CN111350781A - Copper-free friction lining and preparation method thereof - Google Patents
Copper-free friction lining and preparation method thereof Download PDFInfo
- Publication number
- CN111350781A CN111350781A CN202010375809.8A CN202010375809A CN111350781A CN 111350781 A CN111350781 A CN 111350781A CN 202010375809 A CN202010375809 A CN 202010375809A CN 111350781 A CN111350781 A CN 111350781A
- Authority
- CN
- China
- Prior art keywords
- parts
- temperature
- minutes
- friction lining
- copper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000000843 powder Substances 0.000 claims abstract description 46
- TZCXTZWJZNENPQ-UHFFFAOYSA-L barium sulfate Chemical compound [Ba+2].[O-]S([O-])(=O)=O TZCXTZWJZNENPQ-UHFFFAOYSA-L 0.000 claims abstract description 22
- 238000000034 method Methods 0.000 claims abstract description 20
- 229920001971 elastomer Polymers 0.000 claims abstract description 19
- 239000005060 rubber Substances 0.000 claims abstract description 19
- 229920006231 aramid fiber Polymers 0.000 claims abstract description 17
- 229920003043 Cellulose fiber Polymers 0.000 claims abstract description 15
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims abstract description 15
- 229910021383 artificial graphite Inorganic materials 0.000 claims abstract description 14
- 239000010445 mica Substances 0.000 claims abstract description 14
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 14
- 239000002557 mineral fiber Substances 0.000 claims abstract description 14
- 229940007424 antimony trisulfide Drugs 0.000 claims abstract description 13
- NVWBARWTDVQPJD-UHFFFAOYSA-N antimony(3+);trisulfide Chemical compound [S-2].[S-2].[S-2].[Sb+3].[Sb+3] NVWBARWTDVQPJD-UHFFFAOYSA-N 0.000 claims abstract description 13
- 229920005989 resin Polymers 0.000 claims abstract description 13
- 239000011347 resin Substances 0.000 claims abstract description 13
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000002994 raw material Substances 0.000 claims abstract description 10
- 239000003623 enhancer Substances 0.000 claims abstract description 8
- 239000012744 reinforcing agent Substances 0.000 claims abstract description 6
- 239000010433 feldspar Substances 0.000 claims abstract description 5
- 239000000314 lubricant Substances 0.000 claims abstract description 5
- 239000000853 adhesive Substances 0.000 claims abstract description 3
- 230000001070 adhesive effect Effects 0.000 claims abstract description 3
- 239000004760 aramid Substances 0.000 claims abstract description 3
- 239000000945 filler Substances 0.000 claims abstract description 3
- 238000010438 heat treatment Methods 0.000 claims description 56
- 239000000203 mixture Substances 0.000 claims description 56
- 238000011282 treatment Methods 0.000 claims description 22
- 238000007731 hot pressing Methods 0.000 claims description 18
- 238000002156 mixing Methods 0.000 claims description 18
- 238000005303 weighing Methods 0.000 claims description 15
- 229920000459 Nitrile rubber Polymers 0.000 claims description 13
- 238000000227 grinding Methods 0.000 claims description 9
- 238000005498 polishing Methods 0.000 claims description 8
- 238000005507 spraying Methods 0.000 claims description 8
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical class [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 5
- NTXGQCSETZTARF-UHFFFAOYSA-N buta-1,3-diene;prop-2-enenitrile Chemical group C=CC=C.C=CC#N NTXGQCSETZTARF-UHFFFAOYSA-N 0.000 claims description 4
- 229920001568 phenolic resin Polymers 0.000 claims description 4
- 239000005011 phenolic resin Substances 0.000 claims description 4
- 239000002131 composite material Substances 0.000 claims 1
- 239000002783 friction material Substances 0.000 abstract description 18
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 9
- 229910052802 copper Inorganic materials 0.000 abstract description 8
- 239000010949 copper Substances 0.000 abstract description 8
- 229910052751 metal Inorganic materials 0.000 abstract description 7
- 239000002184 metal Substances 0.000 abstract description 7
- 238000005562 fading Methods 0.000 abstract description 5
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000012545 processing Methods 0.000 abstract description 3
- 150000008363 butyronitriles Chemical class 0.000 abstract 1
- 239000000463 material Substances 0.000 description 21
- 239000011248 coating agent Substances 0.000 description 6
- 238000000576 coating method Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 6
- 238000005485 electric heating Methods 0.000 description 6
- 239000012535 impurity Substances 0.000 description 6
- 238000007639 printing Methods 0.000 description 6
- 238000007711 solidification Methods 0.000 description 6
- 230000008023 solidification Effects 0.000 description 6
- 239000007921 spray Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000428 dust Substances 0.000 description 4
- 238000011056 performance test Methods 0.000 description 4
- 239000000126 substance Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 2
- 229910052793 cadmium Inorganic materials 0.000 description 2
- BDOSMKKIYDKNTQ-UHFFFAOYSA-N cadmium atom Chemical compound [Cd] BDOSMKKIYDKNTQ-UHFFFAOYSA-N 0.000 description 2
- 229910010293 ceramic material Inorganic materials 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 2
- 229910052753 mercury Inorganic materials 0.000 description 2
- 239000007769 metal material Substances 0.000 description 2
- 239000010959 steel Substances 0.000 description 2
- 239000011206 ternary composite Substances 0.000 description 2
- 210000002268 wool Anatomy 0.000 description 2
- 206010007269 Carcinogenicity Diseases 0.000 description 1
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 231100000260 carcinogenicity Toxicity 0.000 description 1
- 230000007670 carcinogenicity Effects 0.000 description 1
- 239000003795 chemical substances by application Substances 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- JOPOVCBBYLSVDA-UHFFFAOYSA-N chromium(6+) Chemical compound [Cr+6] JOPOVCBBYLSVDA-UHFFFAOYSA-N 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000011049 filling Methods 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 239000000383 hazardous chemical Substances 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 239000004615 ingredient Substances 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 150000002739 metals Chemical class 0.000 description 1
- 150000002825 nitriles Chemical class 0.000 description 1
- 239000012783 reinforcing fiber Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 231100000331 toxic Toxicity 0.000 description 1
- 230000002588 toxic effect Effects 0.000 description 1
Images
Classifications
-
- 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—Composition of linings ; Methods of manufacturing
- F16D69/023—Composite materials containing carbon and carbon fibres or fibres made of carbonizable material
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
- C09K3/149—Antislip compositions
-
- 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
- F16D2069/002—Combination of different friction materials
-
- 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
-
- 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
- F16D2250/00—Manufacturing; Assembly
- F16D2250/0023—Shaping by pressure
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Materials Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Composite Materials (AREA)
- Mechanical Engineering (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention belongs to the technical field of friction materials, and particularly relates to a copper-free friction lining and a preparation method thereof. The friction lining comprises 9-15 parts of a modified butyronitrile resin adhesive; 4 to 9 parts of a reinforcing agent comprising aramid fibers and/or cellulose fibers; 28 to 53 parts of an abrasive enhancer comprising potassium titanate, abrasive powder, mineral fibers and/or fine rubber powder; 11 to 30 parts of a lubricant comprising synthetic graphite, mica and/or antimony trisulfide; 10 to 20 parts of a filler comprising precipitated barium sulfate or feldspar powder. The friction lining has stable friction performance, heat fading resistance, high structural strength, wear resistance, no copper and other metal components, environmental protection and no pollution, and the preparation method has the characteristics of simple process flow, convenience in production and processing, convenience in raw material selection and low preparation cost.
Description
Technical Field
The invention belongs to the technical field of friction materials, and particularly relates to a copper-free friction lining and a preparation method thereof.
Background
The friction lining is widely applied to brakes and clutches of vehicles such as automobiles, trains, airplanes and the like, and is a component material which performs braking and transmission functions by means of friction. The friction lining is a high molecular ternary composite material, is a physical and chemical complex, and is a product prepared by a series of production and processing, wherein the high molecular ternary composite material consists of three major components of a high molecular binder (resin and rubber), reinforcing fibers, a friction performance regulator and other accessory ingredients. The high-strength wear-resistant rubber has good friction coefficient and wear resistance, and also has certain heat resistance and mechanical strength.
The rapid development of the automobile industry is promoted by the progress of scientific technology, and the working conditions of the friction lining are more and more rigorous. The traditional asbestos friction material product has instantaneous high temperature due to high-speed braking, so that the surface is easy to generate serious heat fading, large braking noise, short service life and strong carcinogenicity, and causes great pollution to the environment.
At present, the brake pad used for automobiles mainly takes semimetal and ceramic materials as main materials. The brake pad made of the semimetal and ceramic materials contains a large amount of nonferrous metals such as copper, steel wool and iron powder, and harmful metal materials such as chromium, cadmium, lead, mercury and the like, copper powder and toxic and harmful substances have certain influence on human bodies and the environment, the restriction requirements on the harmful substances such as copper, hexavalent chromium, cadmium, lead, mercury and the like are all put forward at home and abroad, and the novel pollution-free environment-friendly friction material becomes the key point of research in the friction industry along with the enhancement of environmental awareness of people.
Disclosure of Invention
The invention aims to provide a novel friction lining which has stable friction performance, heat fading resistance, high structural strength, wear resistance, no copper or other metal components, environmental protection and no pollution and a preparation method thereof.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a copper-free friction lining comprising the following components by mass: 9-15 parts of a binder, wherein the binder is a modified butadiene-acrylonitrile resin; 4 to 9 parts of a reinforcing agent comprising aramid fibers and/or cellulose fibers; 28 to 53 parts of an abrasive enhancer comprising potassium titanate, friction powder, mineral fibers and/or fine rubber powder; 11 to 30 parts of a lubricant comprising synthetic graphite, mica, and/or antimony trisulfide; 10 to 20 parts of a filler comprising precipitated barium sulfate or feldspar powder.
Additional features that form a copper-free friction lining as described above further include:
-the nitrile modified resin constituting the adhesive is a nitrile rubber modified phenolic resin; wherein, the phenolic resin accounts for 7-10 parts, and the nitrile-butadiene rubber powder accounts for 2-5 parts;
the reinforcing agent comprises 2-4 parts of aramid fiber and 2-5 parts of cellulose fiber;
the friction enhancer comprises 15-25 parts of potassium titanate, 5-8 parts of friction powder, 5-15 parts of mineral fiber and 3-5 parts of fine rubber powder;
the lubricant comprises 3-5 parts of antimony trisulfide, 5-15 parts of synthetic graphite and 3-10 parts of mica.
Compared with the prior art, the friction lining without copper provided by the invention has the following advantages: firstly, because the components of the novel friction lining do not contain copper and other metal components, dust generated by friction in the using process does not contain hazardous substances, the novel friction lining belongs to a green environment-friendly friction material, has the characteristics of low noise and less dust, has no pollution to the environment, completely meets the increasingly improved environment-friendly requirement, avoids the pollution of heavy metal dust to the environment and the harm to the health of a human body caused by the traditional steel wool or copper-containing metal brake pad, obviously reduces the weight of the friction lining, and realizes the requirement of light weight of the brake pad; secondly, as the aramid fiber and the cellulose fiber are used as reinforcing agents and are mixed and added into the friction material to form a frame support of the lining, when the lining is applied to a friction disc with serious scratch, the partial contact ratio of the friction disc and the lining is too strong to gauge pressure, the strength of the aramid fiber is high, the phenomena of friction disc fragmentation, scratch and shedding are avoided, the structural strength of the friction material is improved due to the simultaneous use of the aramid fiber and the cellulose fiber, and the wear resistance of the lining is remarkably enhanced; thirdly, as the friction enhancer of the gasket uses potassium titanate, the pressure decline can be prevented, the friction coefficient can be effectively stabilized, the braking stability of the friction material is improved, the heat decline phenomenon is avoided, the wear resistance is improved, the wear rate is reduced, and the friction noise is improved; the friction powder in the friction enhancer improves the low-temperature friction coefficient, and meanwhile, after the friction material is carbonized at high temperature, small holes are formed in the friction material and on the surface of the friction material, so that the noise is reduced; mineral fibers in the grinding agent have good temperature resistance and play a role in heat insulation, and high temperature generated by the friction disc is not easily conducted to the lining, so that the friction material is prevented from being seriously carbonized due to high temperature; the fine rubber powder in the friction enhancer has higher temperature resistance, and can reduce the heat fading phenomenon of the friction lining; and the mixed application of the potassium titanate, the friction powder, the fine rubber powder, the synthetic graphite, the mica and other components in the gasket not only well eliminates the driving brake noise, but also solves the problem of low-frequency noise which is difficult to overcome by the formula of semimetal and few metal through the balance of static friction coefficient and dynamic friction coefficient.
The present invention also provides a process for the preparation of the above copper-free friction lining, characterized in that: the method comprises the following steps:
s1, mixing the raw material components in parts by mass;
s2, performing hot-pressing treatment on the mixture subjected to the mixing treatment in the step S1;
and S3, curing the product subjected to the hot pressing treatment in the step S2.
Additional technical features that constitute one of the above-mentioned methods for the production of a copper-free friction lining also include:
in the step S1, aramid fiber, precipitated barium sulfate, nitrile butadiene rubber powder, cellulose fiber and mineral fiber are weighed to obtain a mixture A;
weighing potassium titanate, mica, phenolic resin, friction powder, antimony trisulfide, synthetic graphite and fine rubber powder to obtain a mixture B;
putting the mixture A into a plow harrow type mixer with a reamer, plowing for 15 +/-5 minutes, and operating the reamer for 10 +/-3 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 +/-5 minutes, and operating the reamer for 25 +/-3 minutes to obtain a mixture; wherein, the rotating speed of the coulter is 400 revolutions per minute, the rotating speed of the reamer is 1450 revolutions per minute, and the mixing temperature is not more than 60 ℃.
In step S2, the temperature of the hot-pressing mold is between 135 ℃ and 145 ℃, the pressure is 17 +/-1 MPa, the number of air exhaust times is 4, and the pressure holding time is 360 seconds and 400 seconds.
-in said step S2, the hot-pressed upper and lower heating plates are both temperature-controlled in zones, the left zone temperature of the upper heating plate being between 165 ℃ and 170 ℃, the middle zone temperature being between 155 ℃ and 165 ℃, and the right zone temperature being between 165 ℃ and 170 ℃; the temperature of the left zone of the lower heating plate is between 180 ℃ and 185 ℃, the temperature of the middle zone is between 160 ℃ and 165 ℃, and the temperature of the right zone is between 180 ℃ and 185 ℃.
In step S3, the temperature and time for performing the curing process are: (1) heating to 120 ℃ after 120 minutes at room temperature, and keeping the temperature at 120 ℃ for 120 minutes; (2) heating to 150 ℃ at 120 ℃ for 30 minutes, and keeping the temperature at 150 ℃ for 60 minutes; (3) heating to 180 ℃ after 30 minutes at 150 ℃, and keeping the temperature at 180 ℃ for 60 minutes; (4) raising the temperature to 200 ℃ after 30 minutes at 180 ℃, and keeping the temperature at 200 ℃ for 120 minutes; (5) after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the temperature is naturally reduced to the room temperature.
-further comprising step S4: the friction lining subjected to the curing treatment of step S3 is subjected to polishing, grinding, and spraying treatments.
The preparation method has the advantages of simple process flow, convenience in production and processing, convenience in raw material selection, low preparation cost, excellent comprehensive performance of the manufactured friction lining, no metal dust and noise pollution, environmental friendliness, stable friction, heat fading resistance, high mechanical strength, wear resistance, long service life and the like, and the preparation method is simple and suitable for popularization.
Drawings
FIG. 1 shows the results of the overall performance test of a copper-free friction lining according to the invention (example one);
FIG. 2 shows the results of a test of the overall properties of a copper-free friction lining according to the invention (example II);
FIG. 3 shows the results of a comprehensive performance test of a copper-free friction lining according to the invention (example III);
FIG. 4 shows the results of the comprehensive property test of a copper-free friction lining according to the invention (example four)
FIG. 5 shows the results of the comprehensive performance test of a copper-free friction lining according to the invention (example five)
FIG. 6 shows the results of the overall performance test of a copper-free friction lining according to the invention (example six).
Detailed Description
The following further describes embodiments of the present invention with reference to examples. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
Example one
1. Material taking
Weighing the following raw materials in percentage by mass: 2 parts of aramid fiber, 15 parts of precipitated barium sulfate, 4 parts of nitrile-butadiene rubber powder, 5 parts of cellulose fiber and 15 parts of mineral fiber to obtain a mixture A;
weighing 20 parts of potassium titanate, 4 parts of mica, 7 parts of resin, 5 parts of friction powder, 5 parts of antimony trisulfide, 15 parts of synthetic graphite and 3 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the upper and lower heating plates and the mold temperature were set as shown in Table 1, and the working pressure was set at 16MPa, and the evacuation was performed once at 15-second intervals for 4 times and the pressure-holding time was 360 seconds.
TABLE 1
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in FIG. 1:
example two
1. Material taking
Weighing the following raw materials in percentage by mass: 4 parts of aramid fiber, 10 parts of precipitated barium sulfate, 5 parts of nitrile-butadiene rubber powder, 5 parts of cellulose fiber and 15 parts of mineral fiber to obtain a mixture A;
weighing 20 parts of potassium titanate, 8 parts of mica, 10 parts of resin, 5 parts of friction powder, 5 parts of antimony trisulfide, 10 parts of synthetic graphite and 3 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the upper and lower heating plates and the mold temperature were set as shown in Table 2, and the working pressure was set at 16MPa, and the evacuation was performed once at 15-second intervals for 4 times and the pressure holding time was 400 seconds.
TABLE 2
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in figure 2:
EXAMPLE III
1. Material taking
Weighing the following raw materials in percentage by mass: 4 parts of aramid fiber, 20 parts of precipitated barium sulfate, 3 parts of nitrile-butadiene rubber powder, 4 parts of cellulose fiber and 10 parts of mineral fiber to obtain a mixture A;
weighing 25 parts of potassium titanate, 10 parts of mica, 9 parts of resin, 6 parts of friction powder, 4 parts of antimony trisulfide, 15 parts of synthetic graphite and 4 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the temperature of the upper heating plate, the temperature of the lower heating plate, and the temperature of the mold were set as shown in Table 3, and the working pressure was set at 18MPa, and the evacuation was performed once at an interval of 15 seconds for a total of 4 evacuations and a pressure-holding time of 360 seconds.
TABLE 3
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in figure 3:
example four
1. Material taking
Weighing the following raw materials in percentage by mass: 3 parts of aramid fiber, 15 parts of precipitated barium sulfate, 4 parts of nitrile-butadiene rubber powder, 5 parts of cellulose fiber and 15 parts of mineral fiber to obtain a mixture A;
weighing 15 parts of potassium titanate, 8 parts of mica, 7 parts of resin, 8 parts of friction powder, 5 parts of antimony trisulfide, 10 parts of synthetic graphite and 5 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the upper and lower heating plates and the mold temperature were set as shown in Table 4, and the working pressure was set at 18MPa, and the evacuation was performed once at 15-second intervals for 4 times and the pressure holding time was 400 seconds.
TABLE 4
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in figure 4:
EXAMPLE five
1. Material taking
Weighing the following raw materials in percentage by mass: 4 parts of aramid fiber, 15 parts of precipitated barium sulfate, 5 parts of nitrile-butadiene rubber powder, 5 parts of cellulose fiber and 10 parts of mineral fiber to obtain a mixture A;
weighing 20 parts of potassium titanate, 10 parts of mica, 8 parts of resin, 5 parts of friction powder, 4 parts of antimony trisulfide, 10 parts of synthetic graphite and 4 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the upper and lower heating plates and the mold temperature were set as shown in Table 5, and the working pressure was set at 17MPa, and the evacuation was performed once at 15-second intervals for 4 times and the pressure-holding time was 360 seconds.
TABLE 5
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in figure 5:
EXAMPLE six
1. Material taking
Weighing the following raw materials in percentage by mass: 4 parts of aramid fiber, 10 parts of feldspar powder, 5 parts of nitrile-butadiene rubber powder, 5 parts of cellulose fiber and 15 parts of mineral fiber to obtain a mixture A;
weighing 20 parts of potassium titanate, 8 parts of mica, 8 parts of resin, 5 parts of friction powder, 5 parts of antimony trisulfide, 10 parts of synthetic graphite and 5 parts of fine rubber powder to obtain a mixture B.
2. Mixing material
Putting the mixture A into a plow rake type mixer with a reamer, plowing for 15 minutes, and operating the reamer for 10 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 minutes, and operating the reamer for 25 minutes to obtain a mixture; wherein the rotation speed of the coulter is 400 r/min, the rotation speed of the reamer is 1450 r/min, and the mixing temperature is not more than 60 DEG C
3. Hot pressing
A mold of a predetermined type was set on a 200T hydraulic press, and the upper and lower heating plates and the mold temperature were set as shown in Table 6, and the working pressure was set at 17MPa, and the evacuation was performed once at 15-second intervals for 4 times and the pressure holding time was 400 seconds.
TABLE 6
And when the actual temperature reaches the set requirement, putting the weighed mixture into a mold cavity, and performing air exhaust and pressure maintaining according to the process to prepare the semi-finished friction lining.
4. Curing by heat treatment
And (3) placing the semi-finished friction plate after hot pressing in an electric heating oven, and further heating and curing according to the following requirements to fully react various raw and auxiliary materials so as to achieve an ideal braking effect.
The process requirements are as follows: raising the temperature to 120 ℃ after 120 minutes at room temperature and keeping the temperature for 120 minutes;
heating to 150 ℃ after 30 minutes at 120 ℃ and keeping the temperature for 60 minutes;
heating to 180 ℃ after 30 minutes at 150 ℃ and keeping the temperature for 60 minutes;
heating to 200 ℃ for 30 minutes at 180 ℃ and keeping the temperature for 120 minutes;
after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the oven is opened and the temperature is naturally reduced to the room temperature.
5. Subsequent treatment
After the heat treatment and solidification are finished, performing surface polishing treatment on the product, and removing impurities adhered to the back plate; grinding the surface of the friction material according to the standard required size to enable the surface to meet the assembly requirement; spraying an antirust coating on the surface of the product; after all the products are detected to meet the standard requirements, the spray printing marks are packaged and put in storage.
6. The experimental data for this example are shown in figure 6:
and (3) comprehensive evaluation:
after the detection of the products processed by the schemes, all indexes basically meet the design requirements, and copper and all metal materials are not found. However, in the test results, the product wear rate is larger when the resin content is lower, and the high-temperature friction performance of the friction plate is directly influenced by the content of the fine rubber powder. The structural performance of the friction plate is influenced by the amount of the aramid fiber. Precipitated barium sulfate belongs to a filling material, and various indexes meet design requirements after feldspar powder is used for replacement in the sixth embodiment.
Claims (11)
1. A copper-free friction lining characterized by: the composite material comprises the following components in parts by mass: 9-15 parts of a binder, wherein the binder is a modified butadiene-acrylonitrile resin; 4 to 9 parts of a reinforcing agent comprising aramid fibers and/or cellulose fibers; 28 to 53 parts of an abrasive enhancer comprising potassium titanate, friction powder, mineral fibers and/or fine rubber powder; 11 to 30 parts of a lubricant comprising synthetic graphite, mica, and/or antimony trisulfide; 10 to 20 parts of a filler comprising precipitated barium sulfate or feldspar powder.
2. A copper-free friction lining according to claim 1 wherein: the butadiene-acrylonitrile modified resin forming the adhesive is butadiene-acrylonitrile rubber modified phenolic resin; wherein, the phenolic resin accounts for 7-10 parts, and the nitrile-butadiene rubber powder accounts for 2-5 parts.
3. A copper-free friction lining according to claim 1 wherein: the reinforcing agent comprises 2-4 parts of aramid fiber and 2-5 parts of cellulose fiber.
4. A copper-free friction lining according to claim 1 wherein: the friction enhancer comprises 15-25 parts of potassium titanate, 5-8 parts of friction powder, 5-15 parts of mineral fiber and 3-5 parts of fine rubber powder.
5. A copper-free friction lining according to claim 1 wherein: the lubricant comprises 3-5 parts of antimony trisulfide, 5-15 parts of synthetic graphite and 3-10 parts of mica.
6. A method of making a copper-free friction lining, comprising: a friction lining for making a copper-free friction lining according to claims 1 to 5 comprising the steps of:
s1, mixing the raw material components in parts by mass;
s2, performing hot-pressing treatment on the mixture subjected to the mixing treatment in the step S1;
and S3, curing the product subjected to the hot pressing treatment in the step S2.
7. The method of making a copper-free friction lining according to claim 6, wherein: in the step S1, weighing aramid fiber, precipitated barium sulfate, nitrile-butadiene rubber powder, cellulose fiber and mineral fiber to obtain a mixture A;
weighing potassium titanate, mica, phenolic resin, friction powder, antimony trisulfide, synthetic graphite and fine rubber powder to obtain a mixture B;
putting the mixture A into a plow harrow type mixer with a reamer, plowing for 15 +/-5 minutes, and operating the reamer for 10 +/-3 minutes; adding the mixture B to mix with the mixture A, ploughing for 30 +/-5 minutes, and operating the reamer for 25 +/-3 minutes to obtain a mixture; wherein, the rotating speed of the coulter is 400 revolutions per minute, the rotating speed of the reamer is 1450 revolutions per minute, and the mixing temperature is not more than 60 ℃.
8. A method of making a copper-free friction lining according to claim 7 wherein: in the step S2, the temperature of the hot-pressing mold is between 135 ℃ and 145 ℃, the pressure is 17 +/-1 MPa, the number of air exhaust times is 4, and the pressure maintaining time is 360 seconds and 400 seconds.
9. A method of making a copper-free friction lining according to claim 8, wherein: in the step S2, the upper heating plate and the lower heating plate of the hot press are both temperature-controlled in different zones, the temperature of the left zone of the upper heating plate is between 165 ℃ and 170 ℃, the temperature of the middle zone is between 155 ℃ and 165 ℃, and the temperature of the right zone is between 165 ℃ and 170 ℃; the temperature of the left zone of the lower heating plate is between 180 ℃ and 185 ℃, the temperature of the middle zone is between 160 ℃ and 165 ℃, and the temperature of the right zone is between 180 ℃ and 185 ℃.
10. A method of making a copper-free friction lining according to claim 7 wherein: in step S3, the temperature and time for performing the curing process are:
(1) heating to 120 ℃ after 120 minutes at room temperature, and keeping the temperature at 120 ℃ for 120 minutes; (2) heating to 150 ℃ at 120 ℃ for 30 minutes, and keeping the temperature at 150 ℃ for 60 minutes; (3) heating to 180 ℃ after 30 minutes at 150 ℃, and keeping the temperature at 180 ℃ for 60 minutes; (4) raising the temperature to 200 ℃ after 30 minutes at 180 ℃, and keeping the temperature at 200 ℃ for 120 minutes; (5) after the temperature is reduced to 100 ℃ after 150 minutes at 200 ℃, the temperature is naturally reduced to the room temperature.
11. A method of making a copper-free friction lining according to claim 7 wherein: further comprising step S4: the friction lining subjected to the curing treatment of step S3 is subjected to polishing, grinding, and spraying treatments.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010375809.8A CN111350781A (en) | 2020-05-07 | 2020-05-07 | Copper-free friction lining and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010375809.8A CN111350781A (en) | 2020-05-07 | 2020-05-07 | Copper-free friction lining and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111350781A true CN111350781A (en) | 2020-06-30 |
Family
ID=71193565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010375809.8A Pending CN111350781A (en) | 2020-05-07 | 2020-05-07 | Copper-free friction lining and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111350781A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085488A (en) * | 2021-10-11 | 2022-02-25 | 江苏大学 | Preparation method of granulating material for friction material and application of granulating material in copper-free NAO type brake pad for high-end agricultural equipment |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880435A (en) * | 2010-06-21 | 2010-11-10 | 临安华龙摩擦材料有限公司 | Friction braking plate for pneumatic clutch and preparation method thereof |
| CN102003480A (en) * | 2010-10-19 | 2011-04-06 | 临安华龙摩擦材料有限公司 | Wind driven generator damping friction braking plate and preparation method thereof |
| JP2016074812A (en) * | 2014-10-06 | 2016-05-12 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the friction material composition |
| CN105670564A (en) * | 2016-01-08 | 2016-06-15 | 北京天宜上佳新材料有限公司 | Copper-free friction material and brake pad |
| CN106634832A (en) * | 2016-12-15 | 2017-05-10 | 珠海格莱利摩擦材料有限公司 | Copper-free environmental-friendly NAO (no asbestos) friction material and preparation method thereof |
| CN109780101A (en) * | 2018-10-22 | 2019-05-21 | 泰明顿摩擦材料技术(上海)有限公司 | A kind of Non-copper friction material and preparation method thereof |
-
2020
- 2020-05-07 CN CN202010375809.8A patent/CN111350781A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101880435A (en) * | 2010-06-21 | 2010-11-10 | 临安华龙摩擦材料有限公司 | Friction braking plate for pneumatic clutch and preparation method thereof |
| CN102003480A (en) * | 2010-10-19 | 2011-04-06 | 临安华龙摩擦材料有限公司 | Wind driven generator damping friction braking plate and preparation method thereof |
| JP2016074812A (en) * | 2014-10-06 | 2016-05-12 | 日本ブレーキ工業株式会社 | Friction material composition, and friction material and friction member using the friction material composition |
| CN105670564A (en) * | 2016-01-08 | 2016-06-15 | 北京天宜上佳新材料有限公司 | Copper-free friction material and brake pad |
| CN106634832A (en) * | 2016-12-15 | 2017-05-10 | 珠海格莱利摩擦材料有限公司 | Copper-free environmental-friendly NAO (no asbestos) friction material and preparation method thereof |
| CN109780101A (en) * | 2018-10-22 | 2019-05-21 | 泰明顿摩擦材料技术(上海)有限公司 | A kind of Non-copper friction material and preparation method thereof |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114085488A (en) * | 2021-10-11 | 2022-02-25 | 江苏大学 | Preparation method of granulating material for friction material and application of granulating material in copper-free NAO type brake pad for high-end agricultural equipment |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN100424120C (en) | Friction material for vehicles without asbestos and metal | |
| CN101476608B (en) | Carbon fiber ceramic nano-silicate high-strength vehicle brake friction sheet | |
| CN101177601A (en) | Method for preparing brake block by calcium sulfate crystal whisker | |
| CN101555399A (en) | Novel brake pad material of truck | |
| CN106674883A (en) | Composite brake pad with stable performance | |
| CN105240429A (en) | Vanadium-contained semimetallic brake block | |
| CN106051006A (en) | Rare-earth oxide modified resin-based automotive brake friction material and preparation method thereof | |
| CN108488281B (en) | Wear-resistant low-noise automobile brake pad and preparation method thereof | |
| CN109139755B (en) | Preparation method of iron-copper-based composite friction material | |
| CN106763365A (en) | A kind of high intensity low abrasion brake block | |
| CN111875923B (en) | Motor train unit grinding device with good shape modification effect and without producing metal inlay | |
| CN108250667B (en) | Wear-resistant brake friction material and preparation method thereof | |
| CN109929511B (en) | Copper-free and antimony-free environment-friendly friction material, friction plate, preparation method and application | |
| CN117448623B (en) | Copper-based composite friction material containing modified sepiolite, and preparation method and application thereof | |
| CN111350781A (en) | Copper-free friction lining and preparation method thereof | |
| CN110594323A (en) | Composite double-layer brake pad and preparation method thereof | |
| CN109780102A (en) | A kind of preparation method of motorbus graphene modified aluminas fibre reinforced composites brake block | |
| CN101813149B (en) | Low-metal ceramic-based drum-type brake pad and preparation method thereof | |
| CN106086718A (en) | A kind of clutch iron base composite friction material and preparation method thereof | |
| CN102634320A (en) | Material of high-wear-resistance ceramic automobile brake block and preparation method thereof | |
| CN1493641A (en) | Environment-friendly brake material | |
| CN105605131A (en) | Manufacturing method of brake pad for heavy machine | |
| CN115975336A (en) | Low-noise friction material and preparation method and application thereof | |
| CN1228448A (en) | Carbon fibre friction facing for brake device | |
| KR20100073763A (en) | A low-steel type friction material and a brake for vehicle comprising the low-steel type friction material |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200630 |
|
| RJ01 | Rejection of invention patent application after publication |