CN104357783A - Titanium-aluminum alloy powder material for thermal spraying and preparation method thereof - Google Patents
Titanium-aluminum alloy powder material for thermal spraying and preparation method thereof Download PDFInfo
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- CN104357783A CN104357783A CN201410557638.5A CN201410557638A CN104357783A CN 104357783 A CN104357783 A CN 104357783A CN 201410557638 A CN201410557638 A CN 201410557638A CN 104357783 A CN104357783 A CN 104357783A
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C4/00—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge
- C23C4/04—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the coating material
- C23C4/06—Metallic material
- C23C4/08—Metallic material containing only metal elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F9/00—Making metallic powder or suspensions thereof
- B22F9/02—Making metallic powder or suspensions thereof using physical processes
- B22F9/06—Making metallic powder or suspensions thereof using physical processes starting from liquid material
- B22F9/08—Making metallic powder or suspensions thereof using physical processes starting from liquid material by casting, e.g. through sieves or in water, by atomising or spraying
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C14/00—Alloys based on titanium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C30/00—Alloys containing less than 50% by weight of each constituent
Abstract
A titanium-aluminum alloy powder material for thermal spraying and a preparation method thereof can be used for different thermal spraying technologies. The preparation method of the powder material comprises the following steps: taking gamma-TiAl alloy as a matrix, separately and compositely adding Nb, Cr and V alloy elements, adopting a vacuum consumable arc-melting furnace to prepare a mother alloy ingot of the titanium-aluminum alloy, and utilizing a gas atomization method to realize preparation of the gamma-TiAl alloy powder containing the metastable beta phase, so as to improve the phase composition of the powder material. The novel gamma-TiAl based alloy powder material mainly comprises the phase components of gamma phase, beta phase and alpha2 phase; the powder is free of oxidation phase and nitridation phase and is good in degree of sphericity.
Description
Technical field
The present invention relates to used for hot spraying containing metastable β phase titanium aluminium base alloy powder material and preparation method thereof.
Background technology
Thermospray is a kind of important surface engineering technology, it is the important means improving material surface performance, the functional coatings such as anticorrosion, wear-resisting, heat insulation, conduction, insulation, sealing can be prepared by hot-spraying techniques, be widely used in the production such as aerospace, automotive industry, information technology, optical engineering and manufacturing again.
Titanium aluminum binary series intermetallic compound, density circle is between pure titanium and fine aluminium.It has the general characteristic of intermetallic compound, not only there is metallic bond between atom, there is covalent linkage simultaneously, and atom and Binding Forces Between Atoms strengthen, and chemical bond tends towards stability.Therefore, titanium-aluminium alloy belong between the corrosion resistance nature of compound and crocking resistance all higher than general titanium alloy.Wherein, γ-TiAl intermetallic compound is as a kind of novel light structured material, because having the advantages such as high specific strength, high specific stiffness, anti-corrosion, wear-resisting, high temperature resistant and excellent antioxidant property, become one of the good candidates structured material in the fields such as contemporary aerospace industry, civilian industry.
But, in gamma-TiAl alloy, covalent linkage accounts for 30 ~ 40%, metallic bond accounts for 60 ~ 70%, because covalent linkage proportion result in more greatly the fragility of alloy, cause single-phase gamma-TiAl alloy just to have fracture tendency in the temperature-room type plasticity tension strain of 0.5% ~ 1%, this fragility is main relevant with the structure of material itself.Because gamma-TiAl alloy plastic deformation ability is poor, be difficult to deposition formation, be difficult to be prepared as coatings applications in the surfacecti proteon of material.
In γ-TiAl-base alloy, metastable β phase (or B2 phase) can be introduced by adding β phase stable element as Cr, V, Nb, Mo, W etc. or by machining deformation.γ-TiAl-base alloy containing metastable β phase has better plasticity.Research finds, β phase (or B2) in γ-TiAl-base alloy is a kind of soft phase mutually, it is this that soft be often wrapped in γ phase when superplastic deformation peripheral, or expand along γ phase boundary, contribute to strengthening the anti-unsticking ability between interface and compatible deformation ability, the plasticity of γ-TiAl-base alloy can be made to be improved.But, because titanium aluminum alloy powder body material exploitation used for hot spraying is delayed, the problem that titanium aluminum coating ubiquity foreign matter content is high, coating quality is low of preparation.Current research shows, is not applicable to high purity titanium aluminium alloy powder body material used for hot spraying.
Summary of the invention
The object of the invention is to provide titanium aluminum alloy powder body material used for hot spraying and preparation method thereof, obtains the γ-TiAl base powder body material that can be used for thermal spray deposition shaping containing metastable β phase (or B2 phase).
The powder body material containing metastable β phase (or B2 phase) gamma-TiAl alloy that the present invention relates to, it has following composition (atomic ratio):
(1)Ti-45Al-7Nb-4V；
(2)Ti-45Al-7Nb-4Cr；
(3)Ti-45Al-7Nb-2V-2Cr。
The powder body material containing β phase (or B2 phase) γ-TiAl-base alloy that the present invention relates to, it has one of following thing phase composite:
(1) in Ti-45Al-7Nb-4V alloy powder, γ-TiAl phase content is 65wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 30wt.%, β-Ti phase content is 3wt.% ~ 6wt.%;
(2) in Ti-45Al-7Nb-4Cr alloy powder, γ-TiAl phase content is 80wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 15wt.%, β-Ti phase content is 4wt.% ~ 7wt.%;
(3) in Ti-45Al-7Nb-2V-2Cr alloy powder, γ-TiAl phase content is 90wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 5wt.%, β-Ti phase content is 5wt.% ~ 10wt.%.
The thermospray that the present invention relates to is as follows containing the preparation process of metastable β phase (or B2 phase) γ-TiAl-base alloy powder body material:
(1) adopt vacuum consumable arc-melting stove to prepare γ-TiAl-base alloy mother alloy, concrete steps are as follows:
1) by purity be more than 99.9% Ti rod, Al grain and master alloy AlNb, AlV, AlCr carry out proportioning by atomic ratio Ti-45Al-7Nb-4V, Ti-45Al-7Nb-4Cr and Ti-45Al-7Nb-2V-2Cr respectively;
2) starting material prepared are compressed to consumable electrode;
3) in vacuum consumable arc-melting stove, carry out three times homogenizing meltings and prepare mother alloy, processing parameter is electric current 5 ~ 8kA, voltage 24 ~ 40V, first vacuumize 6 × 10
-2pa, fusion process passes into argon shield, each melting soaking time 10min.
(2) adopt aerosolizing device preparation containing metastable β phase γ-TiAl-base alloy powder body material
1) γ-TiAl base mother alloy ingot step one prepared puts into the induction furnace of aerosolizing device, is evacuated to 10
-2pa;
2) ruhmkorff coil is utilized γ-TiAl base mother alloy to be heated to fusing, heating power 40 ~ 50kw, soaking time 20min;
3) make the γ-TiAl base mother alloy after fusing by furnace bottom aperture, form the metal liquid stream of 4 ~ 6mm diameter, pass into high pressure argon gas by ring nozzle and smash metal liquid stream formation dispersed powders, argon pressure 8 ~ 12MPa, finally obtains containing metastable β phase γ-TiAl-base alloy powder body material.
The present invention optimizes γ-TiAl-base alloy powder Microstructure and properties further, homogeneous microstructure, sphericity is high, good fluidity, oxygen and nitrogen content are low γ-TiAl-base alloy powder body material can be prepared, the powder body material of different grain size distribution can be obtained simultaneously, can be used for the deposition formation of different hot-spraying techniques, expand the range of application of titanium aluminum alloy.
The effect that the present invention is useful: take gamma-TiAl alloy as matrix, Nb, Cr, V alloy element is added by independent and compound, and adopt aerosolization method to realize preparing containing the gamma-TiAl alloy powder body material of metastable β phase, realize the object improving powder body material phase composite, mechanical property.
Accompanying drawing explanation
Fig. 1 is present invention process schema.
Fig. 2 is that the titanium aluminum alloy as-cast structure SEM of embodiment one schemes.
Fig. 3 is the titanium aluminum alloy powder microscopic appearance figure of embodiment one.
Fig. 4 is the different-grain diameter titanium aluminum alloy elastic modulus figure of embodiment one.
Fig. 5 is the titanium aluminum alloy powder metallographic structure figure of embodiment two.
Fig. 6 is the XRD figure of the titanium aluminum alloy powder body material of embodiment two.
Fig. 7 is the different-grain diameter titanium aluminum alloy elastic modulus figure of embodiment two.
Fig. 8 is the titanium aluminum alloy powder granularity distribution plan of embodiment three.
Fig. 9 is the different-grain diameter titanium aluminum alloy elastic modulus figure of embodiment three.
Embodiment
The present invention is realized by following measures:
Embodiment one:
1) by purity be more than 99.9% Ti rod, Al grain and master alloy AlNb, AlV carry out proportioning by atomic ratio Ti-45Al-7Nb-4V, the starting material prepared are compressed to consumable electrode, in vacuum consumable arc-melting stove, carry out three homogenizing meltings prepare Ti-45Al-7Nb-4V mother alloy ingot, the microtexture of titanium aluminum alloy ingot casting as shown in Figure 2, β phase is separated out at grain boundaries, as shown by arrows in FIG..Mother alloy melting technology parameter is: electric current 6kA, voltage 30V, first vacuumize 6 × 10
-2pa, fusion process passes into argon shield, each melting soaking time 10min.
2) γ-TiAl base mother alloy ingot step one prepared puts into the induction furnace of aerosolizing device, is evacuated to 10
-2pa; Ruhmkorff coil is utilized γ-TiAl base mother alloy to be heated to fusing, heating power 50kw, soaking time 20min; Make the γ-TiAl base mother alloy after fusing by furnace bottom aperture, form the metal liquid stream of 5mm diameter, pass into high pressure argon gas by ring nozzle and smash metal liquid stream formation dispersed powders, argon pressure 9MPa, finally obtains containing metastable β phase γ-TiAl-base alloy powder body material.Be illustrated in figure 3 the microscopic appearance figure of titanium aluminum alloy powder, as can be seen from the figure, titanium aluminum alloy powder sphericity is better, is conducive to improving powder fluidity, Fig. 4 is different-grain diameter titanium aluminum alloy elastic modulus figure, and elastic modulus increases with diameter of particle and increases.
Embodiment two:
1) by purity be more than 99.9% Ti rod, Al grain and master alloy AlNb, AlCr carry out proportioning by atomic ratio Ti-45Al-7Nb-4Cr, the starting material prepared are compressed to consumable electrode, in vacuum consumable arc-melting stove, carry out three homogenizing meltings prepare Ti-45Al-7Nb-4Cr mother alloy ingot, processing parameter is electric current 5kA, voltage 40V, first vacuumize 6 × 10
-2pa, fusion process passes into argon shield, each melting soaking time 10min.
2) γ-TiAl base mother alloy ingot step one prepared puts into the induction furnace of aerosolizing device, is evacuated to 10
-2pa; Ruhmkorff coil is utilized γ-TiAl base mother alloy to be heated to fusing, heating power 45kw, soaking time 20min; Make the γ-TiAl base mother alloy after fusing by furnace bottom aperture, form the metal liquid stream of 6mm diameter, pass into high pressure argon gas by ring nozzle and smash metal liquid stream formation dispersed powders, argon pressure 10MPa, finally obtains containing metastable β phase γ-TiAl-base alloy powder body material.Fig. 5 is the metallographic structure that titanium aluminum alloy powder throws face, and as can be seen from Figure, powder is organized as tiny column crystal.Figure 6 shows that different-grain diameter scope titanium aluminum alloy powder XRD diffracting spectrum, can find out that powder is primarily of γ phase, β phase (B2 phase) and α by test result
2phase composite, non-oxidation phase and nitrogenize phase in powder.Fig. 7 is different-grain diameter titanium aluminum alloy elastic modulus figure, and elastic modulus increases with diameter of particle and increases.
Embodiment three:
1) by purity be more than 99.9% Ti rod, Al grain and master alloy AlNb, AlCr, AlV carry out proportioning by atomic ratio Ti-45Al-7Nb-2V-2Cr, the starting material prepared are compressed to consumable electrode, in vacuum consumable arc-melting stove, carry out three homogenizing meltings prepare Ti-45Al-7Nb-2V-2Cr mother alloy ingot, processing parameter is electric current 8kA, voltage 28V, first vacuumize 6 × 10
-2pa, fusion process passes into argon shield, each melting soaking time 10min.
2) γ-TiAl base mother alloy ingot step one prepared puts into the induction furnace of aerosolizing device, is evacuated to 10
-2pa; Ruhmkorff coil is utilized γ-TiAl base mother alloy to be heated to fusing, heating power 40kw, soaking time 20min; Make the γ-TiAl base mother alloy after fusing by furnace bottom aperture, form the metal liquid stream of 4mm diameter, pass into high pressure argon gas by ring nozzle and smash metal liquid stream formation dispersed powders, argon pressure 8MPa, finally obtains containing metastable β phase γ-TiAl-base alloy powder body material.Figure 8 shows that the particle size distribution range adopting method of sieving to record titanium aluminum alloy powder.Fig. 9 is different-grain diameter titanium aluminum alloy elastic modulus figure, and elastic modulus increases with diameter of particle and increases.
Claims (3)
1. titanium aluminum alloy powder body material used for hot spraying, it is characterized in that having following atom composition: Ti-45Al-7Nb-4V, or Ti-45Al-7Nb-4Cr, or Ti-45Al-7Nb-2V-2Cr, described powder body material is containing γ-TiAl phase and β-Ti phase.
2. titanium aluminum alloy powder body material used for hot spraying according to claim 1, is characterized in that: in Ti-45Al-7Nb-4V alloy powder, γ-TiAl phase content is 65wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 30wt.%, β-Ti phase content is 3wt.% ~ 6wt.%; In Ti-45Al-7Nb-4Cr alloy powder, γ-TiAl phase content is 80wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 15wt.%, β-Ti phase content is 4wt.% ~ 7wt.%; In Ti-45Al-7Nb-2V-2Cr alloy powder, γ-TiAl phase content is 90wt.% ~ 95wt.%, α
2-Ti
3al phase content is 0wt.% ~ 5wt.%, β-Ti phase content is 5wt.% ~ 10wt.%.
3. the preparation method of titanium aluminum alloy powder body material used for hot spraying according to claim 1, is characterized in that carrying out according to the following steps:
(1) adopt vacuum consumable arc-melting stove to prepare alloy mother alloy, concrete steps are as follows:
1) by purity be more than 99.9% Ti rod, Al grain and master alloy AlNb, AlV, AlCr carry out proportioning by atomic ratio Ti-45Al-7Nb-4V, Ti-45Al-7Nb-4Cr and Ti-45Al-7Nb-2V-2Cr respectively;
2) starting material prepared are compressed to consumable electrode;
3) in vacuum consumable arc-melting stove, carry out three times homogenizing meltings and prepare mother alloy, processing parameter is electric current 5 ~ 8kA, voltage 24 ~ 40V, first vacuumize 6 × 10
-2pa, fusion process passes into argon shield, each melting soaking time 10min;
(2) adopt aerosolizing device preparation containing metastable β phase γ-TiAl-base alloy powder body material:
1) γ-TiAl base mother alloy ingot step one prepared puts into the induction furnace of aerosolizing device, is evacuated to 10
-2pa;
2) ruhmkorff coil is utilized γ-TiAl base mother alloy to be heated to fusing, heating power 40 ~ 50kw, soaking time 20min;
3) make the γ-TiAl base mother alloy after fusing by furnace bottom aperture, form the metal liquid stream of 4 ~ 6mm diameter, pass into high pressure argon gas by ring nozzle and smash metal liquid stream formation dispersed powders, argon pressure 8 ~ 12MPa, finally obtains containing metastable β phase γ-TiAl-base alloy powder body material.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048497A (en) * | 2016-07-22 | 2016-10-26 | 中国人民解放军装甲兵工程学院 | Abrasion resisting coating with high gamma-TiAl phase content and preparing method of abrasion resisting coating |
| CN106735280A (en) * | 2016-11-23 | 2017-05-31 | 西北有色金属研究院 | A kind of preparation method of spherical TiTa alloy powders |
| CN111702181A (en) * | 2020-08-04 | 2020-09-25 | 盘星新型合金材料(常州)有限公司 | Preparation method of titanium-aluminum alloy powder, titanium-aluminum alloy powder and application |
| CN113492213A (en) * | 2021-09-07 | 2021-10-12 | 西安欧中材料科技有限公司 | Preparation method and equipment of high-sphericity low-oxygen-content TiAl alloy powder |
| CN113927038A (en) * | 2021-10-14 | 2022-01-14 | 广东省科学院新材料研究所 | TiAl alloy powder for 3D printing and preparation method thereof |
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| EP1033726A1 (en) * | 1998-09-22 | 2000-09-06 | The Furukawa Electric Co., Ltd. | Method for producing aluminum-stabilized super conductive wire |
| CN102672150A (en) * | 2012-05-14 | 2012-09-19 | 北京科技大学 | Direct control method for titanium-aluminum-niobium alloy lamellar structure |
| CN103572082A (en) * | 2013-11-18 | 2014-02-12 | 北京科技大学 | High Nb-TiAl alloy and preparation method thereof |
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2014
- 2014-10-20 CN CN201410557638.5A patent/CN104357783B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1033726A1 (en) * | 1998-09-22 | 2000-09-06 | The Furukawa Electric Co., Ltd. | Method for producing aluminum-stabilized super conductive wire |
| CN102672150A (en) * | 2012-05-14 | 2012-09-19 | 北京科技大学 | Direct control method for titanium-aluminum-niobium alloy lamellar structure |
| CN103572082A (en) * | 2013-11-18 | 2014-02-12 | 北京科技大学 | High Nb-TiAl alloy and preparation method thereof |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106048497A (en) * | 2016-07-22 | 2016-10-26 | 中国人民解放军装甲兵工程学院 | Abrasion resisting coating with high gamma-TiAl phase content and preparing method of abrasion resisting coating |
| CN106735280A (en) * | 2016-11-23 | 2017-05-31 | 西北有色金属研究院 | A kind of preparation method of spherical TiTa alloy powders |
| CN111702181A (en) * | 2020-08-04 | 2020-09-25 | 盘星新型合金材料(常州)有限公司 | Preparation method of titanium-aluminum alloy powder, titanium-aluminum alloy powder and application |
| CN113492213A (en) * | 2021-09-07 | 2021-10-12 | 西安欧中材料科技有限公司 | Preparation method and equipment of high-sphericity low-oxygen-content TiAl alloy powder |
| CN113927038A (en) * | 2021-10-14 | 2022-01-14 | 广东省科学院新材料研究所 | TiAl alloy powder for 3D printing and preparation method thereof |
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