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A method for manufacturing a powder metallurgy high-silicon aluminum alloy compressor piston

A high-silicon aluminum alloy and a manufacturing method technology, applied in the field of powder metallurgy, can solve problems such as being unsuitable for mass production, unable to take into account the shape, complex process, etc., achieve scientific and reasonable material composition ratio, reduce production cost, and simple preparation process Effect

Active Publication Date: 2018-01-09
NBTM NEW MATERIALS GRP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The commonly used physical methods are mainly semi-solid forming techniques such as mechanical stirring and electromagnetic stirring to control the silicon phase. Although the microstructure of the silicon phase has been greatly improved, it is not suitable for industrial processes due to expensive equipment, complicated processes, and low efficiency. mass production on
The chemical method is mostly a chemical metamorphic refinement method, but the metamorphic refinement effect is limited to a single primary silicon phase or eutectic silicon phase, and cannot take into account both forms.

Method used

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  • A method for manufacturing a powder metallurgy high-silicon aluminum alloy compressor piston
  • A method for manufacturing a powder metallurgy high-silicon aluminum alloy compressor piston
  • A method for manufacturing a powder metallurgy high-silicon aluminum alloy compressor piston

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] 1. Mixing: The chemical composition of the piston is: Al-14%Si-2.5%Cu-1%Mg (mass fraction), and the ingredients are 48.8% 100-mesh aluminum powder (such as figure 2 shown), 50% of 100 mesh Al-28%Si-5%Cu-2%Mg alloy powder (such as image 3 shown), add 1.2% organic wax as a lubricant.

[0035] 2. Forming: Mold the mixed powder at room temperature, the pressing pressure is 450MPa, and the forming density is 2.40g / cm 3 .

[0036] 3. Dewaxing: Rapidly heat the green body to 420°C and keep it warm for 30 minutes. The protective atmosphere is pure nitrogen, the nitrogen dew point is ≤-30°C, and the residual carbon content after dewaxing is ≤0.05%.

[0037] 4. Sintering: heat the dewaxed product to 550°C, keep it warm for 30 minutes, the protective atmosphere is pure nitrogen, the dew point of nitrogen is ≤ -45°C, and the sintering density is 2.60g / cm 3 .

[0038] 5. Heat treatment: solid solution temperature 510°C, heat preservation 110min, artificial aging temperature 15...

Embodiment 2

[0047] 1. Mixing: The chemical composition of the piston is: Al-28%Si-2%Mg (mass fraction), 98.5% 100 mesh Al-28%Si-2%Mg (mass fraction) alloy powder, 1.5% amide Wax acts as a lubricant.

[0048]2. Forming: Mold the mixed powder at room temperature, the pressing pressure is 450MPa, and the forming density is 2.40g / cm 3 .

[0049] 3. Dewaxing: The green body is rapidly heated to 420°C and held for 30 minutes, the protective atmosphere is pure nitrogen, the nitrogen dew point is ≤ -30°C, and the residual carbon content after dewaxing is ≤0.05%.

[0050] 4. Sintering: Heat the dewaxed product to 585°C, keep it warm for 30 minutes, the protective atmosphere is pure nitrogen, the nitrogen dew point is ≤ -45°C, and the sintering density is 2.50g / cm 3 .

[0051] 5. Shaping: Squeeze and deform the sintered piston in a shaping mold to correct the deformation caused by sintering, the deformation amount is 0.5-5%, and improve the size and shape tolerance of the piston.

[0052] 6. Ma...

Embodiment 3

[0058] 1. Mixing: The chemical composition of the piston is: Al-32%Si-2%Cu-1%Mg (mass fraction), the ingredients are 64% of 100 mesh Al-50% Si alloy powder, 2% of 200 mesh Al - 50% Mg alloy powder, 2% 200-mesh copper powder, the balance 200-mesh aluminum powder, 1.0% amide wax is added to the alloy powder as a lubricant.

[0059] 2. Forming: Heat the mixed powder and female mold to 100°C for forming, the pressing pressure is 600MPa, and the forming density is 2.30g / cm 3 .

[0060] 3. Dewaxing-sintering: Heat the green body rapidly to 420°C, keep it warm for 30 minutes, then raise the temperature to 550°C, keep it warm for 30 minutes, to achieve one-time dewaxing-sintering, the protective atmosphere is pure nitrogen, nitrogen dew point ≤ -45°C, sintering The density is 2.60g / cm 3 .

[0061] 5. Heat treatment: solid solution temperature 490°C, heat preservation 90min, artificial aging temperature 160°C, time 8 hours.

[0062] 6. Shaping: Squeeze and deform the sintered pisto...

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Abstract

The invention relates to a method for manufacturing a powder metallurgy high-silicon aluminum alloy compressor piston. The material is silicon: 14-32%, copper: 0-5.0%, magnesium: 0.8-2.0%, iron≤0.3%, and other impurities ≤2.0%, the rest is aluminum, according to the composition of the piston alloy, take pure aluminum powder and aluminum alloy powder for batching, and add 0.8-2.0% organic wax binder or lubricant for mixing, and then after forming and dewaxing , sintering, heat treatment, shaping, machining, brushing, vacuum impregnation, cleaning, curing, oxidation and a series of steps. The preparation process of the invention is simple, the ingredients are reasonable, and it has the characteristics of less processing amount and high material utilization. The material composition ratio of the piston is reasonable, which reduces the production cost and improves the production efficiency. The primary silicon in the microstructure of the formed piston is very small. Granular and evenly distributed, it can effectively improve the overall strength and friction and wear performance of the piston.

Description

technical field [0001] The invention belongs to the technical field of powder metallurgy, in particular to a method for manufacturing a piston of a powder metallurgy high-silicon aluminum alloy compressor. Background technique [0002] At present, there are three main types of materials for compressor pistons: aluminum-silicon alloy, gray cast iron and iron-based powder metallurgy. Some literatures have comparatively studied the wear resistance of these three materials, and the results show that: under a given sliding friction condition, the wear resistance of aluminum-silicon alloy is the highest, followed by iron-based powder metallurgy, and gray cast iron has the highest wear resistance. Poor [Zhou Xiaoxia, Zhu Weiming, Wu Dongxiao. Comparison of wear resistance of aluminum-silicon alloy, iron-based powder metallurgy, and gray cast iron. Physical and Chemical Testing-Physical Volume [J]. 2000(36), No1: 13-15]. In order to improve the mechanical properties and wear resist...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B22F3/16B22F1/00B22F5/00C22C21/02
Inventor 周国燕包崇玺柳睿赵万军
Owner NBTM NEW MATERIALS GRP
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