High-strength casting aluminium-silicon alloy for piston and preparation method thereof

A technology for casting aluminum-silicon alloys and pistons, which is applied to casting aluminum-silicon alloys for engine pistons and its preparation. The alloy is in the field of smelting and heat treatment processes corresponding to its composition range, which can solve the problems of increasing production costs and hindering the promotion of alloys. Application and other issues, to achieve the effect of refining grains, reducing the content of precious elements, and simple process

Inactive Publication Date: 2010-11-03
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the increase of rare elements in the alloy and the complexity of the preparation process have improved the performance of the alloy to a certain extent, it has also led to a substantial increase in production costs, which hinders the promotion and application of such alloys under ordinary industrial production conditions. application

Method used

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  • High-strength casting aluminium-silicon alloy for piston and preparation method thereof
  • High-strength casting aluminium-silicon alloy for piston and preparation method thereof
  • High-strength casting aluminium-silicon alloy for piston and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0044] Embodiment 1: smelting alloy is composed as follows:

[0045] Si: 12.5wt%; Ni: 0.25wt%; Cu: 2.5wt%; Fe: 0.3wt%; Mn: 0.5wt%; Mg: 0.3wt%; Ti: 0.15wt%; Zr: 0.3wt%. Al.

example

[0046] Example alloy number: 3#.

[0047] The alloy preparation steps are as follows: Spread a layer of flux on the bottom of the crucible, then put industrial pure aluminum (purity > 99.0wt%) and intermediate alloys into the crucible in layers, place the ones with low melting point and low density in the lower layer, and put the ones with high melting point and high density Place it on the upper layer; raise the furnace temperature to 780°C, keep warm until the raw materials are in paste form, press the Al-Ti, Al-Zr intermediate alloy into the bottom of the crucible with a bell jar, and then spread flux on the surface of the melt; wait for the raw materials to melt completely Finally, insert a clean Ti rod into the melt and stir gently for 3-5 circles to remove the slag on the surface of the melt; use a bell jar to press AlP into the melt twice for deterioration treatment, and take out the bell jar after it is completely melted. Raise the temperature to 800°C and keep it warm...

Embodiment 2

[0053] Embodiment 2: The smelted alloy is composed of the following components:

[0054] Si: 13.5wt%; Ni: 0.3wt%; Cu: 3.0wt%; Fe: 0.8wt%; Mn: 0.6wt%; Mg: 0.4wt%; Ti: 0.10wt%; Zr: 0.3wt%. Al.

[0055] Example alloy number: 8#.

[0056] The alloy preparation steps are as follows: Spread a layer of flux on the bottom of the crucible, then put industrial pure aluminum (purity > 99.0wt%) and intermediate alloys into the crucible in layers, place the ones with low melting point and low density in the lower layer, and put the ones with high melting point and high density Place it on the upper layer; raise the furnace temperature to 780°C, keep warm until the raw materials are in paste form, press the Al-Ti, Al-Zr intermediate alloy into the bottom of the crucible with a bell jar, and then spread flux on the surface of the melt; wait for the raw materials to melt completely Finally, insert a clean Ti rod into the melt and stir gently for 3-5 circles to remove the slag on the surface...

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Abstract

The invention relates to a casting aluminium-silicon alloy for motor piston and a preparation method thereof, belonging to the field of metal materials. The aluminium-silicon alloy comprises 12.0-14.0 wt% of Si, less than 0.3 wt% of Ni, 1.8-3.0 wt% of Cu, 0.3-0.8 wt% of Fe, 0.3-0.6 wt% of Mn, less than 0.4 wt% of Mg, 0.1-0.2 wt% of Ti, less than 0.3 wt% of Zr and balance of Al. The heat treatment parameters are as follows: 510+ / -5 DEG C*5-8h+water quenching under room temperature for solution treatment; and 160+ / -5 DEG C*6-10h+air cooling for ageing treatment. The tensile strength and yield strength of the alloy under the room temperature reach 283-305MPa and 178-190MPa respectively and the elongtation percentage after breaking reaches 1.8-3.2%. Compared with similar alloys, the aluminium-silicon alloy of the invention has higher mechanical property, reduces Ni element content and noble metal element content of the alloy and allows Fe element to fluctuate in wider scope; the invention has good quality of ingot casting, simple process and strong operability.

Description

technical field [0001] The invention belongs to the field of metal materials, and relates to a cast aluminum-silicon alloy for engine pistons and a preparation method thereof, in particular to a melting and heat treatment process corresponding to the alloy within its composition range. Background technique [0002] Aluminum-silicon series casting alloys have good castability, wear resistance and thermal conductivity, and can maintain high strength and corrosion resistance at high temperatures. These performance characteristics make this series of alloys a common material for making automotive engine pistons. [0003] At present, the domestic gasoline / diesel engine piston production materials are mainly eutectic aluminum-silicon alloys, and the commonly used grades are ZL108 and ZL109. In order to further improve the mechanical properties of such materials and meet the ever-increasing engine power and vehicle emission requirements, people have conducted a lot of exploration a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C21/02C22C1/03B22D1/00B22D21/04C22F1/043
Inventor 惠希东王恩睿王树申王云亮刘胜男陈国良
Owner UNIV OF SCI & TECH BEIJING
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