Method for preparing tin content step-up PVD bushing in antifriction layer

A bearing and content technology, applied in the field of preparing PVD bearing pads with tin content in the antifriction layer, can solve the problems of stickiness, unreasonable content and distribution of tin components in the sliding layer, affecting the performance of PVD bearing pads, etc., so as to improve the adhesion Effect of strength, good anti-stick properties or run-in properties

Inactive Publication Date: 2008-07-09
CHONGQING YUEJIN MACHINERY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the influence of the original processing technology, the content and distribution of tin components in the sliding layer are unreasonable, and the tin content in the sliding layer does not change much in the bottom layer, middle layer and surface layer. If it is lower, different degrees of viscosity may occur during operation, which will affect the performance of PVD bearings.

Method used

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  • Method for preparing tin content step-up PVD bushing in antifriction layer
  • Method for preparing tin content step-up PVD bushing in antifriction layer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] (1) Target preparation

[0018] The nickel target adopts a nickel target with a purity of 99.99%; the aluminum alloy target is configured with pure tin, pure copper and pure aluminum in a ratio of 16%: 0.3%: 83.7% by weight, and is first smelted into blocks in an electric arc melting furnace Shaped alloy, then extruded, cooled to room temperature with the furnace, and processed into a sputtering target that meets the requirements of the sputtering instrument.

[0019] (2) Bearing base pretreatment

[0020] First, polish the bearing bush, then put it into the treatment tank, remove the oxide layer and oil stain through chemical degreasing, pickling, electrolytic degreasing and ultrasonic cleaning, and then put it into the oven for drying. on the fixture in the shooting bay.

[0021] (3) PVD bearing bush prepared by sputtering

[0022] ① Sputtering nickel gate layer 4

[0023] The nickel gate layer is sputtered with conventional process steps and process parameters. ...

Embodiment 2

[0033] (1) Target preparation

[0034]The nickel target material is a nickel target with a purity of 99.99%. The aluminum alloy target material is configured with pure tin, pure copper and pure aluminum in a ratio of 20%: 1.6%: 78.4% by weight. Other steps are the same as in Example 1.

[0035] (2) Bearing base pretreatment

[0036] This step is the same as in Example 1.

[0037] (3) PVD bearing bush prepared by sputtering

[0038] ① Sputtering the first diffusion layer 3

[0039] Before the nickel grid layer is sputtered in Example 1, the sputtering diffusion layer step is added to improve the adhesion strength between the nickel grid layer and the substrate. The substrate lining layer 1 where the bearing bush substrate participates in mutual sputtering is CuPbSn, and the substrate temperature is 50°C. The air pressure is 0.4Pa, the negative bias of the PVD bearing substrate is -1700V; the current of the PVD bearing substrate is 2A; the negative bias of the nickel target i...

Embodiment 3

[0053] (1) Target preparation

[0054] The nickel target material is a nickel target with a purity of 99.99%; the aluminum alloy target material is configured with pure tin, pure copper and pure aluminum in a ratio of 25%:3%:72% by weight, and other steps are the same as in Example 1.

[0055] (2) Bearing base pretreatment

[0056] This step is the same as in Example 1.

[0057] (3) PVD bearing bush prepared by sputtering

[0058] ① Sputtering the first diffusion layer 3

[0059] The process and equipment are the same as in Example 1, except that the process conditions of the magnetron sputtering first diffusion layer 3 are as follows: the substrate temperature is 98°C, the sputtering pressure is 1Pa, and the negative bias voltage of the PVD bearing substrate is -300V; The PVD bearing substrate current is 0.5A; the negative bias voltage of the nickel target is -620V; the nickel target current is 1A; the treatment time: 40 minutes; the weight percentage of each component of ...

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Abstract

The invention relates to a method for preparing a PVD bearing whose tin content is increased in a friction reducing layer. After a Ni gate layer is sputtered on the bearings, first the bearings are smelted into massive alloy in a vacuum melting furnace then is pressed to form, after cooling, and the bearings are assembled into a target. Aluminum alloy target and a bearing base are arranged in a sputtering chamber, the vacuum degree of the back bottom of the sputtering chamber is Pa, the working gas is argon, sputtering pressure, sputtering power, base temperature of the sputtering chamber are adjusted, then the absolute value of the contingent negative bias is decreased from 460-520V to 100-160V in four hours, the tin content in a sliding layer is ascended from a bottom layer to a surface layer in a cascade. The PVD bearing with the distribution has the carrying capacity which is reached to 70-100N / mm2, and has excellent ant-plastering performance or running-in characteristic. The conformability and adaptability are very important particularly in a beginning period of running a diesel engine, and the PVD bearing which is provided by the scheme is rightly capable of meeting the demands.

Description

technical field [0001] The invention relates to a magnetron sputtering coating method for a bearing bush. The bearing bush has a concave and curved surface. A nickel grid layer and an aluminum alloy friction-reducing layer are formed on the inner surface of the bearing bush by magnetron sputtering. This kind of bearing bush is mainly used for Engines under high load conditions, such as high-end marine diesel engines, luxury car engines and aero engines. Background technique [0002] The bearing bush is the key moving part of the heart of the diesel engine, and it is also the basic part and the consumable part. The failure of the bearing bush in use will directly lead to serious consequences such as deformation or rupture of the main engine cylinder. [0003] In recent years, various hosts have developed rapidly, and the load and specific pressure have increased significantly, which puts forward stricter requirements on bearing components such as sliding bearings. Single-lay...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23C14/35C23C14/16C23C14/54
Inventor 冀庆康刘萍吴文俊
Owner CHONGQING YUEJIN MACHINERY
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