CN106645277A - Tester for testing fiber axial heat conduction performance and production method thereof - Google Patents
Tester for testing fiber axial heat conduction performance and production method thereof Download PDFInfo
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- CN106645277A CN106645277A CN201610916455.7A CN201610916455A CN106645277A CN 106645277 A CN106645277 A CN 106645277A CN 201610916455 A CN201610916455 A CN 201610916455A CN 106645277 A CN106645277 A CN 106645277A
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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
The invention provides a tester for testing fiber axial heat conduction performance. The tester comprises a clamp and a to-be-tested fiber contained in the clamp, wherein the clamp is of a hollow straight cylinder shape. The tester has the advantages that the filamentous fiber can be tightly fixed and allowed to have good straightness, and the tester can be well used for testing the fiber axial heat conduction performance. According to embodiment records, the tester is successfully used in laser flash analyzer detection, and the detected heat conduction coefficients of samples are respectively 156W/m.K, 0.7W/m.K and 52W/m.K.
Description
Technical field
The present invention relates to fiber heat conductivility detection technique field, more particularly to a kind of fiber axis that is used for is to heat conductivility survey
Test specimen of examination and preparation method thereof.
Background technology
Fiber has been widely used in every field as a kind of composite material reinforcement body with excellent properties.
The high power of electronic device, highly integrated development it is also proposed higher requirement, accurate table to the heat dispersion of composite
Levying the thermal conductivity factor of fibre reinforcement becomes the basis of design high-heat-conductive composite material.
At present, the method for determining thermal conductivity is varied with instrument, and these methods are broadly divided into two classes：Steady state method and non-steady
State method (dynamic method).Limit according to described by Fourier equation, steady state method mainly have heat-flow meter method, protection hot plate method and
Protection heat flow method etc..For steady state measurement method, it can directly and accurately determine the thermal conductivity of material, and principle is simply easy
Understand and its measurement temperature scope is big, but comparatively minute length, test request are harsh, are generally applied to thermal conductivity low
Testing of materials.Cold store enclosure mainly shines method etc. including heat-pole method, Hot-strip Method and laser, and it is more applied to high heat conductance
The measurement of material, with the features such as Range of measuring temp width, high test accuracy and simple sample preparation.
1961, Parker WJ et al. proposed first laser and shine the concept of method, i.e., by laser pulse technology to material
The hot property of material is tested, and have developed the experimental facilities that can be used for testing.At present, the method has become the world
On one of the most ripe method of test material heat conductivility, obtained the generally accreditation of international ermal physics educational circles.Laser shines
The characteristics of method test material heat conductivility has many excellent：First, required specimen size is tested less, material-saving and appearance
Easily prepare；Secondly, the thermal conductivity factor scope that it can be tested is 0.1～2000, is covered including liquid, film, composite
And motlten metal is in interior various materials；In addition, the method test speed is very fast, for the thermal conductivity test for singly shining a little is only needed
3～5min；Most of all, used as contactless and non-demolition formula measuring method, its certainty of measurement is also higher.
However, the method sample is generally isotropism bulk material, for the several microns of filament diameter, and with each
For the fibrous material of anisotropy feature, difficulty of test is larger.
The content of the invention
It is an object of the invention to provide a kind of test specimen for fiber axis guide thermal performance test and preparation method thereof, this
The test specimen that invention is provided can be directly used for the test of fiber heat conductivility.
The invention provides a kind of test specimen for fiber axis guide thermal performance test, including clamper and it is contained in clamping
Fiber to be measured inside device；
The clamper is in hollow straight circular cylinder type.
Preferably, the material of the clamper is polyvinyl chloride, polyethylene, polypropylene, polybutene, polybenzimidazoles or third
Alkene nitrile-BS.
Preferably, the wall thickness of the clamper is 0.5～2mm, and length is 1～6mm, and internal diameter is 10～15mm.
Preferably, the opening parallel to hollow straight cylinder axis is provided with the cylindrical wall of the clamper.
Preferably, the fiber to be measured is placed in preprocessing solution for raw fibre carries out soaking the pretreatment fibre for obtaining
Dimension.
Preferably, the preprocessing solution is absolute ethyl alcohol or acetone；
The time of the immersion is 15～20 minutes.
Preferably, the fibers parallel to be measured is distributed in the axis of hollow straight cylinder, the two ends of fiber to be measured respectively with folder
Two end faces of holder are generally aligned in the same plane.
Preferably, volumetric filling ratio of the fiber to be measured inside clamper is 50～70%.
Present invention also offers a kind of preparation method of the above-mentioned test specimen for fiber axis guide thermal performance test, including such as
Lower step：
There is provided three clampers, and make three clampers axis be same straight line；
By fiber architecture to be measured and through the inside of three clampers；
The clamper at two ends is carried out into drawing-off to two ends outside respectively；
The fiber at middle clamper two ends is cut, a test specimen is obtained.
Present invention also offers a kind of above-mentioned test specimen according to laser shine method test application of the fiber axis to heat conductivility.
The invention provides a kind of test specimen for fiber axis guide thermal performance test, including clamper and it is contained in clamping
Fiber to be measured inside device；The clamper is in hollow straight circular cylinder type.The test specimen that the application is provided, can be by the thread fiber of length
Closely fixed, and caused that good collimation is had by fixed fiber, can be good at for fiber axis guide
In the middle of the test of hot property.It can be seen from the record of embodiment, the test specimen that the application is obtained successfully is used for laser and shines method
Detection in, detection obtains the thermal conductivity factor of sample and is respectively 156W/mK, 0.7W/mK and 52W/mK.
Description of the drawings
Fig. 1 is the structural representation of clamper described in the embodiment of the present invention 1；
Fig. 2 is the filling step schematic diagram of the fiber of the embodiment of the present invention 1；
Fig. 3 is the view of the testing sample before the embodiment of the present invention 1 is cut and after cutting；
Fig. 4 is 500 times of enlarged drawings of metallographic of the test specimen of the embodiment of the present invention 1；
Fig. 5 is 500 times of enlarged drawings of SEM of the test specimen of the embodiment of the present invention 1；
Fig. 6 is the top view in kind of the test specimen of the embodiment of the present invention 1；
Wherein, 1- closes the clamper of closed state, the clamper of 2- deployed conditions, 3- fibers to be measured.
Specific embodiment
The invention provides a kind of test specimen for fiber axis guide thermal performance test, including clamper and it is contained in clamping
Fiber to be measured inside device；
The clamper is in hollow straight circular cylinder type.
Include clamper provided by the present invention for the test specimen of fiber axis guide thermal performance test, the clamper is in hollow
Straight circular cylinder type.In the present invention, the material of the clamper is preferably polyvinyl chloride, polyethylene, polypropylene, polybutene, polyphenyl
And imidazoles or acrylonitrile-butadiene-styrene copolymer.In the present invention, the thermal conductivity factor of the clamper material is preferred
Less than or equal to 1W/mK.In the specific embodiment of the invention, the present invention selects corresponding material according to the test temperature of fiber to be measured
The clamper of matter, it is ensured that heat distortion temperature of the test temperature less than clamper material.
In the present invention, the wall thickness of the clamper is preferably 0.5～2mm, more preferably 0.8～1.8mm, most preferably
1～1.5mm；The length of the clamper is preferably 1～6mm, most preferably more preferably 2～5mm, 3～4mm；The clamping
The internal diameter of device is preferably 10～15mm, most preferably more preferably 11～14mm, 12～13mm.
In the present invention, it is preferably provided with being parallel to the opening of hollow straight cylinder axis on the cylindrical wall of the clamper,
In order to the filling of fiber to be measured.In the present invention, the length of the opening is preferably equal to the length of clamper.
As shown in figure 1, Fig. 1 is the structural representation of clamper in one embodiment of the invention, the clamper is in hollow straight
Cylindric, both ends open is provided with opening parallel to hollow straight cylinder axis and isometric with clamper on cylindrical wall.
Treating inside clamper is also contained in provided by the present invention for the test specimen of fiber axis guide thermal performance test
Survey fiber.The present invention does not have any particular/special requirement to the species of the fiber to be measured, however, it would be possible to for the fiber of any kind,
Specific such as carbon fiber, glass fibre, basalt fibre, polyethylene fibre, silicon carbide fibre and aluminum fiber.
In the present invention, the fiber to be measured is preferably raw fibre and is placed in preprocessing solution and carries out soaking obtain pre-
Process fiber.In the present invention, the preprocessing solution is preferably absolute ethyl alcohol or acetone；The time of the immersion is preferably 15
～20 minutes, can be specifically 15 minutes, 16 minutes, 17 minutes, 18 minutes, 19 minutes or 20 minutes.In the present invention, institute
State immersion treatment enable to fiber alignment it is more neat, without twisting, while avoid fiber bifurcated, fluffing and rupture, pre- place
The collection of filaments after reason is more preferable.
In the present invention, the fiber to be measured is preferably parallel to the axis distribution of hollow straight cylinder, the two ends of fiber to be measured
It is generally aligned in the same plane with two end faces of clamper respectively.In the present invention, due to the presence of error in practical operation, the folder
The depth of parallelism between two end faces of holder allows the presence of certain error, and the angle between both ends of the surface is preferably less than equal to 5 °,
3 ° are more preferably less than equal to, most preferably less than equal to 1 °.
In the present invention, volumetric filling ratio of the fiber to be measured inside clamper is preferably 50～70%, more preferably
For 55～65%, most preferably 58～62%.
In the present invention, the volumetric filling ratio is preferably controlled by following steps：
Collection of filaments volumetric filling ratio is calculated
First, the cross-sectional area of a branch of carbon fiber is calculated according to formula 1.1：
L is carbon fiber length in formula 1.1；The a branch of carbon fiber quality of this section of m；ρ is carbon fiber density；
Clamper cross-sectional area is calculated further according to formula 1.2：
D is clamper internal diameter in formula 1.2.
Fibre bundle radical according to needed for formula 1.3 calculates setting fiber volume filling rate：
V in formula 1.31It is the fiber volume filling rate of setting；
In a particular embodiment, if carbon fiber is with beam as minimum filling unit, will be calculated according to formula 1.3
Fibre bundle radical n is rounded as n1, further according to formula 1.4 fiber volume filling rate actual in fiber holder is calculated：
Present invention also offers a kind of preparation method of the above-mentioned test specimen for fiber axis guide thermal performance test, including such as
Lower step：
There is provided three clampers, and make three clampers axis be same straight line；
By fiber architecture to be measured and through the inside of three clampers；
The clamper at two ends is carried out into drawing-off to two ends outside respectively；
The fiber at middle clamper two ends is cut, a test specimen is obtained.
The present invention provide three clampers, and make three clampers axis be same straight line.In the present invention, it is described
Three clampers are spaced a distance.
The present invention is by fiber architecture to be measured and through the inside of three clampers.In the present invention, if the clamper
For opening clamper, fiber to be measured is preferably loaded into the inside of clamper from the opening of clamper by the present invention；The dress
After filling out end, present invention preferably uses adhesive tape or other adhesive means are bonded to the opening of the clamper.At this
In invention, if the clamper is not opening clamper, the present invention preferably connects out fiber to be measured separately from one end of clamper
One end.
The clamper at two ends is carried out drawing-off by the present invention to two ends outside respectively, to ensure fiber collimation arrangement to be measured.Institute
After stating drawing-off, the present invention cuts to the fiber at middle clamper two ends, obtains a test specimen.In the present invention, due to
Two clampers in left and right only aid in drawing-off, and its collimation may be without the good of centre, therefore the application is not used the clamping at two ends
Device is preparing sample；However, when the collimation to sample requires relatively low, can be while the fiber at the clamper two ends to two ends
Cut, so can simultaneously be obtained three test specimens.It is currently preferred so that the length of fiber in the cutting process
It is longer than the length of clamper, makes clamper two ends have the fiber of excess enthalpy, the fiber of excess enthalpy is carried out at grinding and polishing in order to after
Reason, it is ensured that the flatness in test specimen two ends face.In the present invention, the length of the excess enthalpy is preferably 1～2mm, more preferably 1.2～
1.8mm, most preferably 1.4～1.6mm.
In the present invention, the grinding and polishing is preferably the sand paper being incremented by using fineness and sample two ends is polished；The sand
Paper is preferably 60～3000 mesh fineness and is incremented by, and more preferably 100～2800 mesh fineness are incremented by, and most preferably 500～2500 mesh are thin
Degree is incremented by.The present invention does not have any particular/special requirement to the variable that the sand paper fineness is incremented by, and can carry out according to arbitrary variable
It is incremented by, the end face of sample can be polishing to by observation by light microscope to clearly single fiber.In the present invention,
The incremental variable is preferably 100～1000 mesh, most preferably more preferably 200～800 mesh, 300～500 mesh.
The invention provides a kind of test specimen for fiber axis guide thermal performance test, including clamper and it is contained in clamping
Fiber to be measured inside device；The clamper is in hollow straight circular cylinder type.The test specimen that the application is provided, can be by the thread fiber of length
Closely fixed, and caused that good collimation is had by fixed fiber, can be good at for fiber axis guide
In the middle of the test of hot property.It can be seen from the record of embodiment, the test specimen that the application is obtained successfully is used for laser and shines method
Detection in, detection obtains the thermal conductivity factor of sample and is respectively 156W/mK, 0.7W/mK and 52W/mK.
With reference to embodiment to the test specimen provided by the present invention for fiber axis guide thermal performance test and its preparation side
Method is described in detail, but they can not be interpreted as limiting the scope of the present invention.
In the following embodiments, raw material is commercial goods.
Embodiment 1
The first step：Collection of filaments volumetric filling ratio is calculated
This example adopts the carbon fiber of model M40J, and fiber volume density is 1.81g/cm3, cross-section fibers beam number is 808
Beam, it is 68% to calculate fiber volume filling rate through formula 1.1～1.4.
Second step：It is prepared by carbon fiber clamper
Specimen holder selects polyvinyl chloride pipe, and it is 1mm that internal diameter is 12mm, wall thickness 2mm, length, the parallel clamping in its side
Device axis is cut open.
As shown in figure 1, as shown in Figure 1, the clamper is in hollow for the structural representation of clamper described in the present embodiment
Straight circular cylinder type, is provided with the opening parallel to hollow straight cylinder axis on cylindrical wall.
3rd step：Fiber is loaded
It is the neat segment of fiber of 8cm length by continuous fiber tow cut growth degree, segment of fiber is immersed in absolute ethyl alcohol, leaching
Take out after bubble 20min, marshalling, and guarantee fiber without twisting, while avoiding fiber bifurcated from fluffing and rupture.By three sections of fibres
Dimension clamper proper alignment, it is ensured that axis point-blank, by the collection of filaments of marshalling from lint retainer side
It is loaded at opening in pipe.Three sections of clamper side hatching lines are bondd successively closure using adhesive tape.Two are clamped using box spanner
End lint retainer, axially applies pulling force to two ends, it is ensured that fiber collimation arrangement.
In the present embodiment fiber filling step schematic diagram as shown in Fig. 2 in Fig. 21 for close closed state clamper, 2 are
The clamper of deployed condition, 3 is fiber to be measured.
4th step：Sample cuts and grinding and polishing
The fiber on median fiber clamper both sides is cut successively using scalpel, then using 60 mesh to 3000 mesh sand paper according to
It is secondary to be polished, till specimen surface is smooth and smooth.Then collection of filaments sample two sides is exchanged, so 2-4 repeatedly
It is secondary, until specimen surface can pass through optical fiber sem observation to clearly single fiber, while ensure that upper and lower surface is parallel, up and down
Surface angle is not more than 5 °.Aforesaid operations are carried out, sample grinding and polishing is thick to 1mm, obtain the final heat conduction sample for preparing.
The view of the testing sample before cutting in the present embodiment and after cutting is as shown in figure 3, left-half in Fig. 3
Before cutting, after latter half is for cutting.
500 times of enlarged drawings of the metallographic of test specimen in the present embodiment are as shown in figure 4,500 times of enlarged drawings of SEM are as shown in figure 5, reality
Thing top view is as shown in Figure 6.From Fig. 4～6, the fiber to be measured in the test specimen that the present embodiment is obtained can be neat parallel to
The axis close-packed arrays of clamper, are combined the requirement of sample to be tested.
Using two-dimentional steady flow of heat parallel model heat conduction formula ke=∑ikiφiCan be calculated, volumetric filling ratio is 68%
M40J carbon fiber guiding heat examination sample Jing laser shine method determine after test result be 52W/mK.
Embodiment 2
The first step：Collection of filaments volumetric filling ratio is calculated
This example adopts the glass fibre of model EC5.5-1212S110, and fiber filament diameter is 5.5 μm, and density is
12tex, cross-section fibers beam number is 523 beams, and it is 50% to calculate fiber volume filling rate through formula 1.1～1.4.
Second step：It is prepared by carbon fiber clamper
From resistant to elevated temperatures polybenzimidazoles (PBI) plastic tube as lint retainer, wall thickness 5mm, internal diameter be 15mm, length
Spend and cut open for 4mm, its side parallel gripper axis.
3rd step：Fiber is loaded
It is the neat segment of fiber of 8cm length by continuous fiber tow cut growth degree, segment of fiber is immersed in absolute ethyl alcohol, leaching
Take out after bubble 20min, marshalling, and guarantee fiber without twisting, while avoiding fiber bifurcated from fluffing and rupture.By three sections of fibres
Dimension clamper proper alignment, it is ensured that axis point-blank, by the collection of filaments of marshalling from lint retainer side
It is loaded at opening in pipe.Three sections of clamper side hatching lines are bondd successively closure using adhesive tape.Two are clamped using box spanner
End lint retainer, axially applies pulling force to two ends, it is ensured that fiber collimation arrangement.
4th step：Sample cuts and grinding and polishing
The fiber on median fiber clamper both sides is cut successively using scalpel, then using 60 mesh to 3000 mesh sand paper according to
It is secondary to be polished, till specimen surface is smooth and smooth.Then collection of filaments sample two sides is exchanged, so 2-4 repeatedly
It is secondary, until specimen surface can pass through optical fiber sem observation to clearly single fiber, while ensure that upper and lower surface is parallel, up and down
Surface angle is not more than 5 °.Aforesaid operations are carried out, sample grinding and polishing is thick to 3mm, obtain the final heat conduction sample for preparing.
Using two-dimentional steady flow of heat parallel model heat conduction formula ke=∑ikiφiCan be calculated, volumetric filling ratio is 50%
EC5.5-1212S110 type glass fibre thermal conductivity factor 0.7W/mK.
Embodiment 3
The first step：Collection of filaments volumetric filling ratio is calculated
This example adopt the trade mark of Yixing City permanent mould Co., Ltd production for 1060 metal aluminum fiber, fibre diameter
For 11.5 μm, single-stranded fiber beam is 4000, and cross-section fibers beam number is 163 beams, and through formula 1.1～1.4 fiber volume is calculated
Filling rate is 60%.
Second step：It is prepared by carbon fiber clamper
Specimen holder selects polyethylene pipe, internal diameter be 12mm, wall thickness 1.5mm, length be 6mm, length be 7mm, its side
Face parallel gripper axis is cut open.
3rd step：Fiber is loaded
It is the neat segment of fiber of 8cm length by continuous fiber tow cut growth degree, segment of fiber is immersed in absolute ethyl alcohol, leaching
Take out after bubble 18min, marshalling, and guarantee fiber without twisting, while avoiding fiber bifurcated from fluffing and rupture.By three sections of fibres
Dimension clamper proper alignment, it is ensured that axis point-blank, by the collection of filaments of marshalling from lint retainer side
It is loaded at opening in pipe.Three sections of clamper side hatching lines are bondd successively closure using adhesive tape.Two are clamped using box spanner
End lint retainer, axially applies pulling force to two ends, it is ensured that fiber collimation arrangement.
4th step：Sample cuts and grinding and polishing
The fiber on median fiber clamper both sides is cut successively using scalpel.To prevent during grinding and polishing fiber from clamper one
End skids off, and is prepared for corresponding grinding and polishing instrument.Using the polyvinyl chloride for solidifying E51 epoxy resin in pipe identical with clamper external diameter
Pipe is used as grinding and polishing instrument.
Resin matrix is irrigated in the collection of filaments.First sample is placed in into 50 DEG C of drying 3h in electric heating constant-temperature blowing drying box,
Make solvent volatilization complete.From epoxy resin E51 and triethylene tetramine as resin system, epoxy resin is controlled with curing agent
Addition is 100：10,20g epoxy resin E51 and 2g triethylene tetramines are weighed, it is sufficiently stirred in beaker.By the tree for mixing
Fat is poured in conduction model from heat conduction sample top, is placed under 25 DEG C of room temperature environments and is solidified 12h.Because the resin system is
Normal temperature cure system, solidifies without the need for sample is put in vacuum drying oven.
The heat conduction sample of completion of cure and grinding and polishing auxiliary tube are fixed together using adhesive tape, note keeping between contact surface
It is parallel and seamless, then polished successively to 3000 mesh sand paper using 60 mesh, till specimen surface is smooth and smooth.
Then collection of filaments sample two sides is exchanged, so repeatedly 2-4 time, until specimen surface can be by optical fiber sem observation to clearly
Clear single fiber, while ensureing that upper and lower surface is parallel, upper and lower surface angle is not more than 5 °.Aforesaid operations are carried out, sample is ground
Throw thick to 6mm, obtain the final heat conduction sample for preparing.
Using two-dimentional steady flow of heat parallel model heat conduction formula ke=∑ikiφiCan be calculated, volumetric filling ratio is 60%
Aluminum fiber thermal conductivity factor be 156W/mK.
It is able to know that according to above example, the invention provides a kind of examination for fiber axis guide thermal performance test
Part, including clamper and the fiber to be measured being contained in inside clamper；The clamper is in hollow straight circular cylinder type.The application is provided
Test specimen, can the thread fiber of length closely be fixed, and cause that good collimation is had by fixed fiber,
Can be good at for fiber axis in the middle of the test of heat conductivility.It can be seen from the record of embodiment, the examination that the application is obtained
Part be successfully used for laser shine method detection in, detection obtains the thermal conductivity factor of sample and is respectively 156W/mK, 0.7W/
MK and 52W/mK.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, under the premise without departing from the principles of the invention, some improvements and modifications can also be made, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of test specimen for fiber axis guide thermal performance test, including clamper and the fibre to be measured being contained in inside clamper
Dimension；
The clamper is in hollow straight circular cylinder type.
2. the test specimen for fiber axis guide thermal performance test according to claim 1, it is characterised in that the clamper
Material be polyvinyl chloride, polyethylene, polypropylene, polybutene, polybenzimidazoles or acrylonitrile-butadiene-styrene copolymer.
3. the test specimen for fiber axis guide thermal performance test according to claim 1 and 2, it is characterised in that the folder
The wall thickness of holder is 0.5～2mm, and length is 1～6mm, and internal diameter is 10～15mm.
4. the test specimen for fiber axis guide thermal performance test according to claim 1 and 2, it is characterised in that the folder
The opening parallel to hollow straight cylinder axis is provided with the cylindrical wall of holder.
5. the test specimen for fiber axis guide thermal performance test according to claim 1, it is characterised in that the fibre to be measured
Tie up to be placed in preprocessing solution for raw fibre and carry out soaking the pretreatment of fiber for obtaining.
6. the test specimen for fiber axis guide thermal performance test according to claim 5, it is characterised in that the pretreatment
Solution is absolute ethyl alcohol or acetone；
The time of the immersion is 15～20 minutes.
7. the test specimen for fiber axis guide thermal performance test according to claim 5 or 6, it is characterised in that described to treat
The axis that fibers parallel is surveyed in hollow straight cylinder is distributed, and the two ends of fiber to be measured are respectively with the two of clamper end faces positioned at same
Plane.
8. the test specimen for fiber axis guide thermal performance test according to claim 5 or 6, it is characterised in that described to treat
It is 50～70% to survey volumetric filling ratio of the fiber inside clamper.
9. the preparation method of the test specimen of fiber axis guide thermal performance test is used for described in claim 1～8 any one, including such as
Lower step：
There is provided three clampers, and make three clampers axis be same straight line；
By fiber architecture to be measured and through the inside of three clampers；
By after the gripper at two ends respectively to two ends outside carry out drawing-off；
The fiber at middle clamper two ends is cut, a test specimen is obtained.
10. test specimen described in claim 1～8 any one according to laser shine method test application of the fiber axis to heat conductivility.
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