High strength heat-resisting hypereutectic aluminium-silicon alloy and preparation method thereof

An aluminum-silicon alloy and hypereutectic technology, which is applied in the field of metallurgy, can solve the problems of poor heat resistance and low tensile strength, and achieve the effects of improving heat resistance, low cost and simple process

Inactive Publication Date: 2009-10-21
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003]Aiming at the above technical problems, the present invention provides a high-strength heat-resistant hypereutectic aluminum-silicon alloy and its preparation method, the purpose of which is to solve the existing hypereutectic aluminum-silicon alloy Poor heat resistance and low tensile strength

Method used

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  • High strength heat-resisting hypereutectic aluminium-silicon alloy and preparation method thereof

Examples

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Effect test

Embodiment 1

[0021] Heat metal aluminum to 720°C to become liquid, add aluminum-silicon alloy, aluminum-copper alloy, aluminum-nickel alloy, aluminum-chromium alloy, aluminum-iron alloy, aluminum-manganese alloy, aluminum-zirconium alloy, aluminum rare-earth alloy, aluminum-molybdenum alloy, of which rare earth components account for 10% of the weight of the aluminum rare earth alloy, the rare earth composition is 56% by weight of cerium, 24% of lanthanum, 4% of praseodymium, and 16% of niobium; heat preservation at 720°C until all metals are melted into a liquid state, the first time Add aluminum refining agent, keep warm at 720°C for 15 minutes, then skim the slag, press the metal magnesium wrapped in aluminum foil into the metal molten pool with a metal cover, stir until the metal magnesium is completely melted, and keep warm at 720°C for 15 minutes; Add the modifier copper-phosphorus alloy into the pool, stir until the modifier is completely melted, and keep warm at 720°C for 40 minutes...

Embodiment 2

[0031]Heat metal aluminum to 820°C to become liquid, add aluminum-silicon alloy, aluminum-copper alloy, aluminum-nickel alloy, aluminum-chromium alloy, aluminum-iron alloy, aluminum-manganese alloy, aluminum-molybdenum alloy, and keep warm at 820°C until all the metal melts into a liquid state , add aluminum refining agent for the first time, keep warm at 820°C for 10 minutes, then skim the slag, press the metal magnesium wrapped in aluminum foil into the metal molten pool with a metal cover, stir until the metal magnesium is completely melted, and keep warm at 750°C 10 minutes; add the modifier copper-phosphorus alloy into the molten pool, stir until the modifier is completely melted, and keep warm at 750°C for 35 minutes. Add the aluminum refining agent for the second time, keep the temperature at 750°C for 15 minutes, then skim off the slag, and then let it stand for 9 minutes. Among them, the composition of the modifier copper-phosphorus alloy is 8% phosphorus by weight pe...

Embodiment 3

[0035] Heat metal aluminum to 780°C to become liquid, add silicon, copper, nickel, iron, manganese, zirconium, chromium and molybdenum, add aluminum rare earth alloy, and then add metal aluminum to cover the above metal or alloy, wherein the aluminum rare earth alloy contains The rare earth composition accounts for 10% of the weight of the aluminum rare earth alloy, and the rare earth composition is 56% by weight of cerium, 24% of lanthanum, 4% of praseodymium, and 16% of niobium; it is kept at 780°C until all the metals are melted into a liquid state , add aluminum refining agent for the first time, keep warm at 780°C for 5 minutes, then skim off the slag, press the metal magnesium wrapped in aluminum foil into the metal molten pool with a metal cover, stir until the metal magnesium is completely melted, and keep warm at 780°C 5min; add the modifier copper-phosphorus alloy into the molten pool, stir until the modifier is completely melted, and keep warm at 780°C for 30min. Ad...

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Abstract

The invention relates to a high strength heat-resisting hypereutectic aluminium-silicon alloy, belonging to the field of metallurgical technology. The hypereutectic aluminium-silicon alloy comprises the components according to the weight percentage: 17.0-19.0% of silicon, 1.0-2.0% of copper, 0.3-0.7% of magnesium, 0.5-1.0% of nickel, 0.5-1.0% of ferrum, 0.3-0.7% of manganese, 0-0.4% of zirconium, 0-0.28% of cerium, 0-0.12% of lanthanum, 0-0.02% of praseodymium, 0-0.08% of niobium, 0.5-1.0% of chromium, 0.3-0.7% of molybdenum, 0.07-0.15% of phosphorus, less than 0.5% of impurities and rest of aluminum. A method for preparing the high strength heat-resisting hypereutectic aluminium-silicon alloy comprises: the aluminium is heated to be melted, and then added with other metals to be melted; the melted mixture is added with alterative and refining agent for refining or blown with argon for refining; then, the obtained product is processed by pouring and heat treatment. The method has simple technique and low cost; the hypereutectic aluminium-silicon alloy prepared by the method has higher temperature mechanical property compared with the existing hypereutectic aluminium-silicon piston alloy with other trademarks at home and abroad.

Description

technical field [0001] The invention belongs to the technical field of metallurgy, in particular to a high-strength heat-resistant hypereutectic aluminum-silicon alloy and a preparation method thereof. Background technique [0002] Hypereutectic aluminum-silicon alloy has excellent low expansion performance, high wear resistance and corrosion resistance, low density and good thermal conductivity, and is an ideal material for manufacturing engine pistons. At present, it is found that the high-temperature strength of this type of alloy is low during use, resulting in low service temperature, which has become a restrictive factor for the use of Al-Si piston alloys in high-power internal combustion engines (piston operating temperatures above 300 ° C). To improve the high-temperature strength and toughness of hypereutectic Al-Si alloys, in addition to refining and spheroidizing eutectic Si and primary Si, it is also necessary to obtain a dispersed second phase with high temperat...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/06C22C1/10C22F1/043
Inventor 李润霞袁晓光曲迎东陈玉金李荣德
Owner SHENYANG POLYTECHNIC UNIV
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