A kind of high-temperature wearable damage oxidation susceptibility coating production
阅读说明：本技术 一种高温耐磨损氧化性能涂层制备方法 (A kind of high-temperature wearable damage oxidation susceptibility coating production ) 是由 李博 高义民 李聪 康云川 郑巧玲 赵四勇 于 2019-09-18 设计创作，主要内容包括：本发明公开了一种高温耐磨损氧化性能涂层制备方法,先对基底试样进行喷砂处理,然后采用等离子喷涂法对试样进行喷涂处理,喷涂过程中,在喷枪移动的同时,将试样固定在转台上,让其快速转动,可有效防止涂层局部过热,最后经高温真空热处理制备成MCrAlY涂层。通过对涂层进行真空热处理,有效降低涂层中的裂纹和气孔等缺陷,涂层的结合强度明显升高,1100℃热处理后,涂层的气孔率降低为0.86％,结合强度升高为62.1Mpa,900℃高温下具有优异的耐磨性和抗氧化性能,综合性能较好。(The invention discloses a kind of high-temperature wearables to damage oxidation susceptibility coating production, blasting treatment first is carried out to substrate sample, then spray treatment is carried out to sample using plasma spraying method, in spraying process, while spray gun is mobile, sample is fixed on turntable, allows its quick rotation, it can be effectively prevent coating hot-spot, be most prepared into MCrAlY coating through high-temperature vacuum heat treatment afterwards.By carrying out vacuum heat treatment to coating, the defects of crackle and stomata in coating is effectively reduced, the bond strength of coating is significantly raised, after 1100 DEG C of heat treatments, the porosity of coating is reduced to 0.86%, it is 62.1Mpa that bond strength, which increases, has excellent wearability and antioxygenic property under 900 DEG C of high temperature, comprehensive performance is preferable.)
1. a kind of high-temperature wearable damages oxidation susceptibility coating production, which comprises the following steps:
S1,718 high temperature alloy of Inconel is cut into sample, and polishing and cleaning treatment；
S2, blasting treatment is carried out to the sample after ultrasonic cleaning, is then cleaned by ultrasonic again；
S3, the pre-heat treatment is carried out to the sample after step S2 ultrasonic cleaning, then rotates sample and is sprayed；
S4, the step S3 sample sprayed is heat-treated, then furnace cooling, 320~380 μm of thickness is made, it is micro- hard Spend 329.8~371.1HV, the porosity 0.86~8.98%, the MCrAlY coating of 39.3~62.1MPa of bond strength.
2. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that in step S1, The size of sample is
3. high-temperature wearable according to claim 1 or 2 damages oxidation susceptibility coating production, which is characterized in that step S1 In, sample is cleaned by ultrasonic 20~60min in alcohol.
4. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that in step S2, The sand of blasting treatment uses corundum, and partial size is 50~100 μm.
5. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that in step S3, In Ar and H2It is sprayed in atmosphere, the flow of Ar is 38~45L/min, H2Flow be 4.5~6L/min, spray angle is 80~100 °, powder feeding rate be 40~45g/min, electric current be 500~550A, voltage be 50~60V, spray distance be 100~ 110mm。
6. high-temperature wearable according to claim 5 damages oxidation susceptibility coating production, which is characterized in that the pre-heat treatment Temperature is 300~500 DEG C.
7. high-temperature wearable according to claim 5 damages oxidation susceptibility coating production, which is characterized in that spray treatment Before, spraying is subjected to drying and processing with Sulzer Metco powder in a vacuum drying oven, drying temperature is 40~60 DEG C, vacuum Degree is 1 × 10-1~6 × 10-1The partial size of Pa, Sulzer Metco powder is 53~106 μm.
8. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that in step S3, In spraying process, velocity of rotation of the sample on turntable is 200~300r/min.
9. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that in step S4, The vacuum degree of heat treatment is 1 × 10-2Pa~5 × 10-2Pa, temperature are 800~1200 DEG C, and heating rate is 8~12 DEG C/min, Soaking time is 0.5~3.5h.
10. high-temperature wearable according to claim 1 damages oxidation susceptibility coating production, which is characterized in that MCrAlY is applied Layer is 1.6 × 10 in 900 DEG C of wear rate-5~8.6 × 10-5mm3/N.m。
Technical field
The invention belongs to coating material technical fields, and in particular to a kind of high-temperature wearable damage oxidation susceptibility coating preparation side Method.
Background technique
With the continuous development of science and technology, the new high-tech industries such as aerospace, thermonuclear, Energy Project are needed in height Temperature, high speed and the high mechanical equipment operated under extreme harsh working condition such as carry are more and more, brought wear-out failure and Caused by resource and energy waste problem it is further prominent.Especially using advanced engine as the high-temperature machinery of representative, with engine The raising of thrust ratio, so that the out temperature of engine, chamber temperature and revolving speed increase substantially, it is desirable that high temperature lubricating Component realizes that superhigh temperature resistant degree, the wear-resisting optimization for undermining the performances such as anti-oxidant are unified, to propose more to high-temperature lubricating material High requirement.
MCrAlY (M=Co or/and Ni) coating using plasma spray technology preparation has excellent high-temperature oxidation resistance And abrasion resistance properties, it is widely used to the new high-tech industries such as aerospace, nuclear industry.But it is typically contained in hot-spraying coating The defects of a large amount of crackle and stomata, the bond strength between coating and substrate is lower, this will limit coating material in harsh item Popularization and application under part.
Summary of the invention
In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the present invention is that providing a kind of high-temperature wearable Oxidation susceptibility coating production is damaged, is effectively reduced crackle and gas hole defect in coating, with excellent resistance under 900 DEG C of high temperature Mill property and antioxygenic property, comprehensive performance are preferable.
The invention adopts the following technical scheme:
A kind of high-temperature wearable damage oxidation susceptibility coating production, comprising the following steps:
S1,718 high temperature alloy of Inconel is cut into sample, and polishing and cleaning treatment；
S2, blasting treatment is carried out to the sample after ultrasonic cleaning, is then cleaned by ultrasonic again；
S3, the pre-heat treatment is carried out to the sample after step S2 ultrasonic cleaning, then rotates sample and is sprayed；
S4, the step S3 sample sprayed is heat-treated, then furnace cooling, 320~380 μm of thickness is made, shown 329.8~371.1HV of microhardness, the porosity 0.86~8.98%, the MCrAlY coating of 39.3~62.1MPa of bond strength.
Specifically, in step S1, the size of sample is
Further, in step S1, sample is cleaned by ultrasonic 20~60min in alcohol.
Specifically, the sand of blasting treatment uses corundum in step S2, particle size range is 50~100 μm.
Specifically, in step S3, in Ar and H2It is sprayed in atmosphere, the flow of Ar is 38~45L/min, H2Flow For 4.5~6L/min, spray angle is 80~100 °, and powder feeding rate is 40~45g/min, and electric current is 500~550A, voltage 50 ~60V, spray distance are 100~110mm.
Further, the temperature of the pre-heat treatment is 300~500 DEG C.
Further, before spray treatment, spraying is carried out at drying in a vacuum drying oven with Sulzer Metco powder Reason, drying temperature are 40~60 DEG C, and vacuum degree is 1 × 10-1~6 × 10-1The partial size of Pa, Sulzer Metco powder be 53~ 106μm。
Specifically, in spraying process, velocity of rotation of the sample on turntable is 200~300r/min in step S3.
Specifically, the vacuum degree of heat treatment is 1 × 10 in step S4-2Pa~5 × 10-2Pa, temperature are 800~1200 DEG C, heating rate is 8~12 DEG C/min, and soaking time is 0.5~3.5h.
Specifically, MCrAlY coating is 1.6 × 10 in 900 DEG C of wear rate-5~8.6 × 10-5mm3/N.m。
Compared with prior art, the present invention at least has the advantages that
A kind of high-temperature wearable of the present invention damages oxidation susceptibility coating production, select 718 high temperature alloy of Inconel as Basis material is to can satisfy actual condition demand, spraying process because the invention material is used under high temperature harsh conditions In, while spray gun is mobile, sample is fixed on high-speed rotation on turntable, by carrying out vacuum heat treatment to coating, makes to apply The defects of institutional framework of layer becomes dense uniform, effectively reduces the crackle and stomata in coating, the combination for improving coating is strong Degree.
Further, specimen size selectsBe in order to preferably with high-temperature friction testing machine phase Match, 20~60min is cleaned by ultrasonic in alcohol, the grease stain and indissoluble object of specimen surface can be preferably washed, thus effectively Improve the bond strength of coating.
Further, nozzle with substrate sample surface keeps vertical as far as possible in the present invention, on the one hand can guarantee to spray Distance is consistent, on the other hand melt granules can be made uniformly and effectively to be attached to substrate surface.Spray distance is too short, will lead to painting Layer burning, spray distance is too long, it is difficult to guarantee coating attachment uniformly, and sprayed particle may melt it is insufficient.Therefore, selecting should Spray parameters in invention.
Further, before spray test, it is to make melt granules preferably in substrate that test, which is preheated to 300~500 DEG C, Surface attachment, so as to improve the bond strength of coating.
Further, in the present invention, coating hot-spot in order to prevent, will while spray gun is mobile in spraying process Sample is fixed on turntable, and makes its high-speed rotation.
Further, the defects of typically containing a large amount of crackle and stomata in plasma-coated, coating and substrate interface In conjunction with poor.The defects of heat treatment can be effectively improved the institutional framework of coating, reduce the crackle and stomata in coating, effectively improves The bond strength of coating.
Further, 1100 DEG C of heat treatment, the porosity of coating minimum 0.86%, bond strength is up to 62.1MPa, Possess good wearability and antioxygenic property under 900 DEG C of high temperature, and there is excellent comprehensive performance.
In conclusion the present invention chooses 718 high temperature alloy of Inconel as basis material, and use plasma spraying skill Art sprays one layer of MCrAlY (M=Co or/and Ni) coating on its surface, effectively reduces splitting in coating by vacuum heat treatment The defects of line and stomata, compared with the coating of conventional method preparation, bond strength significantly improves, possesses under 900 DEG C of high temperature good Wearability and antioxygenic property have excellent comprehensive performance.
Below by drawings and examples, technical scheme of the present invention will be described in further detail.
Detailed description of the invention
Fig. 1 is the organization chart of the untreated state of coating；
Fig. 2 is the organization chart after 900 DEG C of coating heat treatment；
Fig. 3 is the organization chart after 1100 DEG C of coating heat treatment.
Specific embodiment
The present invention provides a kind of high-temperature wearables to damage oxidation susceptibility coating production, is prepared using plasma spraying technology MCrAlY (M=Co or/and Ni) coating, the defects of a large amount of crackle and stomata are contained in coating, interface between coating and substrate There are also gas cell distributions at place, and the porosity of coating is higher, and microhardness, bond strength are relatively low, the mill under 900 DEG C of high temperature Loss rate is relatively high, and wear-resisting property is poor.By 1100 DEG C of vacuum heat treatments, the defects of crackle and stomata in coating, obviously subtracts Few, the stomata of interface disappears substantially, and the porosity of coating is reduced to 0.86%, and it is 62.1MPa that bond strength, which increases,.Coating table The Y in face2O3Content significantly increase, Y2O3Usually as oxidation dispersion strengthening phase, the intensity of material can be effectively improved.Therefore, After 1100 DEG C of heat treatments, the microhardness of coating is up to 371.1HV, wear rate minimum 1.6 × 10-5mm3/ N.m, meanwhile, There is excellent antioxygenic property under 900 DEG C of hot conditions.
A kind of high-temperature wearable of the present invention damages oxidation susceptibility coating production, and the tissue of coating is effectively improved by being heat-treated Structure, reduce coating in crackle and stomata the defects of, can further improve the comprehensive performance of coating；Specific step is as follows:
S1, substrate cutting and cleaning
718 high temperature alloy of Choice of substrate materials Inconel of test process floating coat, first with wire cutting machine by substrate Material bar is cut intoSample, polished specimen surface with sand paper, then will have been polished Sample is cleaned by ultrasonic 20~60min in alcohol, removes the grease stain of specimen surface；
S2, sample blasting treatment
Before spraying, blasting treatment is carried out to cleaned sample, it, will after sandblasting to improve the bond strength of coating Sample is cleaned by ultrasonic in alcohol, and the remaining sand of specimen surface is cleaned up；
The sand of blasting treatment uses corundum, and partial size is 50~100 μm.
S3, spraying
Before spraying, powder is subjected to drying and processing in a vacuum drying oven first, to guarantee that powder feeding is smooth in spraying process.
What spray test carried out on the SulZer Metco 9M instrument in laboratory, before spray test, first to sample into Row the pre-heat treatment carries out spray test when sample is preheated to 300~500 DEG C；
Dusty spray used in test process is Sulzer Metco finished product MCrAlY powder, and powder diameter range is 53 ~106 μm, sphericity is preferable, has preferable mobility, it is ensured that powder feeding is smooth in spraying process, will before spray treatment Sulzer Metco powder carries out drying and processing in a vacuum drying oven, and drying temperature is 40~60 DEG C, and vacuum degree is 1 × 10- 1Pa~6 × 10-1Pa, using atmospheric plasma spraying technology prepares coating, coating with a thickness of 320~380 μm；
In spraying process, while spray gun is mobile, sample is fixed on turntable, allows its high-speed rotation, velocity of rotation For 200~300r/min, coating hot-spot can be prevented；
In spraying process, Ar flow is 38~45L/min, H2Flow be 4.5~6L/min, 80~100 ° of spray angle, Powder feeding rate is 40~45g/min, 500~550A of electric current, 50~60V of voltage, 100~110mm of spray distance；
S4, heat treatment
The sample sprayed is subjected to heat-treatment furnace in vacuum heat treatment furnace, then furnace cooling obtains dense structure Uniformly, bond strength is high, with the coating of superior abrasion resistance and antioxygenic property under high temperature.
The vacuum degree of heat treatment is 10-2Pa, temperature are 800~1200 DEG C, and heating rate is 8~12 DEG C/min, when heat preservation Between be 0.5~3.5h.
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention In attached drawing, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is A part of the embodiment of the present invention, instead of all the embodiments.The present invention being described and shown in usually here in attached drawing is real The component for applying example can be arranged and be designed by a variety of different configurations.Therefore, below to the present invention provided in the accompanying drawings The detailed description of embodiment be not intended to limit the range of claimed invention, but be merely representative of of the invention selected Embodiment.Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts The every other embodiment obtained, shall fall within the protection scope of the present invention.