Dy containing aluminum alloy for vacuum pump rotor and preparing method of Dy containing aluminum alloy

Abstract

The invention relates to a Dy containing aluminum alloy for a vacuum pump rotor and a preparing method of the Dy containing aluminum alloy, and belongs to the technical field of alloy materials. To solve the problem that in the prior art, the low expansion coefficient and the high tensile strength performance cannot be combined at the same time, the Dy containing aluminum alloy for the vacuum pump rotor and the preparing method of the Dy containing aluminum alloy are provided. The aluminum alloy comprises, by mass percent, 25wt%-30wt% of Si, 0.6wt%-2.3w% of Cu, 0.4wt%-0.6wt% of Mn, 2.2wt%-3.0wt% of Ag, 1.2wt%-1.7wt% of Dy, 1.0wt%-1.5wt% of Ni and the balance Al. According to the above raw materials, after the raw materials are selected and melted, overheat treatment is conducted, casting is conducted, and a cast-state aluminum alloy is obtained; and finally, after heat treatment and solid solution treatment are conducted, ageing treatment is conducted after cooling. The Dy containing aluminum alloy has the effects of the high tensile strength and the low expansion coefficient.

Description

technical field [0001] The invention relates to a Dy-containing aluminum alloy for a vacuum pump rotor and a preparation method thereof, belonging to the technical field of alloy materials. Background technique [0002] Roots vacuum pumps are widely used in smelting, degassing and rolling in vacuum metallurgy, as well as in vacuum distillation, vacuum concentration and vacuum drying in chemical, food and pharmaceutical industries. Vacuum pump accessories are vacuum pump silencers for vacuum pump noise control. The development of larger and more advanced vacuum pumps represents an important development direction of the industry. However, most of the current vacuum pump rotors are made of cast iron, and the density is too high (the density of cast iron is 7.86g / cm 3 ), the large-sized cast iron rotor will seriously hinder the operation stability of the vacuum pump due to its excessive weight, and consume more energy, thereby seriously hindering the development of new vacuum ...

AI Technical Summary

Problems solved by technology

However, due to the higher silicon content, the castability of Al-Si alloy is poorer and the tensile strength of the alloy is lower

For example, a Chinese patent application (publication number: CN102965551A) discloses a hypereutectic aluminum-silicon alloy and its preparation method. The weight percent composition of the hypereutectic aluminum-silicon alloy is: silicon 16.0%-19.0%, copper 3.0%-4.0% %, magnesium 0.40%~0.70%, nickel 1.0%~2.0%, rare earth Re 0.40%~1.2%, phosphorus 0.001%~0.006%, Fe<0.40%, the sum of other impurities<0.50%, the balance is aluminum, which is added AlCuP and AlRE are only used as modifiers to achieve the effect of refining primary silicon and eutectic silicon, while other elements form corresponding strengthening phases to improve the strength of the alloy, which is not conducive to making the aluminum alloy at the same time It has low expansion coefficient and high heat resistance. At the same time, due to the high activity of Ce in its rare earth, it is not conducive to actual operation in actual use.