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Method for improving uniformity of composite material manufactured by friction stir processing through adding polytetrafluoroethylene

A polytetrafluoroethylene and friction stir technology, used in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problem of enhancing the inhomogeneity of metal matrix composite materials, and achieve the effect of increasing the amount of formation

Inactive Publication Date: 2015-10-28
NANCHANG HANGKONG UNIVERSITY
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Problems solved by technology

[0005] The purpose of the present invention is to provide a method of adding polytetrafluoroethylene (PTFE) to improve friction stir processing (FSP) in order to solve the problem of inhomogeneity that is difficult to solve by in-situ synthesis of intermetallic compound reinforced metal matrix composites during friction stir processing of pure alloy powder. Method for making composite homogeneity

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  • Method for improving uniformity of composite material manufactured by friction stir processing through adding polytetrafluoroethylene
  • Method for improving uniformity of composite material manufactured by friction stir processing through adding polytetrafluoroethylene
  • Method for improving uniformity of composite material manufactured by friction stir processing through adding polytetrafluoroethylene

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specific Embodiment approach 2

[0032] Specific implementation mode two: combination figure 1 Describe this embodiment, the content of PTFE among the step one of this embodiment is 1%, the diameter of hole is 3mm, interval 4mm, depth of blind hole 4mm, stirring head rotation speed 950 r / min, welding speed 30mm / min, stirring The head inclination angle is 2°, and the processing passes are 5 times.

specific Embodiment approach 3

[0033] Specific implementation mode three: combination figure 1 To illustrate this embodiment, the content of PTFE in the first step of this embodiment is 3%, and the other steps are the same as in the second embodiment.

specific Embodiment approach 4

[0034] Specific implementation mode four: combination figure 1 To illustrate this embodiment, the content of PTFE in the first step of this embodiment is 5%, and the other steps are the same as in the second embodiment.

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Abstract

The invention discloses a method for improving uniformity of a composite material manufactured by friction stir processing through adding polytetrafluoroethylene. The method is implemented through the following steps: taking PTFE powders and M alloy powders in a certain proportion, uniformly mixing the powders to store; punching a blind hole on the center of a substrate panel, filling the uniformly mixed powders into the prepared substrate panel and pressing the powders; performing friction stir processing on a powder filling region on the substrate panel, a stir head generating heat by friction and under the action of rotation stirring of a stirring pin, the PTFE accelerating the M alloy powders to fully react with Al to form an Al-M intermetallic compound, the Al-M intermetallic compound uniformly distributing on the substrate, and finally, uniform intermetallic compound reinforced metal matrix composite material is obtained. The method is advantaged in that the method solves agglomeration phenomenon in an in-situ synthesized composite material process using pure alloy powder friction stir processing, and through adding the PTFE, intermetallic compound reinforcement phase is uniformly distributed in the substrate.

Description

technical field [0001] The invention relates to a method for in-situ synthesis of intermetallic compound-reinforced metal-matrix composite materials through friction stir processing, in particular to a method for improving the uniformity of composite materials prepared by FSP by adding polytetrafluoroethylene powder. Background technique [0002] With the rapid development of aerospace, electronics, and advanced weapon systems, traditional single structural materials are increasingly difficult to meet the needs of light weight, high strength, and high wear resistance. The compounding of materials has become an important direction for material development. Metal matrix composites have attracted extensive attention from researchers because of their high specific strength, high specific modulus, excellent wear resistance, and dimensional stability. Friction stir processing technology is an ideal preparation technology for the synthesis of intermetallic compound composites becau...

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Application Information

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IPC IPC(8): B23K20/12
CPCB23K20/1275B23K20/128
Inventor 黄春平王承剑汪云海张海军夏春柯黎明
Owner NANCHANG HANGKONG UNIVERSITY
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