CN112682447A - High-speed rail brake pad friction block applying composite material transition layer and preparation method thereof - Google Patents
High-speed rail brake pad friction block applying composite material transition layer and preparation method thereof Download PDFInfo
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- CN112682447A CN112682447A CN202011635124.9A CN202011635124A CN112682447A CN 112682447 A CN112682447 A CN 112682447A CN 202011635124 A CN202011635124 A CN 202011635124A CN 112682447 A CN112682447 A CN 112682447A
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- 239000002131 composite material Substances 0.000 title claims abstract description 139
- 230000007704 transition Effects 0.000 title claims abstract description 139
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- 239000002783 friction material Substances 0.000 claims abstract description 76
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 61
- 239000010959 steel Substances 0.000 claims abstract description 61
- 239000002994 raw material Substances 0.000 claims abstract description 52
- 239000000843 powder Substances 0.000 claims abstract description 24
- 229910052755 nonmetal Inorganic materials 0.000 claims abstract description 17
- 229910052751 metal Inorganic materials 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 8
- 239000002184 metal Substances 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims description 86
- 238000005245 sintering Methods 0.000 claims description 65
- 238000003825 pressing Methods 0.000 claims description 35
- 238000005303 weighing Methods 0.000 claims description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 19
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims description 16
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 16
- 229910052739 hydrogen Inorganic materials 0.000 claims description 16
- 239000001257 hydrogen Substances 0.000 claims description 16
- 238000002156 mixing Methods 0.000 claims description 16
- 239000000203 mixture Substances 0.000 claims description 16
- 238000000465 moulding Methods 0.000 claims description 16
- 238000004321 preservation Methods 0.000 claims description 16
- 238000003756 stirring Methods 0.000 claims description 16
- 239000000126 substance Substances 0.000 claims description 15
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 12
- UQSXHKLRYXJYBZ-UHFFFAOYSA-N Iron oxide Chemical compound [Fe]=O UQSXHKLRYXJYBZ-UHFFFAOYSA-N 0.000 claims description 10
- OSGAYBCDTDRGGQ-UHFFFAOYSA-L calcium sulfate Chemical compound [Ca+2].[O-]S([O-])(=O)=O OSGAYBCDTDRGGQ-UHFFFAOYSA-L 0.000 claims description 10
- PMHQVHHXPFUNSP-UHFFFAOYSA-M copper(1+);methylsulfanylmethane;bromide Chemical compound Br[Cu].CSC PMHQVHHXPFUNSP-UHFFFAOYSA-M 0.000 claims description 9
- 229910010271 silicon carbide Inorganic materials 0.000 claims description 7
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims description 7
- 229910052580 B4C Inorganic materials 0.000 claims description 6
- INAHAJYZKVIDIZ-UHFFFAOYSA-N boron carbide Chemical compound B12B3B4C32B41 INAHAJYZKVIDIZ-UHFFFAOYSA-N 0.000 claims description 6
- 150000004767 nitrides Chemical class 0.000 claims description 6
- 150000003839 salts Chemical class 0.000 claims description 6
- 239000000377 silicon dioxide Substances 0.000 claims description 6
- 235000012239 silicon dioxide Nutrition 0.000 claims description 6
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 5
- NRTOMJZYCJJWKI-UHFFFAOYSA-N Titanium nitride Chemical compound [Ti]#N NRTOMJZYCJJWKI-UHFFFAOYSA-N 0.000 claims description 5
- OGIDPMRJRNCKJF-UHFFFAOYSA-N titanium oxide Inorganic materials [Ti]=O OGIDPMRJRNCKJF-UHFFFAOYSA-N 0.000 claims description 5
- NJLLQSBAHIKGKF-UHFFFAOYSA-N dipotassium dioxido(oxo)titanium Chemical compound [K+].[K+].[O-][Ti]([O-])=O NJLLQSBAHIKGKF-UHFFFAOYSA-N 0.000 claims description 4
- INZDTEICWPZYJM-UHFFFAOYSA-N 1-(chloromethyl)-4-[4-(chloromethyl)phenyl]benzene Chemical compound C1=CC(CCl)=CC=C1C1=CC=C(CCl)C=C1 INZDTEICWPZYJM-UHFFFAOYSA-N 0.000 claims description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 3
- 229910026551 ZrC Inorganic materials 0.000 claims description 3
- OTCHGXYCWNXDOA-UHFFFAOYSA-N [C].[Zr] Chemical compound [C].[Zr] OTCHGXYCWNXDOA-UHFFFAOYSA-N 0.000 claims description 3
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical compound [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 3
- SKKMWRVAJNPLFY-UHFFFAOYSA-N azanylidynevanadium Chemical compound [V]#N SKKMWRVAJNPLFY-UHFFFAOYSA-N 0.000 claims description 3
- GVEHJMMRQRRJPM-UHFFFAOYSA-N chromium(2+);methanidylidynechromium Chemical compound [Cr+2].[Cr]#[C-].[Cr]#[C-] GVEHJMMRQRRJPM-UHFFFAOYSA-N 0.000 claims description 3
- SZVJSHCCFOBDDC-UHFFFAOYSA-N ferrosoferric oxide Chemical compound O=[Fe]O[Fe]O[Fe]=O SZVJSHCCFOBDDC-UHFFFAOYSA-N 0.000 claims description 3
- 229910002804 graphite Inorganic materials 0.000 claims description 3
- 239000010439 graphite Substances 0.000 claims description 3
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 3
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 3
- 229910003470 tongbaite Inorganic materials 0.000 claims description 3
- 229910001928 zirconium oxide Inorganic materials 0.000 claims description 3
- 238000000926 separation method Methods 0.000 abstract description 2
- 241000357293 Leptobrama muelleri Species 0.000 description 5
- 238000004663 powder metallurgy Methods 0.000 description 4
- 229910052802 copper Inorganic materials 0.000 description 3
- 239000010949 copper Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 1
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- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000001050 lubricating effect Effects 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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Abstract
The invention relates to a high-speed rail brake pad friction block applying a composite material transition layer and a preparation method thereof, and the high-speed rail brake pad friction block comprises a steel backing, the composite material transition layer and a friction material which are sequentially connected, wherein the composite material transition layer and the friction material adopt the same metal elements and proportion, the composite material transition layer is composed of the following raw materials, 70-100 parts by weight of metal powder and 1-30 parts by weight of non-metal powder, and the non-metal powder comprises inorganic non-metal powder. The composite material transition layer is connected with the friction material and the steel backing, so that the friction material and the steel backing can be firmly combined, a small amount of inorganic non-metal powder is added, the thermal expansion of the composite material transition layer is equivalent to that of the friction material, the influence of cracks generated by different thermal expansion of the composite material transition layer and the friction material is reduced, and the risk of separation of the friction material and the steel backing in the braking process is also reduced.
Description
Technical Field
The invention relates to a high-speed rail brake pad friction block applying a composite material transition layer and a preparation method thereof, belonging to the field of powder metallurgy materials.
Background
In recent years, the development of high-speed railways in China is rapid, and the achievement of drawing attention is achieved. From 2008 to 2017, the operating mileage of the high-speed railway in China is over 2.6 ten thousand kilometers in less than 10 years, and the operating mileage is expected to reach 3 ten thousand kilometers in 2020. In order to meet the development requirements of faster and safer high-speed trains, the high-speed train brake material has the characteristics of stable friction coefficient, excellent wear resistance and the like, and the high-speed trains at 300km/h and above all adopt powder metallurgy brake pads.
The powder metallurgy braking material is a composite material which is composed of a base component, a friction component and a lubricating component and is prepared by a powder metallurgy method. The copper-based brake material has the characteristics of stable friction factor, excellent wear resistance and heat resistance, good environmental adaptability, small damage to a brake disc and the like, and is widely applied to domestic and foreign high-speed trains.
The friction material of the brake pad of the existing high-speed train is directly sintered on a steel back, the friction material is mainly based on copper at present, and the steel back can be tightly connected after being subjected to copper plating treatment. However, with the development of high-speed trains, the speed of the trains is gradually increased, the load on the brake pad is increased, the temperature generated during braking is continuously increased, and in order to meet the requirements of stable friction coefficient and high strength at high speed, a large amount of non-metallic elements are added into the brake pad, so that the binding force between the friction material and the steel backing is reduced, the friction material is easily separated from the steel backing in the braking process, and great potential safety hazards are caused.
Disclosure of Invention
In order to solve the technical problems, the invention provides a high-speed rail brake pad friction block applying a composite material transition layer and a preparation method thereof, which can reduce the influence of cracks generated by the transition layer and the friction material due to different thermal expansion properties and can be tightly connected with the friction material and a steel backing.
The invention is realized by adopting the following technical scheme:
the invention relates to a high-speed rail brake pad friction block applying a composite material transition layer, which comprises a steel backing, the composite material transition layer and a friction material which are sequentially connected, wherein the composite material transition layer and the friction material adopt the same metal elements and proportion.
The high-speed rail brake pad friction block applying the composite material transition layer is 0.1-5 mm thick.
The high-speed rail brake pad friction block applying the composite material transition layer comprises the following raw materials in parts by weight:
70-100 parts of metal powder and 1-30 parts of nonmetal powder;
the non-metal powder comprises inorganic non-metal powder.
The high-speed rail brake pad friction block applying the composite material transition layer is characterized in that metal powder in the composite material transition layer is composed of the following raw materials in parts by weight:
30-80 parts of copper powder and 10-35 parts of iron powder.
Preferably, the inorganic non-metal powder is one or more of normal salt, oxide, carbide, nitride and graphite;
the normal salt is one or more of calcium sulfate, aluminum silicate and potassium titanate;
the oxide is one or more of titanium oxide, zirconium oxide, iron oxide, ferroferric oxide, aluminum oxide and silicon dioxide;
the carbide is one or more of chromium carbide, vanadium carbide, zirconium carbide, boron carbide and silicon carbide;
the nitride is one or more of aluminum nitride, titanium nitride and vanadium nitride.
A preparation method of a high-speed rail brake pad friction block applying a composite material transition layer comprises the following steps:
a. weighing raw materials of each substance according to the weight part ratio of each substance of the composite material transition layer by using material weighing equipment, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-4 h to obtain a mixture of the composite material transition layer;
b. pouring a friction material into a material cavity of a steel die, pouring a mixed material of a composite material transition layer after mixing into an upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 100-1500 MPa;
c. and (3) placing the steel backing on a pressed blank, and performing pressure sintering in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2-6 MPa, the sintering temperature is 800-1000 ℃, and the heat preservation time is 1-4 hours, so as to prepare the high-speed rail brake pad friction block applying the composite material transition layer.
Preferably, in the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer, the pressing pressure of the pressed blank in the step b is 100-1000 MPa.
Preferably, in the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer, the sintering pressure in the step c is 2-4 MPa, and the sintering temperature in the step c is 850-950 ℃.
Preferably, the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer comprises the following specific steps:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer by using material weighing equipment, taking 70 parts of copper powder, 25 parts of iron powder, 2 parts of silicon carbide and 3 parts of aluminum nitride, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-2.5 hours to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 700 MPa;
and placing the steel backing on a pressed compact, and sintering the pressed compact in a hydrogen atmosphere sintering furnace under the conditions of the sintering pressure of 3MPa, the sintering temperature of 900 ℃ and the heat preservation time of 2.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Compared with the prior art, the invention has the following beneficial effects:
the composite material transition layer connects the friction material and the steel back, so that the friction material and the steel back are firmly combined, and the bonding strength between the friction material and the steel back is improved.
The composite material transition layer adopts the same metal elements and proportion as the friction material, and a small amount of inorganic non-metal powder is added, so that the thermal expansion of the composite material transition layer is equivalent to that of the friction material, the influence of cracks generated by the composite material transition layer and the friction material due to different thermal expansion is reduced, the composite material transition layer is tightly connected with the friction material and the steel backing, and the risk of separation of the friction material and the steel backing in the braking process is reduced.
Drawings
FIG. 1 is a schematic diagram of a friction block of a high-speed rail brake pad using a composite material transition layer according to the present invention;
the parts in the figures are numbered:
1. a steel backing; 2. a composite transition layer; 3. a friction material.
Detailed Description
The following describes in detail a specific embodiment of the present invention with reference to the drawings.
Referring to fig. 1, fig. 1 is a schematic diagram of a friction block of a high-speed rail using a composite material transition layer according to the present invention. The invention relates to a high-speed rail brake pad friction block applying a composite material transition layer, which comprises a steel backing 1, a composite material transition layer 2 and a friction material 3 which are sequentially connected, wherein the composite material transition layer 2 and the friction material 3 adopt the same metal elements and proportion.
The high-speed rail brake pad friction block applying the composite material transition layer is characterized in that the thickness of the composite material transition layer 2 is 0.1-5 mm, and the best thickness is 2-3 mm.
The high-speed rail brake pad friction block applying the composite material transition layer is characterized in that the composite material transition layer 2 is composed of the following raw materials in parts by weight:
70-100 parts of metal powder and 1-30 parts of nonmetal powder;
the non-metal powder comprises inorganic non-metal powder.
The high-speed rail brake pad friction block applying the composite material transition layer is characterized in that metal powder in the composite material transition layer 2 consists of the following raw materials in parts by weight:
30-80 parts of copper powder and 10-35 parts of iron powder.
Preferably, the inorganic non-metal powder is one or more of normal salt, oxide, carbide, nitride and graphite;
the normal salt is one or more of calcium sulfate, aluminum silicate and potassium titanate;
the oxide is one or more of titanium oxide, zirconium oxide, iron oxide, ferroferric oxide, aluminum oxide and silicon dioxide;
the carbide is one or more of chromium carbide, vanadium carbide, zirconium carbide, boron carbide and silicon carbide;
the nitride is one or more of aluminum nitride, titanium nitride and vanadium nitride.
A preparation method of a high-speed rail brake pad friction block applying a composite material transition layer comprises the following steps:
a. weighing raw materials of the composite material transition layer 2 according to the weight part ratio of the substances by using material weighing equipment, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-4 h to obtain a mixture of the composite material transition layer;
b. pouring a friction material into a material cavity of a steel die, pouring a mixed material of a composite material transition layer after mixing into an upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 100-1500 MPa;
c. and (3) placing the steel backing on a pressed blank, and performing pressure sintering in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2-6 MPa, the sintering temperature is 800-1000 ℃, and the heat preservation time is 1-4 hours, so as to prepare the high-speed rail brake pad friction block applying the composite material transition layer.
Preferably, in the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer, the pressing pressure of the pressed blank in the step b is 100-1000 MPa.
Preferably, in the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer, the sintering pressure in the step c is 2-4 MPa, and the sintering temperature in the step c is 850-950 ℃.
Preferably, the preparation method of the high-speed rail brake pad friction block applying the composite material transition layer comprises the following specific steps:
weighing raw materials according to the weight part ratio of each material of the composite material transition layer 2 by using material weighing equipment, taking 70 parts of copper powder, 25 parts of iron powder, 2 parts of silicon carbide and 3 parts of aluminum nitride, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-2.5 hours to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 700 MPa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 3MPa, the sintering temperature is 900 ℃, and the heat preservation time is 2.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 1:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 28 parts of iron powder and 4 parts of calcium sulfate, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5h to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at the pressing pressure of 750 Mpa;
the steel backing 1 is placed on a pressed compact and is pressed and sintered in a hydrogen atmosphere sintering furnace, the sintering pressure is 3MPa, the sintering temperature is 960 ℃, and the heat preservation time is 2 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 2:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 30 parts of iron powder and 2 parts of potassium titanate, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5h to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 300 Mpa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2MPa, the sintering temperature is 950 ℃, and the heat preservation time is 2.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 3:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 25 parts of iron powder, 3 parts of calcium oxide and 4 parts of titanium nitride, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 1 hour to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 700 MPa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2.5MPa, the sintering temperature is 940 ℃, and the heat preservation time is 3 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 4:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 70 parts of copper powder, 25 parts of iron powder, 2 parts of silicon carbide and 3 parts of aluminum nitride, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5h to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 700 MPa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 3MPa, the sintering temperature is 900 ℃, and the heat preservation time is 2.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 5:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 25 parts of iron powder, 2 parts of titanium oxide and 5 parts of iron oxide, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5h to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at the pressing pressure of 750 Mpa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2.5MPa, the sintering temperature is 920 ℃, and the heat preservation time is 3 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 6:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 70 parts of copper powder, 24 parts of iron powder, 5 parts of aluminum nitride and 1 part of silicon dioxide, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 1.5 hours to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 400 Mpa;
and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2MPa, the sintering temperature is 880 ℃, and the heat preservation time is 2 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 7:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 25 parts of iron powder, 5 parts of boron carbide and 2 parts of iron oxide, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 1 hour to obtain a mixture of the composite material transition layer;
pouring friction material raw materials into a material cavity of a steel die, pouring a mixed material of a composite material transition layer after mixing into an upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 600 Mpa;
the steel backing 1 is placed on a pressed compact and is pressed and sintered in a hydrogen atmosphere sintering furnace, the sintering pressure is 2.5MPa, the sintering temperature is 900 ℃, and the heat preservation time is 2 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 8:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 26 parts of iron powder, 2 parts of aluminum nitride, 1 part of silicon dioxide and 3 parts of boron carbide, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 1.5 hours to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 800 MPa;
the steel backing 1 is placed on a pressed compact and is pressed and sintered in a hydrogen atmosphere sintering furnace, the sintering pressure is 3.5MPa, the sintering temperature is 950 ℃, and the heat preservation time is 1.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 9:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 70 parts of copper powder, 25 parts of iron powder, 2 parts of titanium nitride, 1 part of silicon dioxide and 2 parts of calcium sulfate, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 2 hours to obtain a mixture of the composite material transition layer; pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at the pressing pressure of 900 Mpa; the steel backing 1 is placed on a pressed compact and is pressed and sintered in a hydrogen atmosphere sintering furnace, the sintering pressure is 4MPa, the sintering temperature is 960 ℃, and the heat preservation time is 3 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Example 10:
weighing raw materials according to the weight part ratio of each substance of the composite material transition layer 2 by using material weighing equipment, taking 68 parts of copper powder, 27 parts of iron powder, 4 parts of titanium oxide and 1 part of boron carbide, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 3 hours to obtain a mixture of the composite material transition layer; pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 1000 Mpa; and (3) placing the steel backing 1 on a pressed blank, and sintering the pressed blank under pressure in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 5MPa, the sintering temperature is 980 ℃, and the heat preservation time is 3.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
Claims (10)
1. The high-speed rail brake pad friction block applying the composite material transition layer is characterized by comprising a steel backing (1), the composite material transition layer (2) and a friction material (3) which are sequentially connected, wherein the composite material transition layer (2) and the friction material (3) adopt the same metal elements and proportion.
2. The high-speed rail brake pad friction block applying the composite material transition layer as claimed in claim 1, wherein the thickness of the composite material transition layer (2) is 0.1-5 mm.
3. The high-speed rail brake pad friction block applying the composite material transition layer as claimed in claim 1, wherein the composite material transition layer (2) is composed of the following raw materials in parts by weight:
70-100 parts of metal powder and 1-30 parts of nonmetal powder;
the non-metal powder comprises inorganic non-metal powder.
4. The high-speed rail brake pad friction block applying the composite material transition layer as claimed in claim 3, wherein the metal powder in the composite material transition layer (2) is composed of the following raw materials in parts by weight:
30-80 parts of copper powder and 10-35 parts of iron powder.
5. The high-speed rail brake pad friction block applying the composite material transition layer according to claim 3, wherein the inorganic non-metal powder is one or more of normal salt, oxide, carbide, nitride and graphite;
the normal salt is one or more of calcium sulfate, aluminum silicate and potassium titanate;
the oxide is one or more of titanium oxide, zirconium oxide, iron oxide, ferroferric oxide, aluminum oxide and silicon dioxide;
the carbide is one or more of chromium carbide, vanadium carbide, zirconium carbide, boron carbide and silicon carbide;
the nitride is one or more of aluminum nitride, titanium nitride and vanadium nitride.
6. The preparation method of the high-speed rail brake pad friction block applying the composite material transition layer, which is characterized by comprising the following steps of:
a. weighing raw materials of the composite material transition layer (2) according to the weight part ratio of the substances by using material weighing equipment, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-4 h to obtain a mixture of the composite material transition layer;
b. pouring a friction material into a material cavity of a steel die, pouring a mixed material of a composite material transition layer after mixing into an upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 100-1500 MPa;
c. and (3) placing the steel backing on a pressed blank, and performing pressure sintering in a hydrogen atmosphere sintering furnace, wherein the sintering pressure is 2-6 MPa, the sintering temperature is 800-1000 ℃, and the heat preservation time is 1-4 hours, so as to prepare the high-speed rail brake pad friction block applying the composite material transition layer.
7. The method for preparing a high-speed rail brake pad friction block with a composite material transition layer as claimed in claim 6, wherein the pressing pressure of the green compact in the step b is 100-1000 MPa.
8. The method for preparing a high-speed rail brake pad friction block with a composite material transition layer as claimed in claim 6, wherein the sintering pressure in the step c is 2-4 MPa.
9. The method for preparing a high-speed rail brake pad friction block with a composite material transition layer as claimed in claim 6, wherein the sintering temperature in the step c is 850-950 ℃.
10. The method for preparing the high-speed rail brake pad friction block applying the composite material transition layer as claimed in claim 6, which is characterized by comprising the following specific steps of:
weighing raw materials according to the weight part ratio of each material of the composite material transition layer (2) by using material weighing equipment, taking 70 parts of copper powder, 25 parts of iron powder, 2 parts of silicon carbide and 3 parts of aluminum nitride, putting the raw materials into a three-dimensional mixer, and uniformly stirring for 0.5-2.5 hours to obtain a mixture of the composite material transition layer;
pouring the friction material raw material into a material cavity of a steel die, pouring the mixed material of the composite material transition layer after mixing into the upper layer of the friction material in the material cavity of the steel die, simultaneously pressing the mixed material of the composite material transition layer and the friction material to obtain a pressed blank, and performing cold press molding at a pressing pressure of 700 MPa;
the steel backing (1) is placed on a pressed compact and is pressed and sintered in a hydrogen atmosphere sintering furnace, the sintering pressure is 3MPa, the sintering temperature is 900 ℃, and the heat preservation time is 2.5 hours. And preparing the high-speed rail brake pad friction block applying the composite material transition layer.
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| CN202011635124.9A CN112682447A (en) | 2020-12-31 | 2020-12-31 | High-speed rail brake pad friction block applying composite material transition layer and preparation method thereof |
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| CN202011635124.9A CN112682447A (en) | 2020-12-31 | 2020-12-31 | High-speed rail brake pad friction block applying composite material transition layer and preparation method thereof |
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Cited By (1)
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