High-temperature wear-resistance high-strength aluminum alloy composite material for piston and preparation method thereof
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A high-temperature wear-resistant, composite material technology, used in pistons, mechanical equipment, engine components, etc., can solve the problems of insufficient strength and easy cracking of the piston head, and achieve good wettability, low production cost, and good thermal stability. Effect
Inactive Publication Date: 2017-05-31
镇江创智特种合金科技发展有限公司
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Problems solved by technology
The invention solves the problem that the piston head is not strong enough and easy to crack under high temperature conditions
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Embodiment approach 1
[0020] The high-temperature wear-resistant high-strength piston aluminum alloy composite material of the present invention is prepared according to the following steps:
[0021] (1) Take raw materials by mass percentage, industrial crystalline silicon 12%, nickel 4.0%, copper 3.0%, magnesium 1.0%, titanium 1.0%, the rest is aluminum;
[0022] (2) Powder mixing, ball milling at 300r / min (Al+B 2 o 3 ) powder, the particle size is 100 mesh, the volume fraction (vol.%) is 5%, and the ball-milled powder is preheated at 200°C for 3h;
[0023] (3) Melting industrial pure aluminum, crystalline silicon, copper, nickel, magnesium and titanium at 800°C in a melting furnace to prepare an aluminum alloy matrix;
[0024] (4) Cool the base material to a semi-solid range of 580°C at 20°C / min, and slowly add (Al+B 2 o 3 ) powder, heat up to 900°C at 40°C / min and keep warm for 1h;
[0025] (5) High-pressure low-speed metal mold casting or squeeze casting is used to cast the piston blank, a...
Embodiment approach 2
[0029] The high-temperature wear-resistant high-strength piston aluminum alloy composite material of the present invention is prepared according to the following steps:
[0030] (1) Take raw materials by mass percentage, 13% of industrial crystalline silicon, 3.0% of nickel, 4.0% of copper, 2.0% of magnesium, 1.0% of titanium, and the rest are aluminum;
[0031] (2) Powder mixing, ball milling at 300r / min (Al+B 2 o 3 ) powder, the particle size is 500 mesh, the volume fraction (vol.%) is 3%, and the ball-milled powder is preheated at 200°C for 3h;
[0032] (3) Melting industrial pure aluminum, crystalline silicon, copper, nickel, magnesium and titanium at 760°C in a melting furnace to prepare an aluminum alloy matrix;
[0033] (4) Cool the base material to a semi-solid range of 60°C at 20°C / min, and slowly add (Al+B 2 o 3 ) powder, heat up to 900°C at 40°C / min and keep warm for 1h;
[0034] (5) High-pressure low-speed metal mold casting or squeeze casting is used to cast ...
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Abstract
The invention belongs to the field of metal materials and relates to a high-temperature wear-resistance high-strength aluminum alloy composite material for a piston and a preparation method thereof. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, the problem that a piston head is easy to crack due to the fact that the strength is insufficient under a high-temperature working condition. The material composed of a substrate and reinforcing phases; the substrate alloy comprises, by weight, 11.0-16.0% of silicon, 3.0-5.0% of nikel, 2.0-4.0% of cooper, 0.5-2.0% of magnesium, 0.5-1.5% titanium and the balance aluminum; and the reinforcing phases are Al2O3 particles generated through an in-situ reaction. The preparation method of the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston comprises the following steps that raw materials are weighed by mass percentage; industry pure aluminum, crystalline-silicon, copper, nickel, magnesium and titanium are smelted at the temperature of 750-900 DEG C; the materials are cooled down to 540-600 DEG C at the speed of 20 DEG C/min, and (Al and B2O3) powder with the temperature being 200 DEG C is slowly added, ball-milled and preheated ; a piston blank is formed through high-pressure low-speed metal mold casting or squeezing casting; and the poured blank is subjected to T6 heat treatment. According to the high-temperature wear-resistance high-strength aluminum alloy composite material for the piston and the preparation method thereof, at the normal temperature and under normal pressure, production can be conducted through common aluminum alloy smelting equipment.
Description
technical field [0001] The invention belongs to the field of metal materials, and relates to a high-temperature wear-resistant high-strength in-situ Al 2 o 3 Particle reinforced aluminum alloy composite material and its preparation method. Background technique [0002] As the "heart" of the automobile engine, the piston is mainly affected by the alternating mechanical load and thermal load. The overall different working conditions of the parts, especially the working environment at the top of 300°C~400°C, have new development needs for the design of the piston material and the casting process. Al-Si series alloy is a kind of alloy that can be strengthened by heat treatment. It has low density, light weight, good thermal conductivity, small thermal expansion coefficient, and has sufficient high temperature strength, wear resistance and corrosion resistance, and good dimensional stability. , Al-12Si alloy mainly refers to the Al-Si alloy with a Si content of 11%~13%, which ...
Claims
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