Rare earth-containing aluminum alloy for vacuum pump rotor and preparation method thereof

An aluminum alloy and vacuum pump technology, applied in the field of alloy materials, can solve the problems of high temperature resistance, unfavorable tensile strength and high activity, achieve high tensile strength and low expansion coefficient, improve performance, good tensile strength and The effect of a low coefficient of expansion

Active Publication Date: 2018-02-16
江苏至臻环保科技集团有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Through the compound modification treatment of RE and P, it realizes the simultaneous refinement of hypereutectic aluminum alloy primary silicon and eutectic silicon, and realizes hypereutectic aluminum alloy and high-temperature mechanical properties, but its overall high-temperature resistance The tensile strength needs to be improved; and the activity of Ce is high, which is not conducive to the actual operation in actual use.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The rare earth-containing aluminum alloy for the vacuum pump rotor of this embodiment includes the mass percentage of the following components:

[0032] Si: 23wt%; Cu: 0.8wt%; Mn: 0.2wt%; Ag: 3.0wt%; Y: 0.7wt%; Dy: 1.5wt%;

[0033] The specific preparation method of the above vacuum pump rotor with rare earth-containing aluminum alloy is as follows:

[0034] Select materials according to the mass ratio of the following raw materials, preheat pure aluminum, pure Si, pure copper, pure silver, pure Ni, Al-Dy master alloy, Al-Y master alloy, Al-Mn master alloy, preheat The temperature is 130°C ~ 150°C. After preheating, the pure silicon is broken into small pieces of about 10mm, and then wrapped with aluminum foil and preheated at about 200°C;

[0035] Then, put the preheated pure aluminum ingot into the smelting furnace, and then continue to raise the temperature. When the furnace temperature reaches 760°C, keep it warm until the metal is in a molten state; Then add it t...

Embodiment 2

[0039] The rare earth-containing aluminum alloy for the vacuum pump rotor of this embodiment includes the mass percentage of the following components:

[0040] Si: 25wt%; Cu: 1.2wt%; Mn: 0.8wt%; Ag: 2.5wt%; Y: 1.0wt%; Dy: 0.5wt%;

[0041] The specific preparation method of the above-mentioned rare earth-containing aluminum alloy for the vacuum pump rotor is the same as that of Embodiment 1, and will not be repeated here.

[0042] The properties of the obtained aluminum alloy were tested, that is, the tensile strength of the hypereutectic aluminum-silicon alloy test rod in the room temperature T6 state and the thermal expansion coefficient at 20°C-300°C were tested respectively, and the room temperature tensile strength (σ b ) is 295MPa; 300℃ tensile strength (σ b ) is 190MPa; the coefficient of thermal expansion at 20°C-300°C is 15.7×10 -6 K -1 .

Embodiment 3

[0044] The rare earth-containing aluminum alloy for the vacuum pump rotor of this embodiment includes the mass percentage of the following components:

[0045] Si: 26wt%; Cu: 2.4wt%; Mn: 0.5wt%; Ag: 3.0wt%; Y: 1.2wt%; Dy: 1.0wt%;

[0046] The specific preparation method of the above-mentioned rare earth-containing aluminum alloy for the vacuum pump rotor is the same as that of Embodiment 1, and will not be repeated here.

[0047] The properties of the obtained aluminum alloy were tested, that is, the tensile strength of the hypereutectic aluminum-silicon alloy test rod in the room temperature T6 state and the thermal expansion coefficient at 20°C-300°C were tested respectively, and the room temperature tensile strength (σ b ) is 294MPa; 300°C tensile strength (σ b ) is 189MPa; the coefficient of thermal expansion at 20°C-300°C is 16.1×10 -6 K -1 .

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Abstract

The invention relates to a rare-earth-containing aluminum alloy for a rotor of a vacuum pump and a preparation method thereof, belongs to the technical field of alloy materials, and particularly provides a Dy-containing aluminum alloy for the rotor of a vacuum pump and a preparation method thereof to solve existing problems that low expansion coefficient and high tensile strength cannot be achieved at the same time. The aluminum alloy is prepared from the following components in percentage by mass: 23-26 percent of Si, 0.8-2.4 percent of Cu, 0.2-0.8 percent of Mn, 2.0-3.0 percent of Ag, 0.7-1.5 percent of Y, 0.5-1.5 percent of Dy, 1.1-1.4 percent of Ni and the balance of Al. The preparation method comprises the following steps: melting raw materials according to the proportion of the raw materials; heating and casting to obtain as-casting aluminum alloy; and heating, solutionizing, cooling and performing aging treatment. The rare-earth-containing aluminum alloy has the effects of high tensile strength and low expansion coefficient.

Description

technical field [0001] The invention relates to a rare earth-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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22C1/03C22F1/043
CPCC22C1/026C22C1/03C22C21/02C22F1/043
Inventor 李克杰
Owner 江苏至臻环保科技集团有限公司
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