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Brake block friction material taking Mn+1XAn lamellar compound as antifriction phase and preparation method

A layered compound and friction material technology, applied in the direction of friction linings, mechanical equipment, etc., can solve the problems of low cost performance, change of friction coefficient of brake pads, short life, etc., and achieve the effect of improving stability and reliability

Inactive Publication Date: 2015-03-18
YANSHAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Relevant studies have shown that the existing brake pad materials are difficult to meet the requirements of continuously increasing vehicle speeds, especially the friction heat caused by braking friction at high speeds. The antifriction material commonly used in semi-metallic brake pads - graphite has been proposed. Question: The high temperature caused by frictional heat often exceeds 600°C or even higher, which will cause the oxidation of graphite with an anti-oxidation temperature of only 400°C, which will cause a large change in the overall friction coefficient of the brake pad, making the brake pad work unstable and shorten the service life. Short, causing high-speed rail safety to be challenged [1 Meng Fanai, Wang Huancheng, Pei Longgang, a high-speed train brake pad and its preparation method, Chinese patent: CN101571173A, 2009.11.4]
Carbon / carbon composite materials used for aircraft brake pads also have problems such as low cost performance and easy oxidation [2 Chen Xianhai, Lin Hong, Chen Jiachun, Friction materials and the manufacturing process of aircraft brake pads using the friction materials, Chinese patent: CN102604596A, 2012.7 .25], even by adding more anti-oxidation boron nitride (hBN), molybdenum sulfide (MoS 2 ) and other anti-friction phases, 8-16% graphite must also be added, it is hard to believe that this material can greatly improve the oxidation resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Weigh by mass percentage: copper powder (Cu) 45%, nickel powder (Ni) 5%, iron powder (Fe) 12%, silicon oxide powder (SiO 2 ) 5%, chromium powder (Cr) 3%; the particle size of the above powder is -200 mesh, put the above powder into a three-dimensional mixer and mix evenly for 60 minutes, then add Ti 3 SiC 2 30% (grain size 120-170 mesh) and continue mixing for 30 minutes; put the mixed composite powder into a graphite mold, place it between the upper and lower pressure heads of the sintering chamber of the hot press, close the sintering chamber door, and evacuate to ( 6-9)×10 -3 Pa, then stop vacuuming and fill with argon; the pressure of the upper and lower pressure heads rises to 30-35MPa, the temperature is 900°C, and keeps at this temperature for 15 minutes; after the heat preservation is completed, cool naturally to 58°C, turn off the argon, and take Graphite mould, disassemble the mould, and take out the block of composite friction material.

[0017] The avera...

Embodiment 2

[0019] Weigh by mass percentage: copper powder (Cu) 40%, nickel powder (Ni) 4%, iron powder (Fe) 15%, silicon oxide powder (SiO 2 ) 5%, chromium powder (Cr) 2%; the particle size of the above powder is -200 mesh, put the above powder into a three-dimensional mixer and mix evenly for 60 minutes, then add Ti 3 SiC 2 32% (particle size 120-170 mesh), molybdenum sulfide powder (MoS 2 ) 2%, continue mixing for 30 minutes; put the mixed composite powder into a graphite mold, place it between the upper and lower pressure heads of the sintering chamber of the hot press, close the sintering chamber door, and evacuate to (6-9)×10 -3 Pa, then stop vacuuming, and fill with argon; the pressure of the upper and lower heads rises to 30MPa, the temperature is 950°C, and keeps at this temperature for 30 minutes; after the heat preservation is completed, naturally cool to 60°C, turn off the argon, and take out the graphite mold , disassemble the mold, and take out the composite friction mate...

Embodiment 3

[0022] Weigh by mass percentage: copper powder (Cu) 45%, nickel powder (Ni) 5%, iron powder (Fe) 12%, silicon oxide powder (SiO 2 ) 5%, chromium powder (Cr) 3%; the particle size of the above powder is -200 mesh, put the above powder into a three-dimensional mixer and mix evenly for 60 minutes, then add Ti 3 AlC 2 30% (grain size 120-170 mesh) and continue mixing for 30 minutes; put the mixed composite powder into a graphite mold, place it between the upper and lower pressure heads of the sintering chamber of the hot press, close the sintering chamber door, and evacuate to ( 6-9)×10 -3 Pa, then stop vacuuming and fill with argon; the pressure of the upper and lower pressure heads rises to 45-50MPa, the temperature is 900°C, and keeps at this temperature for 15 minutes; after the heat preservation is completed, naturally cool to 60°C, turn off the argon, and take Graphite mould, disassemble the mould, and take out the block of composite friction material.

[0023] The avera...

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Abstract

The invention discloses a brake block friction material taking a Mn+1XAn lamellar compound as an antifriction phase and a preparation method. The friction material comprises components in percentage by mass as follows: 20%-60% of copper, 0-20% of nickel, 5%-15% of ferrum, 3%-10% of silicon oxide, 0-10% of chromium, 0-4% of molybdenum sulfide and 15%-35% of Mn+1XAn, and the components are technical pure. The preparation method for the friction material comprises the steps as follows: (1) mixing the raw materials; (2), assembling; and (3) hot pressed sintering. The hardness of the copper based friction composite material sintering body obtained by the invention is HRB56-65, and the relative density is 92%-94%. Moreover, the friction coefficient ranges from 0.38 to 0.53, is still maintained within the range at the room temperature of subzero 600 DEG C, and is stabilized in a range from about 0.40 to 0.43 after initial seconds, excellent high-temperature stability is shown, and use requirements of brake blocks of high speed trains can be met completely.

Description

technical field [0001] The invention relates to a friction composite material for a high-speed brake pad, belonging to the field of composite material manufacturing. Background technique [0002] The high speed of railway trains urgently needs a suitable safety braking system, and brake pads are the key components. Relevant studies have shown that the existing brake pad materials are difficult to meet the requirements of continuously increasing vehicle speeds, especially the friction heat caused by braking friction at high speeds. The antifriction material commonly used in semi-metallic brake pads - graphite has been proposed. Question: The high temperature caused by frictional heat often exceeds 600°C or even higher, which will cause the oxidation of graphite with an anti-oxidation temperature of only 400°C, which will cause a large change in the overall friction coefficient of the brake pad, making the brake pad work unstable and shorten the service life. Short, causing h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C32/00C22C1/04F16D69/02
Inventor 王明智孟凡爱赵玉成李晓普冯兵强张兴旺
Owner YANSHAN UNIV
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