CN1180908C - Method for preparing Kovar alloy electronic package box - Google Patents
Method for preparing Kovar alloy electronic package box Download PDFInfo
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- CN1180908C CN1180908C CNB031544797A CN03154479A CN1180908C CN 1180908 C CN1180908 C CN 1180908C CN B031544797 A CNB031544797 A CN B031544797A CN 03154479 A CN03154479 A CN 03154479A CN 1180908 C CN1180908 C CN 1180908C
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Abstract
The present invention provides a method for preparing a Kovar alloy electronic package box. 53 to 55 wt% of ferrum powder, 29 to 31 wt % of nickel powder and 16 to 18 wt% of cobalt powder are matched together, and milled for 2 to 8 hours by a high energy ball mill to obtain an alloy composite powder; a binding agent is added to the alloy composite powder so as to form uniform feedstock, and the powder load is 55 to 64%; the feedstock is formed by injection on an injection machine, the temperature is 150 to 170 DEG C, and the pressure is 90 to 110Mpa; by adopting a degreasing process of solvent degreasing and subsequent hot degreasing, an injection formed blank is put in trichloroethylene for the solvent degreasing for 2 to 6 hours, and dried for 30 to 60 minutes at a temperature of 40 to 60 DEG C; the hot degreasing is carried out at a temperature of a room temperature to 600 DEG C, and the time is 6 to 8 hours; the injection formed blank is sintered at a temperature of 1250 to 1280 DEG C in a sintering furnace after being degreased, the temperature is kept for 1 to 3 hours, and the package box is obtained by the subsequent processing of the sintered product. The present invention has the advantages of high utilization rate of materials, and high dimensional precision.
Description
Technical field
The invention belongs to powder metallurgical technology, a kind of method of the Kovar of preparation alloy Electronic Packaging box body particularly is provided.
Background technology
The present invention is relevant with injection molding technology, and a kind of preparation method of Kovar alloy Electronic Packaging box body is provided.
The package metals box body is the vital part of high-power microelectronics and optical-fibre communications interface unit, and the inefficacy of box body or unstable properties are one of main factors that influences the complete machine quality.In order to guarantee the job stability of electronic component in the box body, material that require to make metal case must in certain temperature range, have stable and with packaged glass or the corresponding to thermal coefficient of expansion of ceramic material, to avoid the big internal stress of the excessive generation of expansion coefficient difference, cause that the packaging part heat fatigue is destroyed and " bursting " gas leakage owing to the two.The Kovar controlled expansion alloy especially can be realized good matched seal effect with Bohemian glass and pottery because good electricity, magnetic and mechanical property are arranged, and is widely used as the material of this box body.
The existing long history of the application of Kovar alloy, but also there is following problem in the Kovar alloy that the machine that uses at present adds and Sheet Metal Forming Technology is produced encapsulation box: (1) machine-tooled method manufacturing cost height, wastage of material is big; (2) because cold deformation is big, and the hot expansibility of Package boxes on all directions has than big-difference, the properties of product uniformity is poor, often causes device in use, ftractures, leaks destruction in sealing-in place; (3) because Kovar alloy plastic deformation ability is relatively poor, adopt process for stamping can only prepare the encapsulation box of wall thickness below 0.3mm, when using in high power device, thermal deformation often takes place, cause the whole destruction of packaging; (4) process for stamping is difficult for some box bodys with many steps and cross-drilled hole of preparation, follow-up machined not only the cycle long, take that material is big, production cost is very high, and be difficult to the flatness and the surface quality of assurance box body inside.
Powder metallurgical technique can be relatively easy to realize the accurate control of material composition, tissue and performance in material preparation.Powder injection forming is one of at present the most popular in the world material forming technology, is particularly suitable for the nearly end form production of thin-walled, complicated shape part.Therefore, the powder injection forming technology is applied in the material preparation and part production of Kovar alloy Package boxes, is expected the difficulty that thorough solution faces at present.The invention provides the method for a kind of high-performance, high efficiency and low-cost production Kovar alloy Package boxes, the shaping problem of the thermal expansion anisotropy of emphasis solution alloy and the box body of complicated shape.
Summary of the invention
The objective of the invention is to: provide a kind of method of the Kovar of preparation alloy Electronic Packaging box body, to improve stock utilization and product size precision.
The present invention is through the preparation of material powder, and feeding prepares, injection moulding, and degreasing, sintering circuit prepares the Electronic Packaging box body, and concrete step of preparation process is as follows:
1. material powder preparation: iron, nickel, cobalt powder be Fe by weight percentage: Ni: the ratio batching of Co=53～55: 29～31: 16～18, and utilize high energy ball mill that the mixed-powder ball milling was obtained alloy composite powder (abbreviation powder) in 2～8 hours.
2. feeding preparation: alloy composite powder and binding agent are mixed into uniform feeding, useful load is 55～64%, described useful load is meant the volume ratio of alloy composite powder and binding agent, the compound binding agent that described binding agent is made up of high density polyethylene (HDPE) 15～35 weight %, paraffin 60～80 weight % and stearic acid 3～15 weight %.Alloy composite powder useful load preferable range is 58-62%.
3. injection moulding: feeding is injection moulding on injector, and injection temperature is 150～170 ℃, and injection pressure is 90～110Mpa.
4. degreasing: the injection moulding base adopts the degreasing process of solvent degreasing and subsequent thermal degreasing, at first will inject base solvent degreasing 2～6 hours in trichloro-ethylene, then drying 30～60 minutes under 40～60 ℃ temperature.Hot degreasing is carried out between room temperature～600 ℃, and the time is 6～8 hours.
5. sintering: obtain the degreasing base after the degreasing of injection moulding base, degreasing base sintering temperature of 1250～1280 ℃ in sintering furnace is incubated 1～3 hour, and sintered products obtains Package boxes through subsequent treatment.
The invention has the advantages that: owing to utilize high energy ball mill with the powder premixed, the composition of raw material mixed-powder is more even, and granularity is more tiny, and sintering activity increases, sintered products density height.High-energy ball milling has also changed the granularity and the size distribution of powder, has improved the powder useful load, shrinkage factor when reducing the product sintering.With after binding agent mixes, the feeding that obtains mixes with powder, and it is even that feeding injection moulding on injection machine obtains box body injection moulding base density, and product shrinks consistent during sintering.Sintered products does not need any mechanical process, and feeding can reuse, and stock utilization reaches 100%.Adopt solvent degreasing and hot degreasing process combined, not only shortened the whole degreasing time spent, reduced risk of distortion simultaneously, improved production efficiency and yield rate, the box body dimensional accuracy height of being produced, the properties of product uniformity, and can produce in batches, cost is low.Adopt the thermal coefficient of expansion (5.5～7.5) * 10 of the Kovar alloy of this method preparation
-6℃
-1(20～500 ℃); Thermal expansion anisotropy is less than 5%; Density is greater than 98%; Air-tightness reaches 5 * 10
-9Pam
3/ s; Box body can plate Ni, plating Au, can carry out the Ag-Cu welding.
The specific embodiment
Embodiment 1:
Iron by weight percentage: nickel: cobalt is that 55: 29: 16 ratio prepares powder, ball milling 2 hours in high energy ball mill then, binding agent is by 60% paraffin, 35% high density polyethylene (HDPE) and 5% stearic acid are formed, the powder useful load is 56%, with 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 moulding on CJ80-E type injector, injection temperature is 160 ℃, injection pressure is 90MPa, the injection moulding base of gained extracts degreasing 2 hours in trichloro-ethylene, under 60 ℃ of temperature, be placed in dry 30 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 8 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1280 ℃, sintering time is 1 hour, promptly obtains Kovar alloy Package boxes.
Embodiment 2:
Iron by weight percentage: nickel: cobalt is that 55: 29: 16 ratio prepares powder, ball milling 4 hours in the high energy ball mill then, binding agent is by 60% paraffin, 35% high density polyethylene (HDPE) and 5% stearic acid are formed, the powder useful load is 58%, with 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 moulding on GJ80-E type injector, injection temperature is 160 ℃, injection pressure is 100Mpa, the injection moulding base of gained extracts degreasing 2 hours in trichloro-ethylene, under 60 ℃ of temperature, be placed in dry 30 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 6 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1280 ℃, sintering time is 1 hour, promptly obtains Kovar alloy Package boxes.
Embodiment 3:
Iron by weight percentage: nickel: cobalt is that 54: 30: 16 ratio prepares powder, ball milling 6 hours in high energy ball mill then, binding agent is by 80% paraffin, 15% high density polyethylene (HDPE) and 5% stearic acid are formed, the powder useful load is 58%, with 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 moulding on CJ80-E type injector, injection temperature is 150 ℃, injection pressure is 100Mpa, the injection moulding base of gained extracts degreasing 6 hours in trichloro-ethylene, under 40 ℃ of temperature, be placed in dry 60 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 6 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1250 ℃, sintering time is 3 hours, promptly obtains Kovar alloy Package boxes.
Embodiment 4:
Iron by weight percentage: nickel: cobalt is that 53: 29: 18 ratio prepares powder, ball milling 6 hours in high energy ball mill then, binding agent is by 80% paraffin, 17% high density polyethylene (HDPE) and 3% stearic acid are formed, the powder useful load is 62%, with 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 moulding on CJ80-E type injector, injection temperature is 160 ℃, injection pressure is 100Mpa, the injection moulding base of gained extracts degreasing 6 hours in trichloro-ethylene, under 50 ℃ of temperature, be placed in dry 40 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 6 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1250 ℃, sintering time is 2 hours, promptly obtains Kovar alloy Package boxes.
Embodiment 5:
Iron by weight percentage: nickel: cobalt is that 55: 29: 16 ratio prepares powder, ball milling 8 hours in high energy ball mill then, binding agent is by 70% paraffin, 20% high density polyethylene (HDPE) and 10% stearic acid are formed, the powder useful load is 64%, with 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 moulding on CJ80-E type injector, injection temperature is 170 ℃, injection pressure is 110Mpa, the injection moulding base of gained extracts degreasing 4 hours in trichloro-ethylene, under 60 ℃ of temperature, be placed in dry 30 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 6 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1260 ℃, sintering time is 1 hour, promptly obtains Kovar alloy Package boxes.
Embodiment 6:
Iron by weight percentage: nickel: cobalt is that 54: 29: 17 ratio prepares powder, ball milling 6 hours in high energy ball mill then, binding agent is by 65% paraffin, 25% high density polyethylene (HDPE) and 10% stearic acid are formed, the powder useful load is 58%, with 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 moulding on CJ80-E type injector, injection temperature is 160 ℃, injection pressure is 100Mpa, the injection moulding base of gained extracts degreasing 2 hours in trichloro-ethylene, under 60 ℃ of temperature, be placed in dry 30 minutes again and carry out hot degreasing in the atmosphere debinding furnace, degreasing time is 6 hours, places the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, and sintering temperature is 1270 ℃, sintering time is 1 hour, promptly obtains Kovar alloy Package boxes.
Embodiment 7:
Iron by weight percentage: nickel: cobalt is that 53: 31: 16 ratio prepares powder, ball milling 6 hours in high energy ball mill then, binding agent is by 65% paraffin, 25% high density polyethylene (HDPE) and 10% stearic acid are formed, the powder useful load is 60%, with 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, injection temperature is 165 ℃, injection pressure is 100Mpa, the injection moulding base of gained extracts degreasing 3 hours in trichloro-ethylene, be placed in dry 60 minutes under 40 ℃ of temperature and carry out hot degreasing in the atmosphere debinding furnace, and degreasing time is 6 hours, place the molybdenum wire furnace that pushes away boat continuously to carry out sintering the degreasing base, sintering temperature is 1270 ℃, and sintering time is 1 hour, promptly obtains Kovar alloy Package boxes.
Claims (2)
1. a method for preparing Kovar alloy Electronic Packaging box body prepares through the material powder, the feeding preparation, and injection moulding, degreasing, sintering circuit prepares the Electronic Packaging box body, it is characterized in that: concrete step of preparation process is as follows:
A, material powder preparation:, utilize high energy ball mill that the mixed-powder ball milling was obtained the alloy composite powder in 2～8 hours with iron, nickel, the cobalt powder ratio batching of Fe: Ni: Co=53～55: 29～31: 16～18 by weight percentage;
B, feeding preparation: alloy composite powder and binding agent are mixed into uniform feeding, useful load is 55～64%, the compound binding agent that described binding agent is made up of high density polyethylene (HDPE) 15～35 weight %, paraffin 60～80 weight % and stearic acid 3～15 weight %;
C, injection moulding: feeding is injection moulding on injector, and injection temperature is 150～170 ℃, and injection pressure is 90～110Mpa;
D, degreasing: the injection moulding base adopts the degreasing process of solvent degreasing and subsequent thermal degreasing, at first in trichloro-ethylene with injection moulding base solvent degreasing 2～6 hours, under 40～60 ℃ temperature dry 30～60 minutes then; Hot degreasing is carried out between room temperature～600 ℃, and the time is 6～8 hours;
E, sintering: obtain the degreasing base after the degreasing of injection moulding base, degreasing base sintering temperature of 1250～1280 ℃ in sintering furnace is incubated 1～3 hour, and sintered products obtains Package boxes through subsequent treatment.
2, according to the described method for preparing the Electronic Packaging box body of claim 1, it is characterized in that: alloy composite powder useful load preferable range is 58～62%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB031544797A CN1180908C (en) | 2003-09-30 | 2003-09-30 | Method for preparing Kovar alloy electronic package box |
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| CNB031544797A CN1180908C (en) | 2003-09-30 | 2003-09-30 | Method for preparing Kovar alloy electronic package box |
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| CN1491761A CN1491761A (en) | 2004-04-28 |
| CN1180908C true CN1180908C (en) | 2004-12-22 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102328074A (en) * | 2011-07-22 | 2012-01-25 | 浙江一火科技有限公司 | Hard alloy nozzle and manufacturing method thereof |
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| CN1309547C (en) * | 2005-05-08 | 2007-04-11 | 北京科技大学 | Method of preparing high size precision profiled molybdenum parts |
| CN100427244C (en) * | 2005-07-08 | 2008-10-22 | 台湾真珠乐器股份有限公司 | Musical instrument, musical instrument assembly preparation |
| CN100386167C (en) * | 2006-05-15 | 2008-05-07 | 北京创卓科技有限公司 | Micro injection process of forming soft magnetic Fe-Ni alloy |
| KR100768700B1 (en) * | 2006-06-28 | 2007-10-19 | 학교법인 포항공과대학교 | Fabrication method of alloy parts by metal injection molding and the alloy parts |
| 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 |
| CN102649160A (en) * | 2011-02-25 | 2012-08-29 | 山东金聚粉末冶金有限公司 | Junction box and manufacturing method thereof |
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| CN103240412B (en) * | 2013-05-22 | 2014-10-15 | 北京科技大学 | Method for preparing powder super-alloy by near net shape |
| 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 |
| CN108213409A (en) * | 2018-01-17 | 2018-06-29 | 河北中瓷电子科技有限公司 | The preparation method of kovar alloy wall used for electronic packaging |
| CN109877324B (en) * | 2019-03-19 | 2021-06-15 | 湖南恒基粉末科技有限责任公司 | Preparation method of kovar alloy packaging box body |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102328074A (en) * | 2011-07-22 | 2012-01-25 | 浙江一火科技有限公司 | Hard alloy nozzle and manufacturing method thereof |
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