CN101906631B - Method for quickly preparing Ti3Al/TiN composite coating - Google Patents

Method for quickly preparing Ti3Al/TiN composite coating Download PDF

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CN101906631B
CN101906631B CN2010102546676A CN201010254667A CN101906631B CN 101906631 B CN101906631 B CN 101906631B CN 2010102546676 A CN2010102546676 A CN 2010102546676A CN 201010254667 A CN201010254667 A CN 201010254667A CN 101906631 B CN101906631 B CN 101906631B
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coating
tin compound
compound coating
laser
matrix
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CN101906631A (en
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张显程
邵冬冬
轩福贞
王正东
涂善东
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East China University of Science and Technology
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East China University of Science and Technology
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Abstract

The invention discloses a method for quickly preparing a Ti3Al/TiN composite coating, comprising the following steps of: firstly, carrying out plasma spraying on the surface of a Ti6Al4V substrate by using aluminum powder and presetting a layer of pure aluminum coating; secondly, scanning the pure aluminum coating by using a laser beam under the pure nitrogen vacuum environment so as to generate reaction among Al, Ti and N; and finally quickly generating the Ti3Al/TiN composite coating in situ on the surface of the substrate. The method has the advantages of short time, low cost, simple process and easy operation; the composite coating has larger thickness; and the metallurgical combination is formed between the coating and the substrate without remarkable interface.

Description

A kind of quick Ti＜sub for preparing〉3＜/sub〉method of Al/TiN compound coating
Technical field
The present invention relates to titanium alloy surface modification field, be specially a kind of laser in-situ and prepare Ti fast 3The method of Al/TiN ceramic base compound coating.
Background technology
Titanium alloy has the excellent comprehensive performance, as good solidity to corrosion, high strength and excellent biological compatibility, it is with a wide range of applications at space flight, aviation, chemical industry and biomedical sector.Yet the hardness of titanium alloy is lower, wear resisting property is poor, and is difficult to lubricate, and makes its application at numerous key parts be subjected to very big restriction.Therefore adopt effective surface modification means to improve the wear resisting property of titanium alloy member and just become important research direction in the industrial development such as aviation work-ing life.
Ti 3The Al coating reaches high-temperature stability preferably owing to have higher hardness, has been widely used in improving wear resistance of titanium alloy and high temperature oxidation resistance.But Ti 3Al belongs to a kind of intermetallic compound, and its hardness pottery relatively is lower, can not be on transmission component such as axle, gear long service.How to prepare and comprise Ti 3The high rigidity metal/ceramic compound coating of Al is insider's hot issue of extensive concern in recent years.There are some researches show: at Ti 3Al implants the TiN ceramic enhancement phase, forms the compound coating with high rigidity, high-wearing feature and high antioxygenic property, can significantly improve Ti 3Al coating and wear resistance of titanium alloy and high-temperature stability.
The preparation method of at present traditional relevant TiN base composite coating mainly contains magnetron sputtering method (MS), hallow cathode deposition, HCD (HCD), multi-arc ion coating, radio-frequency sputtering and ion beam assisted depositing method (IBAD) etc., and they all can obtain the lower ganoine thin film of thickness.But aforesaid method all has some common shortcomings.On the one hand, adopt aforesaid device to prepare Ti 3Al/TiN time length, complex process, cost is higher, sedimentation effect is low, once finishes the synthetic of compound coating, also is difficult to realize; On the other hand, the film thickness of traditional method preparation can only maintain the submicron rank, has tangible interface between film and the matrix, and bonding properties is relatively poor.
Summary of the invention
In order to solve titanium alloy key components and parts surface abrasion problem, the object of the present invention is to provide a kind of quick preparation Ti 3The processing method of Al/TiN compound coating.Adopt this processing method to carry out surface Hardening Treatment, also can carry out local geometric size and performance recovery, and reach the purpose that manufacturing is again lengthened the life the titanium alloy component that wear and tear reduced in size at the key components and parts (as axle, blade) of titanium alloy preparation.
Quick preparation Ti provided by the invention 3The method of Al/TiN compound coating comprises:
A), at Ti 6Al 4V matrix surface plasma spraying aluminium powder presets one deck fine aluminium coating;
B), the described matrix that will preset described fine aluminium coating places pure nitrogen gas atmosphere, utilizes laser beam that described fine aluminium coating is scanned, and generates Ti at described matrix surface quick in situ 3The Al/TiN compound coating.
Preferably, the purity of described nitrogen＞99.99%.
Further, method of the present invention also is included in preceding described matrix is positioned over of described steps A and carries out the surface chemistry ultrasonic cleaning in the acetone soln, carries out the step that surface sand-blasting is handled then.
According to a preferred embodiment of the invention, the purity of described aluminium powder is higher than 99%, and the granularity size is 50～100 μ m.The thickness of described fine aluminium coating is 150～200 μ m.The test parameter of described plasma spraying is: working current is 600A, and operating voltage is 60V, argon pressure 0.4MPa, and hydrogen pressure 0.25MPa, powder feed rate is: 3.086g/min, spray distance are 150mm.The described laser beam that utilizes to the process parameter that described fine aluminium coating scans is: laser power is 2.0～3.5KW, and sweep velocity is 100～300mm/min, and defocusing amount is 0mm, and nitrogen flow is 40～100L/min.
Method of the present invention can improve titanium or titanium alloy surface hardness, wear resistance and oxidation-resistance.Method is simple, cost is low, and the time is short, easy handling, and the compound coating thickness that obtains is bigger, is metallurgical binding between coating and the matrix, and does not have sharp interface.
Description of drawings
Fig. 1 is a Laser Surface Treatment device synoptic diagram.
Fig. 2 is the X-ray diffraction figure of embodiment 1 reaction product.
Fig. 3 is the optical microscope photograph of embodiment 1 reaction product.
Fig. 4 is the X-ray diffraction figure of embodiment 2 reaction product.
Fig. 5 is the optical microscope photograph of embodiment 2 reaction product.
Fig. 6 is the X-ray diffraction figure of embodiment 3 reaction product.
Fig. 7 is the optical microscope photograph of embodiment 3 reaction product.
Embodiment
Below in conjunction with specific embodiment, the present invention will be further described.Should be understood that following examples only are used to the present invention to be described but not to be used to limits the scope of the invention.
Among the embodiment of the invention 1-3, the purity that is used for the Al powder of plasma spraying is higher than 99%, and the granularity size is 50～100 μ m, is produced by Beijing Mine and Metallurgy General Inst's metallic substance institute; The plasma spray of Al coating is coated on the APS-2000 type plasma spray apparatus that the Beijing Aeronautics Research Inst produces carries out; The CP4000 type CO that adopts Shanghai Unity Purui Laser Equipment Co., Ltd. as shown in Figure 1 to produce 2Laser-processing system is as the synthetic compound coating of Laser Surface Treatment device laser in-situ under nitrogen environment.
Embodiment 1
With thickness is the titanium alloy substrate (Ti of 5mm 6Al 4V) chemical ultrasonic cleaning is carried out on the surface, and carries out surface sand-blasting and handle; Adopting plasma spray apparatus then is the pure Al coating of 150～200 μ m at the matrix surface deposit thickness, spraying parameter is: working current is 600A, operating voltage is 60V, argon pressure 0.4MPa, hydrogen pressure 0.25MPa, powder feed rate is: 3.086g/min, spray distance are 150mm, and used aluminum particle degree size is 50～100 μ m.Adopt Laser Surface Treatment device as shown in Figure 1, the Al coatingsurface polished coating sample 3 is put into to the 0.15mm the airtight reaction chamber 2 of laser-processing system, vacuumize, gas in the reaction chamber 2 is 5 discharges from the air outlet, form vacuum environment, constantly feed nitrogen from inlet mouth 6 then, inflationtime＞5 minute make in the reaction chamber 2 to be full of nitrogen; To produce CO 2The loop laser nozzle of laser beam is put into the reaction chamber of vacuum, and aims at coating edge; Open CO 2Laser apparatus 1; laser beam 7 after ring nozzle output feeds nitrogen simultaneously in the protection gas passage around the laser beam 7, allows the at the uniform velocity inswept coating 4 of laser beam through integral mirror 8 refraction; N is reacted with Al, Ti under hot environment, generate Ti at the matrix surface quick in situ 3The Al/TiN compound coating.Laser power is 3.5KW, and sweep velocity is 200mm/min, and nitrogen flow is 80L/min.
When the laser nozzle sweep velocity is 200mm/min, the compound coating of preparation surface X-ray diffraction figure as shown in Figure 2, the analytical results of X-ray diffraction material phase analysis shows: the main component in the coating is TiN and Ti 3Two kinds of thing phases of Al.The optical microscope photograph of its internal microstructure as shown in Figure 3.Can find: coatingsurface is smooth flat bright, is golden yellow, and coatingsurface and inner pore-free, crackle are metallurgical binding between coating and the titanium alloy substrate, homogeneous microstructure, and no metallurgical imperfection exists; The thickness of compound coating is about 700mm.
Embodiment 2
With thickness is the titanium alloy substrate (Ti of 5mm 6Al 4V) chemical ultrasonic cleaning is carried out on the surface, and carries out surface sand-blasting and handle; Adopting plasma spray apparatus then is the pure Al coating of 150～200 μ m at the matrix surface deposit thickness, spraying parameter is: working current is 600A, operating voltage is 60V, argon pressure 0.4MPa, hydrogen pressure 0.25MPa, powder feed rate is: 3.086g/min, spray distance are 150mm, and used aluminum particle degree size is 50～100 μ m.Adopt Laser Surface Treatment device as shown in Figure 1, the Al coatingsurface polished coating sample 3 is put into to the 0.15mm the airtight reaction chamber 2 of laser-processing system, vacuumize, gas in the reaction chamber 2 is 5 discharges from the air outlet, form vacuum environment, constantly feed nitrogen from inlet mouth 6 then, inflationtime＞5 minute make in the reaction chamber 2 to be full of nitrogen; To produce CO 2The loop laser nozzle of laser beam is put into the reaction chamber of vacuum, and aims at coating edge; Open CO 2Laser apparatus 1; laser beam 7 after ring nozzle output feeds nitrogen simultaneously in the protection gas passage around the laser beam 7, allows the at the uniform velocity inswept coating 4 of laser beam through integral mirror 8 refraction; N is reacted with Al, Ti under hot environment, generate Ti at the matrix surface quick in situ 3The Al/TiN compound coating.Laser power is 3.5KW, and sweep velocity is 300mm/min, and nitrogen flow is 80L/min.
When the laser nozzle sweep velocity is 300mm/min, the compound coating of preparation surface X-ray diffraction figure as shown in Figure 4, the analytical results of X-ray diffraction material phase analysis shows: the main component in the coating is TiN and Ti 3Two kinds of thing phases of Al.The optical microscope photograph of its internal microstructure as shown in Figure 5.Can find: coatingsurface is smooth flat bright, is golden yellow, and coatingsurface and inner pore-free, crackle are metallurgical binding between coating and the titanium alloy substrate, homogeneous microstructure, and no metallurgical imperfection exists; The thickness of compound coating is about 600mm.
Embodiment 3
With thickness is the titanium alloy substrate (Ti of 5mm 6Al 4V) chemical ultrasonic cleaning is carried out on the surface, and carries out surface sand-blasting and handle; Adopting plasma spray apparatus then is the pure Al coating of 150～200 μ m at the matrix surface deposit thickness, spraying parameter is: working current is 600A, operating voltage is 60V, argon pressure 0.4MPa, hydrogen pressure 0.25MPa, powder feed rate is: 3.086g/min, spray distance are 150mm, and used aluminum particle degree size is 50～100 μ m.Adopt Laser Surface Treatment device as shown in Figure 1, the Al coatingsurface polished coating sample 3 is put into to the 0.15mm the airtight reaction chamber 2 of laser-processing system, vacuumize, gas in the reaction chamber 2 is 5 discharges from the air outlet, form vacuum environment, constantly feed nitrogen from inlet mouth 6 then, inflationtime＞5 minute make in the reaction chamber 2 to be full of nitrogen; To produce CO 2The loop laser nozzle of laser beam is put into the reaction chamber of vacuum, and aims at coating edge; Open CO 2Laser apparatus 1; laser beam 7 after ring nozzle output feeds nitrogen simultaneously in the protection gas passage around the laser beam 7, allows the at the uniform velocity inswept coating 4 of laser beam through integral mirror 8 refraction; N is reacted with Al, Ti under hot environment, generate Ti at the matrix surface quick in situ 3The Al/TiN compound coating.Laser power is 3.5KW, and sweep velocity is 400mm/min, and nitrogen flow is 80L/min.
When the laser nozzle sweep velocity is 400mm/min, the compound coating of preparation surface X-ray diffraction figure as shown in Figure 6, the analytical results of X-ray diffraction material phase analysis shows: the main component in the coating is TiN and Ti 3Two kinds of thing phases of Al.The optical microscope photograph of its internal microstructure as shown in Figure 7.Can find: coatingsurface is smooth flat bright, is golden yellow, and coatingsurface and inner pore-free, crackle are metallurgical binding between coating and the titanium alloy substrate, homogeneous microstructure, and no metallurgical imperfection exists; The thickness of compound coating is about 500mm.
From the result of embodiment 1-3 as can be seen: adopt no laser nozzle sweep velocity, the microtexture of coating inside and the thickness of coating all change to some extent, but between coating and the matrix all are metallurgical binding.Therefore, can suitably choose laser technical parameters according to the difference of matrix thickness and the needs of coat-thickness.
The present invention compared with prior art has following advantage:
(1) Ti-Al and Ti-N two individual system react simultaneously, and interact, can disposable synthetic Ti 3The Al-TiN compound coating is simplified building-up process;
(2) the LASER HEATING mode is pollution-free, contactless, heating and rate of cooling height; The matrix thermal distortion is little, can realize the preparation of different thickness coating by changing laser technical parameters and nitrogen flow;
(3) can selectively the component regional area be repaired or lengthen the life, the operating time is short, and preparation technology is simple, easy handling;
(4) Ti of system of the present invention 3Al/TiN compound coating thickness is bigger, is metallurgical binding between coating and the matrix, no sharp interface.

Claims (5)

1. one kind prepares Ti fast 3The method of Al/TiN compound coating is characterized in that, comprising:
A), at Ti 6Al 4V matrix surface plasma spraying aluminium powder presets one deck fine aluminium coating; Wherein, the granularity size of described aluminium powder is 50～100 μ m, and the thickness of described fine aluminium coating is 150～200 μ m;
B), the described matrix that will preset described fine aluminium coating places pure nitrogen gas atmosphere, utilizes laser beam that described fine aluminium coating is scanned, and generates Ti at described matrix surface quick in situ 3The Al/TiN compound coating; Wherein, described laser power is 2.0～3.5kW, and sweep velocity is 100～300mm/min, and defocusing amount is 0mm, and nitrogen flow is 40～100L/min.
2. quick preparation Ti as claimed in claim 1 3The method of Al/TiN compound coating is characterized in that, also is included in preceding described matrix is positioned over of described steps A and carries out the surface chemistry ultrasonic cleaning in the acetone soln, carries out the step that surface sand-blasting is handled then.
3. quick preparation Ti as claimed in claim 1 3The method of Al/TiN compound coating is characterized in that, the purity of described aluminium powder is higher than 99%.
4. quick preparation Ti according to claim 1 3The method of Al/TiN compound coating is characterized in that, the test parameter of described plasma spraying is: working current is 600A, operating voltage is 60V, argon pressure 0.4MPa, hydrogen pressure 0.25MPa, powder feed rate is: 3.086g/min, spray distance are 150mm.
5. quick preparation Ti according to claim 1 3The method of Al/TiN compound coating is characterized in that, the purity of described nitrogen＞99.99%.
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CN102676982B (en) * 2012-06-05 2014-04-02 华东理工大学 Fast in-situ preparation method of TiN/Al composite coating
CN106947970A (en) * 2017-03-23 2017-07-14 华东理工大学 A kind of titanium or titanium alloy surface prepares fine grain Ti3The method and apparatus of Al/TiN gradient coatings
CN111962063B (en) * 2020-07-24 2022-05-27 中国航发北京航空材料研究院 Preparation method of high-temperature protective coating

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413641A (en) * 1992-10-09 1995-05-09 Gec Alsthom Electromecanique Sa Laser nitriding an element made of titanium alloy by blowing nitrogen and inert gas
CN1605413A (en) * 2004-10-20 2005-04-13 华南理工大学 Method for synthesizing TiNi-TiN gradient material by laser-induction self-spreading under high temperature

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5413641A (en) * 1992-10-09 1995-05-09 Gec Alsthom Electromecanique Sa Laser nitriding an element made of titanium alloy by blowing nitrogen and inert gas
CN1605413A (en) * 2004-10-20 2005-04-13 华南理工大学 Method for synthesizing TiNi-TiN gradient material by laser-induction self-spreading under high temperature

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
J.H. Abboud etal.Laser surface alloying of titanium with aluminium.《Journal of Materials Science Letters》.1990,(第9期), *

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