CN107916389B - A kind of micron order supersonic speed suspension plasma spray apparatus and spraying method - Google Patents
A kind of micron order supersonic speed suspension plasma spray apparatus and spraying method Download PDFInfo
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- CN107916389B CN107916389B CN201711135836.2A CN201711135836A CN107916389B CN 107916389 B CN107916389 B CN 107916389B CN 201711135836 A CN201711135836 A CN 201711135836A CN 107916389 B CN107916389 B CN 107916389B
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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
- C23C4/12—Coating by spraying the coating material in the molten state, e.g. by flame, plasma or electric discharge characterised by the method of spraying
- C23C4/134—Plasma spraying
Abstract
The present invention relates to a kind of micron order supersonic speed suspension plasma spray apparatus and spraying methods, the interior feeding powder feeding design of " pin-hole type " proposed, the Wei Fen mechanism that Laval type plasma gun is commonly used in engineering is transformed, by rational proportion dusty spray (partial size 500nm~150 μm), dehydrated alcohol, additive and deionized water, sufficiently suspension and stable liquid slurry are obtained；" needle-like " interior spout of suspension liquid slurry pipeline transport to improved supersonic speed Laval spray gun is deposited on substrate through supersonic spray coating process after with supersonic speed plasma jet sufficient heat exchange occurs for suspension slurry and forms coating using mechanical creeping pump.The partial size of sprayed particle needed for the present invention can reach 5~7 μm/passage without limitation, deposition efficiency up to 150 μm, to the pattern, phosphoric acid and fluidity of dusty spray, and coating preparation efficiency can be improved nearly 7 times.
Description
Technical field
The invention belongs to Surface Engineering field, it is related to a kind of micron order supersonic speed suspension plasma spray apparatus and spraying side
Method is a kind of suspension plasma spraying new technology for preparing the coatings such as micro-ceramic, intermetallic compound that universality is strong
Background technique
Atmospheric plasma spraying technology has important answer in terms of preparing thermal barrier coating, antioxidant coating and biological coating
With value, but the state of microstructure of plasma sprayed material and property limitation are more, for example spraying raw material must be dry powdered solid
State, to meet certain powder diameter, flow of powder degree and apparent density moderate etc., this to the preparation process of dusty spray propose compared with
High requirement.The preparation of dusty spray is generally chemically synthesized, is aged, mist projection granulating (nodularization), calcining, crushing, ball milling, dividing
A series of cumbersome process flows such as grade, not only the rate of recovery of powder is low, but also the cost of powder is high, limit etc. from
The exploitation of sub- spray-on coating system.The appearance of suspension plasma spraying technology solves the wall to the limitation of dusty spray high request
It builds, to powder strong applicability easy to reunite and poor fluidity, but the partial size of dusty spray is still required that relatively high, i.e., must be
Sub-micron or nanometer grade powder limit the popularization and application of suspension plasma spraying technology to a certain extent.
Patent 1 " prepares the injection type plasma spraying device of hydroxyapatite bioactive coating, CN 101250682A "
A kind of method for preparing hydroxyapatite coating layer using external pouring-in feeding manner is disclosed, has synthesized hydroxyl using wet chemistry method
Base apatite solution, is injected into plasma jet for suspension using compressed air in pressurized tank, realizes in biologically inert
Medical metal material surface prepares hydroxyapatite coating layer purpose.But this method does not have the spraying of dusty spray slurry pervasive
Property, the suspension slurry of chemical synthesis preparation is only applicable to using precursor solution prepares coating, and requires uniform suspension
Good, particle scale is in nanoscale, and which has limited the popularization and use of other dusty sprays.A kind of " the hydroxyapatite coating layer of patent 2
Preparation method, CN 105648390A " has widened the spraying only limitation to hydroxyapatite presoma that suspends, to hydroxy-apatite
The external method that is radially injected of stone powder has good effect, and the use scope for the spraying that suspends is promoted.But CN
105648390A technology to remaining spraying system without being related to, and requires dusty spray grain only specific to hydroxyapatite system
Diameter is under 1 μm, and for feeding flow in ml/min magnitude, coating preparation efficiency is lower.
" the Liquid plasma sprayed nano-network La of document 10.4Sr0.6Co0.2Fe0.8O3/
Ce0.8Gd0.2O2composite as a high-performance cathode for intermediate-
temperature solid oxide fuel cells,S Zhang,C Li,et al.2016,Journal of Power
Sources " reports a kind of using interior drawing-in device preparation La0.4Sr0.6Co0.2Fe0.8O3/Ce0.8Gd0.2O2The side of composite coating
Method, spraying liquid material contain the mixed solution of precursor solution and nanoparticle suspension particle, and this report has further expanded suspension etc.
The particle range of choice of plasma spray raw material, but the partial size of spraying raw material is still in Nano grade；" the Effects of of document 2
processing parameters on thedeposition of yttria partially stabilized
zirconia coating during suspension plasma spray,X.Chen,S.Kuroda,et al.2016,
Journal of the American Ceramic Society " carries out suspension plasma spraying using radial feeding mode, sprays
The average particle size for applying powder is 400nm, the dispersion of slurry solution and viscosity need in technical process strict control, be otherwise easy stifled
Fill in feeding path.
For the application limitation for widening suspension plasma spraying feeding powder nanometer scale, it is necessary to from suspension slurry property and hang
Two aspect of powder conveying of feeding of buoyant slurry is improved and is promoted.The powder of nanoscale is widened to micron level, on the one hand must
The heat exchange that suspension slurry and plasma jet must sufficiently be improved promotes the fusing and deposition of micron powder；On the other hand it uses
The inside feeding type powder feeding of diameter can effectively improve " turbulence effect " when suspension slurry and plasma jet collision, improve heat and hand over
Transducing power.Therefore the present invention selects Laval type superonic flow nozzzle, is carried out using radial direction " needle-like " interior feeding manner to suspension liquid material
Powder feeding is able to solve the problem that suspension plasma spraying limits powder nanometer and submicron order.In addition, the present invention changes spray gun
It makes simply, lower to the stability requirement of dusty spray partial size, powder shape and suspension slurry, suitable large-scale promotion is answered
With.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of micron order supersonic speed suspension plasma spray coating
It sets and spraying method, solution suspension plasma spraying limits the technology of dusty spray nanometer and submicron order partial size (< 500nm)
System widens the feeding partial size of suspension plasma spraying powder to micron order, improves suspension plasma spraying to the general of sprayed on material
Adaptive.
Technical solution
A kind of micron order supersonic speed suspension plasma spray apparatus, including Laval type spray gun 4, powder feeding mechanism 5, gaseous mixture
Body entrance 1, circulating cooling water inlet 2；Powder feeding mechanism 5 includes suspension slurry pump intake 10, interior spout 7 and needle-like powder feeder
13；The exit side wall of Laval type spray gun 4 is equipped with spout 7 in duct, and needle-like powder feeder 13 is placed in interior spout 7, and with it is outer
The suspension slurry pump intake 10 in portion is connected to；The feed direction of the needle-like powder feeder 13 and the plasma jet of Laval type spray gun 4
Central axes positive direction angle is greater than 100 °.
The needle-like mouth internal diameter of the needle-like powder feeder 13 is 0.5~1.5mm.
The needle-like powder feeder 13 uses specification for the commercially available precision stainless steel dispensing needle head of 12~20G.
The method sprayed according to any micron order supersonic speed suspension plasma spray apparatus, it is characterised in that
Steps are as follows:
Step 1: the needle-like powder feeder for the slurry that suspends being placed in Laval type plasma gun duct spout 7, adjustment is fed
Expect that the central axes positive direction angle of direction and plasma jet is greater than 100 °；
Step 2: by the powder of 10~24wt.%, the dehydrated alcohol of 10~24wt.%, 0.1~1wt.% binder and
The deionized water mixed preparing of 51~79.9wt.% obtains suspension slurry；The partial size of the powder is 500nm~150 μm；
Step 3: by mixed gas entrance 1 to carrier gas is passed through in spray gun, being pumped using mechanical creeping and be passed through suspension slurry
Suspension slurry pump intake 10, and pass through the spray gun channel that needle-like powder feeder 13 enters Laval type spray gun 4；The feeding operations must
It must implement after carrier gas is passed through；
Step 4: the flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, so that liquid material occurs in gun slot
When " uniform atomizing " phenomenon, the starting high frequency starting the arc generates plasma, forms plasma jet；
Step 5: according to the powder sprayed, controlling power, spray distance and the mechanical creeping pump of suspension plasma spraying
Revolving speed sprays to form coating in substrate surface；The thickness of coating is regulated and controled by changing the mobile number of spray gun.
Beneficial effect
A kind of micron order supersonic speed suspension plasma spray apparatus and the spraying method proposed by the present invention, " pin hole of proposition
The interior feeding powder feeding design of type ", is transformed the Wei Fen mechanism that Laval type plasma gun is commonly used in engineering, and expect suspending
Liquid material property in slurry is modified, solve conventional suspension plasma spraying just for raw material particle size nanoscale (<
500nm), slurry sufficiently suspends and fluidity height, the special high cost spray gun of need and deposition efficiency low (~1 μm/passage) etc. are asked
Topic, the partial size of sprayed particle needed for the present invention up to 150 μm, to the pattern, phosphoric acid and fluidity of dusty spray without limitation,
Deposition efficiency can reach 5~7 μm/passage, and coating preparation efficiency can be improved nearly 7 times.
Micron order proposed by the present invention, interior feeding suspension plasma spraying technology, to various micron order (particle size ranges
500nm~150 μm) dusty spray (the simple substance powders of ceramic powders, intermetallic compound and easy high-temperature oxydation) have it is higher
Applicability, develop a kind of wide scale (500nm~150 μm), interior feeding type supersonic speed suspension plasma spraying technology.The hair
It is bright can effectively solve plasma spray coat the powder period is long, suspension plasma spraying just for nanometer powder limitation and universality
The technical problems such as difference.And the design and transformation of powder feeding mechanism are reproducible, flexibility ratio is high, it can be ensured that micron order particles of solute
Effectively fusing, improves the fusing degree of dusty spray.
Detailed description of the invention
Fig. 1 is supersonic speed suspension plasma spraying construction and process schematic representation of the invention.1 enters in figure for mixed gas
Mouthful, 2 be circulating cooling water inlet, and 3 be plasma forming region, and 4 be Laval type spray gun, and 5 be powder feeding mechanism, and 6 penetrate for plasma
Stream, 7 be interior spout, and 8 be sedimentary, and 9 be substrate, and 10 be suspension slurry pump intake, and 11 be connector at powder feeding mouth, and 12 be fastening
Screw thread, 13 be needle-like powder feeding mouth, and 14 export for plasma gun, and 15 be plasma gun section, and 16 be spray gun outer sleeve.It suspends
Slurry pumps the interior spout 7 for being delivered to spray gun through 10, the central axes side of interior spout 7 and plasma jet 6 using mechanical creeping
It is greater than 100 ° to angle.During test operation, the stability of suspension slurry can be maintained with additional mechanical stirring.Arrow institute in Fig. 1
The present invention is shown as after part section, the design drawing of feeding powder feeding structure in needle-like, the present invention can be according to the flowing of suspension liquid material
Degree and granularity, the commercially available precision stainless steel dispensing needle head for selecting 12~20G not wait, therefore expand the choosing of dusty spray partial size
Select range.
Fig. 2: Fig. 2 (a) is the zirconic acid lanthanum powder that grain diameter is 7~90 μm, and since powder diameter is different, fluidity is poor,
It is not suitable for air plasma spraying.The preparation that powder in Fig. 2 (a) is carried out to suspension slurry is aided with mechanical stirring, and by figure
Interior feeding manner in 1 carries out the surface spraying on iron substrate, obtains such as the white zirconic acid lanthanum coating in Fig. 2 (b).From the above knot
Fruit show that the present invention can effectively widen the particle size range of suspension plasma spraying powder, complicated to poor fluidity, technique preparation
Ceramic powders may be implemented effectively to deposit.
Fig. 3 is the micron order MoSi using irregular pattern2Powder carries out the coating of suspension plasma spraying preparation.It can be seen that
The MoSi of 0.5~25 μm of particle size range in Fig. 3 (a)2Powder can be obtained with supersonic speed suspension plasma spraying technology of the invention
The intermetallic compound coating for being 100 ± 10 μm to coating layer thickness.
Fig. 4: suspension plasma spray is carried out to the cusped edge shape Si sprayed particle (Fig. 4 (a)) of easy high-temperature oxydation using the present invention
It applies, Si layers of spraying (Fig. 4 (b)) of even compact also can be obtained.In summary, micron order proposed by the present invention, interior feeding type are super
Velocity of sound suspension plasma spraying technology has higher applicability to various dusty sprays, is suitble to large-scale promotion application.
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
Detailed process of the invention are as follows:
1) interior feeding design is carried out to Laval type spray gun general in engineering, digital control hole drilling technology is utilized to change internal powder conveying
The angle in channel and nozzle central axes, it is ensured that the positive direction angle of feed direction and plasma jet is greater than 100 °；
2) using screw threads for fastening method interior feeding inlet be arranged a needle-like feeding port, needle-like mouth internal diameter be 0.5~
1.5mm.It uses specification for the commercially available precision stainless steel dispensing needle head of 12~20G, is inserted into spray gun feeding port, it is outstanding to form interior feeding type
Floating plasma gun；
3) configuration of suspension slurry being carried out to the spraying raw material that powder diameter is 500nm~150 μm, slurry compositions are 10~
24wt.% powder, 10~24wt.% dehydrated alcohol, 0.1~1wt.% binder and 51~79.9wt.% deionized water use
Full-automatic electric blender is stirred dispersion to powder slurry；
4) it is passed through carrier gas in spray gun, 3) will be fed in " needle-like " that suspension slurry in is delivered in 2) using mechanical creeping pump
Material mouth, it is ensured that be passed through after carrier gas and carry out feeding operations again；
5) flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, liquid material " uniform-mist occurs in gun slot
Change " phenomenon when, can the high frequency starting the arc generate plasma, formed plasma jet；
6) parameters such as power, spray distance and the mechanical creeping revolution speed of suspension plasma spraying are controlled, in substrate surface
Spraying forms coating；The thickness of coating can be regulated and controled by changing the mobile number of spray gun.
Case study on implementation 1
Step 1: the preparation of suspension zirconic acid lanthanum slurry: weighing the spherical shape that grain diameter is 7~90 μm respectively with electronic balance
Zirconic acid lanthanum powder, dehydrated alcohol, polyethyleneimine and deionized water, in mass ratio 0.20:0.20:0.05:0.55 are placed in opening
In beaker, be sufficiently stirred forming suspension slurry with full-automatic mechanical agitating device.Through detecting, the pH=8 of suspension slurry, surely
Qualitative and dispersibility is preferable；
Step 2: Fe-based substrate the surface preparation of Fe-based substrate: being cut into 10 × 10 × 2mm with wire cutting method3's
Blocky sample is several, and the 60 mesh emergy roughening treatments for being 0.3~0.5MPa with pressure, and removal substrate surface grease stain etc. is miscellaneous
Matter.Sandblasting angle is 60~90 °, and sandblasting distance is 5~10cm；After blasting treatment, it is cleaned by ultrasonic 30min with dehydrated alcohol, surpasses
Acoustic power is 80W.Substrate coupons after the above cleaning, which are put into 80 DEG C of baking ovens, to be dried for standby；
Step 3: inside suspension slurry pipeline transport to supersonic spray gun: improved " needle-like " interior feeding spray gun of the invention is utilized,
It is passed through carrier gas in spray gun and forms supersonic airstream；Suspension slurry in step 2 is delivered to Laval spray using mechanical creeping pump
" needle-like " interior spout of rifle；During suspension slurry pipeline transport, the dispersion of automatic stirring pump real-time control zirconic acid lanthanum slurry is utilized
And stability；The flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, liquid material " uniform-mist occurs in gun slot
It, can the high frequency starting the arc generation plasma when change " phenomenon；
Step 4: supersonic speed suspension plasma spraying prepares zirconic acid lanthanum coating: with Ar+H2For plasma gas, using high frequency
Voltage generates arc discharge and forms plasma jet.Adjusting spray power is 50kW, and peristaltic pump feeding revolving speed is 22r/min, spray
Applying distance is 90mm, and spray gun transverse shifting speed is 2500mm/s, and spraying number of repetition is 8 times.By aforementioned four step, In
White zirconic acid lanthanum coating is prepared on Fe-based substrate.As seen from Figure 2, dark-grey color base is completely covered in white zirconic acid lanthanum coating
Material, this show interior feeding supersonic speed suspension plasma spraying to the spray deposited significant effect of micron order zirconic acid lanthanum ceramic powders,
Widen and improve the technology scope that suspension plasma spraying is used just for nanoscale liquid material.
Case study on implementation 2
Step 1: the preparation of suspension zirconic acid lanthanum slurry: weighing the spherical shape that grain diameter is 7~90 μm respectively with electronic balance
Zirconic acid lanthanum powder, dehydrated alcohol, polyethyleneimine and deionized water, in mass ratio 0.22:0.22:0.05:0.51 are placed in opening
In beaker, be sufficiently stirred forming suspension slurry with full-automatic mechanical agitating device.Through detecting, the pH of suspension slurry is in 7
Between~8, stability and dispersibility are preferable；
Step 2: Fe-based substrate the surface preparation of Fe-based substrate: being cut into 10 × 10 × 2mm with wire cutting method3's
Blocky sample is several, and the 60 mesh emergy roughening treatments for being 0.3~0.5MPa with pressure, and removal substrate surface grease stain etc. is miscellaneous
Matter.Sandblasting angle is 60~90 °, and sandblasting distance is 5~10cm；After blasting treatment, it is cleaned by ultrasonic 30min with dehydrated alcohol, surpasses
Acoustic power is 80W.Substrate coupons after the above cleaning, which are put into 80 DEG C of baking ovens, to be dried for standby；
Step 3: inside suspension slurry pipeline transport to supersonic spray gun: improved " needle-like " interior feeding spray gun of the invention is utilized,
It is passed through carrier gas in spray gun and forms supersonic airstream；Suspension slurry in step 2 is delivered to Laval spray using mechanical creeping pump
" needle-like " interior spout of rifle；During suspension slurry pipeline transport, the dispersion of automatic stirring pump real-time control zirconic acid lanthanum slurry is utilized
And stability；The flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, liquid material " uniform-mist occurs in gun slot
It, can the high frequency starting the arc generation plasma when change " phenomenon；
Step 4: supersonic speed suspension plasma spraying prepares zirconic acid lanthanum coating: with Ar+H2For plasma gas, using high frequency
Voltage generates arc discharge and forms plasma jet.Adjusting spray power is 45kW, and peristaltic pump feeding revolving speed is 18r/min, spray
Applying distance is 120mm, and spray gun transverse shifting speed is 3000mm/s, and spraying number of repetition is 16 times.By aforementioned four step,
White zirconic acid lanthanum coating is equally successfully prepared on Fe-based substrate.
Case study on implementation 3
Step 1: the preparation of suspension molybdenum silicide slurry: weighing the silicon that grain diameter is 0.5~25 μm respectively with electronic balance
Change molybdenum powder, dehydrated alcohol, polyvinyl alcohol and deionized water, in mass ratio 0.20:0.20:0.05:0.55 and is placed in uncovered beaker
It is interior, be sufficiently stirred forming suspension slurry with full-automatic mechanical agitating device；
Step 2: niobium alloy substrate the surface preparation of niobium alloy substrate: being cut into 10 × 10 × 3mm3Blocky sample
It is several, through 40wt.% nitric acid acidwashing 10min, remove the impurity such as substrate surface grease stain；60 mesh for being 0.3~0.5MPa with pressure
Emergy roughening treatment.In sandblasting procedures, control emergy directional velocity it is vertical with specimen surface, sandblasting distance be 10~
20cm；After blasting treatment, it is cleaned by ultrasonic 20~30min, ultrasonic power 100W with dehydrated alcohol.Substrate after the above cleaning
Sample is put into 80 DEG C of baking ovens and is dried for standby；
Step 3: inside suspension molybdenum silicide slurry pipeline transport to supersonic spray gun: being sprayed using the improved interior feeding powder feeding of the present invention
Rifle, it is ensured that be passed through after carrier gas and carry out feeding operations again.Suspension slurry in step 2 is delivered to Laval using mechanical creeping pump
" needle-like " interior spout of spray gun；During suspension slurry pipeline transport, point of automatic stirring pump real-time control molybdenum silicide slurry is utilized
Scattered and stability；The flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, liquid material " uniform-mist occurs in gun slot
It, can the high frequency starting the arc generation plasma when change " phenomenon；
Step 4: supersonic speed suspension plasma spraying prepares silication molybdenum coating: with Ar+H2For plasma gas, using high frequency
Voltage generates arc discharge and forms plasma jet.Adjusting spray power is 40kW, and peristaltic pump feeding revolving speed is 22r/min, spray
Applying distance is 100mm, and spray gun transverse shifting speed is 1800mm/s, and spraying number of repetition is 20 times.By aforementioned four step,
The silication molybdenum coating of grey is prepared in niobium alloy substrate surface.As seen from Figure 3, the number of repetition for improving spraying can be effective
Thicken spray-on coating, silication molybdenum coating with a thickness of 100 ± 12 μm, and be tightly combined with substrate.
Case study on implementation 4
Step 1: the preparation of suspension molybdenum silicide slurry: weighing the silicon that grain diameter is 0.5~25 μm respectively with electronic balance
Change molybdenum powder, dehydrated alcohol, polyvinyl alcohol and deionized water, in mass ratio 0.22:0.22:0.05:0.51 are uniformly mixed, with complete
Automation agitating device carries out being sufficiently stirred to form suspension slurry；
Step 2: niobium alloy substrate the surface preparation of niobium alloy substrate: being cut into 10 × 10 × 3mm3Blocky sample
It is several, through 40wt.% nitric acid acidwashing 10min, remove the impurity such as substrate surface grease stain；60 mesh for being 0.3~0.5MPa with pressure
Emergy roughening treatment.In sandblasting procedures, control emergy directional velocity it is vertical with specimen surface, sandblasting distance be 10~
20cm；After blasting treatment, it is cleaned by ultrasonic 20~30min, ultrasonic power 100W with dehydrated alcohol.Substrate after the above cleaning
Sample is put into 80 DEG C of baking ovens and is dried for standby；
Step 3: inside suspension molybdenum silicide slurry pipeline transport to supersonic spray gun: being sprayed using the improved interior feeding powder feeding of the present invention
Rifle, it is ensured that be passed through after carrier gas and carry out feeding operations again.Suspension slurry in step 2 is delivered to Laval using mechanical creeping pump
" needle-like " interior spout of spray gun；During suspension slurry pipeline transport, point of automatic stirring pump real-time control molybdenum silicide slurry is utilized
Scattered and stability；The flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, liquid material " uniform-mist occurs in gun slot
It, can the high frequency starting the arc generation plasma when change " phenomenon；
Step 4: supersonic speed suspension plasma spraying prepares silication molybdenum coating: with Ar+H2For plasma gas, using high frequency
Voltage generates arc discharge and forms plasma jet.Adjusting spray power is 52kW, and peristaltic pump feeding revolving speed is 20r/min, spray
Applying distance is 120mm, and spray gun transverse shifting speed is 2200mm/s, and spraying number of repetition is 20 times.By aforementioned four step,
The silication molybdenum coating with a thickness of 100 ± 7 μm is prepared in niobium alloy substrate surface.
Case study on implementation 5
Step 1: the preparation of suspension silicon material slurry: weighing cusped edge shape grain diameter respectively with electronic balance is 25~150 μm
Silicon powder, dehydrated alcohol, polyethyleneimine and deionized water, in mass ratio 0.20:0.20:0.05:0.55 are uniformly mixed in opening
In beaker, be sufficiently stirred forming suspension slurry with full-automatic mechanical agitating device；
Step 2: the surface preparation of Fe-based substrate: by Fe-based substrate wire cutting at 10 × 10 × 2mm3Blocky sample
It is several, and the 60 mesh emergy roughening treatments for being 0.3~0.5MPa with pressure, the impurity such as removal substrate surface grease stain.Sandblasting angle
Degree is 50 °, and sandblasting distance is 10~15cm；After blasting treatment, it is cleaned by ultrasonic 30min with dehydrated alcohol, ultrasonic power is
65W.Substrate coupons after the above cleaning, which are put into 70 DEG C of baking ovens, to be dried for standby；
Step 3: suspension silicon material slurry is delivered to inside supersonic spray gun: being passed through carrier gas in Laval type nozzle and is formed Supersonic
Suspension slurry in step 2 is delivered to the interior spout of Laval spray gun by fast air-flow using mechanical creeping pump；Suspension slurry is defeated
During sending, the dispersion and stability of automatic stirring pump real-time control silicon material slurry are utilized；Adjust the carrier gas flux and interior in spray gun
The flow of feeding suspension slurry, liquid material, can high frequency starting the arc generation plasmas when " uniform atomizing " phenomenon occurs in gun slot；
Step 4: supersonic speed suspension plasma spraying prepares silicon coating: with Ar+H2For plasma gas, using high frequency voltage
It generates arc discharge and forms plasma jet.Adjusting spray power be 25kW, peristaltic pump feeding revolving speed be 15r/min, spraying away from
From for 90mm, spray gun transverse shifting speed is 2000mm/s, and spraying number of repetition is 5~10 times.By aforementioned four step, In
Spraying silicon coating is prepared on Fe-based substrate.As seen from Figure 4, spray silicon coating with a thickness of 10 ± 5 μm, this can pass through increasing
Add the number of repetition of spraying to reach coating to thicken.The embodiment shows interior feeding supersonic speed suspension plasma spraying to micron order
Irregularly, the spraying of oxidizable ceramic powders is equally applicable.
Claims (3)
1. a kind of method that micron order supersonic speed suspension plasma spray apparatus is sprayed, it is characterised in that: the spraying dress
It sets including Laval type spray gun (4), powder feeding mechanism (5), mixed gas entrance (1), circulating cooling water inlet (2)；Powder feeding mechanism
It (5) include suspension slurry pump intake (10), interior spout (7) and needle-like powder feeder (13)；The outlet side of Laval type spray gun (4)
Wall is equipped with spout (7) in duct, and needle-like powder feeder (13) is placed in interior spout (7), and is pumped into external suspension slurry
Mouth (10) connection；The feed direction of the needle-like powder feeder (13) and the plasma jet central axes of Laval type spray gun (4) are square
It is greater than 100 ° to angle；
Specific step is as follows for the method for the spraying:
Step 1: the needle-like powder feeder for the slurry that suspends being placed in Laval type plasma gun duct spout (7), feeding is adjusted
The central axes positive direction angle of direction and plasma jet is greater than 100 °；
Step 2: by the powder of 10~24wt.%, the dehydrated alcohol of 10~24wt.%, the binder of 0.1~1wt.% and 51~
The deionized water mixed preparing of 79.9wt.% obtains suspension slurry；The partial size of the powder is 500nm~150 μm；
Step 3: by mixed gas entrance (1) to being passed through carrier gas in spray gun, pumped using mechanical creeping suspension slurry is passed through it is outstanding
Buoyant stock pump entrance (10), and pass through the spray gun channel that needle-like powder feeder 13 enters Laval type spray gun 4；The feeding operations must
It must implement after carrier gas is passed through；
Step 4: the flow of the carrier gas flux and interior feeding suspension slurry in spray gun is adjusted, so that liquid material occurs " in gun slot
When even atomization " phenomenon, the starting high frequency starting the arc generates plasma, forms plasma jet；
Step 5: according to the powder sprayed, power, spray distance and the mechanical creeping revolution speed of suspension plasma spraying are controlled,
It sprays to form coating in substrate surface；The thickness of coating is regulated and controled by changing the mobile number of spray gun.
2. the method that micron order supersonic speed suspension plasma spray apparatus is sprayed, feature exist according to claim 1
In: the needle-like mouth internal diameter of the needle-like powder feeder (13) is 0.5~1.5mm.
3. the method that micron order supersonic speed suspension plasma spray apparatus is sprayed, feature exist according to claim 1
In: the needle-like powder feeder (13) uses specification for the commercially available precision stainless steel dispensing needle head of 12~20G.
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| CN201711135836.2A CN107916389B (en) | 2017-11-16 | 2017-11-16 | A kind of micron order supersonic speed suspension plasma spray apparatus and spraying method |
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| CN107916389B true CN107916389B (en) | 2019-11-22 |
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Citations (3)
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| CN102046303A (en) * | 2008-05-29 | 2011-05-04 | 西北美泰克公司 | Method and system for producing coatings from liquid feedstock using axial feed |
| CN202043371U (en) * | 2011-05-10 | 2011-11-16 | 上海大豪纳米材料喷涂有限公司 | Supersonic plasma spray gun |
| CN106016258A (en) * | 2016-06-23 | 2016-10-12 | 水利部杭州机械设计研究所 | Novel hypersonic flame spraying gun |
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| CN100478486C (en) * | 2006-04-30 | 2009-04-15 | 河海大学 | Method for plasma spraying of wearable coating for aluminium alloy matrix surface |
| CN101619434B (en) * | 2009-05-12 | 2011-04-13 | 四川大学 | Method for preparing porous hydroxylapatite coating by suspending liquid plasma spraying |
| CN103031508A (en) * | 2011-09-30 | 2013-04-10 | 中国农业机械化科学研究院 | Liquid feedstock plasma spraying device |
| CN102352477A (en) * | 2011-10-19 | 2012-02-15 | 西安建筑科技大学 | Method for performing supersonic atmospheric plasma spraying of zirconium oxide on surface of crystallizer copper plate |
| CN204817040U (en) * | 2015-07-31 | 2015-12-02 | 北京天诚宇新材料技术有限公司 | Double - circuit send whitewashed supersonic speed cold spraying device |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102046303A (en) * | 2008-05-29 | 2011-05-04 | 西北美泰克公司 | Method and system for producing coatings from liquid feedstock using axial feed |
| CN202043371U (en) * | 2011-05-10 | 2011-11-16 | 上海大豪纳米材料喷涂有限公司 | Supersonic plasma spray gun |
| CN106016258A (en) * | 2016-06-23 | 2016-10-12 | 水利部杭州机械设计研究所 | Novel hypersonic flame spraying gun |
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