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CuSn10 alloy injection forming method

A technology of injection molding and alloying, applied in the direction of special adhesive granulation, etc., can solve the problems of many inclusions, uneven structure, and inability to ensure the uniformity of green compact density.

Inactive Publication Date: 2007-07-11
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Copper alloy parts prepared by precision casting or casting + cutting are prone to defects such as composition segregation, uneven structure, and many inclusions, and these two processes have low production efficiency and high production costs, making it difficult to achieve mass production
Casting + cutting will also cause a lot of waste of raw materials
The traditional powder metallurgy method adopts a simple powder mixing-pressing-sintering process to prepare high-performance copper alloys, but this method cannot guarantee the uniformity of the internal density of the green compact during the pressing process, and it is easy to cause copper alloys in the sintering process. The expansion of the part affects the further improvement of the performance of the part, and it is impossible to produce parts with complex shapes by this method

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] Raw materials: The binder is composed of 60% PW, 25% PS, 5% EVA, and 10% SA by mass percentage, the particle size of CuSn10 powder is 6 μm, and the powder loading is 64 vol%.

[0016] Mix the powder and the prepared binder on an open rubber mixer for 1.5 hours, the mixing temperature is 125°C, and then granulate on a mixing extruder to make the feed mix evenly. The feed material after granulation is injected under the condition that the injection temperature is 150 ° C and the injection pressure is 90 MPa to obtain the copper alloy preform of the desired shape, and then the preform is immersed in trichlorethylene for degreasing for 8 hours. The degreasing temperature is 30°C. After degreasing, take out the blank and dry it in a constant temperature drying oven. Thermal degreasing is carried out between 30 and 550°C for a total of 10 hours. After degreasing, heat the degreasing blank to 650°C for pre-sintering. The blank was sintered at 880°C for 0.5 hours in a nitrogen-...

Embodiment 2

[0018] Raw materials: The binder is composed of 70% PW, 10% PS, 15% EVA, and 5% SA by mass percentage, the particle size of CuSn10 powder is 6 μm, and the powder loading is 56 vol%.

[0019] Mix the powder and the prepared binder on an open rubber mixer for 1.5 hours, the mixing temperature is 123°C, and then granulate on a mixing extruder to make the feed mix evenly. The feed material after granulation is injected under the condition that the injection temperature is 135 ° C and the injection pressure is 80 MPa to obtain the copper alloy preform of the desired shape, and then the preform is immersed in trichlorethylene for degreasing for 8 hours. The degreasing temperature is 30°C. After degreasing, take out the blank and dry it in a constant temperature drying oven. Thermal degreasing is carried out between 30-550°C for a total of 12 hours. After degreasing, heat the degreasing blank to 650°C for pre-sintering. The billet is sintered in a nitrogen-hydrogen mixture of N2:H2=1...

Embodiment 3

[0021] Raw materials: the binder is composed of 60% PW, 20% PS, 12% EVA, and 8% SA by mass percentage, the particle size of CuSn10 powder is 15 μm, and the powder loading is 63 vol%.

[0022] Mix the powder and the prepared binder on an open rubber mixer for 1 hour, the mixing temperature is 130°C, and then granulate on a mixing extruder to make the feed mix evenly. The feed material after granulation is injected under the condition that the injection temperature is 145 ° C and the injection pressure is 75 MPa to obtain the copper alloy preform of the desired shape, and then the preform is immersed in trichlorethylene for degreasing for 6 hours. The degreasing temperature is 40°C, after the degreasing is completed, take out the blank and dry it in a constant temperature drying oven. The thermal degreasing is carried out between 30-550°C, and the total degreasing is 8 hours. Blank in N 2 :H 2 = Sintering at 900°C for 1 hour in a 1:1 nitrogen-hydrogen mixture to obtain copper ...

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Abstract

The invention relates to an injection shaping method of CuSn 10 alloy, wherein said method comprises that: the diameter of CuSn 10 alloy is 6-50 mum; the adhesive is the polymer of ceresin wax PW, polyphenylacetylene PS, acetic acid ethyenyl ester polymer EVA, and geoceric acid SA. And the method comprises that: mixing and cubing the CuSn10 powder and adhesive at 55-66vol%, injecting and shaping; using solvent defatting method and thermal defatting method to remove adhesive to be sintered at 600-750Deg. C; at last, under reducing gas or inertia gas, sintering to obtain the final element. The invention can produce copper alloy element with complex shape and high quality with low cost.

Description

technical field [0001] The invention belongs to the technical field of copper alloy forming, and in particular provides a CuSn10 alloy injection forming method. It is suitable for preparing copper alloy parts with high performance, high dimensional accuracy and complex shapes. Background technique [0002] Copper is the earliest metal used by humans, and it is also one of the most widely used metals today. Copper and copper alloys are widely used in friction materials, oil-impregnated bearings, electrical contact materials, conductive materials, diamond products, Filters and mechanical parts play an important role in the fields of automobiles, home electronics, and communications. [0003] At present, the methods for preparing CuSn10 parts mainly include: precision casting, casting+cutting and powder metallurgy. Copper alloy parts prepared by precision casting or casting + cutting are prone to defects such as composition segregation, uneven structure, and many inclusions....

Claims

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Application Information

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IPC IPC(8): B22F3/00B01J2/28
Inventor 曲选辉何新波唐安旭任淑彬
Owner UNIV OF SCI & TECH BEIJING
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