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Novel damping wear-resisting hypereutectic aluminum-silicon alloy preparing method based on rare earth cerium modification

A technology of aluminum-silicon alloy and rare earth cerium, which is applied in the field of preparation of new friction-reducing and wear-resistant hypereutectic aluminum-silicon alloy, can solve the problems of reducing the wear resistance of the alloy and failing to meet the friction and wear performance of the alloy, and achieve enhanced wear resistance Effect

Inactive Publication Date: 2017-02-08
LANZHOU UNIVERSITY OF TECHNOLOGY
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  • Claims
  • Application Information

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Problems solved by technology

However, with the regularization of the Si phase morphology, the refinement of the size, and the uniformity of the distribution in the hypereutectic Al-Si alloy, although it is beneficial to optimize the friction environment of the alloy, the fine Si phase is distributed on the alloy matrix, which reduces the alloy's frictional environment. Wear resistance, still can not meet the requirements of the friction and wear performance of the alloy piston parts in service

Method used

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  • Novel damping wear-resisting hypereutectic aluminum-silicon alloy preparing method based on rare earth cerium modification

Examples

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preparation example Construction

[0021] Such as figure 1 As shown, the method for preparing a novel friction-reducing and wear-resistant hypereutectic aluminum-silicon alloy based on the modification of rare earth cerium provided by the embodiment of the present invention, the specific steps include:

[0022] S101: Raw material preparation: Prepare the required industrial pure aluminum, industrial crystalline silicon, pure copper and pure bismuth according to the composition requirements;

[0023] S102: Filler melting: put industrial pure aluminum and industrial crystalline silicon in a Si-C rod heating furnace and heat to 780°C~800°C, then add alloying materials copper and bismuth, and stir every 5 minutes until they are completely melted Insulate at 740°C~760°C for 10 minutes;

[0024] S103: Refining pouring: cool down the melt of S102, when the temperature of the melt drops to 700°C~750°C, put C 2 Cl 6 Wrap it with aluminum foil and press it into the alloy melt to stir and refine, remove impurities and ...

Embodiment 1

[0031] (1) Add aluminum ingots and industrial crystalline silicon into a Si-C rod crucible furnace with a furnace temperature of 780°C~800°C. After they are completely melted, add pure copper and pure bismuth, stir every 5 minutes, and 740°C~760°C for 10 minutes; (2) When the melt temperature drops to 700°C~750°C, put the aluminum foil wrapped C 2 Cl 6 Press into the melt to stir and refine, remove impurities and slag; (3) When the temperature of the melt drops to 710°C~720°C, pour the melt into a metal mold to solidify and form, and prepare Al-17Si-3Cu-2Bi Master alloy; (4) Melt the master alloy prepared in step (3) in a crucible boiler at 780°C to 800°C, then add rare earth cerium with a mass fraction of 0.2% to the alloy melt, and stir once every 5 minutes, And heat preservation and deterioration at 760°C~780°C for 20min; (5) Repeat the operation process of step (2) and step (3) to prepare a new anti-friction and wear-resistant hypereutectic aluminum-silicon alloy based on...

Embodiment 2

[0033] Repeat the steps (1) (2) (3) in Example 1 to obtain the master alloy of Al-17Si-3Cu-2Bi, and then melt the master alloy in a crucible boiler at 780 ° C ~ 800 ° C, adding a mass fraction of 0.6% Rare earth cerium is modified, adopt the same modification temperature and holding time as step (4) in Example 1, and cast it when the melt temperature drops to 710 ° C ~ 720 ° C, and prepare a new type of anti-friction and wear resistance based on rare earth cerium modification Hypereutectic Al-Si alloy.

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Abstract

The invention discloses a novel damping wear-resisting hypereutectic aluminum-silicon alloy preparing method based on rare earth cerium modification. The method comprises the steps of carrying out raw material preparing, padding melting and refining casting, obtaining an intermediate alloy, adding modification agent rare earth cerium according to the specific mass fraction, and carrying out stirring at a time every interval of 5 min until the intermediate alloy added with the medication agent rare earth cerium is completely molten at the temperature of 760 DEG C to 780 DEG C and is subject to heat preservation for 20 min; carrying out repeated refining casting operation on the a melt obtained after complete melting of the intermediate alloy added with the modification agent rare earth cerium, carrying out casting, and obtaining the rare earth aluminum-silicon alloy. According to the novel damping wear-resisting hypereutectic aluminum-silicon alloy preparing method based on rare earth cerium modification, alloying elements of Cu and Bi are adopted, and are dissolved in the aluminum-silicon alloy melt in a solid manner, in the casting and solidifying process of a metal mold, a second phase of a hard point is formed and distributed on an alloy base body, the effect of second phase reinforcing is achieved, and wear resistance of an alloy material is ensured.

Description

technical field [0001] The invention belongs to the technical field of preparation of a friction-reducing and wear-resistant hypereutectic aluminum-silicon alloy, and relates to a method for preparing a novel friction-reducing and wear-resistant hypereutectic aluminum-silicon alloy under the modification of rare earth cerium. Background technique [0002] Studies have shown that 60% of the fuel of a car is consumed by its own weight. If the weight of the car is reduced by 10%, the fuel consumption of the car can be reduced by 6% to 8%, and the fuel efficiency can be increased by about 5.5%. 2.5 kg CO 2 emissions. The hypereutectic aluminum-silicon alloy, which is an ideal substitute for traditional cast iron, is used in the production of automotive engine pistons, cylinder heads, and other parts due to its good casting properties, low thermal expansion coefficient, and good wear and corrosion resistance. , in order to achieve the purpose of reducing the weight of the car a...

Claims

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Application Information

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IPC IPC(8): C22C21/04C22C1/03C22C1/06
CPCC22C1/026C22C1/03C22C1/06C22C21/04
Inventor 李庆林李进宝李斌强张朝奋兰晔峰
Owner LANZHOU UNIVERSITY OF TECHNOLOGY
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