《AIP ADVANCES》 * |
| 胡金亮等: "非晶合金熔体的原子扩散", 《中国材料进展》 * |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105606492A (en) * | 2015-09-08 | 2016-05-25 | 合肥工业大学 | Mutual diffusion coefficient measurement method able to eliminate cooling process influence |
| CN107132154A (en) * | 2015-09-08 | 2017-09-05 | 合肥工业大学 | A kind of application of liquid metal density measuring apparatus |
| CN109507066A (en) * | 2018-10-24 | 2019-03-22 | 合肥工业大学 | A kind of metal solid diffusion facilities |
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Application publication date: 20150401 |