CN100448571C - CuSn10 alloy injection forming method - Google Patents
CuSn10 alloy injection forming method Download PDFInfo
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- CN100448571C CN100448571C CNB2006101698497A CN200610169849A CN100448571C CN 100448571 C CN100448571 C CN 100448571C CN B2006101698497 A CNB2006101698497 A CN B2006101698497A CN 200610169849 A CN200610169849 A CN 200610169849A CN 100448571 C CN100448571 C CN 100448571C
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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
The invention belongs to copper alloy forming technique field, a kind of CuSn10 alloy ejection forming method particularly is provided.Be applicable to preparation high-performance, high dimensional accuracy, the copper alloy element of complicated shape.
Background technology
Copper is the human metal that uses the earliest, also is one of present most widely used metal.Copper and copper alloy are owing to have a series of premium properties: electrical conductivity and thermal conductivity height, corrosion resistance is strong, it is big etc. that intensity is moderate to, be widely used in friction material, oiliness bearing, electrical contact material, conductive material, diamond composition, filter and machine components etc., play an important role in fields such as automobile, household electrical appliances electronics, communications.
The method for preparing at present the CuSn10 parts mainly contains: technologies such as hot investment casting, casting+machining and powder metallurgic method.The copper alloy part of the method for hot investment casting or casting+machining preparation component segregation occurs, tissue odds spares, is mingled with defectives such as more easily, and these two explained hereafter efficient are low, and the production cost height is difficult to realize producing in batches.Casting+machining also can cause raw-material a large amount of waste.Traditional powder metallurgic method adopts the simple powder-compacting-sintering process that mixes can prepare the copper alloy of superior performance, but the uniformity of pressed compact internal density in the process that this method can't guarantee to suppress, easily cause the expansion of copper alloy in sintering process, thereby influence the further raising of part performance, and adopt this method can't produce complex-shaped part.
Metal injection moulding technology is prior powder metallurgy to be combined with plastic injection-moulded forming technique and a kind of new parts process technology that forms, compare with traditional technology, adopt injection molding process to prepare the CuSn10 alloy part and have following advantage: 1) can be according to using needs, make the copper alloy element of various complicated shapes easily, as bearing, gear, packing ring etc.; 2) can guarantee the uniformity of part interior tissue and composition, make copper alloy obtain favorable conductive and heat conductivility; 3) in sintering process, can suppress the expansion of copper alloy to a certain extent, be implemented in the sintering under the higher temperature, help obtaining excellent mechanical property; 4) technology is simple, the production efficiency height, and product size precision height, and stock utilization can reduce production costs effectively near 100%.
Summary of the invention
The objective of the invention is to, a kind of CuSn10 copper alloy ejection forming method is provided, can realize producing copper alloy element complex-shaped, function admirable in batches with lower cost.
The present invention adopts ejection forming method to prepare the shaping base, prepares the copper alloy part by degreasing and sintering then.Concrete technology is:
1, the preparation of binding agent: in whole binding agent, the shared mass percent of paraffin PW is 60～70%, polystyrene PS mass percent is 5～30%, and vinyl acetate copolymer EVA mass percent is 5～30%, and stearic acid SA mass percent is 2%～10%.To carry out blend in four kinds of constituent elements adding torque rheometers or the double helix extruder, and it is even to reach composition;
2, mixing: with selected copper alloy powder and the binding agent prepared on rubber mixing machine mixing 1～1.5 hour in proportion, melting temperature was 120～130 ℃, granulates on mixing extruder again, makes feeding further even, and the powder useful load is 50～66vol%;
3, injection moulding: the back of granulating is 130～150 ℃ in injection temperature, and injection pressure is to inject under the condition of 70～90MPa, obtains the copper alloy preform of required form;
4, degreasing: the degreasing process of solvent degreasing+subsequent thermal degreasing is adopted in the degreasing of shaping base, at first preform is dipped in and carries out solvent degreasing 4～8 hours in the trichloro-ethylene, and skimming temp is 30～40 ℃, takes out blank after degreasing is finished, then oven dry; Hot degreasing is carried out between 30～550 ℃, needs 6～12 hours altogether, after the degreasing degreasing base is heated between 600 ℃～750 ℃ and carries out presintering;
5, sintering: with presintering base sintering temperature of 880～920 ℃ in sintering furnace, be incubated 0.5～1 hour, volume ratio is N
2: H
2=(1～5): the nitrogen and hydrogen mixture of (2～3).
The selected copper alloy powder of the present invention is aerosolization CuSn10 alloy powder or water atomization CuSn10 alloy powder, and the particle diameter of powder is 6～50 μ m.
The invention has the advantages that: adopt the CuSn10 alloy of the method preparation, relative density is greater than 96%, and hot strength is greater than 200MPa, and hardness is greater than 50HB, and dimensional accuracy is within ± 0.5%.
The specific embodiment
Embodiment 1:
Raw material: binding agent is that 60%PW, 25%PS, 5%EVA, 10%SA form by mass percent, and the CuSn10 powder diameter is 6 μ m, and the powder useful load is 64vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1.5 hours, melting temperature was 125 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 150 ℃ in injection temperature, injection pressure is to inject under the condition of 90MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 8 hours, skimming temp is 30 ℃, taking out blank after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 10 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N2: H2=5: in 3 the nitrogen and hydrogen mixture in 880 ℃ sintering temperature 0.5 hour, promptly get relative density 96%, hot strength 213MPa, hardness 51HB, the copper alloy element of dimensional accuracy within ± 0.3%.
Embodiment 2:
Raw material: binding agent is that 70%PW, 10%PS, 15%EVA, 5%SA form by mass percent, and the CuSn10 powder diameter is 6 μ m, and the powder useful load is 56vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1.5 hours, melting temperature was 123 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 135 ℃ in injection temperature, injection pressure is to inject under the condition of 80MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 8 hours, skimming temp is 30 ℃, taking out blank after degreasing is finished dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 12 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N2: H2=1: in 3 the nitrogen and hydrogen mixture in 910 ℃ sintering temperature 1 hour, promptly get relative density 98%, hot strength 215MPa, hardness 57HB, the copper alloy element of dimensional accuracy within ± 0.4%.
Embodiment 3:
Raw material: binding agent is that 60%PW, 20%PS, 12%EVA, 8%SA form by mass percent, and the CuSn10 powder diameter is 15 μ m, and the powder useful load is 63vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1 hour, melting temperature was 130 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 145 ℃ in injection temperature, injection pressure is to inject under the condition of 75MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 6 hours, skimming temp is 40 ℃, takes out blank after degreasing is finished and dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 8 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N
2: H
2In 900 ℃ sintering temperature 1 hour, promptly get relative density 96%, hot strength 205MPa, hardness 53HB, the copper alloy element of dimensional accuracy within ± 0.2% in=1: 1 the nitrogen and hydrogen mixture.
Embodiment 4:
Raw material: binding agent is that 63%PW, 17%PS, 15%EVA, 5%SA form by mass percent, and the CuSn10 powder diameter is 15 μ m, and the powder useful load is 61vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1 hour, melting temperature was 125 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 145 ℃ in injection temperature, injection pressure is to inject under the condition of 90MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 6 hours, skimming temp is 40 ℃, takes out blank after degreasing is finished and dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 12 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N
2: H
2In 920 ℃ sintering temperature 1 hour, promptly get relative density 97%, hot strength 212MPa, hardness 53HB, the copper alloy element of dimensional accuracy within ± 0.2% in=1: 2 the nitrogen and hydrogen mixture.
Embodiment 5:
Raw material: binding agent is that 67%PW, 21%PS, 10%EVA, 2%SA form by mass percent, and the CuSn10 powder diameter is 20 μ m, and the powder useful load is 57vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1 hour, melting temperature was 130 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 145 ℃ in injection temperature, injection pressure is to inject under the condition of 85MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 6 hours, skimming temp is 40 ℃, takes out blank after degreasing is finished and dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 10 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N
2: H
2In 900 ℃ sintering temperature 1 hour, promptly get relative density 97%, hot strength 213MPa, hardness 54HB, the copper alloy element of dimensional accuracy within ± 0.5% in=2: 1 the nitrogen and hydrogen mixture.
Embodiment 6:
Raw material: binding agent is that 61%PW, 21%PS, 12%EVA, 6%SA form by mass percent, and the CuSn10 powder diameter is 30 μ m, and the powder useful load is 52vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1 hour, melting temperature was 125 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 140 ℃ in injection temperature, injection pressure is to inject under the condition of 110MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 4 hours, skimming temp is 35 ℃, takes out blank after degreasing is finished and dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, need 6 hours altogether, after the degreasing degreasing base be heated to 650 ℃ and carry out presintering, at last with the presintering base at N
2: H
2In 910 ℃ sintering temperature 1 hour, promptly get relative density 96%, hot strength 207MPa, hardness 53HB, the parts of dimensional accuracy within ± 0.2% in=2: 1 the nitrogen and hydrogen mixture.
Embodiment 7:
Raw material: binding agent is that 64%PW, 23%PS, 6%EVA, 7%SA form by mass percent, and the CuSn10 powder diameter is 50 μ m, and the powder useful load is 63vol%.
With powder and the binding agent for preparing on opening rubber mixing machine mixing 1 hour, melting temperature was 130 ℃, granulates on mixing extruder again, and feeding is mixed.Feeding after the granulation is 145 ℃ in injection temperature, injection pressure is to inject under the condition of 85MPa, obtain the copper alloy preform of required form, then preform was immersed in the trichloro-ethylene degreasing 4 hours, skimming temp is 35 ℃, takes out blank after degreasing is finished and dries in thermostatic drying chamber, hot degreasing is carried out between 30～550 ℃, altogether degreasing is 6 hours, after the degreasing degreasing base is heated to 650 ℃ and carries out presintering, at last with the presintering base at N
2: H
2In 920 ℃ sintering temperature 1 hour, promptly get relative density 96%, hot strength 202MPa, hardness 51HB, the parts of dimensional accuracy within ± 0.5% in=2: 1 the nitrogen and hydrogen mixture.
Claims (2)
1, a kind of ejection forming method of CuSn10 alloy is characterized in that, technology is:
The preparation of a, binding agent: in whole binding agent, the shared mass percent of paraffin PW is 60～70%, and polystyrene PS mass percent is 5～30%, and vinyl acetate copolymer EVA mass percent is 5～30%, and stearic acid SA mass percent is 2～10%; To carry out blend in four kinds of constituent elements adding torque rheometers or the double helix extruder, and it is even to reach composition;
B, mixing: with selected copper alloy powder and the binding agent prepared on opening rubber mixing machine mixing 1～1.5 hour in proportion, melting temperature is 120～130 ℃, granulate on mixing extruder, make feeding further even, the powder useful load is 50～66vol%;
C, injection moulding: the back of granulating is 130～150 ℃ in injection temperature, and injection pressure is to inject under the condition of 70～90MPa, obtains the copper alloy preform of required form;
D, degreasing: the degreasing process of solvent degreasing+subsequent thermal degreasing is adopted in the degreasing of shaping base, at first preform is dipped in and carries out solvent degreasing 4～8 hours in the trichloro-ethylene, and skimming temp is 30～40 ℃, takes out blank after degreasing is finished, then oven dry; Hot degreasing was carried out between 30～550 ℃ 6～14 hours, after the degreasing degreasing base was heated between 600 ℃～750 ℃ and carried out presintering;
E, sintering: with presintering base sintering temperature of 880～920 ℃ in sintering furnace, be incubated 0.5～1 hour, adopt the protection of nitrogen and hydrogen mixture atmosphere in the sintering process, gas volume is than being N
2: H
2=1～5: 2～3.
2, method according to claim 1 is characterized in that: selected copper alloy powder is aerosolization CuSn10 alloy powder or water atomization CuSn10 alloy powder, and the particle diameter of powder is 6～50 μ m.
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| CNB2006101698497A CN100448571C (en) | 2006-12-29 | 2006-12-29 | CuSn10 alloy injection forming method |
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| CNB2006101698497A CN100448571C (en) | 2006-12-29 | 2006-12-29 | CuSn10 alloy injection forming method |
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| CN100448571C true CN100448571C (en) | 2009-01-07 |
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Families Citing this family (7)
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| CN101445881B (en) * | 2007-11-26 | 2011-07-27 | 比亚迪股份有限公司 | Method for injection forming material by rustless steel powder |
| CN102328075B (en) * | 2011-07-22 | 2013-06-26 | 浙江一火科技有限公司 | Stainless steel rehabilitation medical instrument and manufacture method thereof |
| CN102328073B (en) * | 2011-07-22 | 2013-09-04 | 浙江一火科技有限公司 | Ratchet pin of box joint type water pump pliers and manufacture method of ratchet pin |
| CN103381482A (en) * | 2013-08-01 | 2013-11-06 | 兰州金浩机械制造有限公司 | Injection forming method for preparing helical gear |
| CN106141192A (en) * | 2015-07-24 | 2016-11-23 | 洛阳新巨能高热技术有限公司 | A kind of copper alloy element manufacture method |
| CN107052345A (en) * | 2016-12-28 | 2017-08-18 | 江苏精研科技股份有限公司 | Copper alloy injection molding process |
| CN113073219B (en) * | 2021-03-24 | 2022-04-22 | 山东银山电气有限公司 | Manufacturing method of precision resistance material applied to instruments and meters |
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Patent Citations (4)
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| JPS55134147A (en) * | 1979-04-09 | 1980-10-18 | Mitsubishi Metal Corp | Cu-sn type sintered oil-containing bearing combined with solid lubricant |
| CN1552545A (en) * | 2003-05-29 | 2004-12-08 | 中科铜都粉体新材料股份有限公司 | Mixed copper-tin 10 powder and preparing method thereof |
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