CN102303117A - Method for preparing porous heat exchange surface of TiAl-based intermetallic compound - Google Patents
Method for preparing porous heat exchange surface of TiAl-based intermetallic compound Download PDFInfo
- Publication number
- CN102303117A CN102303117A CN201110249709A CN201110249709A CN102303117A CN 102303117 A CN102303117 A CN 102303117A CN 201110249709 A CN201110249709 A CN 201110249709A CN 201110249709 A CN201110249709 A CN 201110249709A CN 102303117 A CN102303117 A CN 102303117A
- Authority
- CN
- China
- Prior art keywords
- powder
- tial
- pure
- spraying
- cold
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Landscapes
- Powder Metallurgy (AREA)
Abstract
The invention relates to a method for preparing a porous heat exchange surface of a TiAl-based intermetallic compound, and belongs to the technical field of intermetallic compounds. The method comprises the following steps of: (1), mixing 43 to 50 atom percent of Ti powder, 0 to 10 atom percent of Al powder and the balance of Nb powder, and drying the powder to prepare cold spraying powder; (2), polishing and cleaning a metal substrate, and depositing the cold spraying powder on the metal substrate at one time; and (3), performing vacuum heat preservation and sintering by using a three-step sintering process again, and thus preparing a TiAl-based alloy porous layer on the metal substrate. The invention has the advantages that: mixed metal powder can be directly sprayed on the outer surface of a metal plate (pipe), and the method is simple, high in efficiency and suitable for mass production of heat exchange plates (pipes); the prepared TiAl-based porous coating layer has a uniform thickness and uniform pores, and is firm, difficult to fall off, and applicable for plate-type or pipe-type heat exchanges of the fields such as chemical industry, petroleum, metallurgy, sea water desalinization, high-temperature heat exchange and the like.
Description
Technical field
The invention belongs to the intermetallic compound technical field, the preparation method on a kind of titanium aluminum based metal compound porous heat transfer surface particularly is provided, relate to heat transfer technology.Specifically be to combine cold spraying and powder metallurgical sintering process to prepare the method for TiAl base intermetallic compound porous outer surface layer.
Background technology
At present, in the heat transfer technology field, people come augmentation of heat transfer through changing heat exchange surface structure and specially treated heat exchange surface, and porous surface has caused concern widely owing to have the heat-transfer mechanism and the heat transfer property of uniqueness.Mechanism based on the porous enhanced boiling heat transfer; The heat transfer coefficient of the comparable common light pipe of heat transfer coefficient of slug type porous surface tube improves 10 times at least; And its effective temperature difference only is 1/7～1/8 of a common light pipe, and common light pipe can effectively improve the resistive connection dirt performance of light pipe after sintering is processed porous surface tube.In addition, in the technology of preparation light pipe porous surface coating, the porous coating of chemical attack and flame-spraying preparation, cost is high, and coating instability and thickness and porosity are wayward; The porous coating of mechanical processing method preparation can't process very little hole, and the technology relative complex, and porous surface layer aperture is inhomogeneous; Replicability poor (Liu Along, Xu Hong etc.; The heat exchanger Summarization of sintered surface porous tubes, petrochemical equipment [J]. 2005, (34) 1:47-49); The porous coating of common coating sintering method preparation is easy to cracking, peels off (Liu Along, Xu Hong etc., porous surface heat exchanger tube fouling characteristic research present situation, petroleum machinery [J] .2008, (36) 5:61-65); Traditional heat exchangers adopts stainless steel, nickel alloy, monel metal and albronze usually; Reason owing to material; Dirt is deposited on easily thermal resistance is increased; Cause heat transfer property decline (Ma Xiaochi; Domestic and international new type high efficient heat exchanger; Chemical industry progress [J]. 2001,1:49-51 [3]).Shortcoming based on above-mentioned preparation method; We propose to combine the method for cold spraying and vacuum-sintering; Based on the pore-creating of Kirkendall effect; On pure Ti, TiAl alloy sheets (pipe), prepare the intermetallic compound porous coating of the controlled TiAl of layer of even, controlled porosity and coating layer thickness; Because corrosion-resistant, the high-temperature stability of inter-metallic compound material, can adopt the mode of high temperature sintering or pickling to prevent the generation of fouling.
Summary of the invention
The object of the present invention is to provide the preparation method on a kind of TiAl base intermetallic compound porous heat transfer surface.Adopt the preparation enhanced heat exchange porous coating that this method can more convenient and quicker, the porous coating of preparing has tiny and uniform micron order (1 μ m ~ 100 μ m) aperture, and porosity can reach 20% ~ 40%, and porous coating and matrix can produce good binding.
The technical scheme that the present invention adopts is:
1) with Ti powder, Al powder and Nb powder according to atomic percent (Ti-(43 ~ 50) Al-(0～10) Nb at.%) batching, then each powder is put into the V-type batch mixer and was mixed 5～8 hours, take out after the powder for drying as cold-spraying sediment powder.
2) mixing cold-spraying sediment powder that step (1) is prepared places the dusting device of reaction-injection moulding machine; Pure Ti or TiAl alloy substrate are polished; Carrying out ultrasonic waves for cleaning again handles; Then cold-spraying sediment powder is adopted disposable the depositing on pure Ti or the TiAl alloy substrate of mode of cold spraying; Cold spray operating temperature is 300～500 ℃, adopts the spraying of nitrogen or argon gas atmosphere.
3) sample in the step (2) is placed vacuum sintering furnace, adopt three stage sintering process: the first step is at 120～150 ℃ of insulation 30～60min; Second step was warming up to 550～600 ℃ of insulation 120～180min; The 3rd step was warming up to 1300～1400 ℃ of insulation 180～300min.After the vacuum heat-preserving sintering process,, on pure Ti, TiAl alloy substrate, make layer of even TiAl base intermetallic compound porous coating with the stove cooling.
The granularity of said Ti powder is 25 μ m～150 μ m, and the granularity of Al powder is 25 μ m～150 μ m, and the granularity of Nb powder is less than 25 μ m.
Said pure Ti or TiAl alloy substrate are polished to 1500# sand paper.
Said pure Ti or TiAl alloy substrate are sheet material or tubing.
Compared with prior art, characteristics of the present invention are:
(1) the intermetallic compound porous coating of preparing has the little (3.9g/cm of TiAl base intermetallic compound density
3~ 4.2g/cm
3), excellent (porosity is 37.02% o'clock to mechanical property; Room temperature tensile intensity can reach 175MPa) and antioxygenic property excellent (can at 800 ℃ of long-term resistance to high temperature oxidation); Characteristics such as acid-alkali-corrosive-resisting property is strong; So can be used for special Service Environment, like the heat exchange of desalinization, special heat transferring medium and be used for industry fields such as chemistry, oil, solvent, medicine, food, light industry, weaving, metallurgy, steel rolling, coking.
The stephanoporate framework of hole, the TiAl Quito coating of (2) preparing has the two phase lamellar structures that traditional titanium aluminium base alloy has, γ-TiAl/ α
2-Ti
3The Al lamellar structure, porous nickel, the aperture is normal distribution.
(3) adopt cold spraying and vacuum-sintering mode to prepare hole, TiAl Quito coating, can be through regulating the pore-size distribution of the gentle pressure-controlled material of powder diameter, to be suitable for different application requirements.The porous coating that adopts this kind mode to prepare combines well with metallic matrix.
(4) because hole, TiAl Quito coating; Be to utilize the inclined to one side diffusion between Ti and the Al and pore-creating need not added any pore creating material, and mixed metal powder can be painted on pure Ti, TiAl alloy sheets (pipe) outer surface; One-shot forming in the cold spray process; Do not have any pollution, thereby avoided traditional pore creating material link, energy savings of removing; Simple to operate; Convenient, efficiently, be suitable for producing in enormous quantities the porous coating of heat exchanger.
Description of drawings
Fig. 1 is TiAl base intermetallic compound porous layer preparation technology figure
Fig. 2 is TiAl base intermetallic compound porous layer microscopic cross figure
Fig. 3 is TiAl base intermetallic compound porous layer γ-TiAl/ α
2-Ti
3Al lamellar structure shape appearance figure.
The specific embodiment
Embodiment 1: adopt granularity to be Ti powder and the Al powder of 75 ~ 150 μ m, granularity is the Nb powder of 5 ~ 25 μ m, carries out proportioning by Ti-43Al-6Nb (at.%) composition, puts into the V-type batch mixer and mixes 7 hours.After mixing, fully dry to obtain cold-spraying sediment powder under vacuum.Ti-48Al-6Nb (at.%) substrate is carried out sand papering to 1500# sand paper, carry out ultrasonic waves for cleaning, dried again.Subsequently powder is placed reaction-injection moulding equipment, adopt nitrogen atmosphere, the nitrogen heating-up temperature is 400 ℃, and spray gun and Ti-48Al-6Nb (at.%) substrate distance is 15mm, and the relative substrate translational speed of spray gun is 500mm/min, and its fundamental diagram is seen Fig. 1.Spraying finishes and can obtain the TiAl-Nb powder coating that one deck is close to densification, and this sample is placed vacuum reaction stove sintering.Sintering adopts three elementary reaction synthesis techniques, vacuum atmosphere, and vacuum degree control is 1 * 10
-2~ 1 * 10
-3Pa.Degassing temperature is 130 ℃, temperature retention time 40min; The low temperature reaction sintering temperature is 600 ℃, and temperature retention time is 120min; High temperature sintering is 1400 ℃, and temperature retention time is 180min.After reaction finishes, cool off with stove.Thus obtained TiAl base intermetallic compound porous coating has even pore distribution, and is not of uniform size and be mazy pore structure, and the sintered body skeleton is by γ/α
2Lamella is formed, and distribution of pores therebetween.The porous coating porosity is 25 ~ 30%, and percent opening is 95～98%, and pore diameter range is 1～10 μ m, and coating layer thickness is 0.4～0.6mm.
Embodiment 2: adopt granularity to be Ti powder and the Al powder of 40 ~ 75 μ m, carry out proportioning by Ti-48Al (at.%) composition, put into the V-type batch mixer and mixed 8 hours.After mixing, fully dry to obtain cold-spraying sediment powder under vacuum.Pure Ti substrate is carried out sand papering to 1500# sand paper, carry out ultrasonic waves for cleaning, dried again.Subsequently powder is placed reaction-injection moulding equipment, adopt nitrogen atmosphere, the nitrogen heating-up temperature is 400 ℃, and spray gun and pure Ti substrate distance are 20mm, and the relative substrate translational speed of spray gun is 500mm/min.Spraying finishes and can obtain the TiAl powder coating that one deck is close to densification, and this sample is placed vacuum reaction stove sintering.Sintering adopts three elementary reaction synthesis techniques, vacuum atmosphere, and vacuum degree control is 1 * 10
-2~ 1 * 10
-3Pa.Degassing temperature is 120 ℃, temperature retention time 30min; The low temperature reaction sintering temperature is 600 ℃, and temperature retention time is 120min; High temperature sintering is 1300 ℃, and temperature retention time is 180min.After reaction finishes, cool off with stove.Thus obtained titanium aluminum based metal compound porous coating has even pore distribution, and is not of uniform size and be mazy pore structure (see figure 2), and the sintered body skeleton is by γ/α
2Lamella is formed (see figure 3), and distribution of pores therebetween.The porous coating porosity is 22 ~ 25%, and percent opening is 95～98%, and pore diameter range is 1～5 μ m, and coating layer thickness is 0.4～0.6mm.
Embodiment 3: adopt granularity to be Ti powder and the Al powder of 75 ~ 150 μ m, granularity is the Nb powder of 5 ~ 25 μ m, carries out proportioning by Ti-50Al-8Nb (at.%) composition, puts into the V-type batch mixer and mixes 5 hours.After mixing, fully dry to obtain cold-spraying sediment powder under vacuum.Pure Ti substrate is carried out sand papering to 1500# sand paper, carry out ultrasonic waves for cleaning, dried again.Subsequently powder is placed reaction-injection moulding equipment, adopt nitrogen atmosphere, the nitrogen heating-up temperature is 00 ℃, and spray gun and pure titanium-base distance are 15mm, and the relative substrate translational speed of spray gun is 100mm/min.Spraying finishes and can obtain the TiAl-Nb powder coating that one deck is close to densification, and this sample is placed vacuum reaction stove sintering.Sintering adopts three elementary reaction synthesis techniques, vacuum atmosphere, and vacuum degree control is 1 * 10
-2~ 1 * 10
-3Pa.Degassing temperature is 150 ℃, temperature retention time 60min; The low temperature reaction sintering temperature is 550 ℃, and temperature retention time is 180min; High temperature sintering is 1400 ℃, and temperature retention time is 3000min.After reaction finishes, cool off with stove.Thus obtained titanium aluminum based metal compound porous coating has even pore distribution, and is not of uniform size and be mazy pore structure, and the sintered body skeleton is by γ/α
2Lamella is formed, and distribution of pores therebetween.The porous coating porosity is 25 ~ 30%, and percent opening is 95～98%, and pore diameter range is 1～10 μ m, and coating layer thickness is 2.5～3mm.
Claims (4)
1. the preparation method on titanium aluminum based metal compound porous heat transfer surface is characterized in that preparation process comprises:
1) with Ti powder, Al powder and Nb powder according to atomic percent Ti-(43 ~ 50) Al-(0～10) Nb at.% batching, then each powder is put into the V-type batch mixer and was mixed 5～8 hours, take out after the powder for drying as cold-spraying sediment powder;
2) mixing cold-spraying sediment powder that step 1) is prepared places the dusting device of reaction-injection moulding machine; Pure Ti or TiAl alloy substrate are polished; Carrying out ultrasonic waves for cleaning again handles; Then cold-spraying sediment powder is adopted disposable the depositing on pure Ti or the TiAl alloy substrate of mode of cold spraying; Cold spray operating temperature is 300～500 ℃, adopts the spraying of nitrogen or argon gas atmosphere;
3) with step 2) in sample place vacuum sintering furnace; Adopt three stage sintering process: the first step is at 120～150 ℃ of insulation 30～60min; Second step was warming up to 550～600 ℃ of insulation 120～180min; The 3rd step was warming up to 1300～1400 ℃ of insulation 180～300min; After the vacuum heat-preserving sintering process; With the stove cooling, on pure Ti, TiAl alloy substrate, make one deck TiAl base intermetallic compound porous coating.
2. preparation method as claimed in claim 1 is characterized in that, the granularity of said Ti powder is 25 μ m～150 μ m, and the granularity of Al powder is 25 μ m～150 μ m, and the granularity of Nb powder is less than 25 μ m.
3. preparation method as claimed in claim 1 is characterized in that, said pure Ti, TiAl alloy substrate are polished to 1500# sand paper.
4. like claim 1 or 3 described preparation methods, it is characterized in that said pure Ti or TiAl alloy substrate are sheet material or tubing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110249709A CN102303117A (en) | 2011-08-27 | 2011-08-27 | Method for preparing porous heat exchange surface of TiAl-based intermetallic compound |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201110249709A CN102303117A (en) | 2011-08-27 | 2011-08-27 | Method for preparing porous heat exchange surface of TiAl-based intermetallic compound |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102303117A true CN102303117A (en) | 2012-01-04 |
Family
ID=45377085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201110249709A Pending CN102303117A (en) | 2011-08-27 | 2011-08-27 | Method for preparing porous heat exchange surface of TiAl-based intermetallic compound |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN102303117A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385429A (en) * | 2017-07-11 | 2017-11-24 | 西安建筑科技大学 | A kind of medical titanium alloy porous surface titanium coating and preparation method thereof |
| CN108044091A (en) * | 2017-12-07 | 2018-05-18 | 北京科技大学 | A kind of preparation of high-Nb Ti-Al base porous compound material filtration membrane and application process |
| WO2019110707A1 (en) * | 2017-12-07 | 2019-06-13 | Lufthansa Technik Ag | Method for applying a titanium aluminide alloy, titanium aluminide alloy and substrate comprising a titanium aluminide alloy |
| CN110904446A (en) * | 2019-12-04 | 2020-03-24 | 广东省新材料研究所 | Preparation method of titanium-aluminum part |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101285136A (en) * | 2008-05-15 | 2008-10-15 | 西北工业大学 | Preparation method for porous titanium and porous titanium alloy |
| US20090003943A1 (en) * | 2007-06-01 | 2009-01-01 | Sandvik Intellectual Property Ab | Coated cemented carbide cutting tool insert |
| CN101994043A (en) * | 2010-12-08 | 2011-03-30 | 北京科技大学 | High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof |
-
2011
- 2011-08-27 CN CN201110249709A patent/CN102303117A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090003943A1 (en) * | 2007-06-01 | 2009-01-01 | Sandvik Intellectual Property Ab | Coated cemented carbide cutting tool insert |
| CN101285136A (en) * | 2008-05-15 | 2008-10-15 | 西北工业大学 | Preparation method for porous titanium and porous titanium alloy |
| CN101994043A (en) * | 2010-12-08 | 2011-03-30 | 北京科技大学 | High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof |
Non-Patent Citations (2)
| Title |
|---|
| 江垚: "Ti-Al金属间化合物多孔材料的研究", 《中国博士学位论文全文数据库工程科技Ⅰ辑》 * |
| 江垚等: "Ti-Al金属间化合物多孔材料的研究进展", 《中国材料进展》 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107385429A (en) * | 2017-07-11 | 2017-11-24 | 西安建筑科技大学 | A kind of medical titanium alloy porous surface titanium coating and preparation method thereof |
| CN107385429B (en) * | 2017-07-11 | 2019-12-31 | 西安建筑科技大学 | Medical titanium alloy surface porous titanium coating and preparation method thereof |
| CN108044091A (en) * | 2017-12-07 | 2018-05-18 | 北京科技大学 | A kind of preparation of high-Nb Ti-Al base porous compound material filtration membrane and application process |
| WO2019110707A1 (en) * | 2017-12-07 | 2019-06-13 | Lufthansa Technik Ag | Method for applying a titanium aluminide alloy, titanium aluminide alloy and substrate comprising a titanium aluminide alloy |
| CN108044091B (en) * | 2017-12-07 | 2019-12-31 | 北京科技大学 | Preparation and application methods of high-niobium titanium-aluminum-based porous composite material filter membrane |
| US11692273B2 (en) | 2017-12-07 | 2023-07-04 | Lufthansa Technik Ag | Method for applying a titanium aluminide alloy, titanium aluminide alloy and substrate comprising a titanium aluminide alloy |
| CN110904446A (en) * | 2019-12-04 | 2020-03-24 | 广东省新材料研究所 | Preparation method of titanium-aluminum part |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103935103B (en) | Preparation method of graphene/metal composite panel | |
| CN102303117A (en) | Method for preparing porous heat exchange surface of TiAl-based intermetallic compound | |
| CN102445097B (en) | High-efficiency gravity heat pipe and manufacturing method thereof | |
| CN101994043A (en) | High Nb containing TiAl porous intermetallic compound gradient material and preparation method thereof | |
| CN101698939A (en) | Method for preparing icing-resistant copper surface with super hydrophobicity and low adhesiveness | |
| CN102744928A (en) | Preparation method for Ti3Al-TiAl laminated composite material | |
| CN106521451A (en) | Method for plating tungsten on diamond powder surface | |
| CN106811724A (en) | A kind of corrosion-resistant high-entropy alloy coating of Mg alloy surface and preparation method thereof | |
| CN102689014A (en) | Preparation method of metal fiber porous surface heat exchange tube | |
| CN107699848B (en) | Mo/Si/SiO2The preparation method of solar selectively absorbing coating | |
| CN106609353B (en) | Gas pulses reactive sputtering prepares Al2O3Hinder the method for tritium coating | |
| CN102443796A (en) | Porous Fe-Al intermetallic compound coating and its preparation method | |
| CN104987134B (en) | Method for preparing nickel coating on ceramic surface by using in-situ reduction method | |
| CN110699642B (en) | High-entropy alloy-based high-temperature solar energy absorbing coating and preparation method thereof | |
| CN111155052A (en) | Er2O3Preparation method and application of coating | |
| CN101864582A (en) | Preparation method of aluminum base large-area electroplating black chromium solar heat collecting panel | |
| CN201344668Y (en) | Selective solar photo-thermal absorbing composite coat | |
| CN115044868B (en) | Oxide ceramic and two-dimensional material composite hydrogen-resistant coating and preparation method thereof | |
| CN103288494B (en) | Method for preparing titanium metal coating on ceramic surface | |
| CN106083217B (en) | The preparation method of surface of carbon/carbon composite reactive deposition metal W skeleton coating | |
| CN108468033A (en) | A kind of high temperature resistant solar selectively absorbing coating and preparation method thereof | |
| CN101520247B (en) | Inner tube of heat collector tube for use in trough type solar power generation and method for preparing same | |
| CN105040070B (en) | A kind of preparation method of titanium TA2 surface high solar absorption low-launch-rate film layer | |
| CN103060754A (en) | Preparation method of high-temperature oxidation resistant titanium alloy gradient material | |
| CN102758181A (en) | Method for preparing oxide dispersion strengthen (ODS) high-temperature alloy pipe |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C02 | Deemed withdrawal of patent application after publication (patent law 2001) | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20120104 |