CN109854650A - A kind of bullet train brake lining friction element and preparation method thereof - Google Patents
A kind of bullet train brake lining friction element and preparation method thereof Download PDFInfo
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- CN109854650A CN109854650A CN201910237371.4A CN201910237371A CN109854650A CN 109854650 A CN109854650 A CN 109854650A CN 201910237371 A CN201910237371 A CN 201910237371A CN 109854650 A CN109854650 A CN 109854650A
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- backboard
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Abstract
The invention discloses a kind of bullet train brake lining friction elements and preparation method thereof.The friction element includes the powder metallurgy backboard being successively sintered into one, melts infiltration layer and friction piece；Melt after infiltration layer dissolves each other with powder metallurgy backboard and the friction piece respectively together with metallurgical bonding；Powder metallurgy backboard is formed by I compacting sintering of metal powder；Melt infiltration layer to be suppressed by metal powder II；Friction piece is suppressed by metal powder III.Friction element provided by the invention, the infiltration layer therein that melts form solid solution alloy with powder metallurgy backboard and friction piece respectively completely, and play the role of melting the plating of powder metallurgy backboard be bonded between infiltration anti-corrosion and backboard and friction piece.The powder metallurgy backboard is formed by iron-based material compacting sintering；Melt infiltration layer described in sintering the powder metallurgy backboard and friction piece bond together, and powder metallurgy backboard is carried out to melt plating Copper treatment, realizes antisepsis.
Description
Technical field
The present invention relates to a kind of bullet train brake lining friction elements and preparation method thereof, are related to bullet train brake pad
Technical field.
Background technique
Rail traffic is the technical field of state key development, and high-speed rail motor-car is the main artery of national economy and popular
The vehicles.As Chinese technology of track traffic reaches its maturity, the high-speed rail and motor-car quantity applied in the market are also bigger more carrying out v.
To guarantee bullet train safe operation, stable and good braking system is essential.Brake pad is bullet train system
The critical component and attrition component of dynamic system, with the continuous improvement of the bullet train speed of service, the braking energy of train is also substantially
Increase, it requires that brake lining has higher physical property, more stable frictional behaviour.
It is 250 kilometers of speed per hour or more high at present due to having many advantages, such as intensity height, stable friction performance, non-environmental-pollution
Brake pad used in fast train is generally powdered metallurgical material.Friction element is critical component, friction in powder metallurgy brake pad
The quality of performance directly influences the brake safe and service life of brake lining, and friction element is mainly by backboard, transition zone, friction piece
Three parts form, and under the conditions of the prior art, in the practical braking of bullet train, often occur due to high temperature lower backboard adhesive strength
It is low to cause to fall off, security risk is brought to train braking.
Summary of the invention
The object of the present invention is to provide a kind of bullet train brake lining friction element and preparation method thereof, the friction elements
Can overcome existing friction element dorsulum is low with friction piece adhesive strength both to cause to separate caducous disadvantage, improve by
The service life of powder metallurgy brake pad made of the friction element, while the copper-plating technique of supporting back board is also eliminated, so that
Entire manufacturing process is more environmentally-friendly.
Bullet train brake lining friction element provided by the present invention, including the powder metallurgy back being successively sintered into one
Plate melts infiltration layer and friction piece；
It is described to melt after infiltration layer dissolves each other with the powder metallurgy backboard and the friction piece respectively together with metallurgical bonding, it plays
Bond the effect of the powder metallurgy backboard and the friction piece；
The powder metallurgy backboard is formed by I compacting sintering of metal powder；
The infiltration layer that melts is suppressed by metal powder II；
The friction piece is suppressed by metal powder III.
In above-mentioned friction element, the powder metallurgy backboard with a thickness of 2.5~3.5mm；
The mass percentage composition of the metal powder I is as follows:
Iron powder 90%~95%；
Copper powder 1%~5%；
Nickel powder 1%~5%；
Graphite powder 0.1%~2%；
Concretely:
Iron powder 95%；
Copper powder 1%；
Nickel powder 3.5%；
Graphite powder 0.5%.
In above-mentioned friction element, the sintering temperature of the metal powder I is 1100~1150 DEG C, the time is 15~
45min。
In above-mentioned friction element, it is described melt infiltration layer with a thickness of 0.5~2mm；
The mass percentage composition of the metal powder II is as follows:
Copper-tin alloy 90%~95%；
Iron-copper 1%~8%；
Nickel 1%~4%；
Concretely:
Copper-tin alloy 90%；
Iron-copper 6%；
Nickel 4%.
In above-mentioned friction element, the mass percentage composition of the metal powder III is as follows are as follows:
Cu 30%~55%；
Fe 15%~40%；
MoS21%~4%；
Tungsten carbide 1%~2%；
Graphite 10%~20%；
Ferrochrome 5%~10%；
Aluminium oxide 1%~2%；
Concretely:
Cu 53%；
Fe 15%；
MoS23%；
Tungsten carbide 2%；
Graphite 18%；
Ferrochrome 8%；
Aluminium oxide 1%.
The present invention still further provides the preparation method of the friction element, includes the following steps:
1) it is suppressed to obtain molding green compact A after mixing the metal powder I, the molding green compact A is continuously burnt
Knot obtains the powder metallurgy backboard；
2) it is pressed to obtain tabletting after mixing the metal powder II；
3) it is pressed to obtain molding green compact B after mixing the metal powder III；
4) the powder metallurgy backboard, the tabletting and the molding green compact are successively bonded integrally, in reducing atmosphere
Lower carry out high temperature sintering, it is then successively pressurized, cooling after to get arriving the friction element.
In above-mentioned preparation method, in step 1), the mixed time is 0.5~2 hour；
The temperature of the sintering is 1100~1150 DEG C, and the time is 15~45min；
It is sintered in powder metallurgy meshbeltfurnace.
In above-mentioned preparation method, in step 2), the mixed time is 0.5~2 hour, then puts mixed material
Enter the tablet press machine die cavity of constant volume weighing, punching press obtains the tabletting of required weight and thickness.
In above-mentioned preparation method, in step 3), the mixed time is 1~10 hour, then puts mixed material
Enter the automatic forming press die cavity of constant volume weighing, by adjusting molding equipment pressure, obtains the molding green compact of required density.
In above-mentioned preparation method, in step 4), it is sintered in push boat type atmosphere sintering furnace；
The temperature of the high temperature sintering is 1000~1100 DEG C, and the time is 30~120min；
The reducing atmosphere is H2With N2Mixed gas.
In above-mentioned preparation method, the condition of the pressurization is as follows:
Pressure is 0.01~5MPa；
Time is 5~30min.
Friction element provided by the invention, the infiltration layer therein that melts are formed admittedly with powder metallurgy backboard and friction piece completely respectively
Fused gold, and play the role of melting the plating of powder metallurgy backboard be bonded between infiltration anti-corrosion and backboard and friction piece.The powder smelting
Golden backboard is formed by iron-based material compacting sintering；Melt infiltration layer for the powder metallurgy backboard and friction piece by described in sintering
It bonds together, and powder metallurgy backboard is carried out to melt plating Copper treatment, realize antisepsis.Friction element of the present invention can gram
It takes that existing friction block dorsulum is low with friction piece adhesive strength both to be caused to separate caducous disadvantage, and reduces backboard copper facing
Deng pollution process.Adhesive strength > through overtesting, in friction element of the present invention between powder metallurgy backboard and friction piece
40MPa, much higher than the requirement of > 7MPa required in professional standard TJ/L307.
Specific embodiment
Experimental method used in following embodiments is conventional method unless otherwise specified.
The materials, reagents and the like used in the following examples is commercially available unless otherwise specified.
Embodiment 1,
The mass percentage composition of the metal powder for the compacting sintering powder metallurgy backboard that the present embodiment uses is as follows:
Iron powder 95%；Copper powder 1%；Nickel powder 3.5%；Graphite powder 0.5%.
The mass percentage composition for the metal powder that infiltration layer is melted in the compacting that the present embodiment uses is as follows:
Copper-tin alloy 90%；Iron-copper 6%；Nickel 4%.
The mass percentage composition of the metal powder for the compacting friction piece that the present embodiment uses is as follows:
Cu 53%；Fe 15%；MoS23%；Tungsten carbide 2%；Graphite 18%；Ferrochrome 8%；Aluminium oxide 1%.
Bullet train brake lining friction element is prepared as steps described below:
Friction piece powder is carried out three-dimensional blender by step 1 according to the proportion, and mixing time is 8 hours, and mixed material is put into
The automatic forming press die cavity of constant volume weighing obtains required density (4.8g/cm by adjusting molding equipment pressure3) molding
Green compact, as friction piece.
Step 2 will melt infiltration layer powder and carry out three-dimensional blender according to the proportion, and mixing time is 2 hours, and mixed material is put into
The tablet press machine die cavity of constant volume weighing, punching press show that (thickness is about the 5% of friction piece, and weight is friction piece for required weight and thickness
6%) tabletting.
Powder metallurgy backboard powder is carried out three-dimensional blender by step 3 according to the proportion, and mixing time is 2 hours, will be mixed
Material is put into the molding machine compacting die cavity of constant volume weighing, obtains required molding green compact, green compact are then put into powder metallurgy mesh belt
Furnace carries out continuous sintering, carries out high temperature sintering, and sintering temperature is 1120 DEG C, high-temperature region time 30min, show that powder metallurgy is carried on the back
Plate.
Step 4, by friction piece, melt infiltration layer and powder metallurgy backboard is successively grouped together, be put into push boat type atmosphere sintering
Furnace passes through high temperature sintering: sintering temperature is 1020 DEG C, and the high temperature section time is 120min, and reducing atmosphere is that volume ratio is 3:1's
H2And N2.Pressurization: it is single to obtain the friction of bullet train brake lining with furnace water cooling by pressing time 15min, on-load pressure 0.5MPa
Member, wherein powder metallurgy backboard with a thickness of 3mm, melt infiltration layer with a thickness of 0.5mm.
Using the detection mode of TJ/L307 attachment defined adhesive strength, measure between powder metallurgy backboard and friction piece
Adhesive strength be 30MPa, much higher than the requirement of > 7MPa required in professional standard TJ/L307.
Friction piece prepared by the present embodiment measures density in 5.0~5.3g/ according to TJ/L307 defined test method
Cm3 or so, friction material shear strength 15MPa or so.It is tested through TM-II type frictional testing machine, measured coefficient of friction
Stablize 0.35 or so, is all satisfied the requirement of professional standard.
Claims (10)
1. a kind of friction element, including be successively sintered into one powder metallurgy backboard, melt infiltration layer and friction piece；
It is described to melt after infiltration layer dissolves each other with the powder metallurgy backboard and the friction piece respectively together with metallurgical bonding；
The powder metallurgy backboard is formed by I compacting sintering of metal powder；
The infiltration layer that melts is suppressed by metal powder II；
The friction piece is suppressed by metal powder III.
2. friction element according to claim 1, it is characterised in that: the powder metallurgy backboard with a thickness of 2.5~
3.5mm；
The mass percentage composition of the metal powder I is as follows:
Iron powder 90%~95%；
Copper powder 1%~5%；
Nickel powder 1%~5%；
Graphite powder 0.1%~2%.
3. friction element according to claim 1 or 2, it is characterised in that: the sintering temperature of the metal powder I is 1100
~1150 DEG C, the time is 15~45min.
4. friction element according to any one of claim 1-3, it is characterised in that: it is described melt infiltration layer with a thickness of 0.5
~2mm；
The mass percentage composition of the metal powder II is as follows:
Copper-tin alloy 90%~95%；
Iron-copper 1%~8%；
Nickel 1%~4%.
5. friction element described in any one of -4 according to claim 1, it is characterised in that: the quality hundred of the metal powder III
Divide as follows than forming are as follows:
Cu 30%~55%；
Fe 15%~40%；
MoS21%~4%；
Tungsten carbide 1%~2%；
Graphite 10%~20%；
Ferrochrome 5%~10%；
Aluminium oxide 1%~2%.
6. friction element described in any one of -4 according to claim 1, it is characterised in that: the friction element is wanted according to right
Any one of 7-10 the method is asked to be prepared.
7. the preparation method of friction element described in any one of claim 1-6, includes the following steps:
1) it is suppressed to obtain molding green compact A after mixing the metal powder I, the molding green compact A carries out continuous sintering and obtains
To the powder metallurgy backboard；
2) it is pressed to obtain tabletting after mixing the metal powder II；
3) it is pressed to obtain molding green compact B after mixing the metal powder III；
4) the powder metallurgy backboard, the tabletting and the molding green compact are successively bonded integrally, under reducing atmosphere into
Row high temperature sintering, it is then successively pressurized, cooling after to get arriving the friction element.
8. preparation method according to claim 7, it is characterised in that: in step 1), the temperature of the sintering is 1100~
1150 DEG C, the time is 15~45min；
It is sintered in powder metallurgy meshbeltfurnace.
9. preparation method according to claim 7 or 8, it is characterised in that: in step 4), in push boat type atmosphere sintering furnace
Carry out high temperature sintering；
The temperature of the high temperature sintering is 1000~1100 DEG C, and the time is 30~120min；
The reducing atmosphere is H2With N2Mixed gas.
10. the preparation method according to any one of claim 7-9, it is characterised in that: the condition of the pressurization is as follows:
Pressure is 0.01~5MPa；
Time is 5~30min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237371.4A CN109854650B (en) | 2019-03-27 | 2019-03-27 | Friction unit for high-speed train brake pad and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910237371.4A CN109854650B (en) | 2019-03-27 | 2019-03-27 | Friction unit for high-speed train brake pad and preparation method thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109854650A true CN109854650A (en) | 2019-06-07 |
| CN109854650B CN109854650B (en) | 2020-11-13 |
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| CN110695364A (en) * | 2019-11-15 | 2020-01-17 | 博深股份有限公司 | Motor train unit brake pad material and method for manufacturing same |
| CN111826576A (en) * | 2020-07-26 | 2020-10-27 | 重庆科利得精密机械工业有限公司 | Metal powder and method for processing high-performance metal parts by using metal powder |
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