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Preparation method of self-lubricating copper-based powder metallurgy structural part for helicopter

A copper-based powder, self-lubricating technology, applied in the field of powder metallurgy, can solve problems such as the service life does not meet the requirements

Pending Publication Date: 2021-03-23
CHANGHE AIRCRAFT INDUSTRIES CORPORATION
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The original structural parts with self-lubricating function belong to the form of aluminum alloy and liner, and the service life does not meet the requirements

Method used

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  • Preparation method of self-lubricating copper-based powder metallurgy structural part for helicopter

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Embodiment Construction

[0024] The preparation method of the self-lubricating copper-based powder metallurgy structural part for helicopters provided by the present invention will be explained below in conjunction with the accompanying drawings.

[0025] The purpose of the present invention is to prepare a graphite-containing tin bronze sintered part with a density of 6.5-7.1g / cm3, a tensile strength σb≥92MPa, and a self-lubricating function by adopting a powder metallurgy process. It is used as an assembly component of the helicopter autoclinometer to ensure the smooth realization of the function of the autoclinometer.

[0026] In the invention, a certain amount of graphite and paraffin are added to copper and tin metal powders, uniformly mixed, pressed and formed, and then sintered in a protective atmosphere to realize a copper-based powder metallurgy structural part whose comprehensive performance meets the requirements of use. The present invention can improve the self-lubricating performance of ...

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Abstract

The invention provides a preparation method of a self-lubricating copper-based powder metallurgy structural part for a helicopter. The preparation method comprises the steps that 1, copper metal powder, tin metal powder, graphite and paraffin are selected according to the requirements of the structural part; step 2, copper and tin metal powder are fully and uniformly mixed with graphite and paraffin to obtain uniformly mixed powder; and step 3, the uniformly mixed powder is pressed into a green body by adopting isostatic cool pressing, and the green body is sintered in an H2 protective atmosphere. By adding the graphite, the self-lubricating property of the structural part can be improved; and paraffin is added, it can be guaranteed that graphite with the large density difference is uniformly mixed with copper and tin metal powder, the influence of component segregation caused by the density difference can be eliminated, and the density requirement is met.

Description

technical field [0001] The invention belongs to the field of powder metallurgy, and relates to a method for preparing a self-lubricating copper-based powder metallurgy structural part for a helicopter. Background technique [0002] The helicopter control system includes an automatic inclinometer, whose main function is to realize the control of the collective pitch and periodic variable pitch of the rotor, and then realize the movement of the helicopter such as lifting, forward and backward, and left and right. [0003] To realize the function of automatic inclinometer, it is necessary to install structural parts with self-lubricating effect in its assembly components. The original structural parts with self-lubricating function belong to the form of aluminum alloy and liner, and the service life does not meet the requirements. Contents of the invention [0004] The invention provides a method for preparing self-lubricating copper-based powder metallurgy structural parts ...

Claims

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Application Information

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IPC IPC(8): B22F3/02B22F3/04B22F3/10B22F1/00
CPCB22F3/02B22F3/04B22F3/1007B22F2003/023B22F2201/013B22F2998/10B22F1/105B22F1/103B22F1/10
Inventor 周训伟巢昺轩项洪涛郭楠李智勇熊曦耀应俊龙李岚刘小丹
Owner CHANGHE AIRCRAFT INDUSTRIES CORPORATION
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