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Abrasion resistant, heat resistant high silicone aluminium alloy and its shaping technology

A high-silicon aluminum alloy and forming process technology, applied in the field of metamorphic aluminum-based alloys, can solve problems such as high cost, high manufacturing cost, and limited silicon addition, and achieve good wear resistance, heat resistance, and comprehensive mechanical properties Improve and solve the effect of high cost

Inactive Publication Date: 2007-05-23
SHENYANG POLYTECHNIC UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the coarse primary silicon phase of the hypereutectic Al-Si alloy prepared by the traditional ingot metallurgy process limits its application. Although the method of refining primary silicon is used, the refinement of the cast crystal The effect is very limited, and the addition of silicon is limited by this method, and it is difficult to improve the wear resistance of the alloy.
[0003] The emergence and development of rapid solidification technology can partially solve the contradiction between the amount of silicon added and the coarseness of the primary silicon phase, but the complex process and high manufacturing cost of rapid solidification technology limit its practical application, especially in the civilian field application in
In addition, the aluminum alloy with fine grain and high volume fraction of the second phase silicon can also be obtained by the composite material manufacturing process, but the composite technology also has complex process, high cost, uneven distribution of the second phase and phase interface. Problems such as bad combination

Method used

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  • Abrasion resistant, heat resistant high silicone aluminium alloy and its shaping technology

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] According to the following chemical composition (wt%): Si 17; Fe 5; Mn 3; Ni 2 preparation master alloy, the composition of master alloy is Si35Al65; Fe15Al85; The remaining aluminum is added into the electric furnace together. It is heated and melted by electricity, and solidified into ingots under the condition of electromagnetic stirring after refining and metamorphism.

[0017] The ingot is machined to make its size meet the requirements of the extrusion die, that is, it is made into a billet.

[0018] The processed billet is reheated, and the heating temperature is determined according to the alloy composition. When the liquid phase component in the billet reaches 40Vol%, put the semi-solid billet into the extrusion die, set the working parameters of the extruder according to the specifications of the parts, and extrude in the die. After solid solution and aging treatment, the required parts are made.

[0019] At this time, the mechanical properties of the alloy...

Embodiment 2

[0022] According to the following chemical composition (wt%): Si 15; Fe 5; Mn 1; Ni 3 and an appropriate amount of Al to prepare a master alloy, and then add Cu 4, Mg 0.5 and the rest of Al into a vacuum electric furnace, heat and melt , Melting temperature 800 ℃, heat preservation 30 minutes. Pouring into ingots under electromagnetic stirring conditions. The cast ingot is then machined to make a billet.

[0023] Carry out secondary heating to the billet, the heating temperature is 560°C, when the liquid phase component in the billet reaches 20Vol%, put it into the extrusion die, set the working parameters of the extruder according to the specifications of the parts, and extrude in the die Compression molding, and then solution and aging treatment to finally make the required parts.

Embodiment 3

[0025] According to the following chemical composition (wt%): Si 20; Fe 2; Mn 2; Ni 1 and an appropriate amount of Al to prepare a master alloy, put it into the crucible of a vacuum electric furnace together with Cu1, Mg 1.5 and the rest of Al, and heat and melt it , the melt temperature was 800°C, and the temperature was kept for 30 minutes. Cast into ingots under electromagnetic stirring. The ingot is machined into an extruded billet.

[0026] Carry out secondary heating to the billet, the heating temperature is 560°C, when the liquid phase component in the billet reaches 30Vol%, put it into the extrusion die, set the working parameters of the extruder according to the specifications of the parts, and in the die Extrusion molding, and then heat treatment according to the same specifications as the previous embodiment to finally make the required parts.

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Abstract

An antiwear refractory high-Si Al-alloy contains proportionally Si, Fe, Mn, Cu, Mg, Ni and Al. Its shaping process includes such steps as smelting and semi-solid die pressing for breaking and fining Si phase and other intermetallic compound phases.

Description

technical field [0001] The invention belongs to the technical field of modified aluminum-based alloys, in particular to a process for changing the physical structure of aluminum-based alloys through thermal processing. Background technique [0002] It has been the goal pursued by material researchers for many years to replace traditional automobile engine, compressor cast iron and steel castings with low-density, high wear-resistant hypereutectic aluminum-silicon alloy parts. Because of its low thermal expansion coefficient, low density, good thermal conductivity, wear resistance, and corrosion resistance, hypereutectic aluminum-silicon alloy is especially suitable for manufacturing lightweight wear-resistant parts, so it is widely used in aviation, aerospace, transportation, and mechanical processing. And other fields, especially in the automotive industry have been widely used. However, the coarse primary silicon phase of the hypereutectic Al-Si alloy prepared by the trad...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C21/02C22F1/043
Inventor 袁晓光赵树国黄宏军
Owner SHENYANG POLYTECHNIC UNIV