CN106645277B - A kind of test specimen and preparation method thereof for fiber axis guide thermal performance test - Google Patents
A kind of test specimen and preparation method thereof for fiber axis guide thermal performance test Download PDFInfo
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Abstract
The present invention provides a kind of test specimens for fiber axis guide thermal performance test, including clamper and the fiber to be measured being contained in inside clamper；The clamper is in hollow straight circular cylinder type.Long Filamentous fiber can closely be fixed, and make fixed fiber with good collimation by test specimen provided by the present application, can be good at for fiber axis in the test of heating conduction.It is according to the embodiment record it is found that the test specimen that the application obtains successfully be used for laser shine method detection in, to obtain the thermal coefficient of sample be respectively 156W/mK, 0.7W/mK and 52W/mK for detection.
Description
Technical field
The present invention relates to fiber heating conduction detection technique fields, more particularly to a kind of fiber axis that is used for survey to heating conduction
Test specimen of examination and preparation method thereof.
Background technique
Fiber has been widely used in every field as a kind of composite material reinforcement body with excellent properties.
Higher requirements are also raised for the heat dissipation performance of the high power of electronic device, highly integrated development to composite material, accurate table
The thermal coefficient for levying fibre reinforcement becomes the basis of design high-heat-conductive composite material.
Currently, the method and instrument of measurement thermal conductivity are varied, these methods are broadly divided into two classes: steady state method and it is non-surely
State method (dynamic method).The limit according to described in Fourier equation, steady state method mainly have heat-flow meter method, protection hot plate method and
Protect heat flow method etc..For steady state measurement method, it can directly and accurately measure the thermal conductivity of material, and principle is simply easy
Understand and its measurement temperature range is big, but in contrast minute is long, test request is harsh, and it is low to be usually applied to thermal conductivity
Testing of materials.Cold store enclosure mainly includes that heat-pole method, Hot-strip Method and laser shine method etc., it is more applied to high heat conductance
The measurement of material has the characteristics that Range of measuring temp is wide, test accuracy is high and sample preparation is simple.
1961, Parker WJ et al. was put forward for the first time laser and has shone the concept of method, i.e., by laser pulse technology to material
The hot of material can be carried out test, and have developed the experimental facilities that can be used for testing.Currently, this method has become the world
On most mature test material heating conduction one of method, obtained the generally approval of international ermal physics educational circles.Laser shines
Method test material heating conduction has the characteristics that many excellent: firstly, specimen size required by testing is smaller, saving material and appearance
Easily preparation；Secondly, its thermal coefficient range that can be tested is 0.1~2000, cover including liquid, film, composite material
And a variety of materials including molten metal；In addition, this method test speed is very fast, the thermal conductivity test singly to shine a little is only needed
3~5min；Most of all, as contactless and non-demolition formula measurement method, measurement accuracy is also higher.
However, this method sample is generally isotropism bulk material, microns several for filament diameter, and have each
For the fibrous material of anisotropy feature, difficulty of test is larger.
Summary of the invention
The purpose of the present invention is to provide a kind of test specimens and preparation method thereof for fiber axis guide thermal performance test, originally
The test specimen that invention provides can be directly used for the test of fiber heating conduction.
The present 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-butadiene-styrene copolymer.
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 for being parallel to hollow straight cylinder axis is set on the cylindrical wall of the clamper.
Preferably, the fiber to be measured is that raw fibre is placed in the pretreatment fibre impregnated in preprocessing solution
Dimension.
Preferably, the preprocessing solution is dehydrated alcohol or acetone；
The time of the immersion is 15~20 minutes.
Preferably, the fibers parallel to be measured in hollow straight cylinder axis be distributed, the both 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%.
The present invention also provides a kind of preparation methods of above-mentioned test specimen for fiber axis guide thermal performance test, including such as
Lower step:
Three clampers are provided, and make the same straight line of the axis of three clampers；
By fiber architecture to be measured and through the inside of three clampers；
By the clamper at both ends respectively to progress drawing-off on the outside of both ends；
The fiber at intermediate clamper both ends is cut, a test specimen is obtained.
The present invention also provides a kind of above-mentioned test specimen according to laser shine method test application of the fiber axis to heating conduction.
The present 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.Test specimen provided by the present application, can be by long Filamentous fiber
It is closely fixed, and makes fixed fiber that there is good collimation, can be good at for fiber axis guide
In the test of hot property.It is according to the embodiment to record it is found that the test specimen that the application obtains successfully is used for laser shines method
Detection in, to obtain the thermal coefficient of sample be respectively 156W/mK, 0.7W/mK and 52W/mK for detection.
Detailed description of the invention
Fig. 1 is the structural schematic diagram of clamper described in the embodiment of the present invention 1；
Fig. 2 is the filling step schematic diagram of 1 fiber of the embodiment of the present invention；
Fig. 3 is the status diagram of the sample to be tested before the embodiment of the present invention 1 is cut and after cutting；
Fig. 4 is 500 times of enlarged drawings of metallographic of 1 test specimen of the embodiment of the present invention；
Fig. 5 is 500 times of enlarged drawings of SEM of 1 test specimen of the embodiment of the present invention；
Fig. 6 is the top view in kind of 1 test specimen of the embodiment of the present invention；
Wherein, 1- closes the clamper of closed state, the clamper of 2- unfolded state, 3- fiber to be measured.
Specific embodiment
The present 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.
Test specimen provided by the present invention for fiber axis guide thermal performance test includes clamper, and 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 coefficient of the clamper material is preferred
Be 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 guarantees that test temperature is lower than the heat distortion temperature of 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, more preferably 2~5mm, most preferably 3~4mm；The clamping
The internal diameter of device is preferably 10~15mm, more preferably 11~14mm, most preferably 12~13mm.
In the present invention, it is preferably provided with the opening for being parallel to 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 FIG. 1, FIG. 1 is the structural schematic diagram of clamper in one embodiment of the invention, the clamper is in hollow straight
Cylindric, both ends open, setting is parallel to hollow straight cylinder axis and the opening isometric with clamper on cylindrical wall.
Test specimen provided by the present invention for fiber axis guide thermal performance test further include be contained in inside clamper to
Survey fiber.The present invention does not have any particular/special requirement to the type of the fiber to be measured, however, it would be possible to and it is 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 be preferably raw fibre be placed in impregnated in preprocessing solution it is pre-
Handle fiber.In the present invention, the preprocessing solution is preferably dehydrated alcohol or acetone；The time of the immersion is preferably 15
~20 minutes, specifically can be 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 avoiding fiber bifurcated, fluffing and fracture, it is pre- to locate
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 both ends of fiber to be measured
It is generally aligned in the same plane respectively with two end faces of clamper.In the present invention, due to the presence of error in practical operation, the folder
There is a certain error for depth of parallelism permission between two end faces of holder, and the angle between both ends of the surface is preferably less than equal to 5 °,
More preferably less than it is equal to 3 °, is 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
It is 55~65%, most preferably 58~62%.
In the present invention, the volumetric filling ratio preferably passes through following steps and is controlled:
Collection of filaments volumetric filling ratio calculates
Firstly, calculating the cross-sectional area of a branch of carbon fiber 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 needed for calculating setting fiber volume filling rate according to formula 1.3:
V in formula 1.31It is the fiber volume filling rate of setting；
In a particular embodiment, if carbon fiber is with beam for minimum filling unit, by what is be calculated according to formula 1.3
It is n that fibre bundle radical n, which is rounded,1, actual fiber volume filling rate in fiber holder is calculated further according to formula 1.4:
The present invention also provides a kind of preparation methods of above-mentioned test specimen for fiber axis guide thermal performance test, including such as
Lower step:
Three clampers are provided, and make the same straight line of the axis of three clampers；
By fiber architecture to be measured and through the inside of three clampers；
By the clamper at both ends respectively to progress drawing-off on the outside of both ends；
The fiber at intermediate clamper both ends is cut, a test specimen is obtained.
The present invention provides three clampers, and makes the same straight line of the axis of three clampers.In the present invention, 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 the clamper that is open, fiber to be measured is preferably loaded into the inside of clamper by the present invention from the opening of clamper；The dress
It fills out after end, present invention preferably uses adhesive tapes or other adhesive means to bond 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 present invention respectively to progress drawing-off on the outside of both ends, arranges the clamper at both ends to guarantee that fiber to be measured collimates.Institute
After stating drawing-off, the present invention cuts the fiber at intermediate clamper both ends, obtains a test specimen.In the present invention, due to
Two clampers in left and right only assist drawing-off, and what collimation may be not intermediate is good, therefore the clamping at both ends is not used in the application
Device prepares sample；However, when the collimation to sample requires lower, fiber that can simultaneously to the clamper both ends at both ends
It is cut, three test specimens can be obtained simultaneously in this way.In the cutting process, the currently preferred length for making fiber
It is longer than the length of clamper, making clamper both ends has the fiber of excess enthalpy, in order to which the fiber later to excess enthalpy carries out at grinding and polishing
Reason guarantees 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 that the sand paper for using fineness incremental polishes to sample both ends；The sand
Paper is preferably that 60~3000 mesh fineness are 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 variable that the present invention is incremented by the sand paper fineness does not have any particular/special requirement, can carry out according to arbitrary variable
It is incremented by, the end face of sample can be polishing to and clearly single fiber is observed by optical microscopy.In the present invention,
The incremental variable is preferably 100~1000 mesh, more preferably 200~800 mesh, most preferably 300~500 mesh.
The present 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.Test specimen provided by the present application, can be by long Filamentous fiber
It is closely fixed, and makes fixed fiber that there is good collimation, can be good at for fiber axis guide
In the test of hot property.It is according to the embodiment to record it is found that the test specimen that the application obtains successfully is used for laser shines method
Detection in, to obtain the thermal coefficient of sample be respectively 156W/mK, 0.7W/mK and 52W/mK for detection.
Below with reference to embodiment to provided by the present invention for fiber axis guide thermal performance test test specimen and its preparation side
Method is described in detail, but they cannot be interpreted as limiting the scope of the present invention.
In the following embodiments, raw material is commercial goods.
Embodiment 1
Step 1: collection of filaments volumetric filling ratio calculates
This example uses the carbon fiber of model M40J, and fiber volume density is 1.81g/cm3, cross-section fibers beam number is 808
Beam, calculating fiber volume filling rate by formula 1.1~1.4 is 68%.
Step 2: prepared by carbon fiber clamper
Specimen holder selects polyvinyl chloride pipe, and internal diameter 12mm, wall thickness 2mm, length 1mm, side clamps in parallel
Device axis is splitted.
The structural schematic diagram of clamper described in the present embodiment is as shown in Figure 1, as shown in Figure 1, the clamper is in hollow
Straight circular cylinder type, setting is parallel to the opening of hollow straight cylinder axis on cylindrical wall.
Step 3: fiber loads
The neat segment of fiber for being 8cm long by continuous fiber tow cut growth degree immerses segment of fiber in dehydrated alcohol, leaching
Bubble 20min after take out, marshalling, and ensure fiber without twisting, while avoid fiber bifurcated fluff and fracture.By three sections of fibres
Clamper proper alignment is tieed up, guarantees axis point-blank, by the collection of filaments of marshalling from lint retainer side
Opening is loaded into pipe.Three sections of clamper side hatching lines are successively bonded into closure using adhesive tape.Utilize box spanner clamping two
Lint retainer is held, axially applies pulling force to both ends, guarantees fiber collimation arrangement.
In the present embodiment fiber filling step schematic diagram as shown in Fig. 2, in Fig. 21 be close closed state clamper, 2 are
The clamper of unfolded state, 3 be fiber to be measured.
Step 4: sample cutting and grinding and polishing
The fiber on median fiber clamper both sides is successively cut using scalpel, then using 60 mesh to 3000 mesh sand paper according to
It is secondary to polish, until smooth and smooth until specimen surface.Then collection of filaments sample two sides is exchanged, repeatedly 2-4
It is secondary, until specimen surface can be by optical fiber sem observation to clearly single fiber, while guaranteeing that upper and lower surface is parallel, up and down
Surface angle is not more than 5 °.Aforesaid operations are carried out, by sample grinding and polishing to 1mm thickness, obtain the thermally conductive sample finally prepared.
The status diagram of sample to be tested before cutting in the present embodiment and after cutting is as shown in figure 3, left-half in Fig. 3
Before cutting, latter half is after cutting.
500 times of enlarged drawings of the metallographic of test specimen in the present embodiment as shown in figure 4,500 times of enlarged drawings of SEM as shown in figure 5, reality
Object top view is as shown in Figure 6.By Fig. 4~6 it is found that the fiber to be measured in the test specimen that the present embodiment obtains neat can be parallel to
The axis close-packed arrays of clamper, the requirement of compound sample to be tested.
Utilize the thermally conductive formula k of two-dimentional steady flow of heat parallel modele=∑ikiφiIt can be calculated, volumetric filling ratio 68%
M40J carbon fiber guiding heat examination sample through laser shine method measurement after test result be 52W/mK.
Embodiment 2
Step 1: collection of filaments volumetric filling ratio calculates
This example uses 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 are 523 beams, and calculating fiber volume filling rate by formula 1.1~1.4 is 50%.
Step 2: prepared by carbon fiber clamper
Select polybenzimidazoles resistant to high temperature (PBI) plastic tube as lint retainer, wall thickness 5mm, internal diameter 15mm, length
Degree is 4mm, its side parallel gripper axis is splitted.
Step 3: fiber loads
The neat segment of fiber for being 8cm long by continuous fiber tow cut growth degree immerses segment of fiber in dehydrated alcohol, leaching
Bubble 20min after take out, marshalling, and ensure fiber without twisting, while avoid fiber bifurcated fluff and fracture.By three sections of fibres
Clamper proper alignment is tieed up, guarantees axis point-blank, by the collection of filaments of marshalling from lint retainer side
Opening is loaded into pipe.Three sections of clamper side hatching lines are successively bonded into closure using adhesive tape.Utilize box spanner clamping two
Lint retainer is held, axially applies pulling force to both ends, guarantees fiber collimation arrangement.
Step 4: sample cutting and grinding and polishing
The fiber on median fiber clamper both sides is successively cut using scalpel, then using 60 mesh to 3000 mesh sand paper according to
It is secondary to polish, until smooth and smooth until specimen surface.Then collection of filaments sample two sides is exchanged, repeatedly 2-4
It is secondary, until specimen surface can be by optical fiber sem observation to clearly single fiber, while guaranteeing that upper and lower surface is parallel, up and down
Surface angle is not more than 5 °.Aforesaid operations are carried out, by sample grinding and polishing to 3mm thickness, obtain the thermally conductive sample finally prepared.
Utilize the thermally conductive formula k of two-dimentional steady flow of heat parallel modele=∑ikiφiIt can be calculated, volumetric filling ratio 50%
EC5.5-1212S110 type glass fibre thermal coefficient 0.7W/mK.
Embodiment 3
Step 1: collection of filaments volumetric filling ratio calculates
This example use the trade mark of Yixing City permanent mold Co., Ltd production for 1060 metal aluminum fiber, fibre diameter
It is 11.5 μm, single-stranded fiber beam is 4000, and cross-section fibers beam number is 163 beams, calculates fiber volume by formula 1.1~1.4
Filling rate is 60%.
Step 2: prepared by carbon fiber clamper
Specimen holder selects polyethylene pipe, internal diameter 12mm, wall thickness 1.5mm, length 6mm, length 7mm, side
Face parallel gripper axis is splitted.
Step 3: fiber loads
The neat segment of fiber for being 8cm long by continuous fiber tow cut growth degree immerses segment of fiber in dehydrated alcohol, leaching
Bubble 18min after take out, marshalling, and ensure fiber without twisting, while avoid fiber bifurcated fluff and fracture.By three sections of fibres
Clamper proper alignment is tieed up, guarantees axis point-blank, by the collection of filaments of marshalling from lint retainer side
Opening is loaded into pipe.Three sections of clamper side hatching lines are successively bonded into closure using adhesive tape.Utilize box spanner clamping two
Lint retainer is held, axially applies pulling force to both ends, guarantees fiber collimation arrangement.
Step 4: sample cutting and grinding and polishing
The fiber on median fiber clamper both sides is successively cut using scalpel.Fiber is from clamper one when to prevent grinding and polishing
End skids off, and is prepared for corresponding grinding and polishing tool.Using the polyvinyl chloride for solidifying E51 epoxy resin in pipe identical as clamper outer diameter
Pipe is as grinding and polishing tool.
Resin matrix is perfused in the collection of filaments.Sample is first placed in 50 DEG C of drying 3h in electric heating constant-temperature blowing drying box,
Keep solvent volatilization complete.Epoxy resin E51 and triethylene tetramine is selected to be used as resin system, control epoxy resin and curing agent
Additional amount is 100:10, weighs 20g epoxy resin E51 and 2g triethylene tetramine, is sufficiently stirred in beaker.The tree that will be mixed
Rouge is poured into conduction model above thermally conductive sample, is placed it under 25 DEG C of room temperature environments and is solidified 12h.Because the resin system is
Normal temperature cure system, solidifies it is not necessary that sample to be put into vacuum drying oven.
The thermally conductive sample of completion of cure is fixed together with grinding and polishing auxiliary tube using adhesive tape, pays attention to being kept in contact between face
It is parallel and seamless, it is then successively polished using 60 mesh to 3000 mesh sand paper, until smooth and smooth until specimen surface.
Then collection of filaments sample two sides is exchanged, 2-4 times repeatedly, until specimen surface can be by optical fiber sem observation to clearly
Clear single fiber, while guaranteeing 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
It throws to 6mm thickness, obtains the thermally conductive sample finally prepared.
Utilize the thermally conductive formula k of two-dimentional steady flow of heat parallel modele=∑ikiφiIt can be calculated, volumetric filling ratio 60%
Aluminum fiber thermal coefficient be 156W/mK.
It is able to know that according to above embodiments, the present invention provides a kind of examinations 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 provides
Test specimen, long Filamentous fiber can closely be fixed, and make fixed fiber with good collimation,
It can be good at for fiber axis in the test of heating conduction.Record according to the embodiment is it is found that the examination that the application obtains
Part be successfully used for laser shine method detection in, to obtain the thermal coefficient of sample be respectively 156W/mK, 0.7W/ for detection
MK and 52W/mK.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (6)
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；
The material of the clamper is polyvinyl chloride, polyethylene, polypropylene, polybutene, polybenzimidazoles or acrylic nitrile-butadiene two
Alkene-styrol copolymer；
The fiber to be measured is that raw fibre is placed in the pretreatment of fiber impregnated in preprocessing solution；The pretreatment
Solution is dehydrated alcohol or acetone；
The wall thickness of the clamper is 0.5 ~ 2mm, and length is 1 ~ 6mm, and internal diameter is 10 ~ 15mm；
Setting is parallel to the opening of hollow straight cylinder axis on the cylindrical wall of the clamper；
The preparation method of the test specimen for fiber axis guide thermal performance test, includes the following steps:
Three clampers are provided, and make the same straight line of the axis of three clampers；
Fiber to be measured is loaded into pipe from the opening of lint retainer side, is cutd open three sections of clamper sides using adhesive tape
Line successively bonds closure, makes fiber architecture to be measured and through the inside of three clampers；
Drawing-off will be carried out to both ends outside respectively after the gripper at both ends；
The fiber at intermediate clamper both ends is cut, a test specimen is obtained.
2. the test specimen according to claim 1 for fiber axis guide thermal performance test, which is characterized in that the immersion
Time is 15 ~ 20 minutes.
3. the test specimen according to claim 1 for fiber axis guide thermal performance test, which is characterized in that the fibre to be measured
Dimension is parallel to the axis distribution of hollow straight cylinder, and the both ends of fiber to be measured are located at two end faces of clamper same flat respectively
Face.
4. the test specimen according to claim 1 for fiber axis guide thermal performance test, which is characterized in that the fibre to be measured
Tieing up the volumetric filling ratio inside clamper is 50 ~ 70%.
5. the preparation method described in claim 1 ~ 4 any one for the test specimen of fiber axis guide thermal performance test, including such as
Lower step:
Three clampers are provided, and make the same straight line of the axis of three clampers；
Fiber to be measured is loaded into pipe from the opening of lint retainer side, is cutd open three sections of clamper sides using adhesive tape
Line successively bonds closure, makes fiber architecture to be measured and through the inside of three clampers；
Drawing-off will be carried out to both ends outside respectively after the gripper at both ends；
The fiber at intermediate clamper both ends is cut, a test specimen is obtained.
6. test specimen described in claim 1 ~ 4 any one according to laser shine method test application of the fiber axis to heating conduction.
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| EP3957972A4 (en) * | 2019-02-27 | 2022-12-07 | Beijing Center For Physical And Chemical Analysis | Carbon fibre bundle sample preparation apparatus, and preparation method for carbon fibre bundle |
| WO2020173507A1 (en) * | 2019-02-27 | 2020-09-03 | 北京市理化分析测试中心 | Carbon fibre bundle sample and preparation method therefor |
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