Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material

A friction material and powder metallurgy technology, applied in the field of materials, can solve the problem of inability to achieve high-strength connection between iron-based powder metallurgy materials and steel backs, and achieve the effects of promoting bonding, improving shear strength and high reliability

Inactive Publication Date: 2016-07-20
XIAN AVIATION BRAKE TECH
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  • Application Information

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Problems solved by technology

[0005] In order to overcome the deficiency in the prior art that the high-strength connection between the iron-based powder metallurgy material and the steel back cannot be realized, the present invention proposes a bonding method and bonding material for the powder metallurgy iron-based friction material layer and the steel back

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  • Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material
  • Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material
  • Bonding method of powder metallurgy iron-based friction material layer and steel backing and bonding material

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Embodiment Construction

[0051] The invention relates to a bonding material for bonding a powder metallurgy iron-based friction material layer and a steel back.

[0052] The present invention specifically describes the implementation process of the present invention through 8 embodiments.

[0053] The specific process of bonding the powder metallurgy iron-based friction material layer and the steel back proposed by the present invention is:

[0054] Step 1. Raw material processing:

[0055] (1) Reduction: Reduce the iron powder and copper powder under the protection of hydrogen atmosphere to eliminate the oxygen content and work hardening phenomenon in the metal powder. The reduction temperature of the iron powder is 600-700°C, and the reduction temperature of the copper powder is 350-450°C. The heat preservation time in the reduction is 2 to 3 hours.

[0056] (2) Ball milling: put the reduced iron powder and copper powder into a ball mill for ball milling; the iron powder ball milling time is 0.5-...

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Abstract

Provided is a bonding method of a powder metallurgy iron-based friction material layer and a steel backing and a bonding material. According to the bonding method, mixed powder is paved and spread to achieve the bonding of a copper-based powder metallurgy material and the steel backing along with the bonding of spraying metal powder and organic solvent at the normal temperature; the bonding material with the thickness of 0.05-0.15mm is added between a powder metallurgy iron-based friction material and the steel backing; after being sintered, the powder metallurgy iron-based friction material and the steel backing are made to have a good bonding property and the steel backing brittleness and cracks are prevented. Tin is added in a formula of the bonding material, and the tin is made to form a liquid phase, and the tin is diffused in the interior of the bonding material and the contact portion of the bonding material and the steel backing to form an alloy body which can exert the bonding effect, and the effectiveness of bonding is enhanced. When added copper powder ensures the thickness of the bonding material to reach 0.05-0.15mm, the added copper powder can reduce the possibility that carbon in a friction material is diffused toward the steel backing, and thus the embrittlement of the steel backing due to carbon infiltration is prevented, in addition, the shearing strength of the bonding material can be effectively improved.

Description

technical field [0001] The invention relates to the field of materials, in particular to a method for connecting a powder metallurgy iron-based friction material and a steel back. Background technique [0002] Because powder metallurgy iron-based friction materials contain a large amount of non-metallic components, the material is brittle and the mechanical strength is not high enough. Especially when it is subjected to impact load, it will produce defects such as brittle fracture and block loss. Therefore, a certain strength is often used in engineering applications. As the reinforcing element of the powder metallurgy layer, the steel back is bonded together by sintering to form a double-layer structure, so as to achieve the purpose of ensuring the friction and wear performance and improving the mechanical strength. Therefore, the combination of the powder metallurgy layer and the steel back will be directly Affect the performance of the powder metallurgy layer. [0003] W...

Claims

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Application Information

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IPC IPC(8): B22F1/00B22F7/08C22C9/00C22C32/00
CPCB22F1/0003C22C9/00C22C32/0063B22F7/064
Inventor 刘联军李利陈美娜卢宏张婧琳
Owner XIAN AVIATION BRAKE TECH
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