CN1686642A - Method of preparing high size precision profiled molybdenum parts - Google Patents
Method of preparing high size precision profiled molybdenum parts Download PDFInfo
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- CN1686642A CN1686642A CN 200510011685 CN200510011685A CN1686642A CN 1686642 A CN1686642 A CN 1686642A CN 200510011685 CN200510011685 CN 200510011685 CN 200510011685 A CN200510011685 A CN 200510011685A CN 1686642 A CN1686642 A CN 1686642A
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Abstract
A process for preparing molybdenum part with high size precision and compactness includes preparing adhesive from paraffin wax, high-density polyethene, polypropene and stearic acid through proportionally mixing, mixing it with molybdenum powder, injection moulding, degreasing, presintering, sintering, holding the temp for 1-10 hr, and post treating.
Description
Technical field
The invention belongs to the injection molding technology field, a kind of method for preparing high size precision profiled molybdenum parts particularly is provided.
Background technology
As a kind of rare refractory metal (2620 ℃ of fusing points), metallic aluminium has high heat conductivility, low thermal expansivity and a series of good characteristics such as high Young's modulus and intensity, makes it become widely used materials such as modern national defense, aerospace, nuclear industry, high-performance electronic parts.For example, at aviation field, can be used as trunnion, nozzle and the valve etc. of aircraft engine; In electronic industry, can be used as grid and anode-supported material in the electron tube, the hot cathode structural element of high-power microwave tubes, the substrate of power transistor, silicon rectifier and radiator element etc.
Powder metallurgy process is one of main processing technology of refractory metal, but the dimensional accuracy of products that traditional powder compression sintering process is produced is not high, and the part shape complexity is restricted.In addition, because molybdenum is brittle at ambient temperature, processing characteristics is relatively poor, when adopting the method for mechanical workout to prepare the molybdenum parts of complicated shape and high dimensional accuracy, and tooling cost height not only, waste of raw materials is also very big.These problems have become one of the development of restriction metal molybdenum and key in application problem.
Powder injection forming is one of at present the most popular in the world material forming technology, the maximum characteristics of this technology are to have overcome the conventional powder pressing process to be difficult to direct production complicated shape component, and the shortcoming that follow-up machining processes is long, raw material availability is low, cost is high is particularly suitable for the nearly end form mass production of thin-walled, complicated shape component.Because forming process is for flowing mold filling, shaping base density is even, therefore, and prepared product size precision height, and have the characteristics of homogeneous microstructure, superior performance.As seen, the powder injection forming technology is applied in the production of high size precision profiled molybdenum parts, is expected the difficulty that thorough solution faces at present.
Summary of the invention
The object of the present invention is to provide a kind of method for preparing high size precision profiled molybdenum parts, solved the shaping problem of the high dimensional accuracy and the complicated shape component of molybdenum.
The present invention realizes by following steps:
1. the preparation of binding agent.Paraffin, high density polyethylene(HDPE), polypropylene, stearic acid mixed in proportion obtain binding agent, its ratio is: paraffin: 30～70%, and high density polyethylene(HDPE): 15～35%, polypropylene: 10～30%, stearic acid: 1～10%, all be weight percentage.
2. the preparation of feeding.Binding agent that step 1 is obtained and molybdenum powder mix makes feeding, and the shared volume ratio of molybdenum powder is 45～60% in the feeding, and the best is 48～56%.
3. injection forming.Feeding is injection forming on injector, and injection temperature is 120～170 ℃, and injection pressure is 80～140MPa.
4. degreasing and presintering.The injection base adopts the degreasing process of solvent degreasing+subsequent thermal degreasing, at first will inject base solvent degreasing 2～12 hours in trieline, then oven dry.Hot degreasing and presintering are carried out between 20～1500 ℃, and needing the time altogether is 8～20 hours.
5. sintering.After injection base substrate degreasing and the presintering, 1900～2300 ℃ sintering temperature in sintering oven is incubated 1～10 hour, and sintered products obtains molybdenum parts through subsequent disposal.
The invention has the advantages that:
1, the powder injection forming technology is applied in the production of high size precision profiled molybdenum parts, the product size precision that has solved conventional powder compacting sintering explained hereafter is not high, the part shape complexity is restricted, and the waste of follow-up machining materials is big, the shortcoming that cost is high.
2, with aluminium powder form with after binding agent mixes, the feeding that obtains mixes, the feeding shaping base density that injection forming obtains on injection machine is even, product shrinks consistent during sintering.Sintered products does not need any mechanical process, and feeding can reuse, and material use efficiency almost reaches 100%.
3, adopt solvent degreasing and hot degreasing process combined, not only shortened whole degreasing time, reduced the blank deformation risk simultaneously, production efficiency and yield rate have been improved, the product size precision height of being produced, performance uniformity, and can produce in batches, cost is low.The density of molybdenum parts that adopts the preparation of this method is greater than 95%, and dimensional precision is within ± 0.3%.
Embodiment
Embodiment 1:
With 60% paraffin, 25% high density polyethylene(HDPE), 10% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 54%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 160 ℃, injection pressure is 100MPa, the injection base of gained extracts degreasing 4 hours in trieline, be placed in dry 30 minutes under 60 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 8 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2000 ℃, and sintering time is 6 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Embodiment 2:
With 55% paraffin, 25% high density polyethylene(HDPE), 15% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 54%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 120MPa, the injection base of gained extracts degreasing 2 hours in trieline, be placed in dry 30 minutes under 60 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 8 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2100 ℃, and sintering time is 3 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Embodiment 3:
With 50% paraffin, 25% high density polyethylene(HDPE), 15% polypropylene and 10% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 52%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 100MPa, the injection base of gained extracts degreasing 4 hours in trieline, be placed in dry 30 minutes under 60 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 6 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2100 ℃, and sintering time is 3 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Embodiment 4:
With 45% paraffin, 25% high density polyethylene(HDPE), 25% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 52%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 110MPa, the injection base of gained extracts degreasing 4 hours in trieline, be placed in dry 30 minutes under 40 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 6 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2100 ℃, and sintering time is 3 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Embodiment 5:
With 40% paraffin, 35% high density polyethylene(HDPE), 25% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 50%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 100MPa, the injection base of gained extracts degreasing 2 hours in trieline, be placed in dry 60 minutes under 30 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 8 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2200 ℃, and sintering time is 2 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Embodiment 6:
With 65% paraffin, 15% high density polyethylene(HDPE), 15% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 50%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 90MPa, the injection base of gained extracts degreasing 6 hours in trieline, be placed in dry 30 minutes under 60 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 6 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2200 ℃, and sintering time is 2 hours, promptly obtains molybdenum parts.
Embodiment 7:
With 60% paraffin, 20% high density polyethylene(HDPE), 15% polypropylene and 5% stearic acid mix and make binding agent, the volume ratio of molybdenum powder is 48%, with molybdenum powder and binding agent after mixing on the SK-160 type opening rubber mixing machine, on PSJ32 type mixing extruder, granulate again, make feeding further even, feeding is injection forming on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 100MPa, the injection base of gained extracts degreasing 2 hours in trieline, be placed in dry 30 minutes under 60 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, hot degreasing time is 6 hours, and the degreasing base was carried out presintering after 1 hour in 1200 ℃ hydrogen furnace, place medium-frequency induction furnace to carry out sintering, sintering temperature is 2200 ℃, and sintering time is 2 hours, and sintered products promptly obtains molybdenum parts through subsequent disposal.
Claims (2)
1. the production method of a high size precision profiled molybdenum parts, it is characterized in that: preparation technology is:
A. the preparation of binding agent: paraffin, high density polyethylene(HDPE), polypropylene, stearic acid mixed in proportion obtain binding agent, its ratio is: paraffin: 30～70%, and high density polyethylene(HDPE): 15～35%, polypropylene: 10～30%, stearic acid: 1～10%, all be weight percentage;
B. the preparation of feeding: binding agent that step a is obtained and molybdenum powder mix makes feeding, and the shared volume of molybdenum powder is 45～60% in the feeding;
C. injection forming: feeding is injection forming on injector, and injection temperature is 120～170 ℃, and injection pressure is 80～140MPa;
D. degreasing and presintering: the injection base adopts solvent degreasing to add the degreasing process of subsequent thermal degreasing, at first will inject base solvent degreasing 2～12 hours in trieline.Hot degreasing and presintering are carried out between 20～1500 ℃, and needing the time altogether is 8～20 hours.
E. sintering: after injection base substrate degreasing and the presintering, 1900～2300 ℃ sintering temperature in sintering oven is incubated 1～10 hour, obtains molybdenum parts.
2, method according to claim 1 is characterized in that: the shared volume of molybdenum powder is 48～56% in the feeding.
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| CNB2005100116850A CN1309547C (en) | 2005-05-08 | 2005-05-08 | Method of preparing high size precision profiled molybdenum parts |
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| CNB2005100116850A CN1309547C (en) | 2005-05-08 | 2005-05-08 | Method of preparing high size precision profiled molybdenum parts |
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| CN1309547C CN1309547C (en) | 2007-04-11 |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464905C (en) * | 2007-01-19 | 2009-03-04 | 北京科技大学 | Method for preparing blades of adjustable nozzle in use for turbocharger of engine by using powder as raw material |
| CN101972852A (en) * | 2010-11-19 | 2011-02-16 | 中南大学 | Method for preparing complex molybdenum part |
| CN102266943A (en) * | 2011-07-05 | 2011-12-07 | 金堆城钼业股份有限公司 | Method for preparing high-purity molybdenum electrode |
| CN101774020B (en) * | 2010-01-20 | 2012-10-03 | 中南大学 | Method for preparing molybdenum-copper component |
| CN102962455A (en) * | 2012-11-21 | 2013-03-13 | 兰州金浩机械制造有限公司 | Powder metallurgy injection molding process |
| CN104841938A (en) * | 2015-05-26 | 2015-08-19 | 北京科技大学 | Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts |
| CN104972129A (en) * | 2015-04-09 | 2015-10-14 | 玉溪大红山矿业有限公司 | Method for manufacturing iron-based alloy part |
| CN106001579A (en) * | 2016-06-03 | 2016-10-12 | 中山市奥博精密科技有限公司 | Technology for manufacturing panel of golf club |
| CN107335807A (en) * | 2016-12-13 | 2017-11-10 | 重庆文理学院 | One kind is metal powder injection molded to use binding agent |
| CN113414391A (en) * | 2021-07-12 | 2021-09-21 | 杭州铭赫科技有限公司 | Powder injection molding process |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH08132494A (en) * | 1994-11-10 | 1996-05-28 | Kobe Steel Ltd | Heating cylinder |
| JP2000015670A (en) * | 1998-04-28 | 2000-01-18 | Sony Corp | Mold for molding disc base and apparatus for molding and method for molding |
| DE10041194A1 (en) * | 2000-08-23 | 2002-03-07 | Starck H C Gmbh | Process for the production of composite components by powder injection molding and suitable composite powder |
| CN1180908C (en) * | 2003-09-30 | 2004-12-22 | 北京科技大学 | Method for preparing Kovar alloy electronic package box |
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2005
- 2005-05-08 CN CNB2005100116850A patent/CN1309547C/en not_active Expired - Fee Related
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100464905C (en) * | 2007-01-19 | 2009-03-04 | 北京科技大学 | Method for preparing blades of adjustable nozzle in use for turbocharger of engine by using powder as raw material |
| CN101774020B (en) * | 2010-01-20 | 2012-10-03 | 中南大学 | Method for preparing molybdenum-copper component |
| CN101972852A (en) * | 2010-11-19 | 2011-02-16 | 中南大学 | Method for preparing complex molybdenum part |
| CN102266943A (en) * | 2011-07-05 | 2011-12-07 | 金堆城钼业股份有限公司 | Method for preparing high-purity molybdenum electrode |
| CN102962455A (en) * | 2012-11-21 | 2013-03-13 | 兰州金浩机械制造有限公司 | Powder metallurgy injection molding process |
| CN102962455B (en) * | 2012-11-21 | 2014-12-24 | 兰州金浩机械制造有限公司 | Powder metallurgy injection molding process |
| CN104972129A (en) * | 2015-04-09 | 2015-10-14 | 玉溪大红山矿业有限公司 | Method for manufacturing iron-based alloy part |
| CN104841938A (en) * | 2015-05-26 | 2015-08-19 | 北京科技大学 | Production method for high-performance special-shaped iron-cobalt soft magnetic alloy parts |
| CN106001579A (en) * | 2016-06-03 | 2016-10-12 | 中山市奥博精密科技有限公司 | Technology for manufacturing panel of golf club |
| CN107335807A (en) * | 2016-12-13 | 2017-11-10 | 重庆文理学院 | One kind is metal powder injection molded to use binding agent |
| CN113414391A (en) * | 2021-07-12 | 2021-09-21 | 杭州铭赫科技有限公司 | Powder injection molding process |
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| CN1309547C (en) | 2007-04-11 |
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Assignee: Hebei Wuwei Aero & Power Technology Co.,Ltd. Assignor: University of Science and Technology Beijing Contract fulfillment period: 2006.12.26 to 2024.12.26 Contract record no.: 2008110000079 Denomination of invention: Method of preparing high size precision profiled molybdenum parts Granted publication date: 20070411 License type: Exclusive license Record date: 20081028 |
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Assignee: Hebei Wuwei Aero & Power Technology Co.,Ltd. Assignor: University of Science and Technology Beijing Contract record no.: 2008110000079 Date of cancellation: 20130318 |
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