CN104789190A - Preparation method of modified SiC-Al automobile brake material - Google Patents
Preparation method of modified SiC-Al automobile brake material Download PDFInfo
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Abstract
The invention discloses a preparation method of a modified SiC-Al automobile brake material, and belongs to the technical field of brake materials. The preparation method comprises the following steps: step 1: mixing SiC micro powder with an organic solvent, under the protection of N2, adding a silane coupling agent, raising the temperature for performing reaction, after the reaction is completed, lowering the temperature, filtering, cleaning a filter cake with ethanol, and drying, so as to obtain modified SiC micro powder of a coupling agent; step 2: adding water to the modified SiC micro powder of the coupling agent, then adding acrylamide, aluminium oxide powder and an initiating agent, under the protection of the N2, raising the temperature for performing reaction, after the reaction is completed, lowering the temperature, filtering, cleaning the filter cake with the ethanol, and drying, so as to obtain coated modified SiC micro powder; step 3: under the protection of the N2, sintering the coated modified SiC micro powder so as to obtain sintered particles; step 4: putting aluminum alloy in a crucible, heating, then adding the sintered particles, stirring, and pouring into a sample after stirring, so as to obtain the modified SiC-Al automobile brake material.
Description
Technical field
The present invention discloses a kind of preparation method of modification SiC-Al automotive brake material, belongs to brake material technical field.
Background technology
During running car, in the feelings situation of snub, working face is subject to the effect of the huge frictional force that braking mechanism applies and automobile is stopped within all seconds, and the kinetic energy of automobile is fricative heat energy at Transient transformation.Change into heat due to fricative energy and absorbed by brake facing, causing brake-block temperature to raise, top temperature can reach 600 DEG C.Brake facing thermal conductivity should be good, can be left by the heat of generation rapidly, otherwise, can cause damage to brake facing itself and wheel.Brake facing relies on frictional force to brake exactly, and from the angle of safety, its greatest wear amount one side scrapped of general provision is not more than 1 millimeter, and be not difficult to find out from this point, the material of brake facing should have very high abrasion resistance properties.
At present, the automobile brake sheet overwhelming majority both domestic and external adopts cast iron manufacture, and the shortcoming of existence is more.(1) due to the restriction of casting technique, the poor dimensional precision of foundry goods, the whole surface of brake facing all needs to carry out mechanical workout.After the graphitic cast iron brake facing of casting carries out machining removing foundry goods crust, due to the elimination of the internal stress of foundry goods, the distortion of foundry goods will inevitably be caused, therefore size and the tighter brake facing of shape requirement have to additionally increase machining allowance, are convenient to carry out precision work.Through repeatedly processing, using rate of metal is low, and the manufacturing cycle is long, and production cost greatly increases.(2) poor thermal conductivity of cast iron brake facing, cast iron brake facing makes its surface temperature up to 600 DEG C because of drag friction heating, and its working surface temperature is very high and thermograde large, easily forms focus and produces hot tearing.
From the sixties in 20th century, the s-generation brake facing of the national spread use such as U.S., Europe, day is the sesame of semimetal graphite matrix material manufacture.Its main component is steel fiber, graphite, metal powder and auxiliary material thereof, uses modified phenolic resins molding bonded.Semi-metallic brake pad improves more than 2590 than asbestos brake lining wear resistance, and frictional coefficient is high, thermal conductivity processes easy-formation well.Meanwhile, this brake facing also occur that steel fiber easily gets rusty in wet environment, brake time the shortcomings such as noise is large.
Summary of the invention
The object of the invention is: the problem that hardness is not high, thermal conductivity is bad solving SiC-Al brake material, mainly by carrying out improvement to SiC particle and coated mode solves, concrete technical scheme is:
A preparation method for modification SiC-Al automotive brake material, comprises the steps:
1st step, by weight, the organic solvent of SiC micro mist 30 ~ 50 parts with 200 ~ 400 parts to be mixed, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 85 ~ 95 DEG C, react, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 500 ~ 800 parts of water, then add acrylamide, alumina powder 10 ~ 15 parts and 5 ~ 10 parts of initiators of 200 ~ 400 parts, at N
2protection under be warming up to 50 ~ 60 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 600 ~ 700 DEG C sintering 2 ~ 4 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy, be heated to 700 ~ 720 DEG C, then add the sintered particles being preheated to 200 ~ 240 DEG C, stir, end after-pouring is sample, obtains friction materials.
In the 1st described step, organic solvent is one or several the mixture in toluene, methylene dichloride or acetic acid ethyl ester.
In the 1st described step, the size range of SiC micro mist at 0.5 ~ 5 μm, content>=98%, specific surface area>=2m
2g
-1.
In the 1st described step, 4 ~ 6 hours reaction times.
In the 2nd described step, the size range of alumina powder 0.1 ~ 1 μm.
In the 2nd described step, initiator is hydrogen peroxide.
In the 4th described step, churning time is 1 ~ 3 hour.
In the 4th described step, described aluminium alloy refers to that alloy designations is the aluminium alloy of ZL102.
In the 4th described step, the weight ratio of sintered particles and aluminium alloy is 1:8 ~ 12.
beneficial effect
The present invention is undertaken silane coupler modified by the surface of SiC micro mist, simultaneously can the surface of modified oxidized aluminium powder form, make two alumina particles can be coated on the surface of SiC micro mist, again after oversintering, alumina particle can be covered in the surface of SiC, again SiC is added in aluminium alloy, SiC problem pockety in aluminium alloy can be overcome preferably, improve thermal conductivity.
Embodiment
Embodiment 1
1st step, by weight, by SiC micro mist (size range at 0.5 ~ 5 μm, content 98%, specific surface area 5m
2g
-1) 30 parts mix with the methylene dichloride of 200 parts, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 85 DEG C, react, 4 hours reaction times, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 500 parts of water, then add acrylamide, alumina powder (size range 0.1 ~ 1 μm) 10 parts and 5 parts of initiator hydrogen peroxide of 200 parts, at N
2protection under be warming up to 50 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 600 ~ 700 DEG C sintering 2 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy ZL102, be heated to 700 DEG C, then add the sintered particles being preheated to 200 DEG C, the weight ratio of sintered particles and aluminium alloy is 1:10, stirs, and churning time is 1 hour, and end after-pouring is sample, obtains friction materials.
Embodiment 2
1st step, by weight, by SiC micro mist (size range at 0.5 ~ 5 μm, content 98%, specific surface area 5m
2g
-1) 50 parts mix with the methylene dichloride of 400 parts, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 95 DEG C, react, 6 hours reaction times, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 800 parts of water, then add acrylamide, alumina powder (size range 0.1 ~ 1 μm) 15 parts and 10 parts of initiator hydrogen peroxide of 400 parts, at N
2protection under be warming up to 60 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 00 DEG C sintering 4 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy ZL102, be heated to 720 DEG C, then add the sintered particles being preheated to 240 DEG C, the weight ratio of sintered particles and aluminium alloy is 1:10, stirs, and churning time is 3 hours, and end after-pouring is sample, obtains friction materials.
Embodiment 3
1st step, by weight, by SiC micro mist (size range at 0.5 ~ 5 μm, content 98%, specific surface area 5m
2g
-1) 40 parts mix with the methylene dichloride of 200 ~ 400 parts, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 90 DEG C, react, 5 hours reaction times, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 700 parts of water, then add acrylamide, alumina powder (size range 0.1 ~ 1 μm) 12 parts and 7 parts of initiator hydrogen peroxide of 300 parts, at N
2protection under be warming up to 55 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 650 DEG C sintering 3 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy ZL102, be heated to 710 DEG C, then add the sintered particles being preheated to 220 DEG C, the weight ratio of sintered particles and aluminium alloy is 1:10, stirs, and churning time is 2 hours, and end after-pouring is sample, obtains friction materials.
Reference examples
Be with the difference of embodiment 3: the alumina powder in the 2nd adds in the 4th step.
1st step, by weight, by SiC micro mist (size range at 0.5 ~ 5 μm, content 98%, specific surface area 5m
2g
-1) 40 parts mix with the methylene dichloride of 200 ~ 400 parts, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 90 DEG C, react, 5 hours reaction times, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 700 parts of water, then add acrylamide and 7 parts of initiator hydrogen peroxide of 300 parts, at N
2protection under be warming up to 55 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 650 DEG C sintering 3 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy ZL102, be heated to 710 DEG C, add the sintered particles being preheated to 220 DEG C again, and alumina powder (size range 0.1 ~ 1 μm) 12 parts, the weight ratio of sintered particles and aluminium alloy is 1:10, stirs, and churning time is 2 hours, end after-pouring is sample, obtains friction materials.
Performance test
Brake material is tested its room temperature tensile properties according to GB228, adopts thermal conductivity tester to measure its thermal conductivity (at 200 DEG C).
。
As can be seen from the table, automotive brake material provided by the invention has good intensive parameter and thermal conductivity, wherein, reference examples can be found out compared with embodiment 3, after being sintered again by surface alumina powder being coated on SiC, effectively can improve the dispersiveness of modification SiC micro mist in Al, improve intensity and thermal conductivity.
Claims (9)
1. a preparation method for modification SiC-Al automotive brake material, is characterized in that, comprises the steps:
1st step, by weight, the organic solvent of SiC micro mist 30 ~ 50 parts with 200 ~ 400 parts to be mixed, then at N
2protection under, add silane resin acceptor kh-550 30 parts, be warming up to 85 ~ 95 DEG C, react, terminate rear cooling filter, use ethanol purge filter cake, dry, obtain coupling agent modified SiC micro mist;
2nd step, coupling agent modified SiC micro mist to be added in 500 ~ 800 parts of water, then add acrylamide, alumina powder 10 ~ 15 parts and 5 ~ 10 parts of initiators of 200 ~ 400 parts, at N
2protection under be warming up to 50 ~ 60 DEG C, react, terminate rear cooling, after filtration, use ethanol purge filter cake, dry, obtain coating modification SiC micro mist;
3rd step, by the SiC micro mist of coating modification at N
2protection under, in 600 ~ 700 DEG C sintering 2 ~ 4 hours, obtain sintered particles;
4th step, in crucible, put into aluminium alloy, be heated to 700 ~ 720 DEG C, then add the sintered particles being preheated to 200 ~ 240 DEG C, stir, end after-pouring is sample, obtains friction materials.
2. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 1st described step, and organic solvent is one or several the mixture in toluene, methylene dichloride or acetic acid ethyl ester.
3. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 1st described step, the size range of SiC micro mist at 0.5 ~ 5 μm, content>=98%, specific surface area>=2m
2g
-1.
4. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 1st described step, 4 ~ 6 hours reaction times.
5. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 2nd described step, the size range of alumina powder 0.1 ~ 1 μm.
6. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 2nd described step, initiator is hydrogen peroxide.
7. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 4th described step, churning time is 1 ~ 3 hour.
8. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 4th described step, and described aluminium alloy refers to that alloy designations is the aluminium alloy of ZL102.
9. the preparation method of modification SiC-Al automotive brake material according to claim 1, is characterized in that: in the 4th described step, the weight ratio of sintered particles and aluminium alloy is 1:8 ~ 12.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280276A (en) * | 2018-10-17 | 2019-01-29 | 安庆市泽烨新材料技术推广服务有限公司 | Antibacterial glass fiber reinforced polypropylene composite material and preparation method thereof |
| CN109337210A (en) * | 2018-10-17 | 2019-02-15 | 安庆市泽烨新材料技术推广服务有限公司 | Fire-retardant low warp glass fiber reinforced polypropylene compound material and preparation method thereof |
| CN109354776A (en) * | 2018-10-17 | 2019-02-19 | 安庆市泽烨新材料技术推广服务有限公司 | Low warpage long fibre enhanced polypropylene composite material and preparation method |
| CN109354777A (en) * | 2018-10-17 | 2019-02-19 | 安庆市泽烨新材料技术推广服务有限公司 | Low warpage PP composite material and preparation method thereof |
| CN109467819A (en) * | 2018-10-17 | 2019-03-15 | 安庆市泽烨新材料技术推广服务有限公司 | Low warp glass fiber reinforced polypropylene compound material and preparation method thereof |
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| WO1994004627A1 (en) * | 1992-08-11 | 1994-03-03 | Toshikazu Tabata | Solid buffing agent |
| CN102102158A (en) * | 2011-01-30 | 2011-06-22 | 中国科学院苏州纳米技术与纳米仿生研究所 | Micro-nano particle reinforced aluminum-based composite material and preparation method thereof |
| CN103697096A (en) * | 2013-12-24 | 2014-04-02 | 河北星月制动元件有限公司 | Drum-type parking brake lining for automobile and manufacturing method thereof |
| CN104311034A (en) * | 2014-10-10 | 2015-01-28 | 山东正诺集团有限公司 | Preparation method for carbon/silicon carbide composite material for automobile brake disc |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1994004627A1 (en) * | 1992-08-11 | 1994-03-03 | Toshikazu Tabata | Solid buffing agent |
| CN102102158A (en) * | 2011-01-30 | 2011-06-22 | 中国科学院苏州纳米技术与纳米仿生研究所 | Micro-nano particle reinforced aluminum-based composite material and preparation method thereof |
| CN103697096A (en) * | 2013-12-24 | 2014-04-02 | 河北星月制动元件有限公司 | Drum-type parking brake lining for automobile and manufacturing method thereof |
| CN104311034A (en) * | 2014-10-10 | 2015-01-28 | 山东正诺集团有限公司 | Preparation method for carbon/silicon carbide composite material for automobile brake disc |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109280276A (en) * | 2018-10-17 | 2019-01-29 | 安庆市泽烨新材料技术推广服务有限公司 | Antibacterial glass fiber reinforced polypropylene composite material and preparation method thereof |
| CN109337210A (en) * | 2018-10-17 | 2019-02-15 | 安庆市泽烨新材料技术推广服务有限公司 | Fire-retardant low warp glass fiber reinforced polypropylene compound material and preparation method thereof |
| CN109354776A (en) * | 2018-10-17 | 2019-02-19 | 安庆市泽烨新材料技术推广服务有限公司 | Low warpage long fibre enhanced polypropylene composite material and preparation method |
| CN109354777A (en) * | 2018-10-17 | 2019-02-19 | 安庆市泽烨新材料技术推广服务有限公司 | Low warpage PP composite material and preparation method thereof |
| CN109467819A (en) * | 2018-10-17 | 2019-03-15 | 安庆市泽烨新材料技术推广服务有限公司 | Low warp glass fiber reinforced polypropylene compound material and preparation method thereof |
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