CN107764855A - A kind of thermal conductivity measurement method and device - Google Patents
A kind of thermal conductivity measurement method and device Download PDFInfo
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- CN107764855A CN107764855A CN201610681951.9A CN201610681951A CN107764855A CN 107764855 A CN107764855 A CN 107764855A CN 201610681951 A CN201610681951 A CN 201610681951A CN 107764855 A CN107764855 A CN 107764855A
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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
Abstract
The invention discloses a kind of thermal conductivity measurement method and device, this method comprises the following steps：The standard sample of thermal conductivity factor known to S1, one group of measurement reaches time difference needed for predetermined temperature difference in temperature-rise period, and the relation between time difference according to measured by one group of standard sample and corresponding thermal conductivity factor, builds time difference thermal conductivity factor standard curve；S2, measurement treat that test sample reaches the time difference needed for predetermined temperature difference in temperature-rise period, and according to the time difference thermal conductivity factor standard curve, the thermal conductivity factor of test sample is treated described in conversion；The standard sample is identical with the structure for treating test sample；Determine the standard sample and described treat that test sample reaches the mode of heating of the time difference needed for predetermined temperature difference and included：By the standard sample or treat that one end of test sample is heated by thermal source, and measure the standard sample or treat the temperature change of the other end of test sample.This method can quickly and low cost measure material and product thermal conductivity factor.
Description
Technical field
The present invention relates to Heat Conduction Material fields of measurement, in particular it relates to a kind of thermal conductivity measurement method and device.
Background technology
Heat Conduction Material/product is to be designed in recent years for the heat transfer requirement of equipment, excellent performance, reliable.They
It is adapted to various environment and requirement, has appropriate countermeasure to the Heat Conduction Problems being likely to occur, to the highly integrated of equipment, Yi Jichao
It is small it is ultra-thin provide strong help, the Heat Conduction Material/product is more and more applied in many products, improves production
The reliability of product.
Thermal conductivity factor is the important indicator for characterizing Heat Conduction Material/product heat conductivility height, in research Heat Conduction Material/product
Heat conductivility when, be generally required for measuring.The method of heat conducting coefficient measuring is mainly flicker method (GB T at present
22588-2008 flicker methods measure thermal diffusion coefficient or thermal conductivity factor), it is under the adiabatic environment of surrounding, is L's to thickness
Thin discs sample adds the electric current of a pulse as heating hot-fluid, and measures and change the temperature change relation of sample over time with true
Thermal diffusivity is determined, so as to calculate a kind of measuring method of material thermal conductivity.
This flicker method not only needs specific precision equipment, and test specimens size there are certain requirements, and generally requires brokenly
Bad product, locally it is sampled from product, sample preparation.However, when mass producing research and development, generally require to test many exemplars,
Now problems be present using the thermal conductivity factor of flicker method measurement exemplar：(1) independent sample preparation is required for for each exemplar, needed
Take a substantial amount of time and cost；(2) thermal conductivity factor measured by flicker method can only represent the thermal conductivity factor of test specimens, its
Heat conductivility assessment can not integrally be carried out to product.
The content of the invention
It is an object of the invention to provide a kind of thermal conductivity measurement method and device, with quick and low cost measurement
Go out the thermal conductivity factor of material/product.
To achieve these goals, the present invention provides a kind of thermal conductivity measurement method, and this method comprises the following steps：
The standard sample of thermal conductivity factor known to S1, one group of measurement reaches time difference needed for predetermined temperature difference in temperature-rise period, and according to
The relation between time difference and corresponding thermal conductivity factor measured by one group of standard sample, build time difference-thermal conductivity factor standard
Curve；S2, measurement treat that test sample reaches the time difference needed for predetermined temperature difference in temperature-rise period, and according to time difference-lead
Hot factor standard curve, the thermal conductivity factor of test sample is treated described in conversion；The standard sample is identical with the structure for treating test sample；Measure
The standard sample and described treat that test sample reaches the mode of heating of the time difference needed for predetermined temperature difference and included：By the standard sample or
Treat that one end of test sample is heated by thermal source, and measure the standard sample or treat the temperature change of the other end of test sample.
A kind of heat conductivity measuring device is additionally provided in the present invention, the device includes heater block, test specimens fixed part
Part and temperature measurement unit；The test specimens fixed component is used to fix test specimens；The heater block is described for heating
One end of test specimens；The temperature measurement unit is used for the temperature for testing the other end of the test specimens.
A kind of thermal conductivity measurement method and device of above-mentioned technical proposal of the present invention, adds by using one end to standard sample
Heat, the simple metering system of other end measurement temperature change, build time difference-thermal conductivity factor standard curve in advance；Further according to phase
Same measuring method, which is measured, treats test sample in temperature-rise period, reaches the time difference required during predetermined temperature difference；By compareing the time
Difference-thermal conductivity factor standard curve, it becomes possible to the thermal conductivity factor of test sample is treated described in conversion.This mode has the advantages that：
(1) it is relatively low for the structural requirement of test specimens, if treat test sample and standard sample be consistent can be realized as it is quick,
And the purpose of test sample thermal conductivity factor is treated in the acquisition of low cost；
(2) requirement for test equipment is low, and measurement cost is low, and data reappearance is good, suitable for large-scale production
Exemplar test in R＆D process；
(3) it is relatively low for the structural requirement of test specimens, the measurement of various complicated exemplars can be applied to；Moreover, this survey
Amount method can be directly tested exemplar prepared in large-scale production R＆D process, can obtain to the whole of product
The thermal conductivity factor that body heat conductivility is assessed.
Other features and advantages of the present invention will be described in detail in subsequent specific embodiment part.
Brief description of the drawings
Accompanying drawing is for providing a further understanding of the present invention, and a part for constitution instruction, with following tool
Body embodiment is used to explain the present invention together, but is not construed as limiting the invention.In the accompanying drawings：
Fig. 1 shows a kind of structure schematic diagram of heat conductivity measuring device according to embodiments of the present invention.
Description of reference numerals
The test specimens fixed component of 1 heater block 2
The electric meter of 3 thermocouple tester 31
The test specimens of 32 measurement terminal 4
Embodiment
The embodiment of the present invention is described in detail below in conjunction with accompanying drawing.It should be appreciated that this place is retouched
The embodiment stated is merely to illustrate and explain the present invention, and is not intended to limit the invention.
Material and product thermal conductivity factor are measured in order to quick and low cost, provides one kind in the present invention
Thermal conductivity measurement method, this method comprise the following steps：The standard sample of thermal conductivity factor is in temperature-rise period known to S1, one group of measurement
In reach time difference needed for predetermined temperature difference, and the time difference according to measured by one group of standard sample and corresponding thermal conductivity factor
Between relation, build time difference-thermal conductivity factor standard curve；S2, measurement treat that test sample reaches predetermined temperature in temperature-rise period
Difference required time difference, and according to the time difference-thermal conductivity factor standard curve, the thermal conductivity factor of test sample is treated described in conversion；Institute
It is identical with the structure for treating test sample to state standard sample；Determine the standard sample and described treat that test sample reaches needed for predetermined temperature difference
The mode of heating of time difference includes：By the standard sample or treat that one end of test sample is heated by thermal source, and measure the standard sample
Or treat the temperature change of the other end of test sample.
The standard sample heated by thermal source in practical operation and described when the test sample so that the standard sample is to be measured
The relative distance and contact area of sample and the thermal source are consistent, to reduce the error of measured thermal conductivity factor.
The above method provided by the present invention by using the heating one end to standard sample, other end measurement temperature it is simple
Metering system, time difference-thermal conductivity factor standard curve is built in advance；Measured further according to identical measuring method and treat that test sample is heating up
During, reach the time difference required during predetermined temperature difference；By compareing time difference-thermal conductivity factor standard curve, it becomes possible to change
The thermal conductivity factor of test sample is treated described in calculation.This mode is relatively low for the structural requirement of test specimens, as long as treating that test sample is protected with standard sample
Hold the consistent purpose that can be realized as quick and low cost acquisition and treat test sample thermal conductivity factor.This method is for test equipment
Requirement it is low, measurement cost is low, and data reappearance is good, suitable for large-scale production R＆D process exemplar test；Together
When, in view of this method is relatively low for the structural requirement of test specimens, the measurement of various complicated exemplars can be applied to；Moreover, this
Kind measuring method can be directly tested exemplar prepared in large-scale production R＆D process, can be obtained to product
The thermal conductivity factor that overall thermal conductivity can be assessed.
The operation principle of the above method provided by the present invention is described below：
It is well known that the calculation formula of heat is Q/t=λ A (T2-T1)/L, Q is heat in formula, and t is the time difference, and λ is to lead
Hot coefficient, A are the cross-sectional area of test test specimens, and (T2-T1) is temperature difference, and L is the length of test test specimens.In heat, survey
In the case that sample structure and temperature difference are fixed, that is, Q, A in above-mentioned formula, (T2-T1) and the fixed situations of L
Under, above-mentioned formula can be adjusted to QL/A (T2-T1)=λ t, now, it is apparent that thermal conductivity factor (λ) and time difference (t)
Between negative correlativing relation is presented.
Based on this, the present inventor is proposed in control heat, test spline structure and temperature difference identical situation
Under, first the standard sample of thermal conductivity factor known to measurement reaches the time difference of predetermined temperature difference, and builds time difference-thermal conductivity factor standard
Curve, the time difference for treating that test sample reaches predetermined temperature difference is then measured again, and according to constructed time difference-thermal conductivity factor standard
Curve, the technical scheme of the thermal conductivity factor of test sample is treated described in conversion.
According to the present invention the above method, as long as standard sample is identical with the structure for treating test sample and test condition is identical,
Do not have particular/special requirement for wherein used thermal source, this thermal source both can be to directly heat thermal source or indirectly heat heat
Source, wherein directly heating thermal source includes but is not limited to electrical heating, ultraviolet heating, infrared heating, electric hot plate heating and heated by gas
Any of；Wherein indirect heat source includes but is not limited to any of liquid bath heating kettle and heating element heating.
In order to reduce process costs, and damage of the reduction heating to test specimens in the present invention, preferably described thermal source is that liquid (water) is bathed
Heating kettle, in practical operation, by the standard sample or treat that one end of test sample is extended to inside the liquid (water) bath heating kettle
Heating medium (water) in heated.
According to the above method of the present invention, as long as keeping standard sample identical with the predetermined temperature difference in test sample temperature-rise period is treated
, wherein not having particular/special requirement for the temperature of thermal source.In order to reduce cost, simplify and search, it is in the preferred case, described
Thermal source is constant temperature thermal source, and the heating-up temperature of the thermal source is 40-90 DEG C, preferably 50-60 DEG C.This heating-up temperature is particularly suitable
In liquid bath heating kettle, when using liquid bath heating kettle, standard sample and treat that test sample programming rate is relative and relax, easily metering temperature
Degree change, and then be easy to build time difference-thermal conductivity factor standard curve, and the corresponding thermal conductivity factor of conversion.
According to the above method of the present invention, as long as keeping standard sample identical with the predetermined temperature difference in test sample temperature-rise period is treated
, the occurrence of wherein predetermined temperature difference does not have particular/special requirement, such as the predetermined temperature difference can be 1-8 DEG C；It is preferred that institute
Predetermined temperature difference is stated as 2-4 DEG C.
It is in the preferred case, described in order to reduce the error of measured thermal conductivity factor according to the above method of the present invention
Measurement is repeated several times for same test specimens in the time difference that standard sample or the test specimens reach predetermined temperature difference under the same conditions
The average value of resulting time difference, the average value of the time difference obtained by preferably same 2-5 duplicate measurements of test specimens.
According to the above method of the present invention, do not have for the quantity of the standard sample of thermal conductivity factor known to one group in step S1
Particular/special requirement ,-thermal conductivity factor standard curve as long as there are two standard samples, can be constructed the time difference.However, consider
The accuracy of time cost and constructed standard curve, the standard of thermal conductivity factor known to one group in preferably described step S1
Sample includes the different standard sample of 2-10 thermal conductivity factor, more preferably including the different standard sample of 2-5 thermal conductivity factor.
Meanwhile a kind of heat conductivity measuring device is additionally provided in the present invention, as shown in figure 1, the device includes heating
Part 1, test specimens fixed component 2 and temperature measurement unit；The test specimens fixed component 2 is used to fix test specimens 4；It is described
Heater block 1 is used for the one end for heating the test specimens 4；The temperature measurement unit is used to test the another of the test specimens 4
The temperature at end.
This apparatus structure provided by the present invention is simple, and equipment cost is low, is easily assembled to safeguard, only passes through existing device
Combination can be formed.This device is in practical operation, it is only necessary to is carried out according to the above-mentioned thermal conductivity measurement method of the present invention
Operation, you can converse the thermal conductivity factor of respective material/product.
According to said apparatus of the present invention, do not have particular requirement for heater block 1 therein, wait to measure and monitor the growth of standing timber as long as not destroying
Material/product, it can directly heat part or indirectly heat part；Specific heater block is referred to
The conventional selection of existing mode of heating.In the present invention, in order to simplify apparatus structure, preferably described heater block 1 is liquid bath
Heating kettle.
According to said apparatus of the present invention, as long as including above-mentioned parts, and can be surveyed in the case of test specimens heating one end
The temperature change of the amount other end can be realized as the purpose of the present invention.For the temperature survey employed in test specimens temperature-rise period
Part does not require.Under preferable case, as shown in figure 1, the temperature measurement unit is thermocouple measurement instrument 3, the thermoelectricity
Even measuring instrument 3 includes electric meter 31 and the measurement terminal 32 that is connected with the electric meter 31, the measurement terminal 32 with
The other end of test specimens 4 is fixedly connected, to sense the temperature change of the other end of test specimens 4.Wherein electric meter
31 can show the real time temperature of the other end of test specimens 4, and be able to record the relevant temperature change corresponding time difference.
The thermocouple assay instrument 3 uses existing commercial instruments.
According to said apparatus of the present invention, do not have particular/special requirement for the structure of test specimens fixed component 2 therein, as long as
Test specimens can be fixed.It is described such as it can include firm banking and the supporting support being connected on the base
Supporting support includes the vertical rack vertically extended, and horizontally extending horizontal stand；The vertical branch
Frame is fixedly connected on the firm banking, and the horizontal stand is movably coupled on the fixed support, the test
Sample 4 is fixed on side of the horizontal stand away from the vertical rack.Under this configuration, can be by adjusting firm banking
Relative position between heater block, and relative position between horizontal stand and vertical rack with adjust test specimens 4 with
The relative position of heater block 1.
Below with reference to specific embodiment, thermal conductivity measurement method of the present invention and thermal conductivity measurement are further illustrated
The beneficial effect of device.
Involved heat conductivity measuring device structure is as shown in figure 1, concrete structure is described as follows in the following example：
The device includes heater block 1, test specimens fixed component 2, thermocouple tester 3；Wherein described heater block 1 is
Heating water bath pot；The thermocouple tester 3 includes electric meter 31 and the measurement terminal being connected on the electric meter 31
32, the heating water bath is inserted in one end that test specimens 4 are fixed by the test specimens fixed component 2 and vertically extended
In pot；The measurement terminal 32 of the thermocouple tester 3 is fixed with the other end of the test specimens 4 away from heating water bath pot and contacted
To measure the relevant temperature of the other end, and measured temperature value is fed back in the electric meter 31.
The test foundation of involved flicker method is in the following example《GB T 22588-2008 flicker methods measurement heat
Diffusion coefficient or thermal conductivity factor》.
Involved standard sample and treat that test sample is as follows in the following example：
Standard sample 1：Material is day light aluminium alloy trade mark DX19, and die casting is prepared as a height of 3 × 12.5 × 100mm of length and width square
Shape sample, the thermal conductivity factor measured through flicker method is 140w/mk；
Standard sample 2：Material is day light aluminium alloy trade mark DX26, and die casting is prepared as a height of 3 × 12.5 × 100mm of length and width square
Shape sample, the thermal conductivity factor measured through flicker method is 180w/mk；
Embodiment 1 to 3
(1) preparation of test sample is treated：
From fine aluminium, pure magnesium, intermediate alloy Al-50wt%Cu, Al-20wt%Si, Al-10wt%Mn adopt as raw material
Prepared respectively with the alloy cast ingot of component and content in table 1 with conventional aluminum alloys ingot casting smelting process, then pass through pressure casting method
The rectangle for preparing a height of 3 × 12.5 × 100mm of length and width treats test sample 1-3.
Table 1.
| Treat test sample | Al (wt%) | Si (wt%) | Cu (wt%) | Mg (wt%) | Mn (wt%) |
| 1 | Surplus | 9 | 0.5 | 0.5 | \ |
| 2 | Surplus | 8 | \ | 0.5 | \ |
| 3 | Surplus | 11 | 1 | 0.5 | 0.5 |
(2) construction method of " time difference-thermal conductivity factor standard curve " is as follows：
Water temperature in water-bath heating kettle in foregoing heat conductivity measuring device is heated to 50 DEG C, standard sample is then passed through into survey
Sample fixed component is fixed, the fixed position for making one end of standard sample extend in the heating water bath pot；From the one of standard sample
End, which is placed in heating water bath pot, begins to timing, records the time that the standard sample other end reaches corresponding at 25 DEG C and 29 DEG C.
Test specimens are removed after the completion of test, cooled down, then repeatedly abovementioned steps, the measurement standard sample other end reaches 25 DEG C and 29 again
DEG C when corresponding time, and be reported in Table 2 below.
Table 2.
From data in table 2, under 50 DEG C of constant thermals source of water temperature, standard sample 1 is by 25 DEG C of time differences for rising to 29 DEG C
Average value is 112s, and standard sample 2 is 77s by the 25 DEG C of time difference for rising to 29 DEG C average values；Now, with standard sample 1 and standard
The time difference of sample 2 is abscissa, and thermal conductivity factor is ordinate, you can it is (straight to construct corresponding standard curve in a coordinate system
Line), the linear equation in two unknowns formula of the standard curve (straight line) is y=kx+b, numerical value (the i.e. heat conduction wherein corresponding to y ordinates
Coefficient), x is the numerical value (i.e. time difference) corresponding to abscissa, and k is the slope of straight line, and b is x-axis intercept.Understood through conversion, it is preceding
It is -1.14, b 267.68 to state k in equation, i.e. the linear equation in two unknowns formula of the standard curve (straight line) is y=-1.14x+
267.68。
(3) method of testing of test specimens is as follows：
Using with identical test process in " time difference-thermal conductivity factor standard curve " building process in step (2),
The time difference corresponding when the test sample 1-3 other ends reach 25 DEG C and 29 DEG C is measured respectively, and is reported in Table 3 below；And by basis
(value is according to four by the foregoing corresponding thermal conductivity factor A for treating test sample 1-3 of " time difference-thermal conductivity factor standard curve " conversion constructed
The regular round numbers that house five enters), it is reported in Table 3 below；The thermal conductivity factor B calculated according to flicker method is reported in Table 3 below simultaneously, made
For control.
Table 3.
| Test specimens | Treat test sample 1 | Treat test sample 2 | Treat test sample 3 |
| 25 DEG C averagely time-consuming (s) | 25 | 22 | 30 |
| 29 DEG C averagely time-consuming (s) | 126 | 109 | 151 |
| Time difference average value (s) | 101 | 87 | 121 |
| Thermal conductivity factor A (w/mk) | 153 | 169 | 130 |
| Thermal conductivity factor B (w/mk) | 151 | 167 | 128 |
Embodiment 4 to 6
(1) preparation of test sample is treated：With reference to embodiment 1-3, the rectangle for preparing a height of 3 × 12.5 × 100mm of length and width treats test sample
4-6, wherein respectively treating that the component of test sample and content are as shown in table 4.
Table 4.
| Treat test sample | Al (wt%) | Si (wt%) | Cu (wt%) | Mg (wt%) | Mn (wt%) |
| 4 | Surplus | 7 | \ | 0.5 | \ |
| 5 | Surplus | 10 | 1 | \ | \ |
| 6 | Surplus | 11 | 2 | 0.5 | 0.2 |
(2) construction method of " time difference-thermal conductivity factor standard curve " is as follows：
Water temperature in water-bath heating kettle in foregoing heat conductivity measuring device is heated to 60 DEG C, standard sample is then passed through into survey
Sample fixed component is fixed, so that the fixed position that its one end is extended in the heating water bath pot；Put from one end of standard sample
Timing is begun in heating water bath pot, records the time that the standard sample other end reaches corresponding at 25 DEG C and 29 DEG C.Test
After the completion of test specimens are removed, cool down, then repeatedly abovementioned steps, when the measurement standard sample other end reaches 25 DEG C and 29 DEG C again
The corresponding time, and be reported in Table 5 below.
Table 5.
From data in table 5, under 60 DEG C of constant thermals source of water temperature, standard sample 1 is by 25 DEG C of time differences for rising to 29 DEG C
Average value is 96s, and standard sample 2 is 65s by the 25 DEG C of time difference for rising to 29 DEG C average values；Now, with standard sample 1 and standard sample
2 time difference is abscissa, and thermal conductivity factor is ordinate, you can corresponding standard curve (straight line) is constructed in a coordinate system,
The linear equation in two unknowns formula of the standard curve (straight line) is y=kx+b, numerical value (the i.e. heat conduction system wherein corresponding to y ordinates
Number), x is the numerical value (i.e. time difference) corresponding to abscissa, and k is the slope of straight line, and b is x-axis intercept.Understood through conversion, it is foregoing
K is -1.29, b 263.84 in equation, i.e. the linear equation in two unknowns formula of the standard curve (straight line) is y=-1.29x+
263.84。
(3) method of testing of test specimens is as follows：
Using with identical test process in " time difference-thermal conductivity factor standard curve " building process in step (2),
The time corresponding when the test sample 4-6 other ends reach 25 DEG C and 29 DEG C is measured respectively, and is reported in Table 6 below；And will be before
Stating the corresponding thermal conductivity factor A for treating test sample 4-6 of " time difference-thermal conductivity factor standard curve " conversion constructed, (value is according to four houses
The five regular round numbers entered), it is reported in Table 6 below；The thermal conductivity factor B calculated according to flicker method is reported in Table 6 below simultaneously, as
Control.
Table 6.
| Test specimens | Treat test sample 4 | Treat test sample 5 | Treat test sample 6 |
| 25 DEG C averagely time-consuming (s) | 17 | 21 | 19 |
| 29 DEG C averagely time-consuming (s) | 89 | 109 | 132 |
| Time difference average value (s) | 72 | 88 | 113 |
| Thermal conductivity factor A (w/mk) | 171 | 150 | 118 |
| Thermal conductivity factor B (w/mk) | 170 | 150 | 120 |
From the data in table 3 and table 6, according to the embodiment 1-6 of thermal conductivity measurement method provided by the present invention
Difference between measured thermal conductivity factor A, with the thermal conductivity factor B according to measured by existing flash of light is smaller, can be used in material
The heat conductivility of material/product is assessed.And material/product is measured according to thermal conductivity measurement method provided by the present invention
Thermal conductivity factor, also have the advantages that.
(1) it is relatively low for the structural requirement of test specimens, if treat test sample and standard sample be consistent can be realized as it is quick,
And the purpose of test sample thermal conductivity factor is treated in the acquisition of low cost；
(2) requirement for test equipment is low, and measurement cost is low, and data reappearance is good, suitable for large-scale production
Exemplar test in R＆D process；
(3) it is relatively low for the structural requirement of test specimens, the measurement of various complicated exemplars can be applied to；Moreover, this survey
Amount method can be directly tested exemplar prepared in large-scale production R＆D process, can obtain to the whole of product
The thermal conductivity factor that body heat conductivility is assessed.
The preferred embodiment of the present invention is described in detail above in association with accompanying drawing, still, the present invention is not limited to above-mentioned reality
The detail in mode is applied, in the range of the technology design of the present invention, a variety of letters can be carried out to technical scheme
Monotropic type, these simple variants belong to protection scope of the present invention.Such as.
It is further to note that each particular technique feature described in above-mentioned embodiment, in not lance
In the case of shield, it can be combined by any suitable means.In order to avoid unnecessary repetition, the present invention to it is various can
The combination of energy no longer separately illustrates.
In addition, various embodiments of the present invention can be combined randomly, as long as it is without prejudice to originally
The thought of invention, it should equally be considered as content disclosed in this invention.
Claims (10)
- A kind of 1. thermal conductivity measurement method, it is characterised in that the described method comprises the following steps：The standard sample of thermal conductivity factor known to S1, one group of measurement reaches the time difference needed for predetermined temperature difference in temperature-rise period, and The relation between time difference and corresponding thermal conductivity factor according to measured by one group of standard sample, build time difference-thermal conductivity factor Standard curve；S2, measurement treat that test sample reaches the time difference needed for predetermined temperature difference in temperature-rise period, and according to the time difference-heat conduction Factor standard curve, the thermal conductivity factor of test sample is treated described in conversion；The standard sample is identical with the structure for treating test sample；Determine the standard sample and described treat that test sample reaches predetermined temperature difference The mode of heating of required time difference includes：By the standard sample or treat that one end of test sample is heated by thermal source, and described in measurement Standard sample or treat test sample the other end temperature change.
- 2. thermal conductivity measurement method according to claim 1, wherein, the thermal source is to directly heat thermal source or add indirectly Thermal source.
- 3. thermal conductivity measurement method according to claim 2, wherein, the thermal source is liquid bath heating kettle, the mark Quasi- sample treats that one end of test sample is extended in the heating medium inside the liquid bath heating kettle.
- 4. thermal conductivity measurement method according to claim 1, wherein, the thermal source is constant temperature thermal source, the thermal source Heating-up temperature is 40-90 DEG C, preferably 50-60 DEG C.
- 5. thermal conductivity measurement method according to claim 1, wherein, the predetermined temperature difference is 1-8 DEG C；Preferably 2- 4℃。
- 6. thermal conductivity measurement method according to claim 1, wherein, the standard sample or the test specimens reach predetermined The time difference of temperature difference is that the average value for measuring the resulting time difference, preferably same test specimens are repeated several times in same test specimens The average value of time difference obtained by 2-5 duplicate measurements.
- 7. thermal conductivity measurement method as claimed in any of claims 1 to 6, wherein, one group in the step S1 The standard sample of known thermal conductivity factor includes the different standard sample of at least two thermal conductivity factors, preferably includes 2-10 thermal conductivity factor Different standard sample, more preferably including the different standard sample of 2-5 thermal conductivity factor.
- 8. a kind of heat conductivity measuring device, it is characterised in that described device includes heater block (1), test specimens fixed component And temperature measurement unit (2)；The test specimens fixed component (2) is used to fix test specimens (4)；The heater block (1) is used In the one end for heating the test specimens (4)；The temperature measurement unit is used for the temperature for testing the other end of the test specimens (4) Degree.
- 9. heat conductivity measuring device according to claim 8, wherein, the heater block (1) is liquid bath heating kettle.
- 10. heat conductivity measuring device according to claim 8, wherein, the temperature measurement unit is thermocouple measurement Instrument (3), the thermocouple measurement instrument (3) include electric meter (31) and the measurement terminal being connected with the electric meter (31) (32), the measurement terminal (32) is fixedly connected with the other end of test specimens (4).
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| CN108775971A (en) * | 2018-09-10 | 2018-11-09 | 中国科学院工程热物理研究所 | A kind of measurement method of temperature measuring equipment and specific heat capacity and thermal conductivity |
| CN110119595A (en) * | 2019-06-03 | 2019-08-13 | 广州致远新材料科技有限公司 | A kind of design method of die-cast aluminum alloy material |
| CN110274930A (en) * | 2019-06-24 | 2019-09-24 | 金华职业技术学院 | A kind of biological sample heat test device |
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| CN110119595A (en) * | 2019-06-03 | 2019-08-13 | 广州致远新材料科技有限公司 | A kind of design method of die-cast aluminum alloy material |
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| CN111474204A (en) * | 2020-04-28 | 2020-07-31 | 西安工业大学 | Method for testing heat conductivity coefficient of cylindrical sample by punching method |
| CN111474204B (en) * | 2020-04-28 | 2023-04-28 | 西安工业大学 | Method for testing heat conductivity coefficient of cylindrical sample by punching method |
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