Al-Pb alloy wear resistant layer preparation method based on friction stir processing

An alloy wear-resistant layer and friction stir technology, which is applied in metal processing equipment, welding equipment, manufacturing tools, etc., can solve the problems of limited improvement in homogenization, high cooling speed, uneven Al-Pb alloy, etc., and achieve improved segregation Problems, the effect of reducing the amount of wear

Active Publication Date: 2018-12-21
CHANGSHU INSTITUTE OF TECHNOLOGY
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since there is a liquid immiscible melting zone in Al-Pb alloys, and the density difference between Al and Pb is large, the conventional method often obtains uneven and severely segregated Al-Pb alloys.
Solidified Al-Pb alloys of different shapes and weights can be obtained by rapid solidification, but this technology requires a sufficiently high cooling rate and the production cost is high
Pb powder and Al powder can be extremely refined by mechanical alloying method, which can overcome the macro-segregation problem of Al-Pb alloy, but the degree of homogenization is limited, and the ball milling time is long, which requires further sintering and pressure processing, and the preparation is more cumbersome.

Method used

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  • Al-Pb alloy wear resistant layer preparation method based on friction stir processing
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  • Al-Pb alloy wear resistant layer preparation method based on friction stir processing

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-4

[0026] Substrate 1 is made of 1060 pure aluminum plate, the size is 160×100×6mm, the chemical composition is Si: 0.25%, Fe: 0.35%, Mn: 0.03%, Mg: 0.03%, Al: 99.6%, and it is ground by CNC grinding machine Keep the upper and lower ends of the aluminum plate parallel, and cut out 0.37mm (width)×4mm (depth), 0.58mm (width)×4mm (depth), 0.79mm (width)×4mm (depth), 1.03mm (width) × 4mm (depth) through the groove 2, the groove spacing is 6mm, use acetone to remove the oil in the groove, and finally use ultrasonic cleaning to clean the aluminum plate, the particle size of the lead powder is 5, 8, 10μm, and the density is 5.65g / cm 3 According to the aforementioned formula, the slot widths of 0.37mm, 0.58mm, 0.79mm, and 1.03mm correspond to lead contents of 12%, 18%, 24%, and 30%, respectively.

[0027] Use a key to evenly fill the groove with lead powder. The needleless stirring head is made of 45 steel, and the set rotation speed is 800-1000r / min, and the travel speed is 50-80mm / mi...

Embodiment 5-8

[0034] Substrate 1 is made of 1060 pure aluminum plate, the size is 160×100×8mm, the chemical composition is Si: 0.25%, Fe: 0.35%, Mn: 0.03%, Mg: 0.03%, Al: 99.6%, and it is ground by CNC grinding machine Keep the upper and lower ends of the aluminum plate parallel, and cut 0.37mm (width) × 5mm (depth), 0.58mm (width) × 5mm (depth), 0.79mm (width) × 5mm (depth) on the surface of 4 aluminum plates, respectively. 1.03mm (width) × 5mm (depth) through the groove 2, the groove spacing is 6mm, use acetone to remove the oil in the groove, and finally use ultrasonic cleaning to clean the aluminum plate, the particle size of lead powder is 5, 8, 10 μm, and the density is 5.65g / cm 3 According to the aforementioned formula, the slot widths of 0.37mm, 0.58mm, 0.79mm, and 1.03mm correspond to lead contents of 12%, 18%, 24%, and 30%, respectively.

[0035] Use a key to evenly fill the groove with lead powder. The needleless stirring head is made of 45 steel, and the set rotation speed is ...

Embodiment 9-12

[0042] Substrate 1 is made of 1060 pure aluminum plate, the size is 160×100×10mm, the chemical composition is Si: 0.25%, Fe: 0.35%, Mn: 0.03%, Mg: 0.03%, Al: 99.6%, and it is ground by CNC grinding machine Keep the upper and lower ends of the aluminum plate parallel, and cut 0.37mm (width) × 6mm (depth), 0.58mm (width) × 6mm (depth), 0.79mm (width) × 6mm (depth) on the surface of the four aluminum plates, respectively. 1.03mm (width) × 6mm (depth) through the groove 2, the groove spacing is 6mm, use acetone to remove the oil in the groove, and finally use ultrasonic cleaning to clean the aluminum plate, the particle size of lead powder is 5, 8, 10μm, and the density is 5.65g / cm 3 According to the aforementioned formula, the slot widths of 0.37mm, 0.58mm, 0.79mm, and 1.03mm correspond to lead contents of 12%, 18%, 24%, and 30%, respectively.

[0043] Use a key to evenly fill the groove with lead powder. The needleless stirring head is made of 45 steel, and the set rotation sp...

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Abstract

The invention discloses an Al-Pb alloy wear resistant layer preparation method based on friction stir processing, comprising the steps of: forming a straight slot in the surface of an aluminum plate,filling lead powder in the straight slot; pressing the end face of the stirring head into the surface of the aluminum plate base body with a little of depth by using a needle-free stirring head, , sealing the opening of the straight slot filled with lead powder with a rotating action of the stirring head, so as to prevent phenomenon of lead liquefying and the overflow when the needle stirring headis directly used for stirring; forming an Al-Pb alloy wear resistant layer on the surface of the aluminum plate by adopting the needle stirring head for stirring and friction stir processing. According to the Al-Pb alloy wear resistant layer preparation method based on friction stir processing, with the friction stir processing, pure aluminum becomes to have thermoplasticity by rapid rotation ofthe stirring head a stirring head , and lead particles are liquefied and sufficiently stirred into a pure aluminum matrix; the cooled lead is embedded within the aluminum matrix with larger sized particles, a minor amount of "Pb wrapping Si" microstructures that improves the abrasive resistance of aluminum lead alloy are formed, so that the segregation problem caused by large specific gravity difference of the aluminum lead is improved to a certain extent, the material can be used for bearing bush of automobile.

Description

technical field [0001] The invention belongs to the technical field of surface modification of aluminum alloy plates, and more specifically relates to a method for preparing an Al-Pb alloy wear-resistant layer based on friction stir processing. Background technique [0002] Al-Pb alloy is a new type of bearing material. Pb in the alloy has a good lubricating effect as a self-lubricating soft phase in the alloy. Compared with Cu-Pb alloy and tin-based bus alloy, it is cheaper and has better performance. It has excellent wear resistance and has been widely used in small and medium-sized vans. [0003] Since there is a liquid immiscible zone in Al-Pb alloys, and the density difference between Al and Pb is large, non-uniform and severely segregated Al-Pb alloys are often obtained by conventional methods. Solidified Al-Pb alloys of different shapes and weights can be obtained by rapid solidification, but this technology requires a sufficiently high cooling rate and the productio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B23K20/12B23K20/26B23K20/24
CPCB23K20/12B23K20/24B23K20/26
Inventor 刘坡杨莉熊义峰郭国林戴军张尧成许峰孟涛
Owner CHANGSHU INSTITUTE OF TECHNOLOGY
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