CN102766309A - Filling formula of modified polytetrafluoroethylene high-thermal-conductivity composite material and obtaining method of filling formula - Google Patents
Filling formula of modified polytetrafluoroethylene high-thermal-conductivity composite material and obtaining method of filling formula Download PDFInfo
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Abstract
The invention belongs to the technical field of material synthesis and provides a filling formula of a modified polytetrafluoroethylene high-thermal-conductivity composite material and an obtaining method of the filling formula. The filling formula comprises 18+/-0.5 volume percent of graphite and 10 volume percent of carbon fiber. The thermal conductivity of the graphite and carbon fiber double-phase filled modified polytetrafluoroethylene high-thermal-conductivity composite material is researched by a thermal-conductivity measuring device, the mechanical property of the graphite-filled modified polytetrafluoroethylene high-thermal-conductivity composite material is subjected by simulation research by finite element value, the mechanical property of the carbon fiber-filled modified polytetrafluoroethylene high-thermal-conductivity composite material is obtained through theoretical derivation, and the mechanical property of the modified polytetrafluoroethylene high-thermal-conductivity composite material is researched according to an empirical formula, so that the purposes of optimizing and seeking the optimal proportion of the graphite to the carbon fiber systematically is fulfilled, the modified polytetrafluoroethylene high-thermal-conductivity composite material has the optimal thermal conductivity on the premise of meeting the requirement of structural strength, and the corrosion resistance and the heat exchange efficiency of a corrosion-resistant heat exchanger are effectively improved.
Description
Technical field
The invention belongs to field of material synthesis technology, relate in particular to a kind of prescription and acquisition methods thereof of filling-modified tetrafluoroethylene high-heat-conductive composite material.
Background technology
In the process of petrochemical complex and drug manufacture, the part heat-exchange equipment is through the work under the corrosive atmosphere of being everlasting.The corrosion-resistant interchanger of using at present mainly contains two types: the first kind is the board-like or tube and shell heat exchanger that alloy materials such as titanium plate, nickel plate, Mo2Ti are made; Second type is, the interchanger that non-metallic material such as graphite, PTFE, PP are made.The cost of alloy material is higher, and under severe corrosive, the alloy part material also can corrode, and has restricted the use range of the board-like or tube and shell heat exchanger of alloy material class; The running cost of non-metal kind interchanger is low but its heat exchange efficiency is very low, and the interchanger that utilizes graphite, thomel two mutually filling-modified PTFE matrix materials to process has overcome these shortcomings of erosion resistance interchanger commonly used.
Prior art is only studied the part key performance of graphite, thomel two mutually filling-modified PTFE matrix materials, but do not have systematic go to optimize seek the two best proportioning, thereby make matrix material reach optimum performance.
Summary of the invention
The invention provides a kind of prescription and acquisition methods thereof of filling-modified tetrafluoroethylene high-heat-conductive composite material; Being intended to solve prior art only studies the part key performance of graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite materials; But do not have to go to optimize seeks the two best proportioning systemicly, fails to make the modified Teflon high-heat-conductive composite material to reach the problem of optimum performance.
The object of the present invention is to provide a kind of prescription of filling-modified tetrafluoroethylene high-heat-conductive composite material, this prescription comprises: graphite, thomel, and said graphite-filled volume(tric)fraction is 18 ± 0.5%, the volume(tric)fraction of said filled with carbon fibers is 10%.
Further, the thomel in this prescription need carry out surface treatment before filling.
Further, thomel being carried out the surface-treated method comprises: plasma method, ion processing method, coating processing, oxidation style, coupling agent treatment method, solution reduction processing and the method for purification, surperficial whiskerizing method, electropolymerization and electrodeposition process method.
Further, granularity is that 250 purpose graphite are more obvious than other granularity to the thermal conductivity modified effect of modified Teflon high-heat-conductive composite material.
Another object of the present invention is to provide a kind of method that obtains filling-modified tetrafluoroethylene high-heat-conductive composite material prescription, this method may further comprise the steps:
Step 2; According to plastic material tension test principle; By GB1040-1992 graphite modified tetrafluoroethylene high-heat-conductive composite material is carried out tension test, the tensile property curve and the corresponding graphite that obtain the modified Teflon high-heat-conductive composite material add the tensile strength under the volume(tric)fraction;
Step 3 is the basis with the Fourier's law, account temperature gradient and evenly heat flow, and the equivalent temperature gradient of introducing the Eshelby definition reaches the vector matrix relevant with the fiber length-to-diameter ratio, derives the prediction correlation that thomel adds the matrix material thermal conductivity;
Step 6 through MATLAB constraint nonlinear programming, is found the solution when satisfying modified Teflon high-heat-conductive composite material requirement of strength and thermal conductivity maximum the volume(tric)fraction that graphite and thomel are filled in the modified Teflon high-heat-conductive composite material.
Further, in step 3, the prediction correlation that thomel adds the matrix material thermal conductivity is:
Wherein, λ ' is the thermal conductivity W/mK of matrix material before the filled with carbon fibers modification; V is a fiber volume fraction; B is and the relevant constant of fiber condition distribution;
Be thomel axial thermal conductivity W/mK; λ
FxBe thomel radial thermal conductivity W/mK.
Further, in step 4, the prediction correlation that utilizes multilinear fitting to obtain graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite material thermal conductivities is:
λ＝1.98829V
1+12.91491V
2-0.2886；
Wherein, V
1It is graphite-filled volume(tric)fraction; V
2Be the filled with carbon fibers volume(tric)fraction, this formula is applicable to V
1≤26%; V
2≤10%.
Further, in step 6, when finding the solution the volume(tric)fraction that graphite and thomel fill through MATLAB constraint nonlinear programming in the modified Teflon high-heat-conductive composite material, the constraint condition that objective function need satisfy is:
Constraint condition 1: the funtcional relationship of the volume(tric)fraction of thermal conductivity and graphite: λ=1.988V
1+ 1;
Constraint condition 2: the funtcional relationship of the volume(tric)fraction of intensity and graphite:
Constraint condition 3: intensity is not less than 20MPa;
Wherein, λ, σ, V
1The thermal conductivity W/mK, the intensity MPa that represent filling-modified matrix material respectively, and the volume(tric)fraction of filling graphite.
The prescription of filling-modified tetrafluoroethylene high-heat-conductive composite material provided by the invention and acquisition methods thereof, graphite-filled volume(tric)fraction are 18 ± 0.5%, and the volume(tric)fraction of said filled with carbon fibers is 10%; Utilize the thermal conductivity of thermal conductivity measuring apparatus research graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite materials; Utilize the mechanical property of stretching and electron-microscope scanning experimental study modified Teflon high-heat-conductive composite material; Utilize finite element numerical simulation to study the mechanical property of graphite modified tetrafluoroethylene high-heat-conductive composite material; And obtain the mechanical property that thomel adds the modified Teflon high-heat-conductive composite material by theoretical derivation; Utilize the mechanical property of experimental formula research modified Teflon high-heat-conductive composite material; Reached and optimized the purpose of seeking the two best proportioning systematically; The modified Teflon high-heat-conductive composite material is required down satisfying structural strength, heat conductivility reaches the best, has improved the erosion resistance and the heat exchange efficiency of the erosion resistance interchanger that the modified Teflon high-heat-conductive composite material processes effectively.
Description of drawings
Fig. 1 is the realization flow figure of the method for the filling-modified tetrafluoroethylene high-heat-conductive composite material prescription of the acquisition that provides of the embodiment of the invention;
Fig. 2 is the synoptic diagram as a result of the predictor of the result who utilizes finite element numerical simulation that provides of the embodiment of the invention and experimental value, M-E model and N-L model;
Fig. 3 is deciding under the volume(tric)fraction of providing of the embodiment of the invention, the synoptic diagram as a result of the thermal conductivity of the filling-modified tetrafluoroethylene high-heat-conductive composite material of simulation different grain size graphite granule;
Fig. 5 is the as a result synoptic diagram of the simulation different grain size graphite that provides of the embodiment of the invention to the influence of modified Teflon high-heat-conductive composite material thermal conductivity;
Fig. 4 be the embodiment of the invention provide when graphite-filled volume(tric)fraction 40% when following, graphite stochastic distribution and being evenly distributed in the tetrafluoroethylene high-heat-conductive composite material matrix is to the synoptic diagram as a result of modified Teflon high-heat-conductive composite material thermal conductivity;
Fig. 6 be the embodiment of the invention provide to 250 order granularities, the interval of packing volume mark 14%～26%, with 2% serve as at interval Study on thinning graphite volume(tric)fraction to the synoptic diagram as a result of modified Teflon high-heat-conductive composite material thermal conductivity influence;
Fig. 7 be the embodiment of the invention provide according to plastic material tension test principle; By GB1040-1992 graphite modified tetrafluoroethylene high-heat-conductive composite material is carried out tension test, the tensile property curve of matrix material and corresponding graphite add the synoptic diagram as a result of volume(tric)fraction stretched intensity after the modification.
Embodiment
In order to make the object of the invention, technical scheme and advantage clearer,, the present invention is further specified below in conjunction with accompanying drawing and embodiment.Should be appreciated that specific embodiment described herein only in order to explanation the present invention, and be not used in the qualification invention.
The object of the present invention is to provide a kind of prescription of filling-modified tetrafluoroethylene high-heat-conductive composite material, this prescription comprises: graphite, thomel, graphite-filled volume(tric)fraction are 18 ± 0.5%, and the volume(tric)fraction of filled with carbon fibers is 10%.
In embodiments of the present invention, the thomel in this prescription need carry out surface treatment before filling.
In embodiments of the present invention, thomel being carried out the surface-treated method comprises: plasma method, ion processing method, coating processing, oxidation style, coupling agent treatment method, solution reduction processing and the method for purification, surperficial whiskerizing method, electropolymerization and electrodeposition process method.
In embodiments of the present invention, granularity is that 250 purpose graphite are more obvious than other granularity to the thermal conductivity modified effect of modified Teflon high-heat-conductive composite material.
The realization flow of the method that the filling-modified tetrafluoroethylene high-heat-conductive composite material of acquisition that Fig. 1 shows the embodiment of the invention to be provided is filled a prescription.
This method comprises:
This method may further comprise the steps:
In step S101; The graphite-filled modified Teflon high-heat-conductive composite material thermal conductivity simulation finite element analysis command stream that adopts APDL to write is carried out numerical simulation, and research graphite particle size, volume(tric)fraction and distribution mode are to the influence of modified ptfe matrix material thermal conductivity;
In step S102; According to plastic material tension test principle; By GB1040-1992 graphite modified tetrafluoroethylene high-heat-conductive composite material is carried out tension test, the tensile property curve and the corresponding graphite that obtain the modified Teflon high-heat-conductive composite material add the tensile strength under the volume(tric)fraction;
In step S103, be the basis with the Fourier's law, account temperature gradient and evenly heat flow, the equivalent temperature gradient of introducing the Eshelby definition reaches the vector matrix relevant with the fiber length-to-diameter ratio, derives the prediction correlation that thomel adds the matrix material thermal conductivity;
In step S104, utilize multilinear fitting to obtain the prediction correlation of graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite material thermal conductivities;
In step S105, mix rule according to the intensity of HalPin-Tsai model and short fiber reinforced composite, obtain the Young's modulus and the intensity of carbon fibre reinforced composite respectively;
In step S106,, find the solution when satisfying modified Teflon high-heat-conductive composite material requirement of strength and thermal conductivity maximum the volume(tric)fraction that graphite and thomel are filled in the modified Teflon high-heat-conductive composite material through MATLAB constraint nonlinear programming.
In embodiments of the present invention, in step S103, the prediction correlation that thomel adds the matrix material thermal conductivity is:
Wherein, λ ' is the thermal conductivity W/mK of matrix material before the filled with carbon fibers modification; V is the thomel volume(tric)fraction; B is the constant relevant with the thomel distributions;
λ
FzBe thomel axial thermal conductivity W/mK; λ
FxBe thomel radial thermal conductivity W/mK.
In embodiments of the present invention, in step S104, the prediction correlation that utilizes multilinear fitting to obtain graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite material thermal conductivities is:
λ＝1.98829V
1+12.91491V
2-0.2886；
Wherein, V
1It is graphite-filled volume(tric)fraction; V
2Be the filled with carbon fibers volume(tric)fraction, this formula is applicable to V
1≤26%; V
2≤10%.
In embodiments of the present invention, in step S106, when finding the solution the volume(tric)fraction that graphite and thomel fill through MATLAB constraint nonlinear programming in the modified Teflon high-heat-conductive composite material, the constraint condition that objective function need satisfy is:
Constraint condition 1: the funtcional relationship of the volume(tric)fraction of thermal conductivity and graphite: λ=1.988V
1+ 1;
Constraint condition 2: the funtcional relationship of the volume(tric)fraction of intensity and graphite:
Constraint condition 3: intensity is not less than 20MPa;
Wherein, λ, σ, V
1The thermal conductivity W/mK, the intensity MPa that represent filling-modified matrix material respectively, and the volume(tric)fraction of filling graphite.
Below in conjunction with accompanying drawing and specific embodiment application principle of the present invention is further described.
As can beappreciated from fig. 2 utilize the result of finite element numerical simulation and the predictor worst error of experimental value and M-E model and N-L model to be no more than 8%, and trend is consistent; Show and to adopt the graphite-filled PTFE matrix material thermal conductivity simulation finite element analysis command stream that APDL writes to carry out numerical simulation, study the heat conductivility of graphite modified PTFE matrix material.
The graphite-filled PTFE matrix material thermal conductivity simulation finite element analysis command stream that adopts APDL to write is carried out numerical simulation, and systematized research graphite particle size, volume(tric)fraction and distribution mode are to the influence of modified ptfe matrix material thermal conductivity.
Can know from Fig. 3; Deciding under the volume(tric)fraction; Simulation different grain size graphite granule is filled the thermal conductivity of PTFE matrix material, and its thermal conductivity is not to do the monotone variation of simple increase or minimizing along with the order number, but on the curve that changes, has extreme point; Show simple refinement graphite granule granularity, can not improve the thermal conductivity of modified composite material effectively; 250 order granularity graphite more have superiority than other granularity to the thermal conductivity modified effect of PTFE.
Can see that from Fig. 4 graphite-filled volume(tric)fraction increases, the trend that the net heat conductance increases is identical; In graphite-filled volume(tric)fraction hour, different grain size graphite differs very little to the influence of the thermal conductivity of modified ptfe matrix material; Be accompanied by the increase of graphite-filled volume(tric)fraction, different grain size graphite engenders difference to the thermal conductivity influence of modified composite material, and the rate of rise of thermal conductivity is more and more faster.
As can be seen from Figure 5; Graphite-filled volume(tric)fraction is 40% when following; In the PTFE matrix,, almost can ignore no matter graphite stochastic distribution or uniform distribution differ very little (relative error is about 0.3%) to the thermal conductivity influence degree of modified ptfe matrix material; Show and to select for use the stochastic distribution that approaches actual state to replace uniform distribution, study the numerical simulation of the thermal conductivity of graphite modified PTFE matrix material.
Consider that mass content of graphite reaches at 30 o'clock; Very easily cracking basically can not carry load after itself and PTFE were compound; Therefore satisfy the intensity request for utilization, best graphite adding proportion should be between 15%～25%, and the understanding graphite adding proportion of seeing for refinement more is to the influence of modified composite material heat conductivility; The present invention is to 250 order granularities; The interval of packing volume mark 14%～26% serves as that Study on thinning graphite volume(tric)fraction is to the influence of modified ptfe matrix material thermal conductivity at interval with 2%, and analog result is seen Fig. 6.
According to plastic material tension test principle, by GB1040-1992 graphite modified PTFE matrix material is carried out tension test, obtain the tensile property curve of matrix material after the modification and tensile strength that corresponding graphite adds under the volume(tric)fraction and see Fig. 7.
With the Fourier's law is the basis, and account temperature gradient and evenly heat flow are introduced the equivalent temperature gradient H that Eshelby defines
*With the vector matrix S relevant, derive the prediction correlation that thomel adds the matrix material thermal conductivity with the fiber length-to-diameter ratio:
Utilize multilinear fitting to obtain the prediction correlation of graphite, thomel two mutually filling-modified PTFE matrix material thermal conductivities:.
λ＝1.98829V
1+12.91491V
2-0.2886
V
1It is graphite-filled volume(tric)fraction; V
2It is the filled with carbon fibers volume(tric)fraction.The formula that match is come out is applicable to V
1≤26%; V
2≤10%, fitting result and numerical value and the correlation relative error that predicts the outcome is not more than 10%.
The intensity of HalPin-Tsai model and short fiber reinforced composite is mixed rule; Obtain the Young's modulus and the intensity of carbon fibre reinforced composite respectively; After the correction factor correction, composite material strength and actual value are very near can be used as the technological design reference value.
Objective function is sought the thermal conductivity maximum when satisfying requirement of strength, and its constraint condition is:
Constraint condition 1: the funtcional relationship of the volume(tric)fraction of thermal conductivity and graphite: λ=1.988V
1+ 1;
Constraint condition 2: the funtcional relationship of the volume(tric)fraction of intensity and graphite:
Constraint condition 3: intensity is not less than 20MPa;
MATLAB constraint nonlinear programming is found the solution, and obtains prescription and is: graphite volume(tric)fraction 18 ± 0.5%, and thomel volume(tric)fraction 10%, wherein the graphite volume(tric)fraction is that the thermal conductivity of 18% o'clock matrix material is 1.43W/ (mK), tensile strength is 20.21MP.
The prescription and the acquisition methods thereof of the filling-modified tetrafluoroethylene high-heat-conductive composite material that the embodiment of the invention provides, graphite-filled volume(tric)fraction are 18 ± 0.5%, and the volume(tric)fraction of filled with carbon fibers is 10%; Utilize the thermal conductivity of thermal conductivity measuring apparatus research graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite materials; Utilize the mechanical property of stretching and electron-microscope scanning experimental study modified Teflon high-heat-conductive composite material; Utilize finite element numerical simulation to study the mechanical property of graphite modified tetrafluoroethylene high-heat-conductive composite material; And obtain the mechanical property that thomel adds the modified Teflon high-heat-conductive composite material by theoretical derivation; Utilize the mechanical property of experimental formula research modified Teflon high-heat-conductive composite material; Reached and optimized the purpose of seeking the two best proportioning systematically; The modified Teflon high-heat-conductive composite material is required down satisfying structural strength, heat conductivility reaches the best, has improved the erosion resistance and the heat exchange efficiency of the erosion resistance interchanger that the modified Teflon high-heat-conductive composite material processes effectively.
More than be merely preferred embodiment of the present invention,, all any modifications of within spirit of the present invention and principle, being done, be equal to and replace and improvement etc., all should be included within protection scope of the present invention not in order to restriction the present invention.
Claims (8)
1. the prescription of a filling-modified tetrafluoroethylene high-heat-conductive composite material, this prescription comprises: graphite, thomel, it is characterized in that said graphite-filled volume(tric)fraction is 18 ± 0.5%, the volume(tric)fraction of said filled with carbon fibers is 10%.
2. prescription as claimed in claim 1 is characterized in that, the thomel in this prescription need carry out surface treatment before filling.
3. prescription as claimed in claim 1; It is characterized in that, thomel is carried out the surface-treated method comprise: plasma method, ion processing method, coating processing, oxidation style, coupling agent treatment method, solution reduction processing and the method for purification, surperficial whiskerizing method, electropolymerization and electrodeposition process method.
4. prescription as claimed in claim 1 is characterized in that, granularity is that 250 purpose graphite are more obvious than other granularity to the thermal conductivity modified effect of modified Teflon high-heat-conductive composite material.
5. one kind obtains the method that filling-modified tetrafluoroethylene high-heat-conductive composite material is filled a prescription, and it is characterized in that this method may further comprise the steps:
Step 1; The graphite-filled modified Teflon high-heat-conductive composite material thermal conductivity simulation finite element analysis command stream that adopts APDL to write is carried out numerical simulation, and research graphite particle size, volume(tric)fraction and distribution mode are to the influence of modified ptfe matrix material thermal conductivity;
Step 2; According to plastic material tension test principle; By GB1040-1992 graphite modified tetrafluoroethylene high-heat-conductive composite material is carried out tension test, the tensile property curve and the corresponding graphite that obtain the modified Teflon high-heat-conductive composite material add the tensile strength under the volume(tric)fraction;
Step 3 is the basis with the Fourier's law, account temperature gradient and evenly heat flow, and the equivalent temperature gradient of introducing the Eshelby definition reaches the vector matrix relevant with the fiber length-to-diameter ratio, derives the prediction correlation that thomel adds the matrix material thermal conductivity;
Step 4 utilizes multilinear fitting to obtain the prediction correlation of graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite material thermal conductivities;
Step 5 is mixed rule according to the intensity of HalPin-Tsai model and short fiber reinforced composite, obtains the Young's modulus and the intensity of carbon fibre reinforced composite respectively;
Step 6 through MATLAB constraint nonlinear programming, is found the solution when satisfying modified Teflon high-heat-conductive composite material requirement of strength and thermal conductivity maximum the volume(tric)fraction that graphite and thomel are filled in the modified Teflon high-heat-conductive composite material.
6. method as claimed in claim 5 is characterized in that, in step 3, the prediction correlation that thomel adds the matrix material thermal conductivity is:
Wherein, λ ' is the thermal conductivity W/mK of matrix material before the filled with carbon fibers modification; V is the thomel volume(tric)fraction; B is the constant relevant with the thomel distributions;
λ
FzBe thomel axial thermal conductivity W/mK; λ
FxBe thomel radial thermal conductivity W/mK.
7. method as claimed in claim 5 is characterized in that, in step 4, the prediction correlation that utilizes multilinear fitting to obtain graphite, thomel two mutually filling-modified tetrafluoroethylene high-heat-conductive composite material thermal conductivities is: λ=1.98829V
1+ 12.91491V
2-0.2886;
Wherein, V
1It is graphite-filled volume(tric)fraction; V
2Be the filled with carbon fibers volume(tric)fraction, this formula is applicable to V
1≤26%; V
2≤10%.
8. method as claimed in claim 5; It is characterized in that; In step 6, when finding the solution the volume(tric)fraction that graphite and thomel fill through MATLAB constraint nonlinear programming in the modified Teflon high-heat-conductive composite material, the constraint condition that objective function need satisfy is:
Constraint condition 1: the funtcional relationship λ of the volume(tric)fraction of thermal conductivity and graphite=1.988V
1+ 1;
Constraint condition 2: the funtcional relationship of the volume(tric)fraction of intensity and graphite
Constraint condition 3: intensity is not less than 20MPa;
Wherein, λ, σ, V
1The thermal conductivity W/mK, the intensity MPa that represent filling-modified matrix material respectively, and the volume(tric)fraction of filling graphite.
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Cited By (7)
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| CN103172924A (en) * | 2013-04-17 | 2013-06-26 | 天津大学 | High-thermal conductivity polymer composite material and preparation method thereof |
| CN105086301A (en) * | 2015-07-30 | 2015-11-25 | 洪小月 | High-thermal-conductivity PTFE pipe for thermal power heat exchanger |
| CN106543608A (en) * | 2016-12-09 | 2017-03-29 | 钦州学院 | The manufacture method of modified carbon fiber reinforced resin based composites |
| CN107609331A (en) * | 2017-09-08 | 2018-01-19 | 中国科学院地球化学研究所 | A kind of continuous basalt fiber optimized formula design |
| CN109459298A (en) * | 2018-12-27 | 2019-03-12 | 广东省材料与加工研究所 | A kind of prediction technique of double metallic composite material intensity |
| CN112454953A (en) * | 2020-11-25 | 2021-03-09 | 山东东岳高分子材料有限公司 | Preparation process of high-heat-conductivity pressure-resistant PTFE (polytetrafluoroethylene) pipe |
| CN114031872A (en) * | 2021-12-02 | 2022-02-11 | 沈阳工业大学 | Polytetrafluoroethylene sealing friction material for hydraulic oil cylinder and preparation method thereof |
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103172924A (en) * | 2013-04-17 | 2013-06-26 | 天津大学 | High-thermal conductivity polymer composite material and preparation method thereof |
| CN105086301A (en) * | 2015-07-30 | 2015-11-25 | 洪小月 | High-thermal-conductivity PTFE pipe for thermal power heat exchanger |
| CN106543608A (en) * | 2016-12-09 | 2017-03-29 | 钦州学院 | The manufacture method of modified carbon fiber reinforced resin based composites |
| CN107609331A (en) * | 2017-09-08 | 2018-01-19 | 中国科学院地球化学研究所 | A kind of continuous basalt fiber optimized formula design |
| CN109459298A (en) * | 2018-12-27 | 2019-03-12 | 广东省材料与加工研究所 | A kind of prediction technique of double metallic composite material intensity |
| CN112454953A (en) * | 2020-11-25 | 2021-03-09 | 山东东岳高分子材料有限公司 | Preparation process of high-heat-conductivity pressure-resistant PTFE (polytetrafluoroethylene) pipe |
| CN114031872A (en) * | 2021-12-02 | 2022-02-11 | 沈阳工业大学 | Polytetrafluoroethylene sealing friction material for hydraulic oil cylinder and preparation method thereof |
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