Low-plasticity scandium-aluminum alloy piston material proportioning and smelting technology

A technology of scandium aluminum alloy and low plasticity, which is applied in the proportioning and smelting process of making aluminum alloy piston materials, which can solve the problems of insufficient wear resistance and poor heat resistance, and achieve the effect of improving the tensile strength

Inactive Publication Date: 2010-02-03
江苏万里活塞轴瓦有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly aims at the insufficient wear resistance and poor heat resistance of the aluminum alloy piston material in the prior art, and proposes a modified piston with high tensile strength, good heat resistance and strong wear resistance by adding rare earth elements. Low-plasticity scandium-aluminum alloy piston material with excellent casting performance, the proportion of the material is reasonable, and the melting process is simple

Method used

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  • Low-plasticity scandium-aluminum alloy piston material proportioning and smelting technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] 1000kg of charge is prepared according to the ratio of low-plasticity scandium-aluminum alloy piston materials, and the ratio is percentage by weight. Take 1kgMg, 15kgCu, 95kgSi, 3kgFe, 2kgMn, 1kgNi, 1kgZn and 0.5kgSc respectively, and take 881.5kgAL. Then mix Cu, Mg, Fe, Si, Mn, and Al and store them separately as component A. Then mix Ni and Zn and store them separately as component B. Store Sc separately as component C. When smelting, first put component A into the reverberatory furnace to melt, the furnace temperature is 845±5°C, then put component B into the solution of component A, stir for 18 minutes, then put component C into component A+B solution, stirring was continued for 8 minutes. Finally, transfer the scandium-aluminum alloy solution into a crucible resistance furnace for heat preservation at 820±5°C for 15 minutes.

Embodiment 2

[0026] According to the ratio of low-plasticity scandium-aluminum alloy piston material, 1000kg of charge is prepared, and the ratio is percentage by weight. Take 2kgMg, 25kgCu, 97.5kgSi, 5.5kgFe, 3kgMn, 2kgNi, 2kgZn and 0.75kgSc respectively, and take 862.25kgAL. The grouping mixing is the same as in Example 1 and stored separately. When smelting, first put component A into the reverberatory furnace to melt, the furnace temperature is 850±5°C, then put component B into the solution of component A, stir for 20 minutes, then put component C into component A+B solution, stirring was continued for 10 minutes. Finally, transfer the scandium-aluminum alloy solution into a crucible resistance furnace for heat preservation at 820±5°C, and the heat preservation time is 22 minutes.

Embodiment 3

[0028] According to the ratio of low-plasticity scandium-aluminum alloy piston material, 1000kg of charge is prepared, and the ratio is percentage by weight. Take 3kgMg, 35kgCu, 100kgSi, 8kgFe, 4kgMn, 3kgNi, 3kgZn and 1kgSc respectively, and take 843kgAL. The grouping mixing is the same as in Example 1 and stored separately. When smelting, first put component A into the reverberatory furnace to melt, the furnace temperature is 855±5°C, then put component B into the solution of component A, stir for 22 minutes, then put component C into component A+B solution, stirring was continued for 12 minutes. Finally, transfer the scandium-aluminum alloy solution into a crucible resistance furnace for 820±5°C heat preservation, and the heat preservation time is 30 minutes.

[0029] It is verified by the above three examples that, within the proportioning range, as the content of Sc increases, its performance also increases synchronously. Because Sc is expensive, the amount of Sc should ...

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Abstract

The invention discloses a low-plasticity scandium-aluminum alloy piston material proportioning and smelting technology. A low-plasticity scandium-aluminum alloy piston material is prepared by the materials in percentage by weight: 0.1-0.3 Mg, 1.5-3.5 Cu, 9.5-10 Si, 0.3-0.8 Fe, 0.2-0.4 Mn, 0.1-0.3 Ni, 0.1-0.3 Zn, 0.05-0.1 Sc and the balance of Al. The technology comprises the following steps: before smelting, mixing Cu, Mg, Fe, Si, Mn and Al into a component A, mixing the Ni and the Zn into a component B, and designating the Sc as a component C; firstly, adding the component A to a reaction furnace at a furnace temperature of 850+ / -10 DEG C for smelting; sequentially adding the component B and stirring for 20+ / -2 minutes; then, adding the component C and continuously stirring for 10+ / -2 minutes; then, transferring a scandium-aluminum alloy solution to a crucible resistance furnace 820+ / -5 DEG C and keeping the temperature for 15-30 minutes; and finally, casting and forming at 760+ / -10 DEG C. The Sc doped at a rear smelting period has strong dispersivity to aluminum, stimulates the thinning of crystal grains, remarkably improves the mechanical performance of an aluminum alloy pistonand satisfies the mating requirements of a high-speed internal-combustion engine piston.

Description

technical field [0001] The invention relates to a proportioning and smelting process for making aluminum alloy piston materials, in particular to a proportioning and smelting process for aluminum alloy piston materials containing scandium element. Background technique [0002] The reciprocating piston and cylinder liner in an internal combustion engine are a pair of friction pairs. The piston must not only have sufficient tensile strength to meet the requirements of power transmission in a high temperature environment, but also have strong wear resistance and thermal stability. Once the piston is worn out, the working state of the internal combustion engine will inevitably deteriorate, such as the output power decreases and the exhaust gas exceeds the standard. emissions etc. With the development of the manufacturing industry, the internal combustion engine has developed towards high speed, and the traditional aluminum-silicon alloy and aluminum-zinc alloy used to make pist...

Claims

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Application Information

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IPC IPC(8): C22C21/02C22C1/02
Inventor 黄光华
Owner 江苏万里活塞轴瓦有限公司
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