CN107727686B - Laser flash method device for measuring thermal diffusivity and specimen support structure - Google Patents
Laser flash method device for measuring thermal diffusivity and specimen support structure Download PDFInfo
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- CN107727686B CN107727686B CN201711072100.5A CN201711072100A CN107727686B CN 107727686 B CN107727686 B CN 107727686B CN 201711072100 A CN201711072100 A CN 201711072100A CN 107727686 B CN107727686 B CN 107727686B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N25/00—Investigating or analyzing materials by the use of thermal means
- G01N25/20—Investigating or analyzing materials by the use of thermal means by investigating the development of heat, i.e. calorimetry, e.g. by measuring specific heat, by measuring thermal conductivity
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Abstract
Laser flash method device for measuring thermal diffusivity and specimen support structure provided by the invention, specimen support structure include: pallet, support cylinder, turntable, pedestal and at least one sample cell；At least one sample cell is fixedly mounted on pallet, and the installation place of each sample cell offers the first loophole on pallet, and the center of each first loophole is the first pre-determined distance at a distance from the heart of pallet；It is placed on each sample cell at sample and is provided with the second loophole；Each second loophole center and the first loophole center of second loophole lower section are on the same line；Pallet is fixedly mounted at the top of support cylinder, and support cylinder bottom is fixedly mounted on the bearing of turntable, and turntable is fixedly connected with pedestal, and third loophole is provided on pedestal, which is the first pre-determined distance at a distance from first position on pedestal；Wherein, first position are as follows: the position on the center face pedestal of pallet.The present invention can be improved the measurement efficiency of thermal diffusivity.
Description
Technical field
The present embodiments relate to laser flash method thermal diffusivity field of measuring technique more particularly to a kind of laser flash methods
Device for measuring thermal diffusivity and specimen support structure.
Background technique
The principle that laser flash method device for measuring thermal diffusivity is utilized is: it is got on sample using a bundle of pulsed laser,
Sample endothermic temperature increases, and passes through the thermal diffusivity of the available sample of the temperature change of test sample.
It include specimen support structure in existing laser flash method device for measuring thermal diffusivity, which is used for
Sample is supported to complete the measurement of thermal diffusivity.
The usually fixed sample size of existing specimen support structure is 1, therefore is carrying out thermal diffusion to multiple samples
It in the measurement process of rate, needs ceaselessly to replace sample, to reduce the measurement efficiency of thermal diffusivity.
Summary of the invention
The present invention provides a kind of laser flash method device for measuring thermal diffusivity and specimen support structures, to improve thermal diffusion
The measurement efficiency of rate.
In order to achieve the above objectives, the embodiment of the invention provides the samples in a kind of laser flash method device for measuring thermal diffusivity
Product support construction, the specimen support structure include: pallet, support cylinder, turntable, pedestal and at least one sample cell；It is described
At least one sample cell is fixedly mounted on pallet, and the installation place of each sample cell offers the first loophole on pallet, often
The center of a first loophole is the first pre-determined distance at a distance from the center of pallet；Test sample to be checked is placed on each sample cell
The second loophole is provided at product；The center of the first loophole exists below the center of each second loophole and second loophole
On same straight line；The pallet is fixedly mounted at the top of the support cylinder, and the bottom of the support cylinder is fixedly mounted on institute
It states on the bearing of turntable, the turntable is fixedly connected with the base, and third loophole is provided on the pedestal, and the third is saturating
The center of unthreaded hole is first pre-determined distance at a distance from first position on the pedestal；Wherein, the first position are as follows: institute
State the position on pedestal described in the center face of pallet.
Further, each sample cell includes: sample holder and locking cap；It is provided in sample holder and is enclosed by protrusion
At slot, second loophole is equipped at the center of the slot, the size of second loophole is greater than the big of sample to be tested
It is small；The locking cap closely covers the protrusion of the slot surrounding, and the center of the locking cap offers the 4th loophole.
Further, at least one described sample cell circumference uniform distribution is mounted on the pallet.
Further, the quantity of sample cell is 4.
Further, the specimen support structure further includes protective shield of radiation；The protective shield of radiation is located at the support cylinder
It is internal.
Further, the protective shield of radiation includes: support rod, at least one radiation blade, at least one limit sleeve and consolidates
Fixed set；Mounting hole is offered at first position on the base, the bottom end of the support rod is inserted into the mounting hole, institute
It states support rod upper bottom portion and is provided with limit ear, the size of the limit ear is greater than the mounting hole；The support rod is two sections
Formula structure, the support rod is thin segment on last stage, and the next stage of the support rod is thick section；The thin segment of the support rod
On be arranged at least one radiation blade, it is each radiation blade centre bore diameter be less than thick section outer diameter；Be connected two spokes
It penetrates and is arranged with limit sleeve between blade, the top on thin segment is arranged with fixing sleeve, and the bottom of the fixing sleeve closely abuts top
Radiation blade；Each radiation fins on piece offers the 5th loophole, the center of each 5th loophole and the 5th loophole
The distance that place radiates blade center is first pre-determined distance.
Further, the support rod is fixedly mounted on the base.
Further, the quantity for radiating blade is 4.
Further, at least one thermal hole is offered in the support cylinder.
Further, the quantity of thermal hole is 4.
The embodiment of the invention also provides a kind of laser flash method device for measuring thermal diffusivity, described device includes that pulse swashs
Light device, above-mentioned specimen support structure；Third loophole described in the Laser emission port face of the pulse laser.
Further, described device further includes vacuum furnace, and the support cylinder is located at the furnace of the vacuum furnace
In thorax.
Further, described device further includes infrared detector, and the infrared detector is used to examine by the 4th loophole
Survey the surface temperature of sample to be tested.
Further, described device further includes temperature measurer and temperature sensor；Through-hole, the temperature are offered at tray center
The top of sensor is spent by the through-hole, and the temperature measurer is electrically connected with the temperature sensor.
Using laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention and specimen support structure, Neng Gouti
The measurement efficiency of high thermal diffusivity.
Detailed description of the invention
Fig. 1 is the knot of the specimen support structure in laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention
Structure schematic diagram；
Fig. 2 is bowing for the specimen support structure in laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention
View；
Fig. 3 is the structural schematic diagram of sample cell；
Fig. 4 is the structural schematic diagram of protective shield of radiation；
Fig. 5 is the structural schematic diagram of the barrel support with thermal hole；
Fig. 6 is the structural schematic diagram of laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention.
Drawing reference numeral explanation:
1- sample cell；2- pallet；3- support cylinder；4- turntable；5- protective shield of radiation；6- temperature sensor；7- pedestal；8- sample
Product supporting table；9- locking cap；10- thermal diffusivity sample；11- support rod；12- radiates blade；13- limit sleeve；14- fixing sleeve；
15- vacuum furnace；16- pulse laser；17- infrared detector；18- temperature measurer.
Specific embodiment
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention
In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is
A part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art
Every other embodiment obtained without creative efforts, shall fall within the protection scope of the present invention.
As shown in Figure 1 and Figure 2, the specimen support structure includes: pallet 2, support cylinder 3, turntable 4, pedestal 7 and at least
One sample cell 1；
At least one described sample cell 1 is fixedly mounted on pallet 2, and the installation place of each sample cell 1 opens up on pallet 2
There is the first loophole, the center of each first loophole is the first pre-determined distance at a distance from the center of pallet 2.The present embodiment
In, the first pre-determined distance can freely be set according to the actual situation, for example, the first pre-determined distance can be 10 centimetres.
Further, at least one sample cell 1 can circumference uniform distribution be mounted on the pallet 2, the quantity of sample cell 1 can be with
It is 4, is divided into 90 ° between the angle of two neighboring sample cell 1.
It is placed on each sample cell 1 at sample to be tested 10 and is provided with the second loophole；The center of each second loophole
With second loophole below the first loophole center on the same line；
The pallet 2 is fixedly mounted on 3 top of support cylinder, and the bottom of the support cylinder 3 is fixedly mounted on institute
On the bearing for stating turntable 4, the turntable 4 is fixedly connected with the pedestal 7, is provided with third loophole on the pedestal 7, this
The center of three loopholes is first pre-determined distance at a distance from first position on the pedestal 7；Wherein, the first position
Are as follows: the position on pedestal 7 described in the center face of the pallet 2.
In the present embodiment, turntable 4 can be controlled by matched control cabinet, and 360 ° of freedom may be implemented in the bearing of turntable 4
Rotation, support cylinder 3 can rotate together with the bearing of the turntable 4, so that being fixed on the pallet 2 of support cylinder 3 in
Heart rotation, each sample cell 1 being fixed on pallet 2 are rotated around center.In addition, due to the third loophole being arranged on pedestal 7
With at a distance from first position, the center of each first loophole be the first pre-determined distance at a distance from the center of pallet 2, then have
On the same line, therefore, laser can pass sequentially through third light transmission for the center of third loophole and the center of the first loophole
Hole, the first loophole, the second loophole are beaten on sample 10.
Multiple sample cells 1 are provided on pallet 2, each sample cell 1 can be different sizes, for being pre-placed difference
The sample to be tested 10 of size.After the thermal diffusivity of a sample to be tested 10 is measured, staff can rotate support
Disk 2 is aligned the second loophole of other sample cells 1 with third loophole, to measure test sample to be checked in the sample cell again
The thermal diffusivity of product 10.
Using existing specimen support structure, in the measurement process for carrying out thermal diffusivity to multiple samples to be tested, need
Ceaselessly to replace sample；And apply the sample branch in laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention
Support structure places sample to be tested in each sample cell 1 in advance, by Rotary tray 2, it can be achieved that each sample to be tested
Thermal diffusivity measurement, to improve the measurement efficiency of thermal diffusivity.
Sample holder 8 and the size of locking cap 9 are designed according to sample size and shape, fixable sample to be tested 10
Diameter range be Φ 5mm~Φ 55mm, thickness range (0.5~10) mm can also fix rectangular, oval, triangle
Chip sample.
As shown in figure 3, each sample cell 1 includes: sample holder 8 and locking cap 9；
It is provided with the slot surrounded by protrusion in sample holder 8, second loophole is equipped at the center of the slot, it is described
The size that the size of second loophole is greater than sample to be tested 10 can prevent to be detected after sample to be tested is placed in slot
Sample is fallen；The locking cap 9 closely covers the protrusion of the slot surrounding, for fixing sample to be tested 10；The locking cap 9
Center offers the 4th loophole, passes through the temperature of 10 upper surface of the 4th light transmission hole measurement sample to be tested for infrared detector
Degree.Threaded hole is additionally provided on sample cell 1, sample cell 1 can be fixedly mounted on pallet 2 by the threaded hole.
As shown in Figure 1 and Figure 4, the specimen support structure further includes protective shield of radiation 5；The protective shield of radiation 5 is located at described
Inside support cylinder 3.
Specifically, the protective shield of radiation 5 includes: support rod 11, at least one radiation blade 12, at least one limit sleeve 13
With fixing sleeve 14；
Mounting hole is offered at the first position on the pedestal 7, the installation is inserted into the bottom end of the support rod 11
In hole, shown 11 upper bottom portion of support rod is provided with limit ear, and the size of the limit ear is greater than the mounting hole, prevents from supporting
Bar 11 is due to gravity fall.Further, the support rod 11 can be also mounted by means of bolts on the pedestal 7.
The support rod 11 is two-part structure, and the support rod 11 is thin segment on last stage, the support rod 11
Next stage is thick section；
At least one radiation blade 12 is arranged on the thin segment of the support rod 11, the centre bore of each radiation blade 12
Diameter is less than the outer diameter of thick section, to prevent radiation fins piece 12 from falling；It is arranged with limit sleeve 13 between connected two radiation blades 12,
Top on thin segment is arranged with fixing sleeve 14, and the bottom of the fixing sleeve 14 closely abuts the radiation blade 12 at top, for solid
Fixed each radiation blade 12.
The 5th loophole, the center of each 5th loophole and the 5th loophole institute are offered on each radiation blade 12
Distance at radiation 12 center of blade is first pre-determined distance, and the laser pulse across third loophole can be by each
Then 5th loophole is radiated in sample to be tested 10 by the first loophole and the second loophole.In the present embodiment, radiation
The quantity of blade can be 4.
As shown in figure 5, offering at least one thermal hole in the support cylinder 3.Each thermal hole is uniformly distributed along the circumference
In support cylinder 3, thermal hole can protect turntable 4 from the damage of high temperature for reducing axial thermal conductivity leakage heat；Thermal hole
Quantity and size can be designed freely according to the actual situation.In the present embodiment, the quantity of thermal hole can be 4.
The embodiment of the invention also provides a kind of laser flash method device for measuring thermal diffusivity.Fig. 6 is the embodiment of the present invention
The structural schematic diagram of the laser flash method device for measuring thermal diffusivity of offer, described device include pulse laser 16 and sample branch
Support structure；
The Laser emission port face third loophole of the pulse laser 16, for emitting laser pulse, pulse swashs
The laser pulse that the Laser emission port of light device 16 issues successively passes through third loophole, each 5th loophole, the first light transmission
Hole and the second loophole, beat in sample to be tested 10, heat for sample to be tested 10.
Described device further includes vacuum furnace 15, and the support cylinder 3 is located in the burner hearth of the vacuum furnace 15,
Measurement process for the thermal diffusivity for sample 10 to be detected provides environment temperature, and staff can be adjusted according to measurement request
The temperature range of vacuum furnace 15.
Further, sample cell 1, pallet 2, support tube 3, protective shield of radiation 5 rapidoprint can model depending on the temperature
It encloses and is selected, for example, optional material has polytetrafluoroethylene (PTFE), quartz glass, corundum, graphite, aluminium, copper, stainless steel etc., it is minimum resistance to
- 200 DEG C, 3000 DEG C of highest heatproof of temperature.In addition, protective shield of radiation 5, which reduces the radiation of sample cell 1 and pallet 2 at high temperature, leaks heat, together
When protection turntable 4 and pedestal 7, radiation blade quantity design is different under different temperatures range, can design according to the actual situation.Separately
Outside, the thermal hole opened up on 3 side wall of support cylinder, can be according under different temperatures range, designing different the number of openings and ruler
Very little design.
Described device further includes temperature measurer 18 and temperature sensor 6；
Through-hole is offered at 2 center of pallet, support rod 11 is hollow tubular structure, is provided with temperature sensing in support rod 11
Device, the top of the temperature sensor is by the through-hole, and the temperature measurer 18 is electrically connected with the temperature sensor, for measuring
The temperature that temperature sensor 6 detects, for characterizing the temperature of ambient enviroment.In addition, can also be in installation spoke in support rod 11
Thermometric blackbody chamber is penetrated, the temperature for measuring blackbody chamber is used to characterize the temperature of ambient enviroment.
Described device further includes infrared detector 17, and infrared detector 17 can be with the 4th loophole of face, infrared detector
17 for detecting the surface temperature of sample to be tested by the 4th loophole, and measurement result is used to calculate the heat of sample to be tested 10
Diffusivity.
The course of work of the invention is:
Specimen support structure and vacuum furnace, pulse laser, infrared detector, temperature measurer composition laser flash method heat
Diffusivity measuring device.
According to the specimen support structure of measurement temperature selection suitable material, selected further according to tested thermal diffusivity sample size
Select suitably sized sample cell.Sample to be tested is lain in a horizontal plane in sample holder, center of circular hole is in, screws on fixation
Cap, then sample cell is fixed on pallet, support cylinder is fixed on turntable, turntable is fixed on the base for a long time, bottom
Seat is a part of device for measuring thermal diffusivity vacuum chamber.
After sample to be tested and specimen support structure are fixed, by the of radiation fins on piece each in specimen support structure
Five loopholes are aligned with third loophole respectively；Mobile vacuum heating furnace makes entire support construction on heating in vacuum bonnet, will be true
Empty heating furnace and vacuum chamber are evacuated, and open the temperature control equipment for controlling vacuum furnace, make vacuum furnace
Temperature is heated to measurement temperature, stablizes temperature in measurement temperature；Rotating table, make below sample to be tested first thoroughly
Unthreaded hole is aligned with third loophole, by the upper surface of the measurement window of infrared detector and sample to be tested to just, unbalanced pulse
Laser, makes pulse laser issue a pulsed light beam, which beats in the lower surface of sample to be tested, test sample to be checked
Product heat absorption heating, the temperature change of infrared detector measurement sample to be tested upper surface are led to using temperature measurer measurement standard temperature
It crosses software and the obtained data of measurement is handled to obtain thermal diffusivity with (specific calculating process is the prior art, herein no longer
It repeats).It is measured a sample to be tested, again rotating table, successively measures the thermal diffusivity of other samples to be tested.
Laser flash method device for measuring thermal diffusivity provided in an embodiment of the present invention, can be improved the thermal diffusion of multiple samples
The measurement efficiency of rate；Sample cell is designed to different sizes, can meet the isodiametric sample of Φ 5mm, Φ 10mm, Φ 15mm, Φ 20mm
Product are fixed, and can also be customized according to the size of sample；The quantity for the sample to be tested that pallet is placed is depending on the quantity of sample cell；
Specimen support structure material selects difference at different temperatures, and Applicable temperature range is -200 DEG C~3000 DEG C；Temperature sensor
Selection is different at different temperatures, can be platinum resistance, thermocouple and radiation thermometer；Use radiation temperature timing, pallet
Blackbody chamber can be designed at center, and blackbody chamber temperature is measured by support rod circular hole.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although
Present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: it still may be used
To modify the technical solutions described in the foregoing embodiments or equivalent replacement of some of the technical features；
And these are modified or replaceed, technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution spirit and
Range.
Claims (14)
1. the specimen support structure in a kind of laser flash method device for measuring thermal diffusivity, which is characterized in that the sample support
Structure includes: pallet, support cylinder, turntable, pedestal and at least one sample cell；
At least one described sample cell is fixedly mounted on pallet, and the installation place of each sample cell offers first thoroughly on pallet
Unthreaded hole, the center of each first loophole are the first pre-determined distance at a distance from the center of pallet；
It is placed on each sample cell at sample to be tested and is provided with the second loophole；The center of each second loophole and this second
The center of the first loophole of loophole lower section is on the same line；
The pallet is fixedly mounted at the top of the support cylinder, and the bottom of the support cylinder is fixedly mounted on the turntable
On bearing, the turntable is fixedly connected with the base, and third loophole is provided on the pedestal, in the third loophole
The heart is first pre-determined distance at a distance from first position on the pedestal；Wherein, the first position are as follows: the pallet
Position on pedestal described in the face of center.
2. specimen support structure according to claim 1, which is characterized in that each sample cell include: sample holder and
Locking cap；
It is provided in sample holder by the slot that surrounds of protrusion, is equipped with second loophole at the center of the slot, described second
The size of loophole is greater than the size of sample to be tested；The locking cap closely covers the protrusion of the slot surrounding, the locking cap
Center offer the 4th loophole.
3. specimen support structure according to claim 1, which is characterized in that at least one sample cell circumference uniform distribution peace
On the pallet.
4. specimen support structure according to claim 3, which is characterized in that the quantity of sample cell is 4.
5. specimen support structure according to claim 1, which is characterized in that the specimen support structure further includes radiation protection
Screen；The protective shield of radiation is located inside the support cylinder.
6. specimen support structure according to claim 5, which is characterized in that
The protective shield of radiation includes: support rod, at least one radiation blade, at least one limit sleeve and fixing sleeve；
Mounting hole is offered at first position on the base, the bottom end of the support rod is inserted into the mounting hole, institute
It states support rod upper bottom portion and is provided with limit ear, the size of the limit ear is greater than the mounting hole；
The support rod is two-part structure, and the support rod is on last stage thin segment, and the next stage of the support rod is
Thick section；
At least one radiation blade is arranged on the thin segment of the support rod, the diameter of the centre bore of each radiation blade is less than thick
The outer diameter of section；It is arranged with limit sleeve between connected two radiation blades, the top on thin segment is arranged with fixing sleeve, the fixing sleeve
Bottom closely abut top radiation blade；
Each radiation fins on piece offers the 5th loophole, radiates where the center of each 5th loophole and the 5th loophole
The distance of blade center is first pre-determined distance.
7. specimen support structure according to claim 6, which is characterized in that the support rod is fixedly mounted on the pedestal
On.
8. specimen support structure according to claim 6, which is characterized in that the quantity for radiating blade is 4.
9. specimen support structure according to claim 1, which is characterized in that offer at least one in the support cylinder
Thermal hole.
10. specimen support structure according to claim 9, which is characterized in that the quantity of thermal hole is 4.
11. a kind of laser flash method device for measuring thermal diffusivity, which is characterized in that described device includes pulse laser, such as weighs
Benefit requires the described in any item specimen support structures of 1-10；
Third loophole described in the Laser emission port face of the pulse laser.
12. device according to claim 11, which is characterized in that described device further includes vacuum furnace, the support
Cylinder is located in the burner hearth of the vacuum furnace.
13. device according to claim 11, which is characterized in that described device further includes infrared detector, described infrared
Detector is used to detect the surface temperature of sample to be tested by the 4th loophole.
14. device according to claim 11, which is characterized in that described device further includes temperature measurer and temperature sensor；
Through-hole is offered at tray center, the top of the temperature sensor passes through the through-hole, the temperature measurer and the temperature
Sensor electrical connection.
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| CN201711072100.5A CN107727686B (en) | 2017-11-03 | 2017-11-03 | Laser flash method device for measuring thermal diffusivity and specimen support structure |
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| CN201711072100.5A CN107727686B (en) | 2017-11-03 | 2017-11-03 | Laser flash method device for measuring thermal diffusivity and specimen support structure |
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| JPS5831542B2 (en) * | 1979-02-28 | 1983-07-06 | 京都大学長 | Liquid thermal conductivity measuring device |
| JP3079216B2 (en) * | 1996-02-19 | 2000-08-21 | 工業技術院長 | Specific heat capacity measurement method |
| JP4761547B2 (en) * | 2006-06-01 | 2011-08-31 | 株式会社超高温材料研究センター | Measurement method of thermal constant using laser flash method |
| CN101929968B (en) * | 2009-10-30 | 2012-07-18 | 中国计量科学研究院 | Device for measuring thermal diffusivity |
| CN104407011A (en) * | 2014-12-09 | 2015-03-11 | 中国科学院上海应用物理研究所 | Laser flash method-based thermal diffusion coefficient test device and method |
| CN107014862A (en) * | 2017-05-18 | 2017-08-04 | 哈尔滨工业大学 | The amendment flicker method measurement apparatus and measuring method of the hot physical property of fused salt material |
| CN107271479A (en) * | 2017-06-14 | 2017-10-20 | 天津城建大学 | Nano material heat performance testing device |
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