CN101880807A - Production process capable of improving mechanical properties of high specific gravity tungsten alloy lever - Google Patents
Production process capable of improving mechanical properties of high specific gravity tungsten alloy lever Download PDFInfo
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- CN101880807A CN101880807A CN 201010197569 CN201010197569A CN101880807A CN 101880807 A CN101880807 A CN 101880807A CN 201010197569 CN201010197569 CN 201010197569 CN 201010197569 A CN201010197569 A CN 201010197569A CN 101880807 A CN101880807 A CN 101880807A
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Abstract
The invention relates to a production process capable of improving the mechanical properties of a high specific gravity tungsten alloy lever, which comprises the process procedures of material mixing, forming, forming agent removal, pre-burning and high-temperature liquid-phase sintering, wherein the process procedures of rotary swaging and aging are performed after the process procedures of material mixing, forming, forming agent removal, pre-burning and high-temperature liquid-phase sintering; the rotary swaging is realized by heating rods, which are sintered and obtained after the process procedures of material mixing, forming, forming agent removal, pre-burning and high-temperature liquid-phase sintering, to 200 to 400 DEG C, keeping the temperature of the rods for 0.5 to 1.5 hours, quickly placing the rods in a rotary swaging mold to perform cold forging to obtain rods of the same specifications; and the aging is realized by keeping the rods, which are rotationally swaged, at 200 to 600 DEG C for 1 to 3 hours. The production process effectively reduces the gaps in the alloy, improves the compactness of the alloy, reduces a large amount of misalignment appearing after deformation processing, improves the strength of the alloy and makes the microscopic structure of the alloy more uniform and the mechanical properties of the alloy more desirable. The method is high in efficiency, low in cost and high in material utilization rate and is suitable for batch production.
Description
Technical field
The present invention relates to a kind of production technique that improves high-specific gravity tungsten alloy pole stock mechanical property.
Background technology
Tungsten base high-specific-gravity alloy has higher density, intensity and hardness, good conductive and heat-conductive, corrosion-resistant, oxidation-resistance, and excellent mechanical property and use propertieies such as favorable mechanical processing and welding, at present, be widely used in aerospace, the military and civilian industry.
Traditional high-density alloy pole stock takes traditional powder metallurgy process to make, and promptly adopts following steps to carry out: (1) batch mixing: each component proportions according to required processing requirement takes by weighing a certain amount of W powder and other powdered alloy, places in the mixer to mix; (2) mix forming agent: with the powdered alloy that mixes, mix suitable paraffin binder, and paraffin binder is uniformly dispersed; (3) moulding: powder is put in the punching block of certain specification compression moulding; Or directly place under the soft mode of certain specification cold isostatic compaction again.(4) remove forming agent and pre-burning; (5) high-temperature liquid-phase sintering.And then add the vacuum heat treatment process, and follow-up machining just can obtain the pole stock of desired size.Adopt the pole stock that this explained hereafter comes out owing to limit by traditional technology, the alloy residual porosity is higher, and mechanical property is relatively poor.In order to improve alloy property, need thermal treatment repeatedly this moment, thereby cause in the lot production process, and cost increases, the prolongation at delivery date.Product size and finished product require size deviation big in addition, need follow-up machining, cause material use efficiency low.
Summary of the invention
Purpose of the present invention is exactly to be to provide a kind of a kind of production technique that improves high-specific gravity tungsten alloy pole stock mechanical property that overcomes defective in the prior art.
Technical scheme of the present invention realizes by following approach, it contains batch mixing, moulding, remove forming agent and pre-burning, the high-temperature liquid-phase sintering circuit, it is characterized in that it is at batch mixing, moulding, remove forming agent and pre-burning, the back of high-temperature liquid-phase sintering circuit has increased swages and the timeliness operation, concrete steps are as follows, swage: will be through batch mixing, moulding, remove forming agent and pre-burning, after the bar that the high-temperature liquid-phase sintering circuit sinters is heated to 200～400 ℃ earlier, be incubated 0.5-1.5 hour, place the mould of swaging to carry out cold forging rapidly, obtain the bar of certain specification.Timeliness: will be incubated under 200～600 ℃ temperature through the bar after swaging, timeliness is 1～3 hour.
The present invention swages+aging technique owing to having carried out, thereby reduce the hole in the alloy effectively, improve the alloy density, and reduce a large amount of dislocations that deformation processing back occurs, improve the intensity of alloy, make alloy have more uniform microstructure and better mechanical property.This method efficient height, cost is low, material use efficiency is high, is suitable for large batch of production.
Embodiment
Describe the specific embodiment of the present invention below in detail.
The present invention contains batch mixing, moulding, remove forming agent and pre-burning, the high-temperature liquid-phase sintering circuit, it is characterized in that it is to have increased in batch mixing, moulding, the back that removes forming agent and pre-burning, high-temperature liquid-phase sintering circuit to swage and the timeliness operation, and concrete steps are as follows:
Swage: will be through batch mixing, moulding, remove bar that forming agent and pre-burning, high-temperature liquid-phase sintering circuit sinter and be heated to 200～400 ℃ earlier after, be incubated 0.5-1.5 hour, place the mould of swaging to carry out cold forging then rapidly, obtain the bar of certain specification;
Timeliness: will be incubated under 200～600 ℃ temperature through the bar after swaging, timeliness is 1～3 hour.
Described deflection of swaging is 10-30%.
Several specific embodiments are described below.
Embodiment 1
Batch mixing: by the percentage composition requirement of alloy material fully of drawing up, tungsten and other powdered alloys are carried out weighing and burden, and 24 hours uniform mixing.
Mix forming agent: with the powdered alloy that mixes, mix suitable paraffin binder, oven dry is also crossed 40～80 eye mesh screens and is sieved;
Moulding: the powder of inciting somebody to action is put in the punching block of certain specification, the bar of compacting φ 38 under certain pressing pressure.
Remove forming agent and pre-burning: the bar that will be mixed with forming agent is placed under the hydrogen shield atmosphere, removes forming agent and pre-burning at a certain temperature.
High temperature sintering: will remove forming agent bar or etc. static pressure dry powder alloy bar material, place under the hydrogen shield, or under the vacuum state, under 1400～1580 ℃, carry out 1～6 hour high-temperature liquid-phase sintering.
Swage: the bar that will sinter φ 30 is heated to 300 ℃ earlier, is incubated 0.5-1.5 hour, places rapidly under the swager that is equipped with under certain specification mould or the type cavity mould then and swages, and just can obtain the bar of φ 22, and its deflection is 25%.
Timeliness: the bar after swaging places under 400 ℃ of temperature and is incubated, timeliness 2 hours.
Embodiment 2
Batch mixing: by the percentage composition requirement of alloy material fully of drawing up, tungsten and other powdered alloys are carried out weighing and burden, and 24 hours uniform mixing.
Mix forming agent: with the powdered alloy that mixes, mix suitable paraffin binder, oven dry is also crossed 40～80 eye mesh screens and is sieved;
Moulding: powder is put in the punching block of certain specification, under certain pressing pressure, is pressed into the bar of φ 24.6～25.8.
Remove forming agent and pre-burning: the bar that will be mixed with forming agent is placed under the hydrogen shield atmosphere, removes forming agent and pre-burning at a certain temperature.
High-temperature liquid-phase sintering:, place under the hydrogen shield, or under the vacuum state, under 1400～1580 ℃, carry out 1～6 hour high-temperature liquid-phase sintering with pre-burned bar.
Swage: φ 20～21 bars that sinter are heated to 200 ℃ earlier, are incubated 0.5-1.5 hour, place rapidly then and carry out cold forging under the swager that is equipped with under certain specification mould or the type cavity mould, just can obtain the bar of φ 16.Its deflection is 20%.
Timeliness: the bar after will swaging places under 300 ℃ of temperature and is incubated, timeliness 1 hour.
Embodiment 3
Batch mixing: by the percentage composition requirement of alloy material fully of drawing up, tungsten and other powdered alloys are carried out weighing and burden, and 24 hours uniform mixing.
Moulding: powder is directly placed under the soft mode of certain specification, isostatic cool pressing becomes the bar of φ 72 again.
Pre-burning: bar is placed under the hydrogen shield atmosphere pre-burning at a certain temperature.
High temperature sintering:, place under the hydrogen shield, or under the vacuum state, under 1400～1580 ℃, carry out the high-temperature liquid-phase sintering with pre-burned bar.
Swage: the bar of the φ 54 that sinters is heated to 400 ℃ earlier, is incubated 0.5-1.5 hour, place rapidly under the swager that is equipped with under certain specification mould or the type cavity mould then and swage, just can obtain the bar on 40 right sides of φ.
Timeliness: the bar after will swaging places under 500 ℃ of temperature and is incubated, timeliness 3 hours.
Embodiment 4
Batch mixing: by the percentage composition requirement of alloy material fully of drawing up, tungsten and other powdered alloys are carried out weighing and burden, and 24 hours uniform mixing.
Moulding: powder is directly placed under the soft mode of certain specification, isostatic cool pressing becomes the bar of φ 90 again.
Remove forming agent and pre-burning: bar is placed under the hydrogen shield atmosphere, removes forming agent and pre-burning at a certain temperature.
High-temperature liquid-phase sintering:, place under the hydrogen shield, or under the vacuum state, under 1400～1580 ℃, carry out 2 hours high-temperature liquid-phase sintering with pre-burned bar.
Swage: φ 75 bars that sinter are heated to 400 ℃ earlier, are incubated 0.5-1.5 hour, place rapidly under the swager that is equipped with under certain specification mould or the type cavity mould then and swage, just can obtain the bar of φ about 50.
Timeliness: the bar after will swaging places under 600 ℃ of temperature and is incubated, timeliness 3 hours.
Claims (2)
1. production technique that improves high-specific gravity tungsten alloy pole stock mechanical property, it contains batch mixing, moulding, remove forming agent and pre-burning, the high-temperature liquid-phase sintering circuit, it is characterized in that it is to have increased in batch mixing, moulding, the back that removes forming agent and pre-burning, high-temperature liquid-phase sintering circuit to swage and the timeliness operation, concrete steps are as follows:
Swage: will be through batch mixing, moulding, remove bar that forming agent and pre-burning, high-temperature liquid-phase sintering circuit sinter and be heated to 200～400 ℃ earlier after, be incubated 0.5-1.5 hour, place the mould of swaging to carry out cold forging rapidly, obtain the bar of certain specification;
Timeliness: will be incubated under 200～600 ℃ temperature through the bar after swaging, timeliness is 1～3 hour.
2. a kind of production technique that improves high-specific gravity tungsten alloy pole stock mechanical property according to claim 1 is characterized in that described deflection of swaging is 10-30%.
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| CN 201010197569 CN101880807A (en) | 2010-06-11 | 2010-06-11 | Production process capable of improving mechanical properties of high specific gravity tungsten alloy lever |
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| CN 201010197569 CN101880807A (en) | 2010-06-11 | 2010-06-11 | Production process capable of improving mechanical properties of high specific gravity tungsten alloy lever |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314973A (en) * | 2011-06-16 | 2012-01-11 | 重庆仪表材料研究所 | Armored cable preheated-type cold rotary forging device and forging method thereof |
| CN102717078A (en) * | 2012-05-10 | 2012-10-10 | 株洲乐泰金属粉末制品有限公司 | Process of tungsten alloy rotary swaging rod with high density and high performance |
| CN103170803A (en) * | 2013-03-07 | 2013-06-26 | 杭州新纪元安全产品有限公司 | Method of manufacturing rolling wheels of four-roller centrifugal machine on rock wool production line |
| CN108000060A (en) * | 2017-11-20 | 2018-05-08 | 南京理工大学 | A kind of multiple dimensioned preparation method for separating out isomery rods and bars of aluminium alloy |
| CN113263177A (en) * | 2021-04-15 | 2021-08-17 | 成都虹波实业股份有限公司 | Preparation method for improving large and small heads of tungsten alloy bars |
| CN113881881A (en) * | 2021-09-08 | 2022-01-04 | 华南理工大学 | High-strength high-specific gravity tungsten alloy material and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041556A (en) * | 1988-10-04 | 1990-04-25 | 冶金工业部包头稀土研究院 | Rare-earth tungsten electrode material and production method thereof |
-
2010
- 2010-06-11 CN CN 201010197569 patent/CN101880807A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1041556A (en) * | 1988-10-04 | 1990-04-25 | 冶金工业部包头稀土研究院 | Rare-earth tungsten electrode material and production method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 《Materials Science and Engineering A》 20081231 Boris Katavic et al. Investigation of the rotary swaging and heat treatment on the behavior of W- and gamma-phases in PM 92.5W-5Ni-2.5Fe-0.26Co heavy alloy 337-345 1-2 , 2 * |
| 《兵器材料科学与工程》 19980331 李志等 高比重钨合金的旋锻形变强化 56-59 1-2 第21卷, 第2期 2 * |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102314973A (en) * | 2011-06-16 | 2012-01-11 | 重庆仪表材料研究所 | Armored cable preheated-type cold rotary forging device and forging method thereof |
| CN102314973B (en) * | 2011-06-16 | 2016-08-17 | 重庆仪表材料研究所 | A kind of pre-heated cold rotation forging press of armored cable and forging method thereof |
| CN102717078A (en) * | 2012-05-10 | 2012-10-10 | 株洲乐泰金属粉末制品有限公司 | Process of tungsten alloy rotary swaging rod with high density and high performance |
| CN103170803A (en) * | 2013-03-07 | 2013-06-26 | 杭州新纪元安全产品有限公司 | Method of manufacturing rolling wheels of four-roller centrifugal machine on rock wool production line |
| CN103170803B (en) * | 2013-03-07 | 2016-01-27 | 杭州新纪元安全产品有限公司 | The preparation method of rock wool production line four roller centrifuge running roller |
| CN108000060A (en) * | 2017-11-20 | 2018-05-08 | 南京理工大学 | A kind of multiple dimensioned preparation method for separating out isomery rods and bars of aluminium alloy |
| CN113263177A (en) * | 2021-04-15 | 2021-08-17 | 成都虹波实业股份有限公司 | Preparation method for improving large and small heads of tungsten alloy bars |
| CN113881881A (en) * | 2021-09-08 | 2022-01-04 | 华南理工大学 | High-strength high-specific gravity tungsten alloy material and preparation method thereof |
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Open date: 20101110 |