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Magnesium alloy piston of engine and preparation method

A magnesium alloy and engine technology, applied in the field of magnesium alloy engine piston and its preparation, can solve problems such as not being well developed and utilized, and achieve the effects of high toughness and strength, improved life, and reduced impact

Active Publication Date: 2007-10-10
GRIMAT ENG INST CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, magnesium alloys have not been well developed and utilized in the above-mentioned occasions of light weight and high-speed reciprocating motion

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] According to the alloy composition content of the magnesium alloy engine piston: Al 8%, Si 8%, Be 0.0006% and Y 2.5%, the balance is Mg, and the material is prepared. Among them, Mg is magnesium ingot, Al and Si are Al-Si master alloy.

[0047] 1. Magnesium alloy melting

[0048] Preheat the crucible to 400-500°C, and evenly sprinkle a layer of No. 2 flux on the inner wall and bottom of the crucible. Add magnesium ingot, heat up to melting, when the melt temperature reaches 720-750°C, add Al-Si master alloy according to Al 8%, Si 8%. After complete melting, cast the spectroscopic sample for pre-furnace analysis. If the composition is unqualified, it can be adjusted by adding ingredients until it is qualified.

[0049] Control the temperature to 740~750°C, add C by 0.5% of the weight of the melt 2 Cl 6 Carry out C modification treatment, so that the C content in the melt reaches 0.02% to 0.04%. After the modification treatment, the temperature is adjusted to 710-73...

Embodiment 2

[0057] According to the alloy composition content of the magnesium alloy engine piston: Al 7.5%, Si 7.5%, Ca 2% and Nd 3%, the balance is Mg, and the material is prepared. Among them, magnesium ingot is used for Mg, and Al-Si is used for Al and Si master alloy.

[0058] 1. Magnesium alloy melting

[0059] Preheat the crucible to 400-500°C, and evenly sprinkle a layer of No. 2 flux on the inner wall and bottom of the crucible. Add magnesium ingot, heat up to melting, when the melt temperature reaches 700-720°C, add Al-Si master alloy according to Al 7.5%, Si 7.5%. After complete melting, cast the spectroscopic sample for pre-furnace analysis. If the composition is unqualified, it can be adjusted by adding ingredients until it is qualified.

[0060] Adjust the temperature to 710-730°C for refining. Stir the melt for 10-30 minutes, make the melt roll from bottom to top without splashing, and continuously sprinkle magnesium alloy refining flux on the crest of the melt. The am...

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Abstract

The present invention relates to a magnesium alloy engine piston and its preparation method. Said magnesium alloy composition includes (by wt%) 2-10% of Al, 2-10% of Si and the rest is Mg and additive element. The described additive element is one of Y, Sr, Ca, C, Be and rare earth metal element or several kinds of them in which the additive element Y content is 0-8%, Sr content is 0-5%, Ca content is 0-5%, C content is 0-2%, Be content is 0-0.01%, the described additive rare earth metal is Ce, Nd, Pr, La, Gd, Gy or mixed rare earth metal of these rare earth metals, total content of rare earth metal is 0-6%. Its method includes the following steps: melting magnesium alloy, refining, magnesium alloy semi-solid slurry material preparation, magnesium alloy semi-solid blank material preparation, magnesium alloy ingot preparation, pressure moulding and making magnesium alloy piston.

Description

technical field [0001] The invention relates to a magnesium alloy engine piston and a preparation method thereof. Background technique [0002] Magnesium alloy has very significant advantages in many occasions due to its low density (it is the smallest density among practical structural metals). Especially in terms of light weight, it has irreplaceable advantages. The low density of components can save energy, and it also has the advantage of small inertia in some high-speed motions, especially high-speed reciprocating motions. At present, magnesium alloys have not been well developed and utilized in the above-mentioned occasions of light weight and high-speed reciprocating motion. Contents of the invention [0003] The object of the present invention is to provide a magnesium alloy engine piston that can greatly reduce the impact on the crankshaft and the bearing bush and can greatly reduce the vibration. [0004] Another object of the present invention is to provide a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22D21/04C22C23/00C22C23/02
Inventor 张奎李德富马志新熊柏青
Owner GRIMAT ENG INST CO LTD