CN108072680A - A kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus - Google Patents
A kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus Download PDFInfo
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- CN108072680A CN108072680A CN201810055443.9A CN201810055443A CN108072680A CN 108072680 A CN108072680 A CN 108072680A CN 201810055443 A CN201810055443 A CN 201810055443A CN 108072680 A CN108072680 A CN 108072680A
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- G01N25/00—Investigating or analyzing materials by the use of thermal means
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Abstract
The present invention relates to a kind of evaluating apparatus of heat conductivility, the particularly evaluating apparatus to heat conductivity of heat-conduction silicone grease.The evaluating apparatus includes the components such as radiating piece, heat generating member, insulation mold, temperature measuring set, is provided with cavity on the mold that insulate to accommodate measured material, insulation mold is between radiating piece and heat generating member.First temperature measuring point on heat generating member is set, the second temperature measuring point is set at the edge of radiating piece, the temperature of the first temperature measuring point and the second temperature measuring point is measured respectively using temperature measuring set so as to calculate the temperature difference, by the temperature difference come the heat conductivility of Indirect evaluation measured material.The heat conductivility evaluating apparatus of the present invention has the features such as device is simple, and operation is convenient, and practicability is higher, suitable for being promoted the use of in laboratory.
Description
Technical field
The present invention relates to a kind of evaluating apparatus of heat conductivility, the particularly evaluating apparatus to heat conductivity of heat-conduction silicone grease.
Background technology
It is directed to the evaluation of the heat conductivility of Heat Conduction Material on the market at present, is mostly directly to measure thermal conductivity factor.Pass through ratio
Compared with the size of thermal conductivity factor, its heat conductivility is evaluated.Wherein thermal conductivity factor refers under the conditions of steady heat transfer, 1m thickness
Material.The temperature difference of both side surface is 1k, in 1s, passes through the heat of 1 square metre of area transmission, unit w/m.K.To heat conduction system
Several measuring methods mainly has heat-flow meter method, Guarded hot plate, pipe method, heat-pole method, flicker method.There is phase for various methods
Corresponding measuring instrument.These measuring instruments all have equipment costliness, and test condition is harsh, the numerous rope of operating procedure, the testing time
The features such as long.
In real work, especially in the R＆D process of heat conductive silicon grease material, there are many required test sample.If make
With conventional method, by measuring thermal conductivity factor, compare the size of thermal conductivity factor, then reflect the Different Effects factor influence it is big
It is small；The influence curve of some independent factor is either found out, generally requires substantial amounts of energy and testing time or substantial amounts of people
Power and equipment.
Therefore, the evaluating apparatus for designing heat conductivility that is a kind of simple and practical and can reflecting test sample just seems particularly heavy
It will.
The content of the invention
For above-mentioned technical problem existing in the prior art, the present invention provides a kind of use for laboratory heat-conducting silicone grease thermal conductivity
Energy evaluating apparatus is compared indirectly by the size of real time monitoring or the temperature and the temperature difference of radiating piece temperature of timing monitoring pyrotoxin
Relatively go out the heat conductivility of test sample.
To achieve the above object, the present invention provides following technical scheme：
The present invention provides a kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus, including radiating piece, heat generating member, insulation
Mold, temperature measuring set, radiating piece are cylindrical shape, and several length have along the circumferential direction been evenly spaced on the body of radiating piece
The radiating fin of strip, the length direction of each radiating fin are identical with the axial direction of cylinder；It is provided on the top of radiating piece
Circular top plate, insulation mold are fixed on the middle part of circular top plate, and the middle part for the mold that insulate has the cavity through insulation mold；Hair
Warmware is arranged on the surface of insulation mold；First temperature measuring point on heat generating member is set, is set at the circular top plate edge of radiating piece
The second temperature measuring point is put, measures the temperature of the first temperature measuring point and the second temperature measuring point respectively using temperature measuring set.
Preferably, the cavity to insulate on mold is circular cavity, the center of circular cavity, the center of heat generating member and cylinder
The center of body shape radiating piece is on the same line.In this way, be conducive to the heat conductivility of accurate evaluation heat-conducting silicone grease.Meanwhile
It selects heat-insulating material that mold is made, reduces the heat transfer of mold side, the accuracy of test can be significantly improved.
Preferably, heat generating member is circular plate-like shape, and the circular cavity of insulation mold can be at least completely covered in size.
Preferably, heat generating member is composed for circular slab heat generating member and hemispherical heat generating member, and hemispherical heat generating member is located at circle
The centre of shape plate heat generating member one side, the opposite side of circular slab heat generating member contact with insulation mold and insulator die are at least completely covered
The circular cavity of tool.
Preferably, insulator die have plurality of specifications, can according to the difference of measured material reasonable selection.Thus, it is possible to
According to different measured materials, different molds is matched, so as to more intuitively evaluate thermal conductivity of material.
Preferably, the size of the circular top plate on radiating piece top is more than the size of the cavity of insulation mold；It is highly preferred that it dissipates
The radius of the circular top plate on warmware top is more than the radius of the circular cavity of insulation mold.
Preferably, the circular radius surrounded by radiating fin is identical with the radius of the circular top plate on radiating piece top.
From Fourier's law, heat output Q=- λ A (Δ t/L)；Heat flow density q=- λ (Δ t/L)；By simply becoming
Shape can obtain λ=- QL/ Δs tA.Wherein Q be heat conduction amount, unit W；λ is thermal conductivity factor；A is heat transfer area, unit m2；T is
Temperature, unit K；L is thickness on thermal conductive surface, unit m；Q is along the heat flow density transferred, unit W/m2。
Thermal conductivity factor is inversely proportional with the temperature difference it can be seen from formula λ=- Q L/ Δs tA.It therefore, can be by the size pair of the temperature difference
The heat conductivility of different test samples is evaluated.
The tool of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus evaluation heat conductivity of heat-conduction silicone grease using the present invention
Body step is as follows：
1) graphene additive amount is being carried out in the experiment of the influence of heat conductivity of heat-conduction silicone grease, first fixing insulation mold
Among radiating piece；
2) after the completion of sample making, take appropriate amount of sample that sample is uniformly scraped to the cavity for being applied to insulator die tool from one side
In；
3) heat generating member is positioned on insulation mold；
4) temperature sensor is connected on the first temperature measuring point of heat generating member, connecting temperature in the second temperature measuring point of radiating piece passes
Sensor；
5) 10 minutes are stood, opens temperature measuring set and start to measure the temperature of the first temperature measuring point and the second temperature measuring point, simultaneously
Heat generating member switch is opened, heat generating member is made to generate heat with firm power；
6) curve is changed over time by temperature measuring set record temperature；
7) after temperature stabilization, the temperature difference of the first temperature measuring point and the second temperature measuring point is calculated.
Thermal conductivity factor and the relation that temperature difference relation is inverse correlation due to measured material heat-conducting silicone grease, so as to according to temperature
The size of difference is evaluated come the heat conductivility to heat-conducting silicone grease.
Beneficial effects of the present invention：
The present invention provides a kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus, has device simple, operation facilitates
The features such as, practicability is higher.The size of the temperature difference within the regular hour by comparing different test samples can determine
Property just evaluates the heat conductivility of both samples.The insulation mold of the present invention could be provided as plurality of specifications, being capable of basis
The difference of measured material and match different molds, it is convenient and efficient, be applicable in wide.It selects heat-insulating material that mold is made, can effectively subtract
The heat transfer of few mold side, so as to substantially increase the accuracy of test.
Description of the drawings
Fig. 1 is use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus schematic diagram of the present invention；
Fig. 2 is the schematic diagram of insulation mold in the embodiment of the present invention；
Fig. 3 is the pictorial diagram of the use for laboratory heat-conducting silicone grease heat conduction evaluating apparatus in the embodiment of the present invention；
Fig. 4 is the pictorial diagram of the temperature measuring device used in the embodiment of the present invention；
Fig. 5 is the temperature difference with graphene additive amount variation diagram；
Fig. 6 is the additive amount of graphene and the relational graph of thermal conductivity factor.
Reference numeral：1st, the first temperature measuring point；2nd, the second temperature measuring point；3rd, heat generating member；4th, insulate mold；5th, radiating piece.
Specific embodiment
Below in conjunction with specific embodiment and attached drawing, the present invention is described in detail.
With reference to Fig. 1-2, the present invention provides a kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus, including radiating piece 5,
Heat generating member 3, insulation mold 4, temperature measuring set, radiating piece 5 is cylindrical shape, on the body of radiating piece 5 along the circumferential direction uniformly
The radiating fin of several strips is intervally distributed with, the length direction of each radiating fin is identical with the axial direction of cylinder；It is dissipating
The top of warmware 5 is provided with circular top plate, and insulation mold 4 is fixed on the middle part of circular top plate, and the middle part of insulation mold 4, which has, to be passed through
Wear the cavity of insulation mold 4；Heat generating member 3 is arranged on the surface of insulation mold 4；First temperature measuring point 1 is set on heat generating member 3,
Second temperature measuring point 2 is set at the circular top plate edge of radiating piece 5, measures the first temperature measuring point 1 and the respectively using temperature measuring set
The temperature of two temperature measuring points 2.
Preferably, the cavity to insulate on mold 4 is circular cavity, the center of circular cavity, the center of heat generating member 3 and circle
The center of bar shape radiating piece 5 is on the same line.In this way, be conducive to the heat conductivility of accurate evaluation heat-conducting silicone grease.Together
When, it selects heat-insulating material that mold is made, reduces the heat transfer of mold side, the accuracy of test can be significantly improved.
Preferably, heat generating member 3 is circular plate-like shape, and the circular cavity of insulation mold 4 can be at least completely covered in size.
Preferably, heat generating member 3 is composed for circular slab heat generating member 3 and hemispherical heat generating member 3, hemispherical heat generating member 3
Centre in 3 one side of circular slab heat generating member, the opposite side of circular slab heat generating member 3 are contacted with insulation mold 4 and at least covered completely
The circular cavity of lid insulation mold 4.
Preferably, insulate mold 4 there are many specification, can according to the difference of measured material reasonable selection.Thus, it is possible to
According to different measured materials, different molds is matched, so as to more intuitively evaluate thermal conductivity of material.
Preferably, the size of the circular top plate on 5 top of radiating piece is more than the size of the cavity of insulation mold 4；It is highly preferred that
The radius of the circular top plate on 5 top of radiating piece is more than the radius of the circular cavity of insulation mold 4.
Preferably, the circular radius surrounded by radiating fin is identical with the radius of the circular top plate on radiating piece top.
From Fourier's law, heat output Q=- λ A (Δ t/L)；Heat flow density q=- λ (Δ t/L)；By simply becoming
Shape can obtain λ=- Q L/ Δs tA.Wherein Q be heat conduction amount, unit W；λ is thermal conductivity factor；A is heat transfer area, unit m2；T is
Temperature, unit K；L is thickness on thermal conductive surface, unit m；Q is along the heat flow density transferred, unit W/m2。
Thermal conductivity factor is inversely proportional with the temperature difference it can be seen from formula λ=- Q L/ Δs tA.It therefore, can be by the size pair of the temperature difference
The heat conductivility of different test samples is evaluated.
Use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus using the present invention evaluates heat conductivity of heat-conduction silicone grease, specifically
Step is as follows：
1) graphene additive amount is being carried out in the experiment of the influence of heat conductivity of heat-conduction silicone grease, first consolidating insulation mold 4
It is scheduled among radiating piece 5；
2) after the completion of sample making, take appropriate amount of sample that sample is uniformly scraped to the cavity for being applied to insulator die tool 4 from one side
In；
3) heat generating member 3 is positioned on insulation mold 4；
4) temperature sensor is connected on the first temperature measuring point 1 of heat generating member 3, temperature is connected in the second temperature measuring point 2 of radiating piece 5
Spend sensor；
5) 10 minutes are stood, opens temperature measuring set and start to measure the temperature of the first temperature measuring point 1 and the second temperature measuring point 2, together
When open heat generating member 3 switch, heat generating member 3 is made to generate heat with firm power；
6) curve is changed over time by temperature measuring set record temperature；
7) after temperature stabilization, the temperature difference of the first temperature measuring point 1 and the second temperature measuring point 2 is calculated.
Thermal conductivity factor and the relation that temperature difference relation is inverse correlation due to measured material heat-conducting silicone grease, so as to according to temperature
The size of difference is evaluated come the heat conductivility to heat-conducting silicone grease.
Embodiment one：
Using above-mentioned evaluation method, different heat-conducting silicone greases is selected to be tested, experiment is as follows.
Four kinds of different heat-conducting silicone greases, experiment heat conductivity of heat-conduction silicone grease evaluating apparatus using the present invention are chosen respectively
It is tested.The heat-conducting silicone greases different to four kinds are numbered respectively, are respectively GS-01, GS-02, GS-03, GS-04.GS-01
Middle each group distribution ratio is heat-conducting silicone grease: graphene: silicone oil=1: 0.2: 2；Each group distribution ratio is heat-conducting silicone grease: graphite in GS-02
Alkene=150: 1.2；Each group distribution ratio is heat conductive silica gel: graphene=4: 0.02 in GS-03；GS-04 is pure heat-conducting silicone grease, is not added
Add graphene or silicone oil.Test data is as shown in table 1.
The test data of 1 four kinds of different heat-conducting silicone greases of table
The thermal conductivity factor testing result of four kinds of heat-conducting silicone greases is as shown in table 2：
Thermal conductivity factor and temperature difference relation just inverse correlation as can be known from Table 2.
Embodiment two：
It carries out influence of the graphene additive amount to heat conductivity of heat-conduction silicone grease to another heat-conducting silicone grease to study, with stone
Black alkene additive amount (unit %) is abscissa, and the temperature difference (unit is DEG C) is ordinate, draws the temperature difference and adds quantitative change with graphene
Change figure, as shown in Figure 5.
Accordingly, then to the thermal conductivity factor of these corresponding heat-conducting silicone greases for being with the addition of graphene measure, obtain stone
The additive amount of black alkene and the relation of thermal conductivity factor are as shown in Figure 6.
By comparison diagram 5,6, the thermal conductivity factor of heat-conducting silicone grease and the relation that temperature difference relation is inverse correlation, so as to
It is evaluated according to the size of the temperature difference come the heat conductivility to heat-conducting silicone grease.
Finally it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than the present invention is protected
The limitation of scope is protected, although being explained in detail with reference to preferred embodiment to the present invention, those of ordinary skill in the art should
Work as understanding, technical scheme can be modified or replaced equivalently, without departing from the reality of technical solution of the present invention
Matter and scope.
Claims (6)
1. a kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus, it is characterised in that：Including radiating piece, heat generating member, insulation
Mold, temperature measuring set, the radiating piece are cylindrical shape, are along the circumferential direction evenly spaced on the body of the radiating piece
There is the radiating fin of several strips, the length direction of each radiating fin is identical with the axial direction of cylindrical shape radiating piece；
Circular top plate is provided on the top of the radiating piece, the insulation mold is fixed on the middle part of the circular top plate, described exhausted
The middle part of edge mold has the cavity through insulation mold；The heat generating member is arranged on the surface of insulation mold；In the hair
First temperature measuring point on warmware is set, the second temperature measuring point is set at the circular top plate edge of the radiating piece, is surveyed using the temperature
Amount instrument measures the temperature of the first temperature measuring point and the second temperature measuring point respectively.
2. use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus as described in claim 1, it is characterised in that：The insulator die
Cavity on tool is circular cavity, the center at the center of the circular cavity, the center of heat generating member and cylindrical shape radiating piece
On the same line.
3. use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus as claimed in claim 2, it is characterised in that：The heat generating member
For circular plate-like shape, the circular cavity of insulation mold can be at least completely covered in size.
4. use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus as claimed in claim 2, it is characterised in that：The heat generating member
It is composed of circular slab heat generating member and hemispherical heat generating member, the hemispherical heat generating member is located at the circular slab heat generating member one side
Centre, the opposite side of the circular slab heat generating member with it is described insulation mold contact and be at least completely covered insulate mold circle
Shape cavity.
5. use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus as described in claim 1, it is characterised in that：The insulator die
With plurality of specifications, the reasonable selection according to the difference of measured material.
6. use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus as described in claim 1, it is characterised in that：By radiating fin
The circular radius surrounded is identical with the radius of the circular top plate on radiating piece top.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810055443.9A CN108072680A (en) | 2018-01-19 | 2018-01-19 | A kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus |
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| CN201810055443.9A CN108072680A (en) | 2018-01-19 | 2018-01-19 | A kind of use for laboratory heat conductivity of heat-conduction silicone grease evaluating apparatus |
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Cited By (3)
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| CN115248170A (en) * | 2022-09-21 | 2022-10-28 | 中国电子产品可靠性与环境试验研究所（（工业和信息化部电子第五研究所）（中国赛宝实验室）） | Performance detection method of thermal interface material of organic silicon system |
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