Method for producing bearing shell material of nano composite aluminium base

A nano-composite and manufacturing method technology, applied in the field of manufacturing nano-composite aluminum-based bearing materials, can solve problems such as the inability to obtain a uniformly dispersed Pb alloy structure, high power requirements for work-hardening rolling mills, and difficulty in effective hot-rolling and compounding. Achieve the effects of enhanced wear resistance, low cost, and improved coating bonding strength

Inactive Publication Date: 2005-12-14
SOUTH CHINA UNIV OF TECH
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Problems solved by technology

The solid-phase cold rolling method used in the existing steel-aluminum bimetallic composite plate has problems such as relatively low initial bonding strength, large deformation (~70%) required for firm bonding, serious work hardening, and high requirements for rolling mill power.
If hot rolling is used, in the absence of atmosphere protection, due to the oxidation of the surface of the steel plate to form an unstable oxide layer, it is difficult to carry out hot rolling compounding effectively.
[0006] No. 02111805.1 Chinese invention patent application discloses a horizontal continuous casting compound device for Al-Pb alloy-steel back bearing material. This method belongs to the field of casting. Although Al-Pb bearing material can be obtained, it cannot obtain Pb evenly dispersed in Al. Alloy structure of matrix

Method used

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  • Method for producing bearing shell material of nano composite aluminium base
  • Method for producing bearing shell material of nano composite aluminium base
  • Method for producing bearing shell material of nano composite aluminium base

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Experimental program
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Embodiment 2

[0023] The scanning electron micrograph (SEM) of the Al-Pb-Cu bearing alloy that embodiment 2 manufactures is as figure 1 As shown in the figure, 1 is the steel plate, 2 is the thermal sprayed Al layer, and 3 is the Al-Pb-Cu alloy layer. It can be seen that the Al-Pb-Cu alloy layer has been well combined with the thermal sprayed Al steel back to form a A "sandwich" sandwich structure, and the rolling layer structure is uniform and dense. figure 2 yes figure 1 The enlarged scanning electron microscope photo of the Al-Pb-Cu alloy layer in the middle, it can be seen from the figure that the Pb phase (ie 4) is uniformly dispersed in the aluminum matrix, and many finer particles that cannot be distinguished are dispersed on the matrix. Pb particles, the off-white area is CuAl 2 Phase enrichment zone (ie 5).

Embodiment 1

[0024] The Al-Pb-Cu bearing alloys produced in Example 1, Example 3, Example 4, Example 5 and Example 6 have uniform and dispersed distribution, and the hardness value is between Hv55 and 80. The casting method and powder metallurgy method The hardness of aluminum-based bearing alloys is only between Hv30 and 50, so the hardness of nano-composite Al-Pb-Cu bearing alloys is more than twice that of ordinary aluminum-based bearing alloys. Under the conditions of load 196N, speed 400r / min, and dry friction, the wear time is 1 hour. The wear performance of the material is shown in Table 2.

[0025] Table 1

[0026]

[0027] The thickness is about 4mm, press

[0028] Compostion

[0029] It can be seen from Table 2 that the wear amount of the Al-Pb-Cu bearing alloy prepared by mechanical alloying is significantly lower than that of the Al-Pb alloy obtained by the P / M method and the Stricast method, and the wear resistance of the alloy has been greatly improve...

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Abstract

The invention relates to a manufacturing method of a nanocomposite aluminum-based bearing material, which uses high-purity, particle-sized Al, Pb, and Cu powders according to a certain weight percentage of Al+Pb+Cu under argon protection, and uses a ball mill to perform high-energy ball milling. , After ball milling in a ball mill at a certain speed for a certain period of time, the powder prepared by ball milling is rolled and compounded on a thermal sprayed aluminum steel back by continuous powder pressing, and then sintered at different temperatures under the protection of argon, and then cooled. The invention has the advantages of simple process, low manufacturing cost, and easy realization of large-scale industrial production. The invention can obtain a nanocrystalline Al-based solid solution as a matrix on which Pb and Cu are evenly distributed. 9 al 4 、CuAl 2 The nano-phase composite structure of the second phase, the wear resistance of the manufactured Al-Pb-Cu bearing material has been greatly improved.

Description

technical field [0001] The invention relates to the technical field of manufacturing bearing pad materials by a continuous powder pressing method, in particular to a manufacturing method of a nanocomposite aluminum-based bearing pad material. Background technique [0002] Aluminum-based alloys mainly refer to Al-Pb-Cu (wherein, Pb can be replaced by Sn). To prepare Al-Pb-based alloys, people initially used traditional casting methods, but Al-Pb is a mutually insoluble system, and the densities of Al and Pb metals are very different, and serious monotectic problems are likely to occur during the casting process. In order to overcome these problems, some researchers have used various methods such as stir casting and rapid solidification to prepare Al-Pb alloys in recent years, in order to obtain uniform structure and good friction and wear properties. Although these methods have improved the structure of the alloy to a certain extent, Pb is mainly ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F7/04
Inventor 朱敏曾美琴欧阳柳章李尚周
Owner SOUTH CHINA UNIV OF TECH
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