CN109139755A - A kind of preparation method of the copper-based composite friction material of iron - Google Patents
A kind of preparation method of the copper-based composite friction material of iron Download PDFInfo
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- CN109139755A CN109139755A CN201810791250.XA CN201810791250A CN109139755A CN 109139755 A CN109139755 A CN 109139755A CN 201810791250 A CN201810791250 A CN 201810791250A CN 109139755 A CN109139755 A CN 109139755A
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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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- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0008—Ferro
-
- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0034—Materials; Production methods therefor non-metallic
- F16D2200/0052—Carbon
-
- 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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/006—Materials; Production methods therefor containing fibres or particles
- F16D2200/0065—Inorganic, e.g. non-asbestos mineral fibres
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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
- F16D2200/00—Materials; Production methods therefor
- F16D2200/0082—Production methods therefor
- F16D2200/0086—Moulding materials together by application of heat and pressure
Abstract
A kind of preparation method of the copper-based composite friction material of iron, raw material is after ingredient mixes, and high temperature hot pressing sintering obtains again after being cold-pressed, and is pressed and molded using the pressure of 450~550MPa；Green compact is placed in heating furnace and carries out pressure sintering, sintering process in nitrogen protection atmosphere are as follows: 1000 DEG C, keep the temperature 2~3h, furnace cooling under 2.5~2.8MPa pressure；High temperature hot pressing sintering obtains friction material of the invention again after being cold-pressed, play the respective advantage of both iron copper, simultaneously, it is applied to specific modulus, specific strength high carbon fiber in Fe Cu based frictional materals, enhances matrix strength, improve impact flexibility, reduce brake noise, coefficient of friction is suitable, and high temperature abrasion resistance is excellent.
Description
Technical field
The present invention relates to a kind of preparation methods of composite friction material, and in particular to all kinds of engineering machinery brakings and transmission
A kind of preparation method of the copper-based composite friction material of iron.
Background technique
Friction material is the material that power is transmitted or absorbed using rubbing action, mainly includes brake facing and clutch
Piece is widely used on all kinds of engineering mechanical devices such as automobile, train, aircraft, oil-well rig.Common friction material has NAO
Type, semipermanent mold, metal mold friction material.Wherein NAO type friction material mainly uses glass fibre, the cruel fiber of fragrant adoption cruel
Or other fibers (carbon, ceramics etc.) be used as reinforcement material, performance depend primarily on fiber type and other addition mixtures.
Wear resistence and in terms of there is good characteristic, but it is temperature sensitive, after braking repeatedly, be easy to cause organic matter point
Solution, is remarkably decreased so as to cause braking ability.30%~50% or so is usually contained in its composition of semipermanent mold friction material
Ferrous metal object (such as steel fibre, reduced iron powder, foam ferrous powder) is led although absorption per unit area power is high there are heat-resist
The advantages that hot coefficient is big, but its brake noise is big, the easy embrittlement in corner.Metal mold friction material generallys use powder metallurgy legal system
Comprising iron-based and copper-based two major classes, long service life, braking and transmission conditions suitable for higher temperature.Iron-based friction
It is big and cheap to bear larger load, mechanical strength for material high temperature resistant；Although however iron-based friction material coefficient of friction
Greatly, intensity is high, but is easy to mating plate surface and adheres, and stable friction factor is poor, and wearability is not so good as copper base friction material.Copper
Base frication material processing performance is good, stable friction factor, and anti stick, anti-clamping stagnation performance is good, thermal conductivity is good, but coefficient of friction is small,
And economic cost is higher, and after discarded, due to storing up for a long time, heavy metal Cu element can occur to activate on a large scale, migrate, right
Surrounding enviroment generate heavy metal pollution and harm.
Fe Cu based frictional materals are with copper powder and iron powder for main constituent element, and quality accounts for powder metallurgy friction material total weight
50 or more percent, institutional framework, bearing capacity and nature determine the mechanical performance and heat resistance of material, matrix
Must have it is enough carrying, capacity of heat transmission protection materials be not destroyed with it is thermally influenced.It, can in order to enhance the intensity of matrix
To add the metallic elements such as titanium, nickel, molybdenum in the base, this is because the metals such as titanium, nickel, molybdenum are added in matrix, group can be refined
It knits, and causes distortion of lattice, so that matrix strength, hardness increase.Common friction component has TiC, SiC, TiN and high-melting-point
Metal (Ni, Fe, Mo) powder, metal oxide (Al2O3、SiO2、Fe2O3) and mullite, boride etc., effect be for
The coefficient of friction for improving material increases resistance to sliding, and usually used friction component is to be added to material in combination
In, it is more preferable than adding individual friction component comprehensive performance.Friction component material requested requires fusing point and heat of dissociation high, from room temperature
Without polymorphic transformation in the range of to sintering temperature or use temperature；It is not chemically reacted with other components or sintering atmosphere；Tool
There are sufficiently high intensity and hardness, guarantee survivable in friction process, but intensity and hardness again cannot be too high, otherwise can
Excessive wear antithesis matrix alloy；The wettability of matrix constituent element will be got well.In friction material, lubricant component appropriate is added
The greasy property of friction material can be improved, to reduce wear rate of the material in braking process.Generally with graphite, curing
Based on molybdenum, lead etc., the solid lubricants such as molybdenum sulfide, copper sulfide, barium sulphide or boron nitride are also selected sometimes.Lead, the tin of low melting point
Deng at high temperature can local melting, frictional heat can be absorbed and form thin film on rubbing surface, prevent bonding, occlusion and wipe
Wound.
With the fast development of people's living standard increasingly improved with urbanization, the various vehicles emerge one after another, machine
Device power, load and speed further increase, and also have to safety and environmental protection, comfort while people's trip facilitates higher
Requirement.Advantage iron-based and copper-based in metal mold friction material is integrated into Fe Cu based frictional materals obtained and has both iron-based rub
Wipe material high temperature resistant, the advantages of the big advantage of matrix strength, while also having copper-based heating conduction good, stable friction factor,
The dosage for reducing copper, reduces costs, and reduces environmental pollution, but Fe Cu based frictional materals brake noise is larger, and brittleness is big.Such as
It is a weight for improving Fe Cu based frictional materals performance that, which improves the impact flexibility of Fe Cu based frictional materals and reduces vibration noise,
Want direction.Such as that specific modulus, specific strength is high carbon fiber, is applied in Fe Cu based frictional materals, matrix strength can be enhanced, mention
High impact-resistant toughness reduces brake noise, since carbon fiber has self-lubricating property, can effectively reduce antithesis abrasion, have
Good, corrosion-resistant, the anti-friction performance of anti-fatigue performance is good, while having suitable coefficient of friction, the good characteristics such as high temperature resistant property.
Summary of the invention
In order to overcome the defects of the prior art described above, it solves existing single iron-based friction material surface easily to adhere, friction system
Number stability is poor, and wearability is inadequate, and single copper base friction material coefficient of friction is small, and economic cost is higher, the pollution of heavy metal Cu
The problems such as, the object of the present invention is to provide a kind of preparation methods of the copper-based composite friction material of iron, and it is respective to play both iron copper
Advantage, meanwhile, the high carbon fiber of specific modulus, specific strength is applied in Fe Cu based frictional materals, matrix strength is enhanced, improves punching
Toughness is hit, reduces brake noise, coefficient of friction is suitable, and high temperature abrasion resistance is excellent.
In order to achieve the above object, the technical solution of the present invention is as follows:
A kind of preparation method of the copper-based composite friction material of iron, comprising the following steps:
Step 1, ingredient, following percentages are mass percent
By 40~60 microns of dendroid electrolytic copper powder 30~40%, 40~60 microns of partial size of spherical or subsphaeroidal atomization
Iron powder 25~35%, iron powder and copper powder total amount are no more than 72%, 40~60 microns of titanium valve, nickel powder and molybdenum powder each 2~3%, titanium
Flaky graphite powder 8~10% of the sum of powder, nickel powder and molybdenum powder three control at 6~9%, 60~80 microns, diameter 5~7 are micro-
The nearly spherical molybdenum disulfide 2~4% of 2~4%, 60~80 microns of the chopped carbon fiber that 1~3 millimeter of meter Chang Du, graphite powder, carbon fiber
Dimension, the sum of molybdenum sulfide three are no more than 15%, then plus 70~100 microns of kaolin, feldspar powder and mullite each 2~3%, with
And 1~2% 70~100 microns of vermiculite power mixes；And theoretical density is calculated according to formula 1, unit: ρ gram per centimeter3；
Formula 1 is as follows, and the symbol in formula before percentage sign indicates that the title of each component, summation are 100%
Step 2, mixing
It is fitted into after the raw material of step 1 is proportionally weighed up in " Y " font batch mixer, adds according to 10~15 milliliters/kilogram
Solubilizer 120# gasoline, then mixing 2~3 hours under 30~50 revs/min of speed；Then the material that will be mixed, then add
The glycerin solution for adding the mass concentration 80% of 5~10 milliliters/kilogram is stirred evenly with hand rubbing, crosses the sieve of 30~40 mesh
Granulation, dries in the shade stop 2~4 hours at room temperature；
Step 3, it forms
V centimetres of its volume is calculated according to the drawing of friction block first3, then calculated using formula 2 and mixed needed for green compact
M grams of weight for closing powder；The powder of these weight is weighed in the balance again in the type chamber that former in steel pressing mold and bottom punch are constituted
(design and process in advance according to drawing), finally puts upper punch, and the pressure for applying 600~700MPa on a hydraulic press carries out
Cold moudling:
2 M=95% ρ V (gram) of formula
Step 4, boat is filled
The green compact of step 3 forming are mounted in boat, the graphite stamping of same sectional dimension, entire graphite boat is placed above
Up and down using 5~10 millimeters of heat-resisting steel sheet and plate as pallet；
Step 5, it is sintered
The boat that step 4 installs successively is stacked in heating furnace cavity from bottom to top, covers bell, connects pressurization dress
It sets, is passed through protective atmosphere nitrogen and carries out pressure sintering；Heating rate is controlled at 200~250 DEG C/h, is heated to 950~1000
DEG C heat preservation 2~3 hours, while applying the pressure of 1.0~2.5MPa, then furnace cooling, etc. temperature drop to 300 DEG C or less and beat
Blow-on lid closes protective atmosphere；Friction block is taken out from graphite boat after stopping 2 hours；
Step 6, sandblasting
The burned friction block of step 5 is utilized into the pollution on solid sandblasting removal surface；Sand grains used be diameter about 0.5~
The white corundum sand of 1mm, with the surface 1~3 minute of the speed high speed impact friction block of 5~8 meter per seconds.
High temperature hot pressing sintering obtains friction material of the invention again after being cold-pressed, the beneficial effect is that:
1, the formula composition of present invention adjustment Fe Cu based frictional materals, adds the metallic elements such as titanium, nickel, molybdenum in the base,
Because the metals such as titanium, nickel, molybdenum are added in matrix, can be with thinning microstructure, and cause distortion of lattice, so that matrix strength, hardness increase
Add.Lubricant component or graphite by anti-friction composition and MoS2 are made of many layers or piece, and each layer itself is very strong, but between each layer
Combination it is very weak, cause the anti-pressure ability of these materials very strong, anti-shear ability is weak, therefore additional amount has a suitable range.
2, prepared Fe Cu based frictional materals, coefficient of friction is moderate, stablizes, and wearability is good, pollution-free, process flow letter
List, at low cost, no brake noise, heat fading are small.
Detailed description of the invention
Fig. 1 is three high graphite boat structural schematic diagrams.
Fig. 2 is the micro-organization chart of friction material, and Fig. 2A is micrograph under low power；Fig. 2 B is micrograph under high power.
Fig. 3 is the noise comparison diagram of conventional friction block Yu friction block of the present invention.
Specific embodiment
The present invention is described in detail with reference to the accompanying drawings and detailed description.
Embodiment one
About 25 millimeters of diameter are prepared, high 10 millimeters of cylindrical friction block, comprising the following steps:
Step 1, ingredient.By 40 microns of dendroid electrolytic copper powder 30%, 40 microns of partial size of spherical or subsphaeroidal atomization
Iron powder 35%, 40 microns of titanium valve, nickel powder and molybdenum powder each 3% and 60 microns of flaky graphite powder 9%, 5 micrometer length of diameter
1 millimeter of 4%, 60 micron of chopped carbon fiber of nearly spherical molybdenum disulfide 2%, then plus 70 microns of kaolin, feldspar powder and not
Carry out 70 microns of the vermiculite power mixing of stone each 3% and 2%.And calculating theoretical density ρ according to formula 1 is 4.88 grams/li
Rice3。
Step 2, mixing.Be fitted into after the raw material of step 1 is proportionally weighed up in " Y " font batch mixer, according to 10 milliliters/
Kilogram addition 120# industrial naptha, then mixing 2 hours under 30 revs/min of speed；Then the material that will be mixed, addition 5
The glycerin solution of milliliter/kilogram mass concentration 80% is stirred evenly with hand rubbing, crosses the sieve granulation of 30 mesh, at room temperature
It dries in the shade and (stops 2 hours).
Step 3, it forms.Calculating its volume V according to the drawing of friction block first is 4.9 centimetres3, then utilize formula 2
The weight M for calculating mixed powder needed for green compact is 22.7 grams；The powder for weighing these weight in the balance again is negative in steel pressing mold
It (designs and processes in advance according to drawing) in the type chamber that mould and bottom punch are constituted, finally put upper punch, apply on a hydraulic press
The pressure (i.e. 30 tons of pressure) of 600MPa is added to carry out cold moudling.
Step 4, boat is filled.The green compact of step 3 forming are led three high graphite institutes mounted in high-strength, highly dense, high according to shown in Fig. 1
In the boat or mold of system (cavity dimension in graphite boat is identical as friction block), same sectional dimension is placed above (with green compact
Sectional dimension it is identical) graphite stamping, entire graphite boat up and down using 5 millimeters of heat-resisting steel sheet and plate as pallet.
Step 5, it is sintered.The boat that step 4 installs successively is stacked in heating furnace cavity from bottom to top, covers bell, even
Pressurizing device is connected, protective atmosphere nitrogen is passed through and carries out pressure sintering, heating rate is controlled at 200 DEG C/h, is heated to 950
DEG C heat preservation 3 hours, while applying the pressure of 1.0MPa, then furnace cooling, etc. temperature drop to 300 DEG C or less opening bells, pass
Close protective atmosphere；Friction block is taken out from graphite boat after stopping 2 hours.
Step 6, sandblasting.The burned friction block of step 5 is utilized into the pollution on solid sandblasting removal surface；Sand grains used is straight
The white corundum sand of diameter about 0.5mm, with the surface 1 minute of the speed high speed impact friction block of 5 meter per seconds.
The microscopic structure of the copper-based composite friction material of the made iron of the present embodiment is as shown in Figure 2.Fe Cu based frictional materals it is close
Degree is 4.5~5.1g/cm3；Average hardness is HV200~HV227.Coefficient of friction 0.40~0.45.Noise is compared such as Fig. 3 institute
Show, Fig. 3 A is the biggish conventional friction material of wave amplitude ratio, and what Fig. 3 B was substantially not visible wave amplitude is the made friction material of the present invention
Material.
Embodiment two
Preparation is 40 millimeters long, 20 millimeters wide, high 10 millimeters of cuboid friction block, comprising the following steps:
Step 1, ingredient.By 60 microns of dendroid electrolytic copper powder 40%, 60 microns of partial size of spherical or subsphaeroidal atomization
Iron powder 30%, it is 60 microns of titanium valve, nickel powder and molybdenum powder each 2.5% and 80 microns of flaky graphite powder 8%, 7 microns of diameter long
3 millimeters of 3%, 80 micron of chopped carbon fiber of nearly spherical molybdenum disulfide 4% of degree, then plus 100 microns of kaolin, feldspar powder
Vermiculite power with 100 microns of mullite each 2% and 1.5% mixes.And theoretical density ρ is calculated according to formula 1 and is
5.31 gram per centimeter3。
Step 2, mixing.Be fitted into after the raw material of step 1 is proportionally weighed up in " Y " font batch mixer, according to 12 milliliters/
Kilogram addition 120# industrial naptha, then mixing 3 hours under 50 revs/min of speed；Then the material that will be mixed, addition 10
The glycerin solution of milliliter/kilogram mass concentration 80% is stirred evenly with hand rubbing, crosses the sieve granulation of 40 mesh, at room temperature
It dries in the shade and (stops 4 hours).
Step 3, it forms.Calculating its volume V according to the drawing of friction block first is 8 centimetres3, then counted using formula 2
The weight M of mixed powder needed for calculating green compact is 40.4 grams；The powder of these weight is weighed in the balance again mounted in former in steel pressing mold
It (designs and processes in advance according to drawing) in the type chamber constituted with bottom punch, finally put upper punch, apply on a hydraulic press
The pressure (i.e. 56 tons of pressure) of 700MPa carries out cold moudling.
Step 4, boat is filled.The green compact of step 3 forming are led three high graphite institutes mounted in high-strength, highly dense, high according to shown in Fig. 1
In the boat or mold of system (cavity dimension in graphite boat is identical as friction block), same sectional dimension is placed above (with green compact
Sectional dimension it is identical) graphite stamping, entire graphite boat up and down using 7 millimeters of heat-resisting steel sheet and plate as pallet.
Step 5, it is sintered.The boat that step 4 installs successively is stacked in heating furnace cavity from bottom to top, covers bell, even
Pressurizing device is connected, protective atmosphere nitrogen is passed through and carries out pressure sintering；Heating rate is controlled at 250 DEG C/h, is heated to 1000
DEG C heat preservation 2 hours, while applying the pressure of 2.5MPa, then furnace cooling, etc. temperature drop to 300 DEG C or less opening bells, pass
Close protective atmosphere；Friction block is taken out from graphite boat after stopping 2 hours.
Step 6, sandblasting.By the burned friction block of step 5 using the pollution on solid sandblasting removal surface, sand grains used is straight
The white corundum sand of diameter about 1mm, with the surface 3 minutes of the speed high speed impact friction block of 8 meter per seconds.
The density of the copper-based composite friction material of the made iron of the present embodiment is 4.8~5.1g/cm3；Average hardness be HV200~
HV210.Coefficient of friction 0.40~0.42.Noise comparative experiments, is substantially not visible wave amplitude.
Embodiment three
Outer 80 millimeters of arc radius of preparation, 60 millimeters of interior arc radius, 80 degree of central angle, 10 millimeters of thickness of fan-shaped friction block,
The following steps are included:
Step 1, ingredient.By 50 microns of dendroid electrolytic copper powder 37%, 50 microns of partial size of spherical or subsphaeroidal atomization
Iron powder 33%, 50 microns of titanium valve, nickel powder and molybdenum powder each 2% and 70 microns of flaky graphite powder 10%, 6 microns of diameter, length
3 millimeters of chopped carbon fiber 2% of degree, 70 microns of nearly spherical molybdenum disulfide 2.7%, then plus 80 microns of kaolin, feldspar powder
Vermiculite power with 80 microns of mullite each 2.7% and 1.2% mixes, and calculates theoretical density ρ according to formula 1 and be
5.05 gram per centimeter3。
Step 2, mixing.Be fitted into after the raw material of step 1 is proportionally weighed up in " Y " font batch mixer, according to 15 milliliters/
Kilogram addition 120# industrial naptha, then mixing 2.5 hours under 40 revs/min of speed；Then the material that will be mixed, addition
The glycerin solution of 8 milliliter/kilogram mass concentrations 80% is stirred evenly with hand rubbing, crosses the sieve granulation of 30 mesh, at room temperature
It dries in the shade and (stops 3 hours).
Step 3, it forms.Calculating its volume V according to the drawing of friction block first is 19.5 centimetres3, then utilize formula 2
The weight M for calculating mixed powder needed for green compact is 93.6 grams.The powder for weighing these weight in the balance again is negative in steel pressing mold
It (designs and processes in advance according to drawing) in the type chamber that mould and bottom punch are constituted, finally put upper punch, apply on a hydraulic press
The pressure (i.e. 130 tons of pressure) of 650MPa is added to carry out cold moudling.
Step 4, boat is filled.The green compact of step 3 forming are led three high graphite institutes mounted in high-strength, highly dense, high according to shown in Fig. 1
In the boat or mold of system (cavity dimension in graphite boat is identical as friction block), same sectional dimension is placed above (with green compact
Sectional dimension it is identical) graphite stamping, entire graphite boat up and down using 10 millimeters of heat-resisting steel sheet and plate as pallet.
Step 5, it is sintered.The boat that step 4 installs successively is stacked in heating furnace cavity from bottom to top, covers bell, even
Pressurizing device is connected, protective atmosphere nitrogen is passed through and (is conducive to react to form nitride with addition group rod iron, titanium, improve resistance to
Mill property) carry out pressure sintering；Heating rate is controlled at 220 DEG C/h, is heated to 970 DEG C and is kept the temperature 2.5 hours, applies simultaneously
The pressure of 2.0MPa, then furnace cooling, etc. temperature drop to 300 DEG C or less opening bells, close protective atmosphere.It stops 2 hours
Friction block is taken out from graphite boat afterwards.
Step 6, sandblasting.By the burned friction block of step 5 using the pollution on solid sandblasting removal surface, sand grains used is straight
The white corundum sand of diameter about 0.8mm, with the surface 2 minutes of the speed high speed impact friction block of 7 meter per seconds.
The density of the copper-based composite friction material of the made iron of the present embodiment is 4.8~5.1g/cm3；Average hardness be HV210~
HV220.Coefficient of friction 0.42~0.45.Noise comparative experiments, is substantially not visible wave amplitude.
Claims (1)
1. a kind of preparation method of the copper-based composite friction material of iron, which comprises the following steps:
Step 1, ingredient, following percentages are mass percent
By 40~60 microns of dendroid electrolytic copper powder 30~40%, 40~60 microns of partial size of spherical or subsphaeroidal atomized iron powder
25~35%, iron powder and copper powder total amount are no more than 72%, 40~60 microns of titanium valve, nickel powder and molybdenum powder each 2~3%, titanium valve, nickel
Flaky graphite powder 8~10% of the sum of powder and molybdenum powder the three control at 6~9%, 60~80 microns, 5~7 micrometer length of diameter
1~3 millimeter of 2~4%, 60~80 microns of chopped carbon fiber of nearly spherical molybdenum disulfide 2~4%, graphite powder, carbon fiber, sulphur
Change the sum of molybdenum three and be no more than 15%, then plus 70~100 microns kaolin, feldspar powder and mullite each 2~3% and 1~
2% 70~100 microns of vermiculite power mixing；And theoretical density is calculated according to formula 1, unit: ρ gram per centimeter3；
Formula 1 is as follows, and the symbol in formula before percentage sign indicates that the title of each component, summation are 100%；
Step 2, mixing
It is fitted into " Y " font batch mixer, is added according to 10~15 milliliters/kilogram molten after the raw material of step 1 is proportionally weighed up
Agent 120# gasoline, then mixing 2~3 hours under 30~50 revs/min of speed；Then the material that will be mixed, then add 5~
The glycerin solution of the mass concentration 80% of 10 milliliters/kilogram is stirred evenly with hand rubbing, crosses the sieve granulation of 30~40 mesh,
It dries in the shade at room temperature stop 2~4 hours；
Step 3, it forms
V centimetres of its volume is calculated according to the drawing of friction block first3, then mixed powder needed for green compact is calculated using formula 2
M grams of weight；The powder of these weight is weighed in the balance again in the type chamber that former in steel pressing mold and bottom punch are constituted, is finally put
Upper upper punch, the pressure for applying 600~700MPa on a hydraulic press carry out cold moudling:
Formula 2M=95% ρ V (gram)
Step 4, boat is filled
The green compact of step 3 forming in boat, be placed above the graphite stamping of same sectional dimension, entire graphite boat it is upper
It is lower to use 5~10 millimeters of heat-resisting steel sheet and plate as pallet；
Step 5, it is sintered
The boat that step 4 installs successively is stacked in heating furnace cavity from bottom to top, bell is covered, connects pressurizing device, is led to
Enter protective atmosphere nitrogen and carries out pressure sintering；Heating rate is controlled at 200~250 DEG C/h, is heated to 950~1000 DEG C of guarantors
Temperature 2~3 hours, while apply 1.0~2.5MPa pressure, then furnace cooling, etc. temperature drop to 300 DEG C or less opening furnaces
Lid closes protective atmosphere；Friction block is taken out from graphite boat after stopping 2 hours；
Step 6, sandblasting
The burned friction block of step 5 is utilized into the pollution on solid sandblasting removal surface；Sand grains used is diameter about 0.5~1mm's
White corundum sand, with the surface 1~3 minute of the speed high speed impact friction block of 5~8 meter per seconds.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110056588A (en) * | 2019-03-27 | 2019-07-26 | 山东金麒麟股份有限公司 | A kind of friction material and powder metallurgy brake pad and the method for preparing friction block |
| CN110253016A (en) * | 2019-07-10 | 2019-09-20 | 北京瑞斯福高新科技股份有限公司 | A kind of passenger train powder metallurgy friction material and preparation method thereof |
| CN111390160A (en) * | 2020-04-30 | 2020-07-10 | 滁州欧瑞斯机车部件有限公司 | Preparation method of high-friction-coefficient brake material |
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| CN110056588A (en) * | 2019-03-27 | 2019-07-26 | 山东金麒麟股份有限公司 | A kind of friction material and powder metallurgy brake pad and the method for preparing friction block |
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| CN111571464A (en) * | 2020-05-26 | 2020-08-25 | 新乡市荣锋材料科技有限公司 | Matrix for high-speed grinding wheel, preparation method of matrix and superhard abrasive grinding wheel |
| CN111571464B (en) * | 2020-05-26 | 2021-09-24 | 新乡市荣锋材料科技有限公司 | Matrix for high-speed grinding wheel, preparation method of matrix and superhard abrasive grinding wheel |
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