CN106699181A - Method for preparing pantograph carbon slide strip material from graphene oxide - Google Patents
Method for preparing pantograph carbon slide strip material from graphene oxide Download PDFInfo
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- CN106699181A CN106699181A CN201510776736.2A CN201510776736A CN106699181A CN 106699181 A CN106699181 A CN 106699181A CN 201510776736 A CN201510776736 A CN 201510776736A CN 106699181 A CN106699181 A CN 106699181A
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Abstract
The invention discloses a method for preparing a pantograph carbon slide strip material from graphene oxide. The method comprises the following steps: mixing graphene oxide, semi-reinforced carbon black and graphite powder with crushed, milled and screened pitch coke to form aggregate for preparing carbon slide strips; adding a binder to the aggregate, and mixing and kneading the aggregate and the binder to form a paste; carrying out pre-compression molding on the paste; and calcining the pre-compression molded paste to finally obtain the material suitable for pantograph carbon slide strips. The required carbon strip material can be obtained only through one-time calcination, so the production period is short. The pantograph carbon slide strips produced by using the graphene oxide have the advantages of good electricity conduction performance, high heat conduction performance, strong friction and wear resistance, and low cost of raw materials.
Description
Technical field
The invention belongs to electric locomotive technical field, more particularly to one kind pantograph carbon cunning is prepared using graphene oxide
The preparation method of strip material.
Background technology
With the development of science and technology, track traffic plays more and more important effect in national economy.In China
Today that national economy level is rapidly sent out, especially high ferro, motor-car and passenger-cargo electric locomotive etc. are in track traffic industry
Reveal booming situation.
And as the most important collection electric original copy pantograph of its power resources for, the even more most important thing.Due to bullet train
It is that electric energy is obtained from road network wire by the carbon slipper in pantograph, drives traction electric machine operation to drive train row
Sail, it is the essential condition for ensureing current collection at high speed, pantograph collector head that pantograph carbon slide is reliably contacted with road network wire
On carbon slipper and road network conductive contact, it is relative to slide, remove electric current from road network wire, be conveyed to electric locomotive,
This process is referred to as being flowed, during being flowed, road network wire and pantograph carbon slide it is mechanical with it is electrically close
Correlation, as long as one of them goes wrong, can all destroy normally by electrical characteristics.Pantograph carbon draw runner plate and road network
Once there is accident in wire, it will bring extremely serious consequence, directly contribute heavy economic losses, therefore, receiving
The preparation of pantograph carbon slipper undoubtedly turns into most critical, to ensure safety of railway traffic this eternal theme.Due to
Friction and impact are constantly produced in operation with contact line conducting wire, so this part is a kind of expendable of frequent replacing
Part.
Carbon slipper grew up in recent years, the high mechanical strength of commonly used carbon slipper on American-European bullet train,
The running kilometre number of each slide plate reaches 120,000 kms in German ICE operations.At present, carbon slipper is still domestic and international iron
The widely used preferred material of road department, carbon slipper is the material based on carbon-graphite, with good conduction.Lead
Heat and wear-resistant and self-lubrication, and with well suppress spark effect and high temperature it is indeformable, to contact net lead abrasion
Small the characteristics of, there must be strict wanting to its combination property as the selection of the key components carbon draw runner of carbon slipper
Seek index, it is necessary to have suitable resistivity and contact resistance, enough mechanical strengths, good anti-attrition and from
Lubricity, good heat-resisting, resistance to electric arc and certain wearability.
The Chinese patent of Application No. 201310582451.6, discloses a kind of pantograph carbon slide and its manufacture method,
Pantograph carbon slide is by petroleum coke powder, pitch coke powder, spray carbon black, sulphur, boron nitride, carbon fiber, natural
Graphite, Delanium, calcium chloride powder, transformation of the way pitch are that raw material stirring is mixed, and then carry out kneading, profit
Carbon slipper just base is made of the kneading material, is being calcined, be made sintering carbon slipper just base, sintering carbon is slided
Just base is impregnated, is calcined plate successively, dried process, and the production cycle of carbon slipper is long, it is necessary to carry out in this patent
Double roasting can be only achieved expected effect.
Diversification high-endization of other raw material, such as carbon fiber, native graphite material necessarily make the increase of its manufacturing cost.
Because high-end graphite product disclosure satisfy that pantograph carbon draw runner manufacturing technique requirent, but its price is very expensive, and
Domestic high performance graphite product is still in developing stage, and normal carbon material can not fully meet carbon draw runner physics and chemistry
Index,
For these reasons, it is special to propose the present invention.
The content of the invention
It is an object of the invention to provide the preparation side that a kind of utilization graphene oxide prepares pantograph carbon draw runner material
Method, graphene oxide be powdered graphite through the product after chemical oxidation and stripping, graphene oxide is single original
Sublayer, can expand to some tens of pm on lateral dimension at any time, therefore, the general chemistry of its construct trans and material
The typical size of material science.Graphene oxide can be considered a kind of flexible material of non-traditional kenel, with polymer,
Colloid, film, and amphiphatic molecule characteristic.The preparation method is slided using graphene oxide production pantograph carbon
Strip material is a kind of novel carbon product, with extraordinary physical and chemical index, due to the addition of graphene oxide,
Significantly improve electric conductivity, thermal conductivity and friction, the abrasiveness of pantograph carbon slide material, preparation method of the present invention
It is with short production cycle, meet desired sketching charcoal material by being once calcined to obtain final product.
To achieve the above object, the present invention is adopted the following technical scheme that：
A kind of utilization graphene oxide prepares the preparation method of pantograph carbon draw runner material, comprises the following steps：
(1) graphene oxide, semi-reinforcing hydrocarbon black, graphite powder and process are crushed, milling, the pitch coke of screening enter
Row mixing, as the aggregate of the carbon draw runner described in preparation；
(2) to binding agent is added in described aggregate, then by kneading, thickener is obtained；
(3) thickener is carried out into pre-molding；
(4) thickener of pre-molding is once calcined, obtains being applied to described pantograph carbon draw runner material.
By above method, pantograph carbon draw runner prepared by graphene oxide has good electric conductivity, thermal conductivity high
And rub resistance and abrasiveness is strong, the low advantage of cost of material.
Preferably, each component of the aggregate described in step (1) by weight percentage, graphene oxide 3-5%,
Semi-reinforcing hydrocarbon black 10-15%, graphite powder 6-8%, pitch coke 70-80%, the particle diameter of described pitch coke
0.15mm-2mm, the particle diameter of described aggregate is 0.15mm-2mm.
Proportioning more than, the particle diameter of described aggregate within this range because the distribution of grain diameter is direct
Influence the accumulation mode of particle, particle packing is tightr, the bulk density of carbon draw runner material is bigger, mechanical strength more
It is high.
Preferably, the particle diameter of described semi-reinforcing hydrocarbon black is 0.07mm-0.10mm；Described graphite powder particle diameter is
0.5-1mm；
The particle size range and content of described pitch coke be：
0.5mm ＜ particle diameters≤2mm 55-60%
Particle diameter≤0.15mm 40-45%.
The particles of aggregates of different-grain diameter is piled up more closely, and the bulk density of carbon draw runner material, the porosity, anti-folding resist
Compressive Strength and thermal coefficient of expansion can reach an extraordinary equilibrium valve, prepared carbon draw runner material volume density
Greatly, the porosity is small, anti-folding and anti-pressing ability is strong, thermal coefficient of expansion is small.
Wherein, in the preparation technology of carbon draw runner material, performance parameter influence of the formula on material is larger, particularly
To bulk density, resistivity, the porosity, mechanical strength influence.In general, squeezed using relatively fine particle formula
The molded bulk density for mentioning product is big, the porosity is smaller, bending and compressive strength is high, of the invention in dispensing,
Using the graphene oxide and semi-reinforcing hydrocarbon black of hyperfine structure, then pitch coke is crushed, be milled, sieved, made
It reaches little particle formula, and maximum particle diameter is 2mm, and minimum grain size is 0.15mm.In this particle size range, particle
The distribution of particle diameter directly affects the accumulation mode of particle, and particle packing is tightr, and the bulk density of carbon draw runner material is got over
Greatly, mechanical strength is higher.
Preferably, the aggregate described in step (2) and described weight of binder ratio are 74-71.5：26-28.5,
Preferably 74:26.
The extrusion forming mode that the present invention is used, therefore have strict proportioning to the consumption that the middle temperature of binding agent changes a social system coal tar pitch
It is required that, the consumption of binding agent and the surface area of aggregate have direct relation, and the particle diameter of aggregate is small, and surface area is bigger, glue
Knot agent consumption is then more, but consumption of binder is excessive, is difficult compacted during shaping, thus the bulk density of product is smaller,
And product is easily deformed after shaping.Aggregate of the present invention is 74 with binding agent proportioning:26, aggregate and binding agent after kneading,
The thickener for obtaining is not in substantially agglomerate, or has a little agglomerate, and bulk density products formed higher is obtained after shaping.
Preferably, the stretch modulus≤1.01TPa of graphene oxide described in step (1), ultimate strength≤116Gpa,
Resistivity≤0.6 μ Ω the m of described semi-reinforcing hydrocarbon black, the real density >=2.10g/cm of described pitch coke3, ash
Part ＜ 0.5%, volatile matter ＜ 0.8%.
Preferably, the binding agent described in step (2) is medium temperature coal pitch, the softening point of described medium temperature coal pitch
85-90 DEG C, coking value >=58%.
The present invention is conducive to obtaining bulk density roasting product higher using conditions above, is conducive to improving yield rate,
The need for its physical and chemical index is met pantograph carbon draw runner.
Preferably, the kneading described in step (2) is dry blend wet mixing, it is described it is dry-mixed be by described aggregate by
Proportioning is put into kneading pot, and stir speed (S.S.) is 45r/min, stirs 30-40min, and dry-mixed temperature is 160-180 DEG C；
Described wet mixing is that medium temperature coal pitch is first heated to 220 DEG C, then by pitch pipeline be injected into kneading pot in bone
Material is stirred, and thus obtains thickener.
Preferably, the pre-molding described in step (3) is that described thickener is pressed into preforming cylinder,
180 DEG C of precompressed temperature.
Preferably, described preforming cylinder is carried out into extrusion forming and obtains green article, described green compact system
Product bulk density >=1.75g/cm3。
It is furthermore preferred that described once roasting is to completely cut off under conditions of air described green article, in nitrogen
It is heat-treated in electric furnace, described heat treatment process is divided into following steps：
(1) described green article is warmed up to 550 DEG C of temperature from 150 DEG C with 1.1-2.1 DEG C/h of heating rate；
(2) 900 DEG C and then with 0.7-1.1 DEG C/h of heating rate are warmed up to from 550 DEG C；
(3) 1400 DEG C finally are warmed up to from 900 DEG C with 1.1-1.5 DEG C/h of heating rate.
The purpose of roasting is to carbonize binder pitch, and coke grid is formed between particles of aggregates, will be varigrained
Aggregate is bonded to an entirety securely.Little particle formula goes out when Carbon Materials are prepared in follow-up heat treatment process
Now the probability meeting of crackle is big, and yield rate is possible relatively low, the heating curve for passing through to optimize and improve when being calcined of the invention,
The factors such as the duration of heat, improve the coking rate of binding agent, overcome appearance crackle that little particle brings, into
The low problem of product rate, to ensure the yield rate of product overall target.
Roasting process of the present invention is carried out using nitrogen electric furnace under conditions of isolation air and oxygen, and maximum temperature reaches
To 1400 DEG C, 1.1-2.1 DEG C of intensification per hour in 150-550 DEG C of heating zone, lightweight fugitive constituent in roasting product with
Slower speed volatilization discharge, suffered pressure inside roasting product is smaller, more balance, it is to avoid heated up
Crackle is produced in journey, and light components have sufficient time discharge product；The polycondensation in roasting product at 550-900 DEG C
Increased response, coke is initially formed, per hour 0.7-1.1 DEG C of intensification, is conducive to improving the coking rate of binding agent, half
Coking is changed into coking；At 900-1400 DEG C, polycondensation reaction continuation occurs, the further coking of product, per hour
1.1-1.5 DEG C of intensification；Heated up with slower heating rate, be conducive to improving the bulk density and intensity of roasting product,
And roasting product is cracked when shrinking during avoiding polycondensation reaction；And heated up with very fast heating rate,
The institutional framework of roasting product is further densified, and obtains final suitable for pantograph carbon draw runner material.
Heat treatment process uses temperature alarming instrument control system, it is ensured that the poor scope of temperature alarming instrument is within 5 DEG C, it is ensured that produce
Product bulk density is more than 1.75g/cm3, the no crackle of product external and internal compositionses requirement, to be met pantograph carbon draw runner
It is required that material.
Compared with prior art, the present invention has following beneficial effect：
1st, the pantograph carbon draw runner that the present invention is prepared beneficial to graphene oxide, it is only necessary to which once roasting can be met
It is required that sketching charcoal material, it is with short production cycle.
2nd, pantograph carbon draw runner prepared by the graphene oxide that the present invention is provided has good electric conductivity, thermal conductivity high
And rub resistance and abrasiveness is strong, the low advantage of cost of material, the graphene oxide production pantograph carbon in the present invention is slided
Strip material, its bulk density >=1.75g/cm3, resistivity is≤40 μ Ω m, and compression strength is >=90Mpa, is resisted
Folding intensity is >=35Mpa, and Shore hardness is >=60HS, the km of anti-wear performance≤15mm/ ten thousand, to the abrasion of wire≤
0.015mm2/ ten thousand shelves.
Specific embodiment
Embodiment in following examples can be further combined or replace, and embodiment is only to the present invention
Preferred embodiment be described, not the spirit and scope of the present invention are defined, set the present invention is not departed from
On the premise of meter thought, various change and change that professional and technical personnel in the art make to technical scheme
Enter, belong to protection scope of the present invention
Embodiment 1
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 3%, half mend
Strong carbon black 10%, graphite powder 6%, pitch coke 71%.
Aggregate is 74 with the weight ratio of medium temperature coal pitch:26, medium temperature coal pitch softening point is 85 DEG C, and coking value is 58%,
Wherein the stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.07mm, resistivity 0.6 μ Ω m, the real density 2.10g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.5mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 55% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 45%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 30min, temperature
It is 160 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 1.1 DEG C/h of heating rate before this；Then with 0.7 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.1 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
Embodiment 2
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 3%, half mend
Strong carbon black 10%, graphite powder 7%, pitch coke 80%.
Aggregate is 73 with the weight ratio of medium temperature coal pitch:27, medium temperature coal pitch softening point is 87 DEG C, and coking value is 58%,
Wherein the stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.08mm, resistivity 0.4 μ Ω m, the real density 2.50g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.5mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 57% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 43%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 35min, temperature
It is 170 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 1.5 DEG C/h of heating rate before this；Then with 0.9 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.3 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
Embodiment 3
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 4%, half mend
Strong carbon black 12%, graphite powder 7%, pitch coke 77%.
Aggregate is 72 with the weight ratio of medium temperature coal pitch:28, medium temperature coal pitch softening point is 88 DEG C, and coking value is 60%,
Wherein the stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.09mm, resistivity 0.4 μ Ω m, the real density 2.50g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.9mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 58% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 42%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 38min, temperature
It is 175 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 1.3 DEG C/h of heating rate before this；Then with 1.0 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.2 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
Embodiment 4
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 5%, half mend
Strong carbon black 15%, graphite powder 8%, pitch coke 72%.
Aggregate is 71.5 with the weight ratio of medium temperature coal pitch:28.5, medium temperature coal pitch softening point is 90 DEG C, and coking value is
65%, the wherein stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.09mm, resistivity 0.4 μ Ω m, the real density 2.50g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.9mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 58% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 42%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 38min, temperature
It is 175 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 1.3 DEG C/h of heating rate before this；Then with 1.0 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.2 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
Embodiment 5
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 3%, half mend
Strong carbon black 10%, graphite powder 6%, pitch coke 71%.
Aggregate is 74 with the weight ratio of medium temperature coal pitch:26, medium temperature coal pitch softening point is 85 DEG C, and coking value is 58%,
Wherein the stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.07mm, resistivity 0.6 μ Ω m, the real density 2.10g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.5mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 55% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 45%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 30min, temperature
It is 160 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 2.1 DEG C/h of heating rate before this；Then with 1.1 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.5 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
Embodiment 6
(1) aggregate for preparing pantograph carbon draw runner according to percentage by weight preparation is：Graphene oxide 3%, half mend
Strong carbon black 10%, graphite powder 7%, pitch coke 80%.
Aggregate is 73 with the weight ratio of medium temperature coal pitch:27, medium temperature coal pitch softening point is 87 DEG C, and coking value is 58%,
Wherein the stretch modulus of graphene oxide is 1.01TPa, ultimate strength 116Gpa, and semi-reinforcing hydrocarbon black particle diameter is
0.08mm, resistivity 0.4 μ Ω m, the real density 2.50g/cm of pitch coke3, ash content 0.45%, volatile matter 0.75%,
Graphite powder particle diameter is 0.5mm, wherein, pitch coke being crushed, be milled, sieved, pitch coke particle diameter is 0.5mm
＜ particle diameters≤2mm accounts for the percentage by weight 57% of total pitch coke, and particle diameter≤0.15mm accounts for the weight hundred of total pitch coke
Divide and compare 43%, the aggregate size of preparation is 0.15mm-2mm.
(2) ready aggregate above is put into kneading pot, stir speed (S.S.) is 45r/min, stirs 35min, temperature
It is 170 DEG C to spend, and medium temperature coal pitch above then is heated into 220 DEG C, is then injected into kneading by pitch pipeline
It is sufficiently stirred for aggregate in pot, thus obtains thickener.
(3) thickener that will be obtained is pressed into cylinder at 180 DEG C, carries out the plasticity of next step, will be preforming
Cylinder is extruded, and obtains green article.
(4) green article above is put into nitrogen electric furnace, is heat-treated under conditions of air is completely cut off, it is first
550 DEG C of temperature were warmed up to from 150 DEG C with 2.0 DEG C/h of heating rate before this；Then with 1.0 DEG C/h of heating rate from 550 DEG C
It is warmed up to 900 DEG C；1400 DEG C finally are warmed up to from 900 DEG C with 1.4 DEG C/h of heating rate, receiving for condition is met
The material of pantograph carbon draw runner requirement.
It is controlled using temperature alarming instrument in temperature-rise period above, it is ensured that the error range of temperature alarming instrument is at 5 DEG C
Within, product external and internal compositionses do not have crackle.
Performance test is carried out to carbon draw runner obtained above, test result is shown in Table 1.
The carbon draw runner the performance test results of table 1
As can be seen from Table 1, the conducting electricity very well of pantograph carbon draw runner that is prepared using graphene oxide, machinery are strong
Degree is high, shock resistance is good, wear-resistant.
Test example
The test example has investigated property of the assistant ingredients to obtained pantograph carbon draw runner under the conditions of preparation method identical
The influence of energy parameter.
Reference substance 1：Graphene oxide being changed into native graphite in aggregate and preparing pantograph carbon draw runner, preparation method is with real
Apply example 1；The performance test results are shown in Table 2.
Reference substance 2：Semi-reinforcing hydrocarbon black is not added with aggregate and prepares pantograph carbon draw runner, preparation method is with embodiment 1；Property
Energy test result is shown in Table 2.
Reference substance 3：The particle size range of semi-reinforcing hydrocarbon black is in aggregate：0.1mm≤particle diameter≤0.15mm, preparation method
With embodiment 1；The performance test results are shown in Table 2.
The performance test results of table 2, each reference substance
Claims (10)
1. a kind of utilization graphene oxide prepares the preparation method of pantograph carbon draw runner material, it is characterised in that including
Following steps：
(1) graphene oxide, semi-reinforcing hydrocarbon black, graphite powder and process are crushed, milling, the pitch coke of screening enter
Row mixing, as the aggregate of the carbon draw runner described in preparation；
(2) to binding agent is added in described aggregate, then by kneading, thickener is obtained；
(3) thickener is carried out into pre-molding；
(4) thickener of pre-molding is once calcined, obtains being applied to described pantograph carbon draw runner material.
2. a kind of utilization graphene oxide according to claim 1 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that each component of the aggregate described in step (1) by weight percentage, graphene oxide 3-5%,
Semi-reinforcing hydrocarbon black 10-15%, graphite powder 6-8%, pitch coke 70-80%, the particle diameter 0.15mm-2mm of described aggregate.
3. a kind of utilization graphene oxide prepares the preparation method of pantograph carbon draw runner material according to claim 1,
Characterized in that, the particle diameter of the semi-reinforcing hydrocarbon black described in step (1) is 0.07mm-0.10mm；Described graphite
Powder footpath is 0.5-1mm；
The particle size range and content of described pitch coke be：
0.5mm ＜ particle diameters≤2mm 55-60%
Particle diameter≤0.15mm 40-45%.
4. a kind of utilization graphene oxide according to claim 1 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that aggregate and described weight of binder ratio described in step (2) are 74-71.5：26-28.5,
Preferably 74:26.
5. a kind of utilization graphene oxide according to claim 1 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that the stretch modulus≤1.01TPa of graphene oxide described in step (1), ultimate strength≤
116Gpa, the resistivity≤0.6 μ Ω m of described semi-reinforcing hydrocarbon black, the real density of described pitch coke >=
2.10g/cm3, ash ＜ 0.5%, volatile matter ＜ 0.8%.
6. a kind of utilization graphene oxide according to claim 1 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that binding agent described in step (2) is medium temperature coal pitch, described medium temperature coal pitch it is soft
Change 85-90 DEG C of point, coking value >=58%.
7. a kind of utilization graphene oxide according to claim 1 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that kneading described in step (2) is dry blend wet mixing, it is described it is dry-mixed be by described bone
Material is put into kneading pot by proportioning, and stir speed (S.S.) is 45r/min, stirs 30-40min, and dry-mixed temperature is 160-180 DEG C；
Described wet mixing is that medium temperature coal pitch is first heated to 220 DEG C, then by pitch pipeline be injected into kneading pot in bone
Material is stirred, and thus obtains thickener.
8. the one kind according to claim any one of 1-6 prepares pantograph carbon draw runner material using graphene oxide
Preparation method, it is characterised in that the pre-molding described in step (3) is that described thickener is pressed into preformation
The cylinder of type, 180 DEG C of precompressed temperature.
9. a kind of utilization graphene oxide according to claim 7 prepares the preparation side of pantograph carbon draw runner material
Method, it is characterised in that described preforming cylinder is carried out into extrusion forming and obtains green article, described life
Base product volume density >=1.75g/cm3。
10. a kind of utilization graphene oxide according to claim 8 prepares the preparation of pantograph carbon draw runner material
Method, it is characterised in that described once roasting be by described green article completely cutting off under conditions of air,
It is heat-treated in nitrogen electric furnace, described heat treatment process is divided into following steps：
(1) described green article is warmed up to 550 DEG C of temperature from 150 DEG C with 1.1-2.1 DEG C/h of heating rate；
(2) 900 DEG C and then with 0.7-1.1 DEG C/h of heating rate are warmed up to from 550 DEG C；
(3) 1400 DEG C finally are warmed up to from 900 DEG C with 1.1-1.5 DEG C/h of heating rate.
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| CN115959908A (en) * | 2022-12-07 | 2023-04-14 | 西南交通大学 | Method and device for uniformly growing graphene in carbon sliding block |
| CN115959908B (en) * | 2022-12-07 | 2023-08-22 | 西南交通大学 | Method and device for uniformly growing graphene in carbon sliding block |
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