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Al-Si alloy piston
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A technology of aluminum-silicon alloy and silicon-aluminum alloy, which is applied in the field of engines, can solve problems such as poor dimensional stability of pistons, inability to meet the requirements of high-speed and lightweight engines, and engine malfunctions, etc.
Inactive Publication Date: 2017-04-19
WUXI MINGSHENG STRONG BLOWER
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However, the fatal problems of these two types of alloys in practical applications are poor dimensional stability of the piston, poor load resistance against seizure, and irreversible volume expansion at high temperature, which leads to the occurrence of "cylinder seizure" and makes the engine unable to work normally.
Due to the above-mentioned inevitable defects in performance, the application of hypoeutectic and eutectic Al-Si alloys as piston materials has been increasingly unable to meet the requirements of modern engines for high speed and light weight.
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Embodiment 1
[0018] A silicon aluminum alloy piston, the silicon aluminum alloy piston adopts hypereutectic silicon aluminum alloy, wherein Si 22%, Cu 0.5%, Mg 1.2%, Mn 0.2%, Ti 0.2%, Zn 0.15% by mass percentage, Al balance.
[0019] After testing, the strength at room temperature reaches above 240MPa, the high temperature strength at 300°C reaches above 160MPa, and the hardness reaches 140-150HBS, which can meet the requirements of the piston.
Embodiment 2
[0021] A silicon-aluminum alloy piston, the silicon-aluminum alloy piston adopts a hypereutectic silicon-aluminum alloy, wherein Si 23.5%, Cu 2.5%, Mg 0.5%, Mn 0.4%, Ti 0.4%, Zn 0.25% by mass percentage, Al balance.
[0022] After testing, the strength at room temperature reaches above 240MPa, the high temperature strength at 300°C reaches above 160MPa, and the hardness reaches 140-150HBS, which can meet the requirements of the piston.
Embodiment 3
[0024] A silicon-aluminum alloy piston, the silicon-aluminum alloy piston adopts a hypereutectic silicon-aluminum alloy, wherein Si 26%, Cu 2.5%, Mg 1.2%, Mn 0.6%, Ti 0.4%, Zn 0.25% by mass percentage, Al balance.
[0025] After testing, the strength at room temperature reaches above 240MPa, the high temperature strength at 300°C reaches above 160MPa, and the hardness reaches 140-150HBS, which can meet the requirements of the piston.
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Abstract
The invention discloses an Al-Si alloypiston. A hypereutectic Al-Si alloy is adopted for the Al-Si alloypiston, and comprises the following components in percentage by mass: 22-26% of Si, 0.5-2.5% of Cu, 0.3-1.2% of Mg, 0.2-0.6% of Mn, 0.2-0.4% of Ti, 0.15-0.25% of Zn and the balance of Al. By adoption of the Al-Si alloy piston disclosed by the invention, the defects that a conventional Si-Al alloy piston is low in size stability and anti-seizure load capacity, and the volume is subjected to irreversible expansion at high temperature can be overcome.
Description
technical field [0001] The invention relates to the technical field of engines, in particular to an aluminum-silicon alloy piston. Background technique [0002] An important measure to reduce the weight of parts and components is to replace steel with aluminum. Aluminum alloy has the characteristics of light specific gravity, easy forming, high specific strength, and good corrosion resistance. As a light metal, it is widely used in auto parts. The Al-Si alloy with Si as the main element and supplementary addition of Cu, Mg and other elements not only has a lighter specific gravity than traditional aluminum alloys, but also has good high-temperature strength, wear resistance, heat resistance and low thermal expansion coefficient. It is an ideal material to replace iron-based materials to prepare engine pistons, and its application prospects are very broad. [0003] Hypoeutectic and eutectic Al-Si alloys overcome the disadvantages of large thermal expansion coefficient and h...
Claims
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