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Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons

A low-pressure casting, rare earth magnesium technology, used in engine components, machines/engines, pistons, etc., to achieve excellent creep resistance, reduce vibration, and reduce fuel consumption

Active Publication Date: 2010-04-14
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, at present, the low-pressure casting method is used to prepare high-performance magnesium alloy engine pistons, and there are no public reports at home and abroad.

Method used

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  • Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons
  • Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons
  • Low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The alloy composition (percentage by weight) of the magnesium alloy engine piston: 10% Gd, 3% Y, 2% Zn, 0.4% Zr, the impurity element is less than 0.02%, and the rest is Mg.

[0027] The specific steps of the melting process of the alloy are as follows:

[0028] (1) Configure the alloy according to the above ingredients, preheat the pure magnesium and the master alloy used to 200°C in an oven, and keep it warm for 2 hours;

[0029] (2) Mg smelting: Add industrial pure magnesium into the smelting furnace, heat and smelt, and protect it with a covering agent at the same time;

[0030] (3) Add Y and Gd: Add the dried Mg-Y and Mg-Gd master alloys to the magnesium liquid at a temperature of 730°C;

[0031] (4) Adding Zn: After the master alloy is completely melted, add industrial pure zinc at a temperature of 700°C;

[0032] (5) Adding Zr: Raise the temperature of the magnesium liquid to 760°C, then add the Mg-Zr master alloy, stir for 2 minutes to promote its full melting...

Embodiment 2

[0038] The alloy composition (percentage by weight) of the magnesium alloy engine piston: 11% Gd, 2% Y, 1% Zn, 0.2% Zr, the impurity element is less than 0.02%, and the rest is Mg.

[0039] The specific steps of the melting process of the alloy are as follows:

[0040] (1) Configure the alloy according to the above ingredients, preheat the pure magnesium and the master alloy used to 200°C in an oven, and keep it warm for 2 hours;

[0041] (2) Mg smelting: Add industrial pure magnesium into the smelting furnace, heat and smelt, and protect it with a covering agent at the same time;

[0042] (3) Add Y and Gd: Add the dried Mg-Y and Mg-Gd master alloys to the magnesium liquid at a temperature of 730°C;

[0043] (4) Adding Zn: After the master alloy is completely melted, add industrial pure zinc at a temperature of 700°C;

[0044] (5) Adding Zr: Raise the temperature of the magnesium liquid to 760°C, then add the Mg-Zr master alloy, stir for 2 minutes to promote its full melting...

Embodiment 3

[0050] The alloy composition (percentage by weight) of the magnesium alloy engine piston: 12% Gd, 2% Y, 2% Zn, 0.3% Zr, the impurity element is less than 0.02%, and the rest is Mg.

[0051] The specific steps of the melting process of the alloy are as follows:

[0052] (1) Configure the alloy according to the above ingredients, preheat the pure magnesium and the master alloy used to 200°C in an oven, and keep it warm for 2 hours;

[0053] (2) Mg smelting: Add industrial pure magnesium into the smelting furnace, heat and smelt, and protect it with a covering agent at the same time;

[0054] (3) Add Y and Gd: Add the dried Mg-Y and Mg-Gd master alloys to the magnesium liquid at a temperature of 730°C;

[0055] (4) Adding Zn: After the master alloy is completely melted, add industrial pure zinc at a temperature of 700°C;

[0056] (5) Adding Zr: Raise the temperature of the magnesium liquid to 760°C, then add the Mg-Zr master alloy, stir for 2 minutes to promote its full melting...

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Abstract

A low-pressure casting preparation method of heat resistant rare earth-magnesium alloy engine pistons in the field of the automobile manufacturing technology comprises preparing master alloy Mg-Y, Mg-Gd, Mg-Zr, industrial pure magnesium and industrial pure zinc, smelting alloy, obtaining magnesium alloy fused mass, squeezing and casting the magnesium alloy fused mass, obtaining the primary blank of a magnesium alloy piston, and obtaining a heat resistant tare earth-magnesium alloy engine piston through orderly carrying out the solid solution treatment, the cold treatment and the aging treatment. The method can prepare pistons with excellent high-temperature strength, fatigue strength and creep resistance performance through applying 0.2-0.8 atm pressure and selecting proper heat resistant rare earth-magnesium alloy, selecting proper low-pressure casting technical parameter and adjusting corresponding heat processing technology.

Description

technical field [0001] The invention relates to a method in the technical field of automobile manufacturing, in particular to a low-pressure casting preparation method for a heat-resistant rare earth magnesium alloy engine piston. Background technique [0002] The piston is one of the most important parts in the engine, because it works under the conditions of high temperature, high pressure, corrosion, friction, and high-speed movement, the performance requirements of the material are very high. According to the working environment of the piston, the piston material should meet the following conditions: it should have high mechanical strength, especially high temperature strength and thermal stability; Appropriate clearance to reduce noise during mechanical operation and reduce fuel consumption; poor heat absorption and good thermal conductivity, which can transfer heat generated during work in time; large specific strength to reduce piston weight and improve work efficien...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C23/00C22C1/03B22D18/04C22F1/06F02F3/00
Inventor 王渠东尹冬弟陈长江
Owner SHANGHAI JIAO TONG UNIV
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