CN105508479B - A kind of preparation method of high abrasion high heat conduction brake block - Google Patents
A kind of preparation method of high abrasion high heat conduction brake block Download PDFInfo
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- CN105508479B CN105508479B CN201610068414.7A CN201610068414A CN105508479B CN 105508479 B CN105508479 B CN 105508479B CN 201610068414 A CN201610068414 A CN 201610068414A CN 105508479 B CN105508479 B CN 105508479B
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- diamond alkene
- nanometer diamond
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Compositions of linings; Methods of manufacturing
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B20/00—Use of materials as fillers for mortars, concrete or artificial stone according to more than one of groups C04B14/00 - C04B18/00 and characterised by shape or grain distribution; Treatment of materials according to more than one of the groups C04B14/00 - C04B18/00 specially adapted to enhance their filling properties in mortars, concrete or artificial stone; Expanding or defibrillating materials
- C04B20/02—Treatment
- C04B20/026—Comminuting, e.g. by grinding or breaking; Defibrillating fibres other than asbestos
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B28/00—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements
- C04B28/24—Compositions of mortars, concrete or artificial stone, containing inorganic binders or the reaction product of an inorganic and an organic binder, e.g. polycarboxylate cements containing alkyl, ammonium or metal silicates; containing silica sols
- C04B28/26—Silicates of the alkali metals
Abstract
The invention belongs to high-abrasive material technical field, specifically discloses a kind of high abrasion high heat conduction brake block, including base steel sheet, and base steel sheet is provided with brake pad, and brake pad includes the basalis to connect with base steel sheet, and basalis is provided with diamond alkene frictional layer；Diamond alkene frictional layer is made up of the nanometer diamond alkene of lamellar mono-crystalline structures；It is sp3 orbital hybridization carbon key connections between the carbon atom of the same lamella of nanometer diamond alkene, is sp2 hydridization carbon key connections between carbon atom between layers；The spacing of lattice of nanometer diamond alkene is 0.21nm；The average grain diameter of nanometer diamond alkene is R, 20≤R≤500nm；The C content of nanometer diamond alkene is 99~100%.Wearability of the present invention is high, heat conduction is good and hardness is high.
Description
Technical field
The invention belongs to high-abrasive material technical field, is related to a kind of brake block, and more particularly to a kind of high abrasion high heat conduction is stopped
Car piece and preparation method.
Background technology
In the brake system of automobile, electric car etc., brake block is the most key breaking piece, while brake block is also
One of part most easy to wear, the quality of brake block play conclusive effect to braking effect, it may be said that are that brake block is car
With " patron saint " of people.Brake block structure is typically made up of steel plate, bonding thermal insulation layer and brake pad etc., as shown in figure 1, wherein rubbing
Cleaning block is made up of friction material and bonding agent, and brake block, which is extruded on brake disc or brake rim, during brake produces friction, from
And reach the purpose of vehicle deceleration.Due to rubbing action, brake pad can gradually be worn, and reduce the coefficient of friction of brake block,
The coefficient of friction of brake block determines the size of vehicle braking force, and the coefficient of friction of brake block, which reduces, can cause vehicle braking force
Decline, add the braking distance of vehicle, certain threat is constituted to personal safety.Brake block can be with brake during braking automobile
Disk or brake rim produce very big friction, and friction can produce certain heat, and brake-pad friction block is typically all on the market at present
The poor material of thermal conductivity is formed, if these heats disperse not in time, will be assembled on brake block so that and brake block softens,
The braking ability of brake block is greatly reduced, wants to reach same braking effect, it is necessary to which repeatedly brake, this creates the terminal more
More heats, brake failure is may result in when brake block reaches certain temperature, greatly threatens the life peace of passengers inside the car
Entirely.The heat on brake block can be also delivered on caliper and its component and brake fluid simultaneously, can accelerate the old of brake caliper assemblies
Change and cause brake fluid boiling, reduce braking effect.
The content of the invention
It is an object of the invention to provide a kind of wearability is high, the high abrasion high heat conduction brake block that heat conduction is good and hardness is high and
Preparation method.
To achieve the above object, the present invention uses following technical scheme：A kind of high abrasion high heat conduction brake block, including substrate
Steel plate, base steel sheet are provided with brake pad, and brake pad includes the basalis to connect with base steel sheet, and basalis is provided with diamond alkene
Frictional layer；Diamond alkene frictional layer is made up of the nanometer diamond alkene of lamellar mono-crystalline structures；The carbon of the same lamella of nanometer diamond alkene is former
It is sp between son3Orbital hybridization carbon key connection, it is sp between carbon atom between layers2Hydridization carbon key connection；Nanometer diamond alkene
Spacing of lattice be 0.21nm；The average grain diameter of nanometer diamond alkene is R, 20≤R≤500nm；The C content of nanometer diamond alkene is 99
~100%.
Further, diamond alkene frictional layer is by average grain diameter（10-20）nm、（100-250）nm、（350-500）Nm's
Three kinds of nanometer diamond alkene are made and the weight ratio of three kinds of nanometer diamond alkene is（1-2）:（3-4）:（4-5）.
Further, the thickness of diamond alkene frictional layer is 2-4cm.
The preparation method of high abrasion high heat conduction brake block： 1）Choosing average grain diameter is respectively（10-20）nm、（100-250）
nm、（350-500）Nm three kinds of nanometer diamond alkene, weight ratio are（1-2）:（3-4）:（4-5）, mix；2）Add and step 1）
The weight of nanometer diamond alkene after mixing stirs 30-60min than the sodium silicate aqueous solution for 6%；3）Baking is put into after pressing mold shaping
Case carries out staged baking, and diamond alkene frictional layer is made；4）By diamond alkene frictional layer bonding on the base layer, brake pad is formed,
Brake pad is bonded in base steel sheet again, finished product.
Further, step 3）Middle staged baking procedure is as follows：A, 60 DEG C are warming up to from normal temperature, are incubated 30min；B, from
60 DEG C are warming up to 80 DEG C, are incubated 30min；C, 120 DEG C are warming up to from 80 DEG C, is incubated 60min；D, 180 DEG C are warming up to from 120 DEG C,
200min is incubated, cools to normal temperature, completes baking process；Heating rate is 2 DEG C/min in above-mentioned steps.
The preparation technology of nanometer diamond alkene, comprises the following steps：
Pickling purifies：Diamond raw material is ground into fine powders more than 8000 mesh, mixed successively using the concentrated sulfuric acid and concentrated nitric acid
Liquid, watery hydrochloric acid, hydrofluoric acid are closed to the fine powder pickling, is then cleaned using deionized water to cleaning fluid pH close to 7；Sorting：Will
Material after cleaning is centrifuged, and takes supernatant liquid to carry out precipitation sorting in 1-5 days, supernatant liquor is removed, by lower sediment
Thing gets product nanometer diamond alkene after drying.
Ball milling shaping and air-flow are carried out before acid pickling step to crush, and first by diamond raw material ball milling shaping and screen out 800 mesh
Fines above；The fines is delivered to the fine powder for crushing and screening out in air-flow disintegrating machine and be more than 8000 mesh again.
In ball milling shaping step, screen cloth of the diamond through ball milling shaping barrel sifts out particles more than 70 mesh, and the broken time is
1-5h；The particle screens out fineves more than 800 mesh through multistage vibrating sieving machine, and the sieve time of shaking is 30min-2h；Walked in ball milling shaping
Suddenly, fineves more than 800 mesh screened out repeats more than sieving once；Coarse fodder below ball milling shaping step, 70 mesh returns
Ball milling shaping barrel is crushed again；Residue on sieve Returning flow disintegrating machine is crushed again；In sorting step, centrifugation time is
30min-2h, rotating speed 8000rpm-15000rpm；The concentrated sulfuric acid is 98% concentrated sulfuric acid and matter by mass fraction with concentrated nitric acid mixed liquor
Amount fraction is that 10% concentrated nitric acid according to mass ratio is 5:1 mixes；The nanometer diamond alkene prepared using the above method, is synusia
Shape mono-crystalline structures, it is sp between the carbon atom of same lamella3Orbital hybridization carbon key connection, it is between carbon atom between layers
sp2Hydridization carbon key connection；Granularity is 20-500nm, and C content is 99~100%, spacing of lattice 0.21nm.
Compared with prior art, beneficial effects of the present invention are as follows：From of different sizes and different proportion diamond alkene
Purpose is just so that diamond alkene frictional layer is fine and close, and friction effect is good；Diamond alkene is the super hard nano material that diamond is formed, and it has
There is the advantages of hardness is high, wearability is high, thermal conductivity is high, diamond alkene has wearability high, scattered as the frictional layer of automobile brake sheet
The characteristics of hot high, the rate of heat dissipation of diamond alkene is the highest in known materials, caused by the friction with brake disc or brake rim
Heat will soon be diffused in the air of surrounding so that heat can not be assembled on brake block, while have wearability high
Advantage, the coefficient of friction of automobile brake sheet is improved, improves the braking ability of automobile, improve the service life of brake block,
Simultaneously compared with semipermanent mold brake block, noise substantially reduces, and due to not having metal in frictional layer, the abrasion to brake disc is also big
It is big to reduce.
Brief description of the drawings
Fig. 1 is the structural representation of embodiment 1 in the present invention；
Fig. 2 is the XRD spectra of nanometer diamond alkene；
Fig. 3 is the tem analysis figure of nanometer diamond alkene；
Fig. 4 is the MAS-NMR spectrograms of nanometer diamond alkene；
Fig. 5 is the atomic orbital schematic diagram of nanometer diamond alkene；
Fig. 6 is the Raman spectrum of nanometer diamond alkene；
Fig. 7 be stable friction factor experiment in test 1 group 2 effect, 3 effect potency test curve maps；
Fig. 8 be stable friction factor experiment in test 2 groups 2 effect, 3 effect potency test curve maps.
Embodiment
Embodiment 1
A kind of high abrasion high heat conduction brake block, as shown in figure 1, including base steel sheet 1, base steel sheet 1 is provided with brake pad,
Brake pad includes the basalis 2 to connect with base steel sheet 1, and basalis 2 is provided with diamond alkene frictional layer 3；Diamond alkene frictional layer 3 by
The nanometer diamond alkene of lamellar mono-crystalline structures is made；It is sp between the carbon atom of the same lamella of nanometer diamond alkene3Orbital hybridization carbon
Key connection, it is sp between carbon atom between layers2Hydridization carbon key connection；The spacing of lattice of nanometer diamond alkene is 0.21nm；
The C content of nanometer diamond alkene is 99~100%.Diamond alkene frictional layer 3 is received by three kinds of average grain diameter for 20nm, 200nm, 500nm
Rice diamond alkene is made and the weight ratio of three kinds of nanometer diamond alkene is 2:3:5.The thickness of diamond alkene frictional layer 3 is 2cm.
Embodiment 2
A kind of high abrasion high heat conduction brake block, including base steel sheet, base steel sheet are provided with brake pad, brake pad include with
The basalis that base steel sheet connects, basalis are provided with diamond alkene frictional layer；Diamond alkene frictional layer is by lamellar mono-crystalline structures
Nanometer diamond alkene is made；It is sp between the carbon atom of the same lamella of nanometer diamond alkene3Orbital hybridization carbon key connection, between layers
Carbon atom between be sp2Hydridization carbon key connection；The spacing of lattice of nanometer diamond alkene is 0.21nm；The C content of nanometer diamond alkene
For 99~100%.Diamond alkene frictional layer is made up and three kinds of three kinds of nanometer diamond alkene that average grain diameter is 10nm, 100nm, 400nm
The weight ratio of nanometer diamond alkene is 2:4:4.The thickness of diamond alkene frictional layer is 4cm.
Embodiment 3
A kind of high abrasion high heat conduction brake block, including base steel sheet, base steel sheet are provided with brake pad, brake pad include with
The basalis that base steel sheet connects, basalis are provided with diamond alkene frictional layer；Diamond alkene frictional layer is by lamellar mono-crystalline structures
Nanometer diamond alkene is made；It is sp between the carbon atom of the same lamella of nanometer diamond alkene3Orbital hybridization carbon key connection, between layers
Carbon atom between be sp2Hydridization carbon key connection；The spacing of lattice of nanometer diamond alkene is 0.21nm；The C content of nanometer diamond alkene
For 99~100%.Diamond alkene frictional layer is made up and three kinds of three kinds of nanometer diamond alkene that average grain diameter is 20nm, 250nm, 350nm
The weight ratio of nanometer diamond alkene is 1:3:4.The thickness of diamond alkene frictional layer is 3cm.
Embodiment 4
The preparation method of high abrasion high heat conduction brake block： 1）It is respectively 20nm, 200nm, 500nm to choose average grain diameter
Three kinds of nanometer diamond alkene, weight ratio are 2:3:5, mix；2）Add and step 1）The weight ratio of nanometer diamond alkene after mixing is
6% sodium silicate aqueous solution, stir 60min；3）Baking oven is put into after pressing mold shaping and carries out staged baking, and diamond alkene friction is made
Layer；4）By diamond alkene frictional layer bonding on the base layer, brake pad is formed, then brake pad is bonded in base steel sheet, be made
Finished product.Step 3）Middle staged baking maximum temperature is 180 DEG C, and staged baking procedure is as follows：A, 60 DEG C are warming up to from normal temperature,
It is incubated 30min；B, 80 DEG C are warming up to from 60 DEG C, is incubated 30min；C, 120 DEG C are warming up to from 80 DEG C, is incubated 60min；D, from 120
180 DEG C DEG C are warming up to, is incubated 200min, cools to normal temperature, completes baking process；Heating rate is 2 DEG C/min in above-mentioned steps.
Embodiment 5
The preparation method of high abrasion high heat conduction brake block： 1）It is respectively 10nm, 100nm, 350nm to choose average grain diameter
Three kinds of nanometer diamond alkene, weight ratio are 2:4:4, mix；2）Add and step 1）The weight ratio of nanometer diamond alkene after mixing is
6% sodium silicate aqueous solution, stir 30min；3）Baking oven is put into after pressing mold shaping and carries out staged baking, and diamond alkene friction is made
Layer；4）By diamond alkene frictional layer bonding on the base layer, brake pad is formed, then brake pad is bonded in base steel sheet, be made
Finished product.Step 3）Middle staged baking procedure is as follows：A, 60 DEG C are warming up to from normal temperature, are incubated 30min；B, 80 are warming up to from 60 DEG C
DEG C, it is incubated 30min；C, 120 DEG C are warming up to from 80 DEG C, is incubated 60min；D, 180 DEG C are warming up to from 120 DEG C, is incubated 200min, drop
Temperature arrives normal temperature, completes baking process；Heating rate is 2 DEG C/min in above-mentioned steps.
The performance test of the present invention is as follows：
Contrast two kinds of automobile brake sheet in the market, semimetal class vehicle brake-holder block and resinae automobile brake
Two kinds of piece.From thermal diffusivity, for the degree of wear of brake disc, abrasion of the semimetal class vehicle brake-holder block to brake disc is very big,
Brake disc is easy to be worn, but thermal diffusivity is strong compared with resinae vehicle brake-holder block, and heat is not easy to assemble on brake(-holder) block, easily
Diverging, abrasion very little of the resinae vehicle brake-holder block to brake disc, but poor radiation, in brake process caused heat without
Method is exhaled in time, causes brake-block temperature to raise so that brake block braking ability is drastically reduced, it is necessary to continuous prolonged
Braking, brings greatly potential safety hazard.Nanometer diamond alkene has the advantages of wear-resisting, thermal transpiration is high, and to be nonmetallic, can be significantly
Extend the service life of automobile brake sheet, and caused heat is also easily dissipated away in brake process, will not be caused
Substantial amounts of heat is poly- to be stayed on brake block, causes the reduction of brake block braking ability, meanwhile, in brake process, nanometer diamond alkene
Surface has part nanometer diamond alkene and changes into graphite, and graphite is good lubricant, is maintaining stronger coefficient of friction
At the same time it can also slow down the abrasion to brake disc, the service life of a whole set of brake gear is extended.
Friction and wear test is carried out according to GB5763-1998 on JF150D type fixed speed fricting test machines, is connect using disk-block
The form of touching, mating plate are Φ 300mm disk, and material is gray cast iron.Brake block from embodiment 1 is 1 group of experiment, commercially available general
Logical brake block is 2 groups of experiment, and specimen size is 25mm × 25mm × 6mm, and 25mm × 25mm faces are as rubbing surface.Experimental condition
For：Disc rotation speed is 480r/min, thrust 0.98MPa, and total revolution is 5000 r, and test temperature is respectively 100 DEG C, 150
DEG C, 200 DEG C, 250 DEG C, 300 DEG C, 350 DEG C, the front and rear thickness for using precision as 0.01mm micrometer caliper measurement brake(-holder) block of experiment
Degree, its arithmetic mean of instantaneous value is taken to calculate wear rate.
The brake block polishing machine of table 1 tests table
As can be seen from the above table, either the wear rate of the stability of coefficient of friction or material, 1 group of experiment are superior to
Test 2 groups.In temperature-rise period from 200 DEG C to 350 DEG C, 2 groups of experiment generates larger heat fading, and coefficient of friction is by 200 DEG C
0.44 be reduced to 350 DEG C 0.34, fall to 22.7%, and test 1 group be embodiment 1 brake block then due to radiating
Property it is good and coefficient of friction is relatively stable, and wear rate is superior to common commercially available brake block under condition of different temperatures, due to nanometer
Diamond alkene wearability is high, and the anti-wear performance of automobile brake sheet has been significantly increased.
According to automobile industry standard QC/T 564-2008 1 is carried out on JF122 brake inertia platform experiment machines:1 stand is real
Test, speed takes 50 respectively, 100,130km/h, brake-pipe pressure 2,4,6,8,10MPa, to investigate brake block not synchronized
The stability of degree, coefficient of friction under different pressures, from embodiment 2 brake block as 1 group of experiment, common commercially available brake block
As testing 2 groups, respectively as shown in Figure 7, Figure 8, we can be significantly from figure for 2 effects of two kinds of brake blocks, 3 effect trial curves
Find out, the brake block of 2 groups compared with experiment of the efficacy curve of the brake block of 1 group of experiment is stable, the brake block coefficient of friction of 1 group of experiment
Stability shows the correlation of good speed and pressure apparently higher than 2 groups of brake block of experiment.
The performance test of nanometer diamond alkene is as follows：
（1）XRD analysis
Fig. 2 is a:Explosion method Nano diamond；b：Nanometer diamond alkene in the present invention；c：Graphite；d：The XRD spectrums of graphene
Figure.
From Fig. 2 XRD spectra, pass through x-ray powder diffraction instrument (Cu K alpha rays, tube voltage 40Kv, tube current
40mA, λ=1.54056) test shows that nanometer diamond alkene of the invention can see non-in θ=43.93 ° of the angle of diffraction 2 and 75.3 °
Normal significantly diffraction maximum, it is corresponding with typical diamond phase (111), (220) crystal face, the novel nano of the present invention can be proved
Diamond alkene is the carbon nanosheet for having diamond phase structure, while it can be seen that the novel nano of the present invention from XRD spectra
The diffracted intensity of the diffracted primary peak (111 crystal face) of diamond alkene is much larger than the Nano diamond of explosion method synthesis, illustrates the present invention's
Diamond alkene crystallinity is strong more than the Nano diamond that explosion method synthesizes.Simultaneously it can be seen that graphene and graphite the θ of the angle of diffraction 2=
26.4 ° can see that significantly diffraction maximum, corresponding with typical graphene and graphite (002) crystal face, the Performances of Novel Nano-Porous with the present invention
Rice diamond alkene goes out peak position difference, and mutually to form be not for the novel nano diamond alkene of this explanation present invention and the thing of graphite, graphene
With, graphite, the main diffraction maximum of graphene go out peak position for 26.4 °, and corresponding crystal face be (002), this and brill of the invention
Stone alkene is also different.According to Scherrer formula D=K γ/(β cos θ), K is constant, and β is halfwidth, and diamond alkene of the invention is brilliant
Grain size is 5 times or so of the Nano diamond of explosion method synthesis, it means that diamond alkene of the invention is on atomic structure of carbon
Distort very little, crystallinity is good because the smaller easier generation distortion of lattice of crystal grain, this for expand nanometer diamond alkene application
Scope is advantageously.
（2）Tem analysis
Fig. 3 is a：Explosion method Nano diamond；b：The novel nano diamond alkene of the present invention；c：Graphite；d：The TEM of graphene
Analysis chart.A1, b1, c1, d1 respectively corresponding a, b, c, d partial enlarged drawing, the respectively corresponding a, b of a2, b2, c2, d2,
C, d HRTEM figures, a1, b1, c1, d1 upper left corner illustration are that corresponding SAED schemes.
By Fig. 3 it is apparent that the pattern of the nanometer diamond alkene of the present invention is different from other carbon materials, and it is one
Kind multilayer chip structure, from the SAED figures in the b1 figures upper left corner it will be seen that the diamond alkene of the present invention is a kind of mono-crystalline structures,
And the particle that Nano diamond prepared by explosion method is reunion forms, and it is polycrystalline structure, graphite and graphene are sheet
Structure, this laminated structure is different from the diamond alkene of the present invention, and the length of a film of diamond alkene of the invention is between 200-500nm, stone
The length of a film of ink and graphene is more than 10 μm, and thickness is also thicker than graphite, graphene.Scheming us from SAED can also
Go out, although monocrystalline electronic diffraction is all presented, the SAED figures of graphite and graphene are the SAED figures of typical hexaplanar, different
In diamond alkene prepared by the present invention, the diamond alkene of this explanation present invention has different crystal structures from graphite, graphene.
From HRTEM figures it can be seen that spacing of lattice is 0.21nm, with diamond phase (111) crystal face spacing of lattice
0.206nm is approached, and this illustrates that the product of this laminated structure is along (111) crystal face, and we can also be seen that from figure
Nanometer diamond alkene dispersiveness will get well more than Nano diamond prepared by explosion method, and specific surface area is big, is more prone on the surface
Other functional groups are adsorbed, so as to realize the functionalization to diamond surface, expand its application.
（3）MAS NMR are analyzed
Fig. 4 is a：Nanometer diamond alkene, the b of the present invention：The MAS NMR analyses of explosion method Nano diamond.
Nanometer diamond alkene of the invention be layer structure as seen from Figure 4, the Nano diamond that explosion method synthesizes be by
What two kinds of different carbon C1 and C2 were formed, wherein C1 carbon goes out that peak position is different with diamond alkene of the invention, and this illustrates both
There is certain difference for carbon atom arrangement inside Nano diamond.The nanometer diamond alkene of the present invention is with sp3Track is miscellaneous
Change carbon and sp2Two kinds of different carbon structures of orbital hybridization carbon, it is sp between the carbon atom of same lamella3Orbital hybridization carbon key connection,
It is sp between carbon atom between layers2Hydridization carbon key connection, make have many electron vacancys, electron vacancy side between layers
Just electronics freely comes in and goes out, wherein, as shown in figure 5, sp3Orbital hybridization carbon is the hydridization carbon of stereochemical structure, sp2Orbital hybridization carbon is
The carbon structure of this Nano diamond synthesized from explosion method of the hydridization carbon of planar structure is different.And graphene has one kind two
Crystal structure is tieed up, the hexagon that its lattice is made up of six carbon atom, the combination between carbon atom is sp2Track is miscellaneous
Change, graphite is the hexagon of the six carbon atom composition of same layer, is sp with the combination between the carbon atom of layer2Orbital hybridization
Chemical bond is formed, and connected by Van der Waals force between layers, the carbon atom in nanotube is with sp2Based on orbital hybridization,
Simultaneously also there is certain bending, certain sp can be formed3Hybrid bond, i.e., the chemical bond formed in same flexure plane is simultaneously
With sp2And sp3Mixed hybridization state, the carbon atom arrangement of these carbon materials are different from the nanometer diamond alkene of the present invention.
（4）Raman spectrum analyses
Fig. 6 is the Raman spectrograms of nanometer diamond alkene,（a）Particle diameter 250nm；（b）Particle diameter 200nm；（c）Particle diameter 100nm；
（d）Particle diameter 50nm.
From fig. 6, it can be seen that the diamond alkene of the layer structure of the different-grain diameter of synthesis has the nanogold that explosion method synthesizes
The similar Raman spectrograms of hard rock, but be different from, with the change of sample particle diameter, Raman spectrograms also occur
The intensity at regular change, two main peak D peaks and G peaks is gradually weakening, and this sends out mainly due to the structure of sample itself
Change, sp are given birth to2Carbon and sp3Two kinds of carbon atoms of carbon constitute a kind of special dimeric structure, with the change of sample particle diameter,
Gradually increase causes two main diffraction peak intensities gradually to weaken to this special dimeric structure content.
Claims (2)
1. the preparation method of high abrasion high heat conduction brake block, it is characterised in that：1）Choosing average grain diameter is respectively（10-20）nm、
（100-250）nm、（350-500）Nm three kinds of nanometer diamond alkene, weight ratio are（1-2）:（3-4）:（4-5）, mix；2）Add
With step 1）The weight of nanometer diamond alkene after mixing stirs 30-60min than the sodium silicate aqueous solution for 6%；3）Pressing mold is molded
After be put into baking oven and carry out staged baking, nanometer diamond alkene frictional layer is made；4）Nanometer diamond alkene frictional layer is bonded in substrate
On layer, brake pad is formed, then brake pad is bonded in base steel sheet, finished product；Nanometer diamond alkene frictional layer is by lamellar
The nanometer diamond alkene of mono-crystalline structures is made；It is sp between the carbon atom of the same lamella of nanometer diamond alkene3Orbital hybridization carbon key connection,
It is sp between carbon atom between layers2Hydridization carbon key connection；The spacing of lattice of nanometer diamond alkene is 0.21nm；Nanometer diamond
The average grain diameter of alkene is R, 20≤R≤500nm；The C content of nanometer diamond alkene is 99~100%.
2. the preparation method of high abrasion high heat conduction brake block as claimed in claim 1, it is characterised in that：Step 3）Middle staged
Baking procedure is as follows：A, 60 DEG C are warming up to from normal temperature, are incubated 30min；B, 80 DEG C are warming up to from 60 DEG C, is incubated 30min；C, from 80
120 DEG C DEG C are warming up to, is incubated 60min；D, 180 DEG C are warming up to from 120 DEG C, is incubated 200min, cools to normal temperature, completes Roaster
Skill；Heating rate is 2 DEG C/min in above-mentioned steps.
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|---|---|---|---|---|
| IL145183A0 (en) * | 2001-08-29 | 2002-06-30 | Yeda Res & Dev | Direct surface patterning of carbon |
| CN1798880A (en) * | 2003-05-30 | 2006-07-05 | 独立行政法人科学技术振兴机构 | Process for producing extremely flat microcrystalline diamond thin film by laser ablation method |
| CN101728449A (en) * | 2008-10-31 | 2010-06-09 | 宋健民 | Diamond-like carbon electronic device and manufacturing method thereof |
| CN204961650U (en) * | 2015-07-30 | 2016-01-13 | 王攀 | High strength brake block |
| CN105253883B (en) * | 2015-09-25 | 2017-09-15 | 郑州华晶金刚石股份有限公司 | A kind of nanometer diamond alkene of the layer structure of controllable type |
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2016
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