CN107605948A - A kind of composite sliding bearing and preparation method thereof - Google Patents
A kind of composite sliding bearing and preparation method thereof Download PDFInfo
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- CN107605948A CN107605948A CN201711118509.6A CN201711118509A CN107605948A CN 107605948 A CN107605948 A CN 107605948A CN 201711118509 A CN201711118509 A CN 201711118509A CN 107605948 A CN107605948 A CN 107605948A
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Abstract
A kind of compound guide bearing and preparation method thereof, foamed aluminium is surface-treated after degreasing, alkali cleaning and pickling using silane coupler；Foamed aluminium after upper step process deposits one layer of sulfonated graphene by hole surface of the electro-deposition method in foamed aluminium；Foamed aluminium after deposition sulfonated graphene is fitted into injection mold, and wear-resistant plastic is molded using Shooting Technique, is cooled and shaped；Wear-resistant plastic includes at least one of polyformaldehyde, polyether-ether-ketone, polyphenylene sulfide, polytetrafluoroethylene (PTFE), ultra-high molecular weight polyethylene；Foamed aluminium before degreasing is made by fine aluminium and/or alusil alloy after foaming, and it has full communicating hole system, and porosity is 60%~80%, and aperture is 2~4mm.Technical scheme proposed by the present invention, between foamed aluminium and polymer two-phase interface, sulfonated graphene transition zone is introduced by electrodeposition process, efficiently solves foamed aluminium and polymeric material interface degumming caused by thermal coefficient of expansion difference, the technical problems such as interface resistance is big.
Description
Technical field
The present invention relates to green wood material products and self-lubricating bearing preparing technical field, more particularly, to a kind of composite slide axle
Hold；The invention further relates to a kind of production method of composite sliding bearing and its application.
Background technology
Bearing is the important spare part in plant equipment.Its major function is the mechanical rotary body of support, reduces its motion
During coefficient of friction, and ensure its rotating accuracy.By the difference of motor element frictional property, bearing can be divided into rolling bearing
With the major class of sliding bearing two.Wherein rolling bearing is normalized, seriation, the radial ruler of rolling bearing compared with sliding bearing
Very little, vibration and noise are larger, and price is also higher.
Oil-free lubrication sliding bearing in the market is mainly that copper alloy adds graphite, and its structure is bored on copper alloy
Hole, fills graphite in hole, and bearing is to realize its self-lubricating property by graphite in hole in the course of the work.Due to copper and graphite
All there is good heat conductivility, therefore, this kind of bearing has good heat endurance, can be useful under higher temperature operating mode and transport
OK.But because of the discontinuity of graphite in hole, and the hardness of copper alloy is higher than general high polymer material, therefore, this kind of bearing
Self-lubricating property it is poorer than Full-plastic type, running noise is larger, and it is also larger to the abrasion with width part.
With machine at a high speed, accurate, low noise direction develop, the also more and more higher of the requirement to sliding bearing, especially
Ask bearing that there is good heat conduction and heat dispersion, good heat endurance.Therefore, there is excellent self-lubricating and thermal stability
Polymer composite and research to composite sliding bearing turn into one of focus with application.
At present, the main method for improving high polymer material thermal conductivity is to introduce high heat conduction filler wherein, i.e., so-called to fill out
Type heat-conducting polymer material is filled, it relies on phonon thermal conductance, and thermal conductivity factor depends on the association of high polymer material matrix and heat filling
Same-action.However, because the distribution of filler is random, the heat conduction network that is formed is simultaneously discontinuous, numerous breakpoints be present, and lead
Ther mal network is in anisotropy, and heat conductivility quality depends on most short heat conduction network, therefore is made to improving thermal conductivity of material
With limited.
The metal for having cavity is referred to as foam metal or foaming metal, such as foaming aluminum, Foamed Nickel, foam copper.Foamed aluminium
It is after adding additive in pure aluminum or aluminum alloy, to be formed by foam process, because it has special loose pore space structure,
Density is small, light weight, specific surface area are big, than high mechanical properties, has many unique performances, such as：Good sound absorption, sound insulation,
The performances such as electromagnetic shielding, damping, damping.But single foamed aluminium is there is also the defects of performance, as intensity, modulus are relatively low, and
It can not be used separately as structural material.
Polymer, also referred to as high polymer material, there is the characteristic that can not compare of many metals, it is such as high than by force, it is low-density, resistance to
Burn into has self-lubricating property and good processing characteristics.But it also has deficiency, such as heat conduction and poor heat resistance, poorly conductive.
The materials such as foamed aluminium and polymer are combined, the excellent foamed aluminium/polymer composites of processability into
For the focus of research.Such as CN102501357A discloses a kind of polymer/foamed aluminium composite material and its production method, will steep
In foam aluminium insertion mould；Polymer/foamed aluminium composite material is made by injection moulding method in polymer or blend；Will be poly-
Polymer melt is filled with the hole of foamed aluminium, forms the composite being made up of foamed aluminium and polymer.In addition, also by oozing
Platen press prepares the report of the thermosets filled and process aluminium composite material such as silicon rubber, epoxy resin.But prior art manufacture should
During class composite, because the thermal coefficient of expansion gap of certain gas, foamed aluminium and polymeric material can be produced after chemical reaction
The reason such as larger, on the one hand easily make the interface degumming of composite, interface resistance increase, heat conductivility improvement is weakened；
On the other hand, the product obtained is not fine and close, performance existing defects, so the process scope of application is relatively limited.
The content of the invention
For overcome the deficiencies in the prior art, present invention solves the technical problem that being to provide a kind of coefficient of friction low, resistance to
The composite sliding bearing and its preparation side that mill property is good, self-lubricating property is excellent, intensity is high, dimensional stability and heat endurance are good
Method.
In order to solve the above-mentioned technical problem, on the one hand, the present invention provides a kind of composite sliding bearing, through following methods system
：After foamed aluminium passes sequentially through degreasing, alkali cleaning and pickling, it is surface-treated using silane coupler；After upper step process
Foamed aluminium by electro-deposition method foamed aluminium hole surface deposit one layer of sulfonated graphene；Bubble after above-mentioned steps are handled
Foam aluminium is fitted into injection mold, and wear-resistant plastic is molded using Shooting Technique, is cooled and shaped；Foamed aluminium before degreasing is with complete
The hole system of full-mesh, porosity are 60%~80%, and aperture is 2~4mm foamed aluminium.
As further improved technical scheme, composite sliding bearing provided by the invention, the sulfonated graphene is to adopt
With Hummers methods, the graphene as made from graphite oxidized stripping reduction, it is made after graphenic surface modifies sulfonic group
Sulfonated graphene.
As preferable technical scheme, composite sliding bearing provided by the invention, the sulfonated graphene is use
Hummers methods, the graphene as made from graphite oxidized stripping reduction, graphene enter after sodium borohydride carries out prereduction
The sulfonated processing of row, then using obtained sulfonated graphene after hydrazine progress secondary reduction.
In order to solve the above-mentioned technical problem, on the other hand, the present invention provides a kind of composite sliding bearing preparation method, including
Following steps：After foamed aluminium passes sequentially through degreasing, alkali cleaning and pickling, it is surface-treated using silane coupler；Through upper step
Foamed aluminium after processing deposits one layer of sulfonated graphene by hole surface of the electro-deposition method in foamed aluminium；Deposit one layer of sulfonation stone
Foamed aluminium after black alkene is fitted into injection mold, and wear-resistant plastic is molded using Shooting Technique, is cooled and shaped；The wear-resistant plastic
Including at least one of polyformaldehyde, polyether-ether-ketone, polyphenylene sulfide, polytetrafluoroethylene (PTFE), ultra-high molecular weight polyethylene；Before degreasing
Foamed aluminium is made by fine aluminium and/or alusil alloy after foaming, and it has a full communicating hole system, and porosity is 60%~
80%, aperture is 2~4mm.After foamed aluminium passes sequentially through degreasing, alkali cleaning and pickling, it is surface-treated using silane coupler,
Preferably technique is：After degreasing being carried out to foamed aluminium, first alkali cleaning 4~6 minutes in the 3wt%~8wt% NaOH aqueous solution, then
3wt%~8wt% HCI aqueous acid mediums are washed 4~6 minutes, then the flushing liquor of foamed aluminium is placed in 80 in neutrality with water flushing
Dried at a temperature of~100 DEG C；It is surface-treated with foamed aluminium weight 1wt%~3wt% silane coupler hydrolyzate；Exist again
Dried at a temperature of 80~100 DEG C.
As further improved technical scheme, composite sliding bearing preparation method provided by the invention is described in foam
The hole surface of aluminium, which deposits one layer of sulfonated graphene preparation process, to be included using dc source, and graphite electrode connects positive pole, and workpiece connects negative
Pole, in graphene sulfonated graphene-aqueous dispersions that concentration is 100mg~300mg/L, temperature is 20~40 DEG C deposit 2~
5min。
As further improved technical scheme, composite sliding bearing preparation method provided by the invention, the sulfonation stone
Black alkene is using Hummers methods, the graphene as made from graphite oxidized stripping reduction, sulfonic acid is modified in graphenic surface
Obtained sulfonated graphene after base.
As further improved technical scheme, composite sliding bearing preparation method provided by the invention, the sulfonation stone
Black alkene is using Hummers methods, and the graphene as made from graphite oxidized stripping reduction, graphene is carried out through sodium borohydride
After prereduction, sulfonated processing is carried out, then using obtained sulfonated graphene after hydrazine progress secondary reduction.
As further improved technical scheme, composite sliding bearing preparation method provided by the invention, in addition to will be through
Foamed aluminium after deposition sulfonated graphene processing makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
As further improved technical scheme, composite sliding bearing preparation method provided by the invention, the injection work
Skill condition is：190 DEG C of barrel temperature, 100 DEG C, 70~110MPa of injection pressure of mold temperature, injection rate 90%, injection time
30 seconds, dwell pressure 90MPa, 30 seconds dwell times.
As further improved technical scheme, composite sliding bearing preparation method provided by the invention is described to be cooled to
Type process is included at a temperature of 50~80 DEG C, is incubated 2~3h, then naturally cools to room temperature.
Composite sliding bearing provided by the invention, the material used is foamed aluminium/polymer three-dimensional IPN composite, material
Material density is 1.0~1.5g/cm3, non-notch impact strength is 130~190KJ/m2, compression strength is 16~22MPa, heat conduction
Coefficient is 2.1~2.4W/ (mK)-1, excellent performance.
The beneficial effect that the present invention is brought：Technical scheme proposed by the present invention, foamed aluminium and polymer two-phase interface it
Between, sulfonated graphene transition zone is introduced by electrodeposition process, efficiently solves foamed aluminium with polymeric material because of thermal expansion system
Interface degumming caused by number is different, the technical problems such as interface resistance is big, so as to obtain the foam of structural integrity, function admirable
Aluminium/polymer three-dimensional IPN composite sliding bearing.Foamed aluminium/polymer three-dimensional IPN composite wood prepared by relatively existing method
Sulfonated graphene transition zone is contained in material, product prepared by this method, its inside, and plastic-aluminum interface cohesion is good, no fault of construction, because
This its thermal conductivity factor is up to 2.1~2.4W/ (mK)-1, and possess the premium properties such as wear-resisting, self-lubricating, intensity height.
Composite sliding bearing tribological property provided by the invention is excellent, and can realize oil-free lubrication, therefore, has environment
The characteristics of friendly, application value protrudes.
Embodiment
Embodiment is used for providing a further understanding of the present invention, forms the part of the application, embodiments of the invention
And its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.
According to the following steps sulfonated graphene is prepared with material ratio：
S1：Under the conditions of ice-water bath, 10g crystalline flake graphites are slowly added into the 230mL concentrated sulfuric acids, then add 5g sodium nitrate and 30g
Potassium permanganate, continue stirring reaction 2h under the conditions of ice-water bath；
S2：Material after S1 step reactions are terminated is moved in 35 DEG C of water bath with thermostatic control, reacts 30min；It is then slowly added to
460mL deionized water and 50mL H2O2；Reaction is first washed 4 to 5 times after terminating with 5wt% HCl, then with deionized water repeatedly
Washing to neutrality, products therefrom is made graphite oxide after being dried in vacuo 24h at 60 DEG C, is sealed standby；
S3：The graphite oxide 150mg for taking S2 steps to obtain is scattered in 150ml deionized waters, sonicated 2h, obtains 1mg/
ML graphene oxide suspensions；
S4：In the graphene oxide suspension that S3 steps obtain add 5wt% aqueous sodium carbonate, regulation pH 9~10 it
Between；The sodium borohydride for then weighing 1200mg is dissolved in 30mL deionized water, is poured into graphene oxide dispersion, at 80 DEG C
Oil bath under the conditions of stirring reaction 1h；
S5：The dispersion liquid obtained using centrifuge to S4 steps is centrifuged, and obtains the graphene oxide of partial reduction；Will
Products therefrom is scattered in 150mL deionized waters, is ultrasonically treated 5min；
S6：36mg natrium nitrosum is dissolved in 20ml deionized waters, the anhydrous to ammonia of 92mg is added under conditions of ice-water bath
The HCl of base benzene sulfonic acid and 1g1mol/L, after there is the acinous white precipitate of Diazosalt of sulfanilic acid, it is anti-to continue stirring
15 min are answered, Diazosalt of sulfanilic acid is made；
S7：Diazosalt of sulfanilic acid obtained by S6 steps is added in the graphene oxide suspension of partial reduction,
Continue stirring reaction 2h under the conditions of ice-water bath；The graphene oxide solution that subsequent p-sulfonic acid base is modified is centrifuged, and is made
Sulfonic group modified graphene oxide；
S8：Take sulfonic group modified graphene oxide made from S7 steps to be dissolved in 150mL deionized waters, be ultrasonically treated 5min；With
0.1g hydrazine hydrates are added afterwards, the stirring reaction 24h under the conditions of 100 DEG C, then add 5wt% aqueous sodium carbonates, separate out sulfonation stone
Black alkene；
S9：The sulfonated graphene that S9 steps obtain is cleaned multiple times with deionized water, it is standby after 60 DEG C of vacuum drying.
Embodiment 1：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare POM composite fillers：By 60 parts by weight POM（Polyformaldehyde）, 20 parts by weight crystal whisker of hexa potassium titanate（PTW）、20
Parts by weight PTFE（Polytetrafluoroethylene (PTFE)）After kollag drying, 0.3 parts by weight antioxidant B225 and the second of 0.1 parts by weight three are added
Alcohol ammonium, is mixed in high speed mixer, is dried after extruding pelletization at a temperature of 160 DEG C~190 DEG C stand-by.
It is 60% by porosity, aperture 2mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 6 minutes in the 3wt% NaOH aqueous solution successively, are washed 6 minutes in 3wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 1wt% KH550 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 100mg/L, temperature is 40 DEG C are made, the foamed aluminium hair after above-mentioned steps are handled
Base connects 20V DC power cathodes, and graphite electrode connects the DC power anode, heavy using electricity in sulfonated graphene-aqueous dispersions
Product method deposited graphite alkene transition zone on foamed aluminium hole surface, regulates and controls graphene by control electric current (voltage) and time
Transition region thickness, sedimentation time 5min, 2~3cm of two-stage spacing；By the bubble after the processing of deposited sulfonated graphene after the completion of deposition
Foam aluminium blank makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained POM composites filler is subjected to high-temperature injection shaping under 170~200 DEG C, 70MPa afterwards；Injection molding
Other techniques：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time,
30 seconds dwell times；Plastic is taken out after cooling, obtains sliding bearing blank；Sliding bearing blank obtains institute after being machined
The sliding bearing product needed.
Embodiment 2：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare POM composite fillers：By 70 parts by weight POM, 10 parts by weight crystal whisker of hexa potassium titanate (PTW), 10 parts by weight
After the drying of PTFE kollags, 0.1 parts by weight antioxidant B225 and 0.3 parts by weight triethanol ammonium are added, in high speed mixer
In mixed, dried after extruding pelletization at a temperature of 160 DEG C~190 DEG C stand-by.
It is 80% by porosity, aperture 4mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 4 minutes in the 8wt% NaOH aqueous solution successively, are washed 4 minutes in 8wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 3wt% KH570 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 300mg/L, temperature is 20 DEG C are made, the foamed aluminium hair after above-mentioned steps are handled
Base connects 110V DC power cathodes, and graphite electrode connects the DC power anode, heavy using electricity in sulfonated graphene-aqueous dispersions
Product method deposited graphite alkene transition zone on foamed aluminium hole surface, regulates and controls graphene by control electric current (voltage) and time
Transition region thickness, sedimentation time 2min, 2~3cm of two-stage spacing；By the bubble after the processing of deposited sulfonated graphene after the completion of deposition
Foam aluminium blank makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained POM composites filler is subjected to high-temperature injection shaping under 170~200 DEG C, 100MPa afterwards；Injection molding
Other techniques：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time,
30 seconds dwell times；Plastic is taken out after cooling, obtains sliding bearing blank；Sliding bearing blank obtains institute after being machined
The sliding bearing product needed.
Embodiment 3：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare POM composite fillers：By 65 parts by weight POM, 15 parts by weight crystal whisker of hexa potassium titanate（PTW）, 15 parts by weight
After the drying of PTFE kollags, 0.2 parts by weight antioxidant B225 and 0.2 parts by weight triethanol ammonium are added, in high speed mixer
In mixed, dried after extruding pelletization at a temperature of 160 DEG C~190 DEG C stand-by.
It is 70% by porosity, aperture 4mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 5 minutes in the 5wt% NaOH aqueous solution successively, are washed 5 minutes in 5wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 2wt% KH560 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 200mg/L, temperature is 30 DEG C are made, the foamed aluminium hair after above-mentioned steps are handled
Base connects 70V DC power cathodes, and graphite electrode connects the DC power anode, heavy using electricity in sulfonated graphene-aqueous dispersions
Product method deposited graphite alkene transition zone on foamed aluminium hole surface, regulates and controls graphene by control electric current (voltage) and time
Transition region thickness, sedimentation time 4min, 2~3cm of two-stage spacing；By the bubble after the processing of deposited sulfonated graphene after the completion of deposition
Foam aluminium blank makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained POM composites filler is subjected to high-temperature injection shaping under 170~200 DEG C, 85MPa afterwards；Injection molding
Other techniques：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time,
30 seconds dwell times；Plastic is taken out after cooling, obtains sliding bearing blank；Sliding bearing blank obtains institute after being machined
The sliding bearing product needed.
Embodiment 4：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare PE（Polyethylene）Composite filler：By 60 parts by weight PE, 20 parts by weight crystal whisker of hexa potassium titanate（PTW）, 20 weights
After measuring the drying of part PTFE kollags, 0.3 parts by weight antioxidant 1010 is added, is mixed in high speed mixer, 180
DEG C~220 DEG C at a temperature of dry after extruding pelletization it is stand-by.
It is 65% by porosity, aperture 2mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 6 minutes in the 3wt% NaOH aqueous solution successively, are washed 6 minutes in 3wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 1wt% KH550 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 100mg~300mg/L, temperature is 20~40 DEG C are made, after above-mentioned steps are handled
Foamed aluminium blank connect 20V DC power cathodes, graphite electrode connects the DC power anode, in sulfonated graphene-aqueous dispersions
It is middle use electro-deposition method deposited graphite alkene transition zone on foamed aluminium hole surface, by control electric current (voltage) and time come
Regulate and control graphene transition region thickness, sedimentation time 5min, 2~3cm of two-stage spacing；By deposited sulfonated graphene after the completion of deposition
Foamed aluminium blank after processing makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained PE composites filler is subjected to high-temperature injection shaping under 180~220 DEG C, 70MPa afterwards；Injection molding its
Its technique：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time, protect
Press 30 seconds time；Plastic is taken out after cooling, obtains sliding bearing blank；Needed for sliding bearing blank obtains after being machined
The sliding bearing product wanted.
Embodiment 5：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare PS（Polystyrene）Composite filler：By 70 parts by weight PS, 10 parts by weight crystal whisker of hexa potassium titanate (PTW), 10
After the drying of parts by weight PTFE kollags, 0.1 parts by weight antioxidant 1010 is added, is mixed in high speed mixer,
Dried at a temperature of 250 DEG C~270 DEG C after extruding pelletization stand-by.
It is 80% by porosity, aperture 4mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 4 minutes in the 8wt% NaOH aqueous solution successively, are washed 4 minutes in 8wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 3wt% KH570 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 300mg/L, temperature is 20 DEG C are made, the foamed aluminium hair after above-mentioned steps are handled
Base connects 110V DC power cathodes, and graphite electrode connects the DC power anode, heavy using electricity in sulfonated graphene-aqueous dispersions
Product method deposited graphite alkene transition zone on foamed aluminium hole surface, regulates and controls graphene by control electric current (voltage) and time
Transition region thickness, sedimentation time 2min, 2~3cm of two-stage spacing；By the bubble after the processing of deposited sulfonated graphene after the completion of deposition
Foam aluminium blank makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained PS composites filler is subjected to high-temperature injection shaping under 250~270 DEG C, 100MPa afterwards；Injection molding
Other techniques：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time,
30 seconds dwell times；Plastic is taken out after cooling, obtains sliding bearing blank；Sliding bearing blank obtains institute after being machined
The sliding bearing product needed.
Embodiment 6：
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing is produced according to the following steps：
Prepare PEEK (polyether-ether-ketone) composite filler：By 65 parts by weight PEEK, 15 parts by weight crystal whisker of hexa potassium titanate
(PTW), after the drying of 15 parts by weight PTFE kollags, 0.2 parts by weight antioxidant 1010 is added, is carried out in high speed mixer
Mixing, is dried stand-by after extruding pelletization at a temperature of 340 DEG C~380 DEG C.
It is 70% by porosity, aperture 4mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 5 minutes in the 5wt% NaOH aqueous solution successively, are washed 5 minutes in 5wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 2wt% KH550 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By the sonicated 30min of the sulfonated graphene of foregoing preparation, overweight processing 1h, in the case of rotating speed 2000rpm
Sulfonated graphene-aqueous dispersions that concentration is 200mg/L, temperature is 20~40 DEG C, the foam after above-mentioned steps are handled is made
Aluminium blank connects 80V DC power cathodes, and graphite electrode connects the DC power anode, is used in sulfonated graphene-aqueous dispersions
Electro-deposition method deposited graphite alkene transition zone on foamed aluminium hole surface, stone is regulated and controled by control electric current (voltage) and time
Black alkene transition region thickness, sedimentation time 3min, 2~3cm of two-stage spacing；By after the processing of deposited sulfonated graphene after the completion of deposition
Foamed aluminium blank 3 ~ 5h is made annealing treatment at a temperature of vacuum, 300~400 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained PEEK composites filler is subjected to high-temperature injection shaping under 350~390 DEG C, 90MPa afterwards；Injection molding
Other techniques：190 DEG C of barrel temperature, 100 DEG C of mold temperature, injection rate 90%, 30 seconds, dwell pressure 90MPa injection time,
30 seconds dwell times；Plastic is taken out after cooling, obtains sliding bearing blank；Sliding bearing blank obtains institute after being machined
The sliding bearing product needed.
Comparative example 1
Prepare POM composite fillers：By 60 parts by weight POM, 20 parts by weight crystal whisker of hexa potassium titanate (PTW), 20 parts by weight
After the drying of PTFE kollags, 0.3 parts by weight antioxidant B225 and 0.1 parts by weight triethanol ammonium are added, in high speed mixer
In mixed, dried after extruding pelletization at a temperature of 160 DEG C~190 DEG C stand-by.
It is 60% by porosity, aperture 2mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 6 minutes in the 3wt% NaOH aqueous solution successively, are washed 6 minutes in 3wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 1wt% KH550 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained POM composites filler is subjected to high-temperature injection shaping under 170~200 DEG C, 70MPa afterwards, taken after cooling
Go out plastic, obtain sliding bearing blank；Sliding bearing blank obtains required sliding bearing product after being machined.
Comparative example 2
Prepare PEEK (polyether-ether-ketone) composite filler：By 60 parts by weight PEEK, 20 parts by weight crystal whisker of hexa potassium titanate
(PTW), after the drying of 20 parts by weight PTFE kollags, 0.3 parts by weight antioxidant 1010 is added, is carried out in high speed mixer
Mixing, is dried stand-by after extruding pelletization at a temperature of 340 DEG C~380 DEG C.
It is 65% by porosity, aperture 2mm, the foam that size is internal diameter Φ 45mm, external diameter Φ 62mm, length are 62mm
Aluminium blank alkali cleaning 6 minutes in the 3wt% NaOH aqueous solution successively, are washed 6 minutes in 3wt% HCI aqueous acid mediums；Rinsed with water
Make the flushing liquor of foamed aluminium in neutrality；Dried at a temperature of being placed in 80~100 DEG C；Foamed aluminium 1wt% KH550 coupling agents are used again
Hydrolyzate is surface-treated；Dried at a temperature of 80~100 DEG C.
By mould installion on injection machine, the foamed aluminium blank after above-mentioned steps are handled is put into mould, matched moulds；So
Foregoing obtained PEEK composites filler is subjected to high-temperature injection shaping under 350~390 DEG C, 70MPa afterwards, taken after cooling
Go out plastic, obtain sliding bearing blank；Sliding bearing blank obtains required sliding bearing product after being machined.
Test situation and result such as following table:
Foamed aluminium/polymer three-dimensional IPN composite property index
Composite sliding bearing provided by the present invention has excellent performance, and compared with high polymer material guide bearing, it has height
Intensity, high rigidity and high heat conduction and thermal diffusivity, large carrying capacity；Compared with metal material guide bearing, it has excellent wear-resisting
Self-lubricating property, without oily, small, bite-resistant is worn to counterpart, noise is small during motion.In foamed aluminium and polymer two
Between boundary, sulfonated graphene transition zone is introduced by electrodeposition process, efficiently solve foamed aluminium and polymeric material because
Interface degumming caused by thermal coefficient of expansion difference, the technical problems such as interface resistance is big, so as to obtain structural integrity, function admirable
Foamed aluminium/polymer three-dimensional IPN composite sliding bearing.Foamed aluminium/polymer three-dimensional IPN prepared by relatively existing method
Sulfonated graphene transition zone is contained in composite, product prepared by this method, its inside, and plastic-aluminum interface cohesion is good, no structure
Defect, therefore its thermal conductivity factor is up to 2.1~2.4W/ (mK)-1, and possess the premium properties such as wear-resisting, self-lubricating, intensity height.
It is clear that the invention is not restricted to above preferred embodiment, can also be limited in the claims in the present invention and specification
In spirit, the conversion and improvement of diversified forms are carried out, can solve same technical problem, and technique effect expected from acquirement, therefore
Do not repeat.One of ordinary skill in the art can from present disclosure directly or all schemes for associating, if
Within the spirit that claim limits, protection scope of the present invention is fallen within.
Claims (10)
1. a kind of composite sliding bearing, it is characterised in that be made through following methods：Foamed aluminium passes sequentially through degreasing, alkali cleaning and acid
After washing, it is surface-treated using silane coupler；Foamed aluminium after upper step process is by electro-deposition method in foamed aluminium
Hole surface deposit one layer of sulfonated graphene；Foamed aluminium after above-mentioned steps are handled is fitted into injection mold, by wear-resistant plastic
It is molded, is cooled and shaped using Shooting Technique；Foamed aluminium before degreasing is that porosity is 60% with full communicating hole system~
80%, aperture is 2~4mm foamed aluminium.
2. composite sliding bearing according to claim 1, it is characterised in that the sulfonated graphene is using Hummers
Method, the graphene as made from graphite oxidized stripping reduction, the obtained sulfonated graphite after graphenic surface modifies sulfonic group
Alkene.
3. composite sliding bearing according to claim 1, it is characterised in that the sulfonated graphene is using Hummers
Method, the graphene as made from graphite oxidized stripping reduction, graphene are carried out sulfonated after sodium borohydride carries out prereduction
Processing, then using obtained sulfonated graphene after hydrazine progress secondary reduction.
4. a kind of composite sliding bearing preparation method, it is characterised in that comprise the following steps：Foamed aluminium passes sequentially through degreasing, alkali
Wash with after pickling, be surface-treated using silane coupler；Foamed aluminium after upper step process is existed by electro-deposition method
The hole surface of foamed aluminium deposits one layer of sulfonated graphene；Foamed aluminium after one layer of sulfonated graphene of deposition is fitted into injection mold,
Wear-resistant plastic is molded using Shooting Technique, is cooled and shaped；The wear-resistant plastic include polyformaldehyde, polyether-ether-ketone, polyphenylene sulfide,
At least one of polytetrafluoroethylene (PTFE), ultra-high molecular weight polyethylene；Foamed aluminium before degreasing is passed through by fine aluminium and/or alusil alloy
It is made after foaming, it has full communicating hole system, and porosity is 60%~80%, and aperture is 2~4mm.
5. composite sliding bearing preparation method according to claim 4, it is characterised in that the hole surface in foamed aluminium
One layer of sulfonated graphene preparation process of deposition includes using dc source, and graphite electrode connects positive pole, and workpiece connects negative pole, is in concentration
2~5min is deposited in 100mg~300mg/L, graphene sulfonated graphene-aqueous dispersions that temperature is 20~40 DEG C.
6. composite sliding bearing preparation method according to claim 4, it is characterised in that the sulfonated graphene is use
Hummers methods, the graphene as made from graphite oxidized stripping reduction are obtained after graphenic surface modifies sulfonic group
Sulfonated graphene.
7. composite sliding bearing preparation method according to claim 4, it is characterised in that the sulfonated graphene is use
Hummers methods, the graphene as made from graphite oxidized stripping reduction, graphene enter after sodium borohydride carries out prereduction
The sulfonated processing of row, then using obtained sulfonated graphene after hydrazine progress secondary reduction.
8. composite sliding bearing preparation method according to claim 4, it is characterised in that also include deposited sulfonation stone
Foamed aluminium after black alkene processing makes annealing treatment 3 ~ 5h at a temperature of vacuum, 300~400 DEG C.
9. composite sliding bearing preparation method according to claim 4, it is characterised in that the Shooting Technique condition is：
190 DEG C of barrel temperature, 100 DEG C, 70~110MPa of injection pressure of mold temperature, injection rate 90%, 30 seconds injection time, pressurize
Pressure 90MPa, 30 seconds dwell times.
10. composite sliding bearing preparation method according to claim 4, it is characterised in that the cooling and shaping process bag
Include at a temperature of 50~80 DEG C, be incubated 2~3h, then naturally cool to room temperature.
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| CN114434100A (en) * | 2022-01-18 | 2022-05-06 | 深圳市栢迪科技有限公司 | Treatment method of aluminum alloy blank, aluminum alloy blank and application |
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