CN110005735A - A kind of high-speed train braking friction block and preparation method thereof - Google Patents
A kind of high-speed train braking friction block and preparation method thereof Download PDFInfo
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- CN110005735A CN110005735A CN201910122149.XA CN201910122149A CN110005735A CN 110005735 A CN110005735 A CN 110005735A CN 201910122149 A CN201910122149 A CN 201910122149A CN 110005735 A CN110005735 A CN 110005735A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 13
- 230000007704 transition Effects 0.000 claims abstract description 65
- 241000357293 Leptobrama muelleri Species 0.000 claims abstract description 45
- 239000000843 powder Substances 0.000 claims description 57
- 239000000203 mixture Substances 0.000 claims description 41
- 238000005245 sintering Methods 0.000 claims description 38
- 239000002994 raw material Substances 0.000 claims description 25
- 239000000463 material Substances 0.000 claims description 23
- 238000000748 compression moulding Methods 0.000 claims description 22
- 229910000831 Steel Inorganic materials 0.000 claims description 11
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 11
- 239000010959 steel Substances 0.000 claims description 11
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 9
- 238000005915 ammonolysis reaction Methods 0.000 claims description 9
- 229910002804 graphite Inorganic materials 0.000 claims description 9
- 239000010439 graphite Substances 0.000 claims description 9
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 claims description 7
- 229910052681 coesite Inorganic materials 0.000 claims description 7
- 229910052593 corundum Inorganic materials 0.000 claims description 7
- 229910052906 cristobalite Inorganic materials 0.000 claims description 7
- 229910052961 molybdenite Inorganic materials 0.000 claims description 7
- 229910052982 molybdenum disulfide Inorganic materials 0.000 claims description 7
- 239000000377 silicon dioxide Substances 0.000 claims description 7
- 229910052682 stishovite Inorganic materials 0.000 claims description 7
- 229910052905 tridymite Inorganic materials 0.000 claims description 7
- 229910001845 yogo sapphire Inorganic materials 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 5
- 239000000853 adhesive Substances 0.000 abstract description 11
- 230000001070 adhesive effect Effects 0.000 abstract description 11
- 238000000034 method Methods 0.000 abstract description 4
- 238000004519 manufacturing process Methods 0.000 abstract 1
- 239000010949 copper Substances 0.000 description 22
- 239000011159 matrix material Substances 0.000 description 11
- 239000007789 gas Substances 0.000 description 10
- 230000000052 comparative effect Effects 0.000 description 9
- 238000002156 mixing Methods 0.000 description 8
- 238000012360 testing method Methods 0.000 description 8
- 229910052802 copper Inorganic materials 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 4
- CWQXQMHSOZUFJS-UHFFFAOYSA-N molybdenum disulfide Chemical compound S=[Mo]=S CWQXQMHSOZUFJS-UHFFFAOYSA-N 0.000 description 4
- 238000002791 soaking Methods 0.000 description 4
- 229910052718 tin Inorganic materials 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 239000006104 solid solution Substances 0.000 description 3
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000001257 hydrogen Substances 0.000 description 2
- 229910052739 hydrogen Inorganic materials 0.000 description 2
- 238000010348 incorporation Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- 238000005461 lubrication Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 206010054949 Metaplasia Diseases 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 230000015689 metaplastic ossification Effects 0.000 description 1
- XZWYZXLIPXDOLR-UHFFFAOYSA-N metformin Chemical compound CN(C)C(=N)NC(N)=N XZWYZXLIPXDOLR-UHFFFAOYSA-N 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000004663 powder metallurgy Methods 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C9/00—Alloys based on copper
-
- 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
- F16D69/027—Compositions based on metals or inorganic oxides
-
- 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
- F16D69/04—Attachment of linings
-
- 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
- F16D69/04—Attachment of linings
- F16D2069/0425—Attachment methods or devices
- F16D2069/045—Bonding
- F16D2069/0458—Bonding metallurgic, e.g. welding, brazing, sintering
-
- 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
- F16D2200/0004—Materials; Production methods therefor metallic
- F16D2200/0026—Non-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
- F16D2200/0069—Materials; Production methods therefor containing fibres or particles being characterised by their size
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Composite Materials (AREA)
- Manufacturing & Machinery (AREA)
- Inorganic Chemistry (AREA)
- Powder Metallurgy (AREA)
Abstract
The present invention provides a kind of high-speed train braking friction blocks, belong to train braking technical field.High-speed train braking friction block provided by the invention includes small steel back, friction piece and the transition zone being arranged between small steel back and friction piece.The present invention is by adding transition zone between small steel back and friction piece, improve the shear strength of high-speed train braking friction block, bond small steel back with friction piece stronger, embodiment the result shows that, the shear strength of high-speed train braking friction block adhesive surface provided by the invention improves 137% compared with the 7MPa that the provisional technical conditions of EMU require up to 16.65MPa or more.Meanwhile the present invention provides a kind of preparation method of high-speed train braking friction block, this method is simple and easy, it is easy to accomplish industrialized production.
Description
Technical field
The present invention relates to train braking field, in particular to a kind of high-speed train braking friction block and preparation method thereof.
Background technique
The overall trip speed of China's high-speed rail is mostly in 300~350km/h, train meeting in normal brake application especially emergency braking
Powerful thermal shock generated to braking position, braking position bear this thermal shock critical component be brake block friction
Block.
High-speed rail brake block is with friction block generally by the small steel back of copper facing (hereinafter referred to as small steel back) and copper-base powder metallurgy friction
Body (hereinafter referred to as friction piece) two parts composition.Small steel back and friction piece are tentatively bonded after compacting, in follow-up sintering
The two is further bonded, though however the two has certain adhesion strength, since the two material is different, adhesion strength is not
It is very high.But when braking to train, if there are problems for small steel back and the adhesion strength of friction piece, there will be friction pieces
The risk fallen, as brake component most important in train operation, the falling of friction piece, which is likely to result in train, to advise
Parking, is likely to result in great railway accident in set a distance when serious.
Summary of the invention
In view of this, it is an object of that present invention to provide a kind of high-speed train braking friction blocks and preparation method thereof.The present invention
The high-speed train braking friction block shear strength of offer is high, can greatly improve safety when train braking.
In order to achieve the above-mentioned object of the invention, the present invention the following technical schemes are provided:
The present invention provides a kind of high-speed train braking friction block, including small steel back, friction piece and setting in small steel back and
Transition zone between friction piece；
The transition zone is by including that the component of following mass percentage is prepared:
Cu powder 80~90%；
Fe powder 5~15%；
Sn powder 5~8%.
Preferably, the transition zone with a thickness of 1~1.5mm.
Preferably, in the transition zone Cu powder partial size≤80 μm, partial size≤150 μm of Fe powder, partial size≤80 μ of Sn powder
m。
Preferably, the friction piece is by including that the component of following mass percentage is prepared:
Preferably, in the friction piece Cu powder partial size≤80 μm, partial size≤80 μm of Fe powder, partial size≤150 μ of Cr powder
M, SiO2Partial size≤10 μm, Al2O3Partial size≤10 μm, MoS2Partial size≤200 μm, partial size≤200 μm of graphite.
Preferably, the material of the small steel back is Q235-A steel.
The present invention provides the preparation methods of above-mentioned high-speed train braking friction block, comprising the following steps:
(1) the transition zone raw material is mixed, obtains transition zone mixture；The friction piece raw material is mixed, is rubbed
Rub body mixture；
(2) pressure sintering will be carried out after the small steel back, transition zone mixture and friction piece mixture compression moulding, obtained
High-speed train braking friction block.
Preferably, the pressure of compression moulding is 500~550MPa in the step (2), and the time of pressure maintaining is 5~10s.
Preferably, the pressure of pressure sintering is 1.5~2.5MPa in the step (2), and temperature is 850~900 DEG C, the time
For 2~3h.
Preferably, the protective atmosphere of pressure sintering is ammonolysis craft gas in the step (2).
The present invention provides a kind of high-speed train braking friction block, including small steel back, friction piece and setting in small steel back and
Transition zone between friction piece.The present invention improves bullet train system by adding transition zone between small steel back and friction piece
The shear strength of dynamic friction block bonds small steel back with friction piece stronger.Embodiment the result shows that, high speed provided by the invention
The shear strength of train braking friction block adhesive surface is up to 16.65MPa or more, the 7MPa required with the provisional technical conditions of EMU
Compared to improving 137%.
The present invention provides a kind of preparation method of high-speed train braking friction block, this method is simple and easy, it is easy to accomplish work
Industry metaplasia produces.
Detailed description of the invention
Fig. 1 is the structure chart of high-speed train braking friction block provided by the invention；
Wherein 1 is small steel back, and 2 be transition zone, and 3 be friction piece.
Specific embodiment
The present invention provides a kind of high-speed train braking friction block, structure chart is as shown in Figure 1；Including small steel back 1, friction piece
3 and the transition zone 2 that is arranged between small steel back and friction piece；
The transition zone is by including that the component of following mass percentage is prepared:
Cu powder 80~90%；
Fe powder 5~15%；
Sn powder 5~8%.
High-speed train braking friction block provided by the invention includes small steel back.In the present invention, the material of the small steel back
Preferably Q235-A steel；The present invention does not have special requirement to the shape of the small steel back, using known to those skilled in the art
Shape, high-speed train braking friction block can be made to be mounted in train braking device.
High-speed train braking friction block provided by the invention includes the transition zone being arranged between small steel back and friction piece.?
In the present invention, the thickness of the transition zone is preferably 1~1.5mm, more preferably 1.2~1.4mm.In terms of mass percentage,
The Cu powder for preparing raw material and including 80~90% of transition zone of the present invention, preferably 84~88%.In the present invention, the Cu
The partial size of powder preferably≤80 μm, more preferably 40~60 μm.In the present invention, the Cu in the transition zone is as matrix constituent element,
Determine the wear-resisting and heat resistance of material.
In terms of mass percentage, the Fe powder for preparing raw material and including 5~15% of transition zone of the present invention, preferably 8
~12%.In the present invention, the Fe powder partial size preferably≤150 μm, more preferably 80~120 μm.In the present invention, described
Fe in transition zone is dissolved into Cu matrix, is formed solid solution, is played invigoration effect to matrix, can be improved the intensity of material with
Hardness.
In terms of mass percentage, the Sn powder for preparing raw material and including 5~8% of transition zone of the present invention, preferably 6~
7%.In the present invention, the Sn powder partial size preferably≤80 μm, more preferably 40~60 μm.In the present invention, the transition
Sn in layer is dissolved into Cu matrix, is formed solid solution, is played invigoration effect to matrix, can be improved the intensity of material and hard
Degree.
In the present invention, in friction piece friction component presence, the adhesive strength between friction piece and small steel back can be reduced, and
The addition of transition zone makes that metallurgical bonding has occurred between transition zone and steel back and friction piece during the sintering process, and high speed can be improved
The shear strength of train braking friction block bonds small steel back with friction piece stronger.
High-speed train braking friction block provided by the invention includes friction piece.The present invention does not have the thickness of the friction piece
Special requirement uses friction body thickness well known in the art.In the present invention, the friction piece is preferably by including following
The component of mass percentage is prepared:
In terms of mass percentage, the Cu powder for preparing raw material and including 50~60% of friction piece of the present invention, preferably
52~58%.In the present invention, the Cu powder partial size preferably≤80 μm, more preferably 40~60 μm.In the present invention, described
Cu in friction piece is matrix, determines the wear-resisting and heat resistance of material.
In terms of mass percentage, the Fe powder for preparing raw material and including 15~25% of friction piece of the present invention, preferably
18~22%.In the present invention, the Fe powder partial size preferably≤150 μm, more preferably 80~120 μm.In the present invention, institute
It states the Fe in friction piece to be dissolved into Cu matrix, forms solid solution, invigoration effect is played to matrix, can be improved the intensity of material
With hardness.
In terms of mass percentage, the Cr powder for preparing raw material and including 2~8% of friction piece of the present invention, preferably 4~
6%.In the present invention, the Cr powder partial size preferably≤150 μm, more preferably 80~120 μm.In the present invention, described to rub
Cr in rub body is evenly distributed in matrix as friction component, can be improved the coefficient of friction of material.
In terms of mass percentage, the SiO for preparing raw material and including 1~2% of friction piece of the present invention2, preferably
1.5%.In the present invention, the SiO2Partial size preferably≤10 μm, more preferably 6~8 μm.In the present invention, the friction
SiO in body2It is evenly distributed in matrix as friction component, can be improved the coefficient of friction of material.
In terms of mass percentage, the Al for preparing raw material and including 0.5~1% of friction piece of the present invention2O3, preferably
0.75%.In the present invention, the Al2O3Partial size preferably≤10 μm, more preferably 6~8 μm.In the present invention, the friction
Al in body2O3It is evenly distributed in matrix as friction component, can be improved the coefficient of friction of material.
In terms of mass percentage, the MoS for preparing raw material and including 1~2% of friction piece of the present invention2, preferably
1.5%.In the present invention, the MoS2Partial size preferably≤200 μm, more preferably 150~180 μm.In the present invention, described
MoS in friction piece2As lubricant component, due in this material structure, between layers in conjunction with weaker and in layer between atom
In conjunction with relatively by force, plays the role of solid lubrication, can be improved the friction stability and wearability of material.
In terms of mass percentage, the graphite for preparing raw material and including 8~15% of friction piece of the present invention, preferably 10
~12%.In the present invention, the graphite partial size preferably≤200 μm, more preferably 150~180 μm.In the present invention, institute
The graphite stated in friction piece can be used as lubricant component, due in this material structure, between layers in conjunction with weaker and in layer
It is combined relatively by force between atom, plays the role of solid lubrication, improve the friction stability and wearability of material.
The present invention is controlled by component to friction piece and content, can further increase small steel back and friction piece
Adhesion strength.
The present invention provides the preparation methods of above-mentioned high-speed train braking friction block, comprising the following steps:
(1) the transition zone raw material is mixed, obtains transition zone mixture；The friction piece raw material is mixed, is rubbed
Rub body mixture；
(2) pressure sintering will be carried out after the small steel back, transition zone mixture and friction piece mixture compression moulding, obtained
High-speed train braking friction block.
The present invention mixes the transition zone raw material, obtains transition zone mixture.In the present invention, the transition zone raw material
Incorporation time be preferably 4~5h, more preferably 5h.
The present invention mixes the friction piece raw material, obtains friction piece mixture.In the present invention, the friction piece raw material
Incorporation time be preferably 7~8h, more preferably 8h.
Present invention preferably uses V-type batch mixers to mix the transition zone raw material, friction piece raw material respectively；The present invention
Drying and processing, temperature of the present invention to the drying are preferably carried out respectively to the transition zone raw material, friction piece raw material before mixing
Degree and time do not have special requirement, can completely remove the moisture in raw material.
After obtaining transition zone mixture and friction piece mixture, the present invention is by the small steel back, transition zone mixture and rubs
Pressure sintering is carried out after rub body mixture compression moulding, obtains high-speed train braking friction block.In the present invention, described to be pressed into
The pressure of type is preferably 500~550MPa, more preferably 520~540MPa；The time of the compression moulding is preferably 5~10s,
More preferably 6~8s；Present invention preferably uses hydraulic presses to carry out the small steel back, transition zone mixture and friction piece mixture
Compression moulding, the present invention suppress while realizing multiple layer powder by controlling the charging system of hydraulic press.
In the present invention, the pressure of the pressure sintering is preferably 1.5~2.5MPa, more preferably 2.0MPa；It is described to add
The temperature of pressure sintering is preferably 850~900 DEG C, and more preferably 860~880 DEG C；The time of the pressure sintering is preferably 2~
3h, more preferably 2.5h；The present invention preferably carries out pressure sintering, the protection of the pressure sintering in bell-jar pressurized sintering furnace
Atmosphere is ammonolysis craft gas, and the ammonolysis craft gas is hydrogen and nitrogen mixed gas, nitrogen and hydrogen in the ammonolysis craft gas
The volume ratio of gas is preferably 1:3.The present invention makes tentatively to have between transition zone and small steel back and friction piece certain by compression moulding
Adhesion strength, the adhesion strength after pressure sintering between transition zone and small steel back and friction piece is further enhanced.
After pressure sintering, the present invention makes agglomerate cooled to room temperature preferably to get bullet train system of the invention is arrived
Dynamic friction block.
High-speed train braking friction block provided by the invention and preparation method thereof is carried out below with reference to embodiment detailed
Illustrate, but they cannot be interpreted as limiting the scope of the present invention.
Embodiment 1
By mass content be 50% Cu powder (partial size is 75 μm), 25% Fe powder (partial size is 75 μm), 5% Cr powder
(partial size be 80 μm), 2% SiO2(partial size be 5 μm), 1% Al2O3(partial size be 5 μm), 2% MoS2(partial size is 180 μ
M), 15% graphite (partial size is 180 μm) mixes 8h in V-type batch mixer and obtains friction piece mixture；It is by mass content
90% Cu powder (partial size is 80 μm), 5% Fe powder (partial size is 150 μm), 5% Sn powder (partial size is 80 μm) are in V-type mixing
5h is mixed in machine obtains transition zone mixture；Small steel back, transition zone mixture and friction piece that material is Q235-A steel grade are mixed
It closes material and is put into compression moulding in hydraulic press, the pressure of compression moulding is 500MPa, dwell time 5s；Then pressurize in bell-jar
Pressure sintering in sintering furnace, wherein protective atmosphere is ammonolysis craft gas, and sintering temperature is 850 DEG C, pressure 1.5MPa, soaking time
2h, natural cooling obtain high-speed train braking friction block；Wherein, transition zone with a thickness of 1mm.
It is tested using shear strength of the universal testing machine to gained high-speed train braking friction block adhesive surface, it will
Acquired results are listed in Table 1 below.
Comparative example 1
The transition zone in embodiment 1 is omitted, directly by the friction piece mixture and small steel back (Q235-A in embodiment 1
Steel grade) it is put into compression moulding and pressure sintering in hydraulic press, compression moulding condition is consistent with embodiment 1 with pressure sintering condition.
The shear strength of high-speed train braking friction block adhesive surface using universal testing machine to gained without transition zone
It is tested, acquired results is listed in Table 1 below.
Embodiment 2
By mass content be 60% Cu powder (partial size is 60 μm), 21.5% Fe powder (partial size is 120 μm), 2% Cr
Powder (partial size be 120 μm), 1% SiO2(partial size be 10 μm), 0.5% Al2O3(partial size be 10 μm), 1% MoS2(partial size
Be 200 μm), 14% graphite (partial size is 200 μm) mixing 7h obtain friction piece mixture；The Cu powder for being 80% by mass content
(partial size is 60 μm), 12% Fe powder (partial size is 120 μm), 8% Sn powder (partial size is 60 μm) mixing 4h obtain transition zone and mix
Close material；Small steel back, transition zone mixture and friction piece mixture that material is Q235-A steel grade are put into hydraulic press and are pressed into
Type, the pressure of compression moulding are 550MPa, time 8s；The then pressure sintering in bell-jar pressurized sintering furnace, wherein protecting
Atmosphere is ammonolysis craft gas, and sintering temperature is 900 DEG C, pressure 2.5MPa, soaking time 3h, and natural cooling obtains bullet train
Braking brake pad；Wherein, transition zone with a thickness of 1.5mm.
It is tested using shear strength of the universal testing machine to gained high-speed train braking friction block adhesive surface, it will
Acquired results are listed in Table 1 below.
Comparative example 2
The transition zone in embodiment 2 is omitted, directly by the friction piece mixture and small steel back (Q235-A steel in embodiment 2
Kind) it is put into compression moulding and pressure sintering in hydraulic press, compression moulding condition is consistent with embodiment 2 with pressure sintering condition.
The shear strength of high-speed train braking friction block adhesive surface using universal testing machine to gained without transition zone
It is tested, acquired results is listed in Table 1 below.
Embodiment 3
By mass content be 55% Cu powder (partial size is 50 μm), 25% Fe powder (partial size is 50 μm), 8% Cr powder
(partial size be 150 μm), 1.5% SiO2(partial size be 8 μm), 0.75% Al2O3(partial size be 8 μm), 1.5% MoS2(partial size
Be 150 μm), 8.25% graphite (partial size is 150 μm) mixing 8h obtain friction piece mixture；The Cu for being 85% by mass content
Powder (partial size is 50 μm), 8% Fe powder (partial size is 100 μm), 7% Sn powder (partial size is 50 μm) mixing 5h obtain transition zone and mix
Close material；Small steel back, transition zone mixture and friction piece mixture that material is Q235-A steel grade are put into hydraulic press and are pressed into
Type, the pressure of compression moulding are 520MPa, dwell time 10s；The then pressure sintering in bell-jar pressurized sintering furnace, wherein
Protective atmosphere is ammonolysis craft gas, and sintering temperature is 860 DEG C, pressure 2MPa, soaking time 2.5h, and natural cooling obtains high speed
Train braking friction block；Wherein, transition zone with a thickness of 1.2mm.
It is tested using shear strength of the universal testing machine to gained high-speed train braking friction block adhesive surface, it will
Acquired results are listed in Table 1 below.
Comparative example 3
The transition zone in embodiment 3 is omitted, directly by the friction piece mixture and small steel back (Q235-A steel in embodiment 3
Kind) it is put into compression moulding and pressure sintering in hydraulic press, compression moulding condition is consistent with embodiment 3 with pressure sintering condition.
The shear strength of high-speed train braking friction block adhesive surface using universal testing machine to gained without transition zone
It is tested, acquired results is listed in Table 1 below.
Embodiment 4
By mass content be 60% Cu powder (partial size is 40 μm), 15% Fe powder (partial size is 80 μm), 7% Cr powder
(partial size be 100 μm), 2% SiO2(partial size be 6 μm), 1% Al2O3(partial size be 6 μm), 2% MoS2(partial size is 160 μ
M), 13% graphite (partial size is 160 μm) mixing 7h obtains friction piece mixture；Cu powder (the partial size for being 83% by mass content
Be 40 μm), 10% Fe powder (partial size is 80 μm), 7% Sn powder (partial size is 40 μm) mixing 4h obtain transition zone mixture, and
Small steel back, transition zone mixture and friction piece mixture that material is Q235-A steel grade are put into compression moulding in hydraulic press, pressed
Making molding pressure is 540MPa, time 6s；The then pressure sintering in bell-jar pressurized sintering furnace, wherein protective atmosphere be
Ammonolysis craft gas, sintering temperature are 880 DEG C, pressure 2.2MPa, soaking time 2.8h, and natural cooling obtains high-speed train braking
Friction block；Wherein, transition zone with a thickness of 1.4mm.
It is tested using shear strength of the universal testing machine to gained high-speed train braking friction block adhesive surface, it will
Acquired results are listed in Table 1 below.
Comparative example 4
The transition zone in embodiment 4 is omitted, directly by the friction piece mixture and small steel back (Q235-A steel in embodiment 4
Kind) it is put into compression moulding and pressure sintering in hydraulic press, compression moulding condition is consistent with embodiment 4 with pressure sintering condition.
The shear strength of high-speed train braking friction block adhesive surface using universal testing machine to gained without transition zone
It is tested, acquired results is listed in Table 1 below.
The shear strength table of comparisons of 1~4 gained friction block of 1 Examples 1 to 4 of table and comparative example
| Project | Shear strength/MPa | Project | Shear strength/MPa |
| Embodiment 1 | 16.65 | Comparative example 1 | 7.58 |
| Embodiment 2 | 17.53 | Comparative example 2 | 8.23 |
| Embodiment 3 | 18.09 | Comparative example 3 | 7.83 |
| Embodiment 4 | 17.61 | Comparative example 4 | 8.12 |
As shown in Table 1, the present invention can increase substantially high speed by adding transition zone between small steel back and friction piece
The shear strength of train braking friction block, the shear strength of gained high-speed train braking friction block up to 16.65MPa or more, with
The 7MPa that the provisional technical conditions of EMU require, which is compared, improves 137%.
The above is only a preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications are also answered
It is considered as protection scope of the present invention.
Claims (10)
1. a kind of high-speed train braking friction block, which is characterized in that including small steel back, friction piece and setting in small steel back and friction
Transition zone between body；
The transition zone is by including that the component of following mass percentage is prepared:
Cu powder 80~90%；
Fe powder 5~15%；
Sn powder 5~8%.
2. high-speed train braking friction block according to claim 1, which is characterized in that the transition zone with a thickness of 1~
1.5mm。
3. high-speed train braking friction block according to claim 1, which is characterized in that the partial size of Cu powder in the transition zone
≤ 80 μm, partial size≤150 μm of Fe powder, partial size≤80 μm of Sn powder.
4. high-speed train braking friction block according to claim 1, which is characterized in that the friction piece is by including following matter
The component of amount percentage composition is prepared:
5. high-speed train braking friction block according to claim 4, which is characterized in that the partial size of Cu powder in the friction piece
≤ 80 μm, partial size≤80 μm of Fe powder, partial size≤150 μm of Cr powder, SiO2Partial size≤10 μm, Al2O3Partial size≤10 μm,
MoS2Partial size≤200 μm, partial size≤200 μm of graphite.
6. high-speed train braking friction block according to claim 1, which is characterized in that the material of the small steel back is
Q235-A steel.
7. the preparation method of high-speed train braking friction block described in claim 1~6 any one, comprising the following steps:
(1) the transition zone raw material is mixed, obtains transition zone mixture；The friction piece raw material is mixed, friction piece is obtained
Mixture；
(2) pressure sintering will be carried out after the small steel back, transition zone mixture and friction piece mixture compression moulding, obtains high speed
Train braking friction block.
8. preparation method according to claim 7, which is characterized in that the pressure of compression moulding is 500 in the step (2)
~550MPa, the time of pressure maintaining are 5~10s.
9. preparation method according to claim 7, which is characterized in that the pressure of pressure sintering is 1.5 in the step (2)
~2.5MPa, temperature are 850~900 DEG C, and the time is 2~3h.
10. preparation method according to claim 7, which is characterized in that the protective atmosphere of pressure sintering in the step (2)
For ammonolysis craft gas.
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| CN112682447A (en) * | 2020-12-31 | 2021-04-20 | 博深股份有限公司 | High-speed rail brake pad friction block applying composite material transition layer and preparation method thereof |
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