CN104308168A - Preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder - Google Patents
Preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder Download PDFInfo
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- CN104308168A CN104308168A CN201410508081.6A CN201410508081A CN104308168A CN 104308168 A CN104308168 A CN 104308168A CN 201410508081 A CN201410508081 A CN 201410508081A CN 104308168 A CN104308168 A CN 104308168A
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Abstract
The invention provides a preparation method of fine particle size and low oxygen spherical titanium and titanium alloy powder. The preparation method comprises the following steps: forming molten titanium and titanium alloy liquid drops by adopting arc melting wires, then crushing the metal liquid drops into superfine fog drops by using supersonic speed airflows, and condensing the metal fog drops into the spherical titanium and titanium alloy powder under the surface tension effect of the fog drops. By adopting the arc melting wires, the spherical titanium and titanium alloy powder is prepared in a high-purity argon or helium spray atomization technology, so that the preparation method is short in technological process and low in energy consumption; moreover, the powder preparation process of melting and atomizing raw materials is carried out under the protection of an inert atmosphere, so that the high-activity titanium and titanium alloy powder can be effectively prevented from being polluted, and low oxygen and high purity of the prepared powder are guaranteed; in addition, the molten titanium and titanium alloy liquid drops are sufficiently atomized through three paths of supersonic speed airflows, so that the prepared powder is fine in particle size and higher in yield and has a higher practical value.
Description
Technical field
The invention belongs to powder metallurgy preparing technical field, be specifically related to the preparation method of a kind of fine grain hypoxemia spherical titanium and titanium alloy powder.
Background technology
Powder metallurgy is a kind of by powder straight forming, produces the near-net-shape technology of complicated shape part.It is short that PM technique has technological process, and stock utilization is high, and fine microstructures is even, the advantages such as isotropism, is the ideal technology of preparation high-performance, low cost titanium or titanium alloy.In recent years, the injection moulding of titanium or titanium alloy, the further exploitation increasing the emerging manufacture process technologies such as material manufacture and development, also promote that the application of powder metallurgy titanium or titanium alloy is expanded further.Wherein high-quality hypoxemia spherical titanium and titanium alloy powder are PM techniques, and especially emerging injection moulding, the critical materials increased in the process technologies such as material manufacture, determine the performance of powder metallurgy titanium or titanium alloy part and the expansion of application thereof.Because titanium is at high temperature to the high activity of oxygen, nitrogen, hydrogen, carbon, make to produce high-quality hypoxemia spherical titanium and titanium alloy powder difficulty is comparatively large, then yield is less to be applicable to injection moulding and fine grain spherical powder (≤45 μm) that some increases needed for manufacture process.The production status of high-quality fine grain titanium alloy powder limits further developing and extensive use of powder metallurgy titanium or titanium alloy technology to a certain extent.At present, the technology of large-scale production high-quality hypoxemia spherical titanium and titanium alloy powder mainly contains plasma rotating electrode powder-making technique and inert gas atomizer technology.Plasma rotating electrode powder-making technique passes through with high-temperature plasma arc melting High Rotation Speed titanium or titanium alloy bar front end, and rely on the dispersion of the centrifugal force of bar High Rotation Speed to throw away molten melt drop, molten melt drop relies on surface tension to be condensed into spherical powder again.Because the rotary speed of current bar is generally within 20000 revs/min, the centrifugal force of higher metal drop aerosol dispersion cannot be provided, so now with the titanium or titanium alloy powder prepared by this technology, its most powder particle granularity is all between 100 ~ 250 μm, and the powder of≤45 μm does not almost have.For inert gas atomizer technology, because titanium or titanium alloy presents activity extremely in high melt process, so fusing titanium or titanium alloy raw material mostly in a vacuum or inert atmosphere, adopt the induction melting mode of water jacketed copper crucible, or adopt the direct induction melting of metal bar material, these current flouring technology energy consumptions melting then aerosolization are higher, and cost is high, and the particulate of preparation is lower through the spherical titanium or titanium alloy yield of (≤45 μm).Above-mentioned defect, constrains further developing and extensive use of powder metallurgy titanium or titanium alloy technology, is therefore necessary to propose to improve.
Summary of the invention
The technical problem that the present invention solves: the preparation method that a kind of fine grain hypoxemia spherical titanium and titanium alloy powder are provided, electric arc fuse is adopted to form melting titanium or titanium alloy drop, then smash metal liquid stream with supersonic airstream and form ultra-fine droplet, under the effect of droplet surface tension force, the nodularization of metal droplet is condensed into spherical titanium and titanium alloy powder.
The technical solution used in the present invention: the preparation method of a kind of fine grain hypoxemia spherical titanium and titanium alloy powder, comprises following step:
1) titanium or titanium alloy ingot casting is made the titanium or titanium alloy silk material of diameter 1.5-3mm;
2) removal oxide on surface and impurity pretreatment are carried out to titanium or titanium alloy silk material;
3) wire feeder two titanium or titanium alloy silk materials being loaded arc pistol also accesses the both positive and negative polarity of power supply respectively;
4) first process is vacuumized to atomisation tower, and make its vacuum reach 1 × 10
-3-1 × 10
-2pa, then gives in atomisation tower and is filled with high-purity argon gas or helium and makes gas pressure remain on 0.1-1MPa;
5) arc pistol power supply is opened, two titanium or titanium alloy silk materials are sent to by wire feeder and makes both contacts produce arc-melting and form titanium or titanium alloy molten melt drop, then with high-purity high pressure argon gas or helium impact fusion titanium or titanium alloy drop powder by atomization;
6) carrying out separated and collected with cyclone separator to preparing powder, then carrying out sieve classification and Vacuum Package.
Above-mentioned steps 5) in, the arc current of titanium or titanium alloy silk material fusing is 150-200A.
Above-mentioned steps 5) in, four tunnels are had for high-purity high pressure argon gas of powder by atomization or helium gas jet, wherein three road argon gas or helium gas jet are all equipped with Laval nozzle, these three Laval nozzles circumference above molten melt drop is that 120 ° uniform and each Laval nozzle and vertical direction all become 25-35 ° of angle, and ensure that supersonic airstream and molten metal drop converge at a bit, air inlet air pressure 4-8Mpa, by the titanium or titanium alloy powder regulating admission pressure can prepare different grain size and size distribution, last road is positioned at directly over titanium or titanium alloy molten melt drop, distance molten melt drop 10-30mm, air inlet air pressure 0.01-0.5MPa, for molten metal drop is blown into supersonic airstream convergent point.
Further, the preferred titanium or titanium alloy parcel of described titanium or titanium alloy silk material.
Further, described titanium or titanium alloy silk material, the wire feeder of arc pistol, gas nozzle are all arranged in atomisation tower.
The present invention's advantage compared with prior art:
1, the present invention adopts electric arc fuse, and high-purity argon gas or helium spray atomization technology prepare spherical titanium and titanium alloy powder, and its technological process is short, and energy consumption is low;
2, raw materials melt powder by atomization flow process of the present invention is all implemented under inert atmosphere protection, high-activity titanium and titanium alloy powder can be effectively avoided to pollute, ensure the hypoxemia high-purity of prepared powder, and being fully atomized titanium or titanium alloy molten melt drop by 3 road supersonic airstreams, prepared particulate is higher through powder yield;
3, arc spraying atomization technique is this area routine techniques, the equipment adopted also is this area conventional equipment, but set up 3 tunnels and produce the Laval nozzle of supersonic airstream for abundant atomized molten drop, and for gas is accelerated to by subsonic speed the common practise that ultrasonic Laval nozzle is aerosolization technical field, process operability is strong.
Accompanying drawing explanation
Fig. 1 adopts the particulate of the embodiment of the present invention 1 preparation through the pattern photo of the spherical pure titanium powder of hypoxemia;
Fig. 2 adopts the particulate of the embodiment of the present invention 2 preparation through the pattern photo of the spherical Ti6Al4V alloy powder of hypoxemia.
Detailed description of the invention
Embodiment 1: the spherical pure titanium powder preparation method of fine grain of the present embodiment comprises the following steps:
1, the pure titanium ingot casting of high-cleanness, high is adopted to prepare the pure titanium parcel of 2mm diameter in the mode of machining;
2, pure titanium parcel surface scale or impurity is removed in chemical pickling mode, with alcohol washes decontamination and dry process;
3, the pure titanium silk material of two dishes is loaded the wire feeder of arc pistol, and access the both positive and negative polarity of power supply respectively;
4, first 2 × 10 are evacuated to atomisation tower
-3pa, is then filled with the high-purity argon gas of 0.4MPa.
5, arc pistol power supply is opened, adjustment arc current is 175A, the pure titanium silk material of two dishes is sent to by wire feeder and makes both contacts and produce arc-melting, be positioned at 15mm place gas circuit directly over titanium molten drop and air inlet air pressure 0.1MPa is set, molten titanium molten drop is blown into supersonic airstream convergent point, 3 Laval nozzles all become 30 ° of angles with vertical direction, arrange air inlet air pressure 5MPa, and the supersonic airstream of ejection high-purity argon gas smashes the pure titanium liquid stream of atomization.
6, separated and collected is carried out with cyclone separator to preparing powder, obtain spherical pure titanium powder, its integrated powder is relative to the oxygenation amount≤200ppm of raw material thread material, in powder≤powder of 45 μm of particle diameters reached for more than 15% (as shown in Figure 1), carries out sieve classification then Vacuum Package to this powder.
Embodiment 2: the particulate of the present embodiment comprises the following steps through the preparation method of spherical Ti6Al4V alloy powder
1, the Ti6Al4V alloy cast ingot of high-cleanness, high is adopted to prepare the Ti6Al4V alloy parcel of 2mm diameter in the mode of machining;
2, Ti6Al4V alloy parcel surface scale or impurity is removed in chemical pickling mode, with alcohol washes decontamination and dry process;
3, two dish Ti6Al4V alloy wires are loaded the wire feeder of arc pistol, and access the both positive and negative polarity of power supply respectively;
4, first 2 × 10 are evacuated to atomisation tower
-3pa, is then filled with high-purity helium of 0.4Mpa.
5, arc pistol power supply is opened, adjustment arc current is 170A, send two dish Ti6Al4V alloy wires to contact by wire feeder and produce arc-melting, be positioned at 15mm place gas circuit directly over Ti6Al4V molten alloy droplets and air inlet air pressure 0.1MPa is set, molten Ti 6Al4V molten alloy droplets is blown into supersonic airstream convergent point, 3 Laval nozzles all become 30 ° of angles with vertical direction, arrange air inlet air pressure 5.5MPa, and the supersonic airstream spraying high-purity helium smashes atomization Ti6Al4V aluminium alloy stream.
6, separated and collected is carried out with cyclone separator to preparing powder, obtain spherical Ti6Al4V alloy powder, its integrated powder is relative to the oxygenation amount≤200ppm of raw material thread material, in powder≤powder of 45 μm of particle diameters reached for more than 15% (as shown in Figure 2), carries out sieve classification then Vacuum Package to this powder.
Above-described embodiment, just preferred embodiment of the present invention, is not used for limiting the scope of the present invention, therefore all equivalence changes done with content described in the claims in the present invention, all should be included within the claims in the present invention scope.
Claims (5)
1. a preparation method for fine grain hypoxemia spherical titanium and titanium alloy powder, is characterized in that comprising following step:
1) titanium or titanium alloy ingot casting is made the titanium or titanium alloy silk material of diameter 1.5-3mm;
2) removal oxide on surface and impurity pretreatment are carried out to titanium or titanium alloy silk material;
3) wire feeder two titanium or titanium alloy silk materials being loaded arc pistol also accesses the both positive and negative polarity of power supply respectively;
4) first process is vacuumized to atomisation tower, and make its vacuum reach 1 × 10
-3-1 × 10
-2pa, then gives in atomisation tower and is filled with high-purity argon gas or helium and makes gas pressure remain on 0.1-1MPa;
5) arc pistol power supply is opened, two titanium or titanium alloy silk materials are sent to by wire feeder and makes both contacts produce arc-melting and form titanium or titanium alloy molten melt drop, then with high-purity high pressure argon gas or helium impact fusion titanium or titanium alloy drop powder by atomization;
6) carrying out separated and collected with cyclone separator to preparing powder, then carrying out sieve classification and Vacuum Package.
2. the preparation method of fine grain hypoxemia spherical titanium according to claim 1 and titanium alloy powder, is characterized in that: above-mentioned steps 5) in, the arc current of titanium or titanium alloy silk material fusing is 150-200A.
3. the preparation method of fine grain hypoxemia spherical titanium according to claim 1 and titanium alloy powder, it is characterized in that: above-mentioned steps 5) in, four tunnels are had for high-purity high pressure argon gas of powder by atomization or helium gas jet, wherein three road argon gas or helium gas jet are all equipped with Laval nozzle, these three Laval nozzles circumference above molten melt drop is that 120 ° uniform and each Laval nozzle and vertical direction all become 25-35 ° of angle, and ensure that supersonic airstream and molten metal drop converge at a bit, air inlet air pressure 4-8MPa, by the titanium or titanium alloy powder regulating admission pressure can prepare different grain size and size distribution, last road is positioned at directly over titanium or titanium alloy molten melt drop, distance molten melt drop 10-30mm, air inlet air pressure 0.01-0.5MPa, for molten metal drop is blown into supersonic airstream convergent point.
4. the preparation method of fine grain hypoxemia spherical titanium according to claim 1 and titanium alloy powder, is characterized in that: the preferred titanium or titanium alloy parcel of described titanium or titanium alloy silk material.
5. the preparation method of fine grain hypoxemia spherical titanium according to claim 1 and titanium alloy powder, is characterized in that: described titanium or titanium alloy silk material, the wire feeder of arc pistol, gas nozzle are all arranged in atomisation tower.
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105081337A (en) * | 2015-08-26 | 2015-11-25 | 宝鸡市博信金属材料有限公司 | Method and device for preparing fine spherical metal powder through high-frequency supersonic plasma gas |
| CN105855560A (en) * | 2016-05-27 | 2016-08-17 | 广州纳联材料科技有限公司 | Spherical metal powder and preparation method thereof |
| CN106392089A (en) * | 2016-09-27 | 2017-02-15 | 中航迈特粉冶科技（北京）有限公司 | Preparation method of aluminum alloy powder for additive manufacturing |
| CN107983374A (en) * | 2016-03-22 | 2018-05-04 | 湖州慧金材料科技有限公司 | The method that activity spherical cuprous chloride catalyst is prepared using atomized molten system |
| CN108237220A (en) * | 2016-12-27 | 2018-07-03 | 中国科学院宁波材料技术与工程研究所 | A kind of composite powder and its preparation method and application |
| CN108526472A (en) * | 2018-05-14 | 2018-09-14 | 宝鸡市新福泉机械科技发展有限责任公司 | A kind of free arc system for spherical metal powder device and method |
| CN108580913A (en) * | 2018-07-10 | 2018-09-28 | 深圳微纳增材技术有限公司 | A kind of 3D printing noble metal powder preparation method |
| CN109513945A (en) * | 2018-12-27 | 2019-03-26 | 北京康普锡威科技有限公司 | The preparation facilities of titanium or titanium alloy powder, preparation method and applications |
| CN110508826A (en) * | 2019-10-09 | 2019-11-29 | 自贡长城硬面材料有限公司 | A kind of efficient electric arc atomising device and a kind of method for preparing ultra-fine grain diameter metal alloy powders |
| CN113145855A (en) * | 2021-02-24 | 2021-07-23 | 山东大学 | Device and method for preparing high-melting-point alloy powder by electric arc |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619845A (en) * | 1985-02-22 | 1986-10-28 | The United States Of America As Represented By The Secretary Of The Navy | Method for generating fine sprays of molten metal for spray coating and powder making |
| US5084091A (en) * | 1989-11-09 | 1992-01-28 | Crucible Materials Corporation | Method for producing titanium particles |
| CN1270864A (en) * | 2000-04-26 | 2000-10-25 | 刘学晖 | Ultrasonic atomization of low-oxygen titanium with high-purity gas andtitanium alloy powder preparing process and product thereof |
| CN101391306A (en) * | 2008-11-20 | 2009-03-25 | 核工业西南物理研究院 | Globular titanium micro-powder or ultra-micro powder preparation device and method |
| CN102861919A (en) * | 2012-09-21 | 2013-01-09 | 徐广� | Plasma ultrasonic gas atomization titanium-based powder and preparation method thereof |
| CN103302296A (en) * | 2012-03-08 | 2013-09-18 | Fmw合成物系统公司 | Titanium powder production apparatus and method |
| CN103381484A (en) * | 2013-07-11 | 2013-11-06 | 中国科学院福建物质结构研究所 | Ti-based powder preparing device and Ti-based powder preparing method |
| CN103846447A (en) * | 2012-12-06 | 2014-06-11 | 北京有色金属研究总院 | Gas atomization preparation method of fine spherical titanium or titanium alloy powder |
-
2014
- 2014-09-28 CN CN201410508081.6A patent/CN104308168B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4619845A (en) * | 1985-02-22 | 1986-10-28 | The United States Of America As Represented By The Secretary Of The Navy | Method for generating fine sprays of molten metal for spray coating and powder making |
| US5084091A (en) * | 1989-11-09 | 1992-01-28 | Crucible Materials Corporation | Method for producing titanium particles |
| CN1270864A (en) * | 2000-04-26 | 2000-10-25 | 刘学晖 | Ultrasonic atomization of low-oxygen titanium with high-purity gas andtitanium alloy powder preparing process and product thereof |
| CN101391306A (en) * | 2008-11-20 | 2009-03-25 | 核工业西南物理研究院 | Globular titanium micro-powder or ultra-micro powder preparation device and method |
| CN103302296A (en) * | 2012-03-08 | 2013-09-18 | Fmw合成物系统公司 | Titanium powder production apparatus and method |
| CN102861919A (en) * | 2012-09-21 | 2013-01-09 | 徐广� | Plasma ultrasonic gas atomization titanium-based powder and preparation method thereof |
| CN103846447A (en) * | 2012-12-06 | 2014-06-11 | 北京有色金属研究总院 | Gas atomization preparation method of fine spherical titanium or titanium alloy powder |
| CN103381484A (en) * | 2013-07-11 | 2013-11-06 | 中国科学院福建物质结构研究所 | Ti-based powder preparing device and Ti-based powder preparing method |
Cited By (12)
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|---|---|---|---|---|
| CN105081337A (en) * | 2015-08-26 | 2015-11-25 | 宝鸡市博信金属材料有限公司 | Method and device for preparing fine spherical metal powder through high-frequency supersonic plasma gas |
| CN107983374A (en) * | 2016-03-22 | 2018-05-04 | 湖州慧金材料科技有限公司 | The method that activity spherical cuprous chloride catalyst is prepared using atomized molten system |
| CN105855560A (en) * | 2016-05-27 | 2016-08-17 | 广州纳联材料科技有限公司 | Spherical metal powder and preparation method thereof |
| CN105855560B (en) * | 2016-05-27 | 2019-02-26 | 广州纳联材料科技有限公司 | Globular metallic powder and preparation method thereof |
| CN106392089A (en) * | 2016-09-27 | 2017-02-15 | 中航迈特粉冶科技（北京）有限公司 | Preparation method of aluminum alloy powder for additive manufacturing |
| CN108237220A (en) * | 2016-12-27 | 2018-07-03 | 中国科学院宁波材料技术与工程研究所 | A kind of composite powder and its preparation method and application |
| CN108526472A (en) * | 2018-05-14 | 2018-09-14 | 宝鸡市新福泉机械科技发展有限责任公司 | A kind of free arc system for spherical metal powder device and method |
| CN108580913A (en) * | 2018-07-10 | 2018-09-28 | 深圳微纳增材技术有限公司 | A kind of 3D printing noble metal powder preparation method |
| CN109513945A (en) * | 2018-12-27 | 2019-03-26 | 北京康普锡威科技有限公司 | The preparation facilities of titanium or titanium alloy powder, preparation method and applications |
| CN110508826A (en) * | 2019-10-09 | 2019-11-29 | 自贡长城硬面材料有限公司 | A kind of efficient electric arc atomising device and a kind of method for preparing ultra-fine grain diameter metal alloy powders |
| CN113145855A (en) * | 2021-02-24 | 2021-07-23 | 山东大学 | Device and method for preparing high-melting-point alloy powder by electric arc |
| CN113145855B (en) * | 2021-02-24 | 2022-10-11 | 山东大学 | Device and method for preparing high-melting-point alloy powder through electric arc |
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