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A method of adding polytetrafluoroethylene to improve the uniformity of composite materials prepared by friction stir processing

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

Inactive Publication Date: 2017-11-21
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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  • A method of adding polytetrafluoroethylene to improve the uniformity of composite materials prepared by friction stir processing
  • A method of adding polytetrafluoroethylene to improve the uniformity of composite materials prepared by friction stir processing
  • A method of adding polytetrafluoroethylene to improve the uniformity of composite materials prepared by friction stir processing

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specific Embodiment approach 2

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

specific Embodiment approach 3

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

specific Embodiment approach 4

[0034] Specific implementation manner 4: Combination figure 1 To illustrate this embodiment, the content of PTFE in step 1 of this embodiment is 5%, and the other steps are the same as the second embodiment.

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Abstract

The invention discloses a method for adding polytetrafluoroethylene to improve the uniformity of composite materials prepared by friction stir processing, which is realized through the following steps: taking a certain proportion of PTFE powder and M alloy powder, mixing and storing them evenly; drilling a blind hole in the middle of a base plate , fill the uniformly mixed powder into the prepared base plate and compact it; perform friction stir processing on the powder filled area on the base plate, under the action of friction heat generation of the stirring head and rotation of the stirring pin, PTFE promotes the M alloy powder Fully react with Al to form Al-M intermetallic compounds and evenly distribute on the matrix, and finally obtain a uniform intermetallic compound-reinforced metal matrix composite. The invention has the following advantages: the invention solves the agglomeration phenomenon in the in-situ composite material synthesis process of pure alloy powder friction stir processing, and the intermetallic compound reinforcement phase is evenly distributed in the matrix by adding PTFE.

Description

Technical field [0001] The invention relates to a method for in-situ synthesis of an intermetallic compound reinforced metal matrix composite material by friction stir processing, in particular to a method for adding polytetrafluoroethylene powder to improve the uniformity of the composite material prepared by FSP. 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 composite of materials has become an important direction of material development. Metal matrix composites have received extensive attention from researchers because of their high specific strength, high specific modulus, excellent wear resistance, dimensional stability and other characteristics. Friction stir processing technology can solve the problems of contamination of mechanical alloying products and poor wet...

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Application Information

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Patent Type & Authority Patents(China)
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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