CN104195492B - Wear-resistant and corrosion-resistant coating material and preparation method thereof, and coating and preparation method thereof - Google Patents
Wear-resistant and corrosion-resistant coating material and preparation method thereof, and coating and preparation method thereof Download PDFInfo
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- CN104195492B CN104195492B CN201410443321.9A CN201410443321A CN104195492B CN 104195492 B CN104195492 B CN 104195492B CN 201410443321 A CN201410443321 A CN 201410443321A CN 104195492 B CN104195492 B CN 104195492B
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Abstract
The invention discloses a wear-resistant and corrosion-resistant coating material and a preparation method thereof, and a coating and a preparation method thereof, and belongs to the technical field of thermal spraying. The coating material is powder particles and comprises 85-87 wt% of tungsten carbide powder, 8-11 wt% of cobalt powder and 2-7 wt% of chromium powder, wherein the grain size distribution of the tungsten carbide powder is as follows: d970.9 μm or less, D50.4 μm or more, D500.6 to 0.8 μm, and the free path d of the metal binding phase among the tungsten carbide powder grains is less than or equal to 0.5 μm. The preparation method of the coating material comprises the steps of adding deionized water, a defoaming agent and a bonding agent into raw materials, then carrying out mixing and ball milling to obtain mixed slurry, carrying out spray drying on the mixed slurry to obtain agglomerated particles, and then sintering and crushing the agglomerated particles to obtain the WC-10Co4Cr coating material, namely the wear-resistant and corrosion-resistant coating material. The coating prepared by the coating material can bear 150MPa of water pressure without leakage, and the neutral salt spray resistance test is more than 672 hours without rusty spots.
Description
Technical field
The present invention relates to a kind of wear-and corrosion-resistant coating material and preparation method and coating and preparation method, belong to thermal spraying skill
Art field.
Background technology
Tungsten carbide-base cermet material hardness is high, good toughness, and coating has excellent anti-wear performance, has been widely used
In industries such as Aero-Space, metallurgy, machineries.A certain amount of Cr is added in WC-Co cermets and forms WC-10Co4Cr sprays
Material is applied, the material improves corrosion resisting property while hard high-wearing feature is kept so that WC-10Co4Cr can be used for corruption
Wear Protection under erosion environment, particularly HVAF WC-10Co4Cr coating process can be used to substitute hard chrome plating work
Skill, thus application is increasingly extensive.
WC-10Co4Cr coatings to the protection of matrix except with coating material corrosion resistance in itself mutually outside the Pass also with coating
Consistency is related to the presence or absence of crackle.The corrosion resistance of WC-10Co4Cr is mainly determined by Cr, therefore the distribution of Cr elements is equal
Even property is the key for influenceing material corrosion resistance.The main production process of current WC-10Co4Cr is tungsten carbide powder, cobalt powder, chromium powder
Product is obtained by spray drying, sintering crushing after mixing by a certain percentage, the chromium powder for being used is general below 20 μm, D50
Between 12~15 μm, and the particle size range of WC-10Co4Cr is general at 15~45 μm, and single WC-10Co4Cr is if there is one
The chromium powder of bulky grain (being more than 10 μm) then easily causes the enrichment of Local C r, and this will cause the reduction of other positions Cr, drop
The overall corrosion resistance of low material, and for D50Chromium powder between 12~15 μm, the chromium powder for having more than half easily causes chromium
Local enrichment, therefore integral material to be easy to corrosion resistance not enough.
The consistency of WC-10Co4Cr coatings is together decided on by sprayed on material and spraying coating process, consistency and the spraying of coating
Molten condition and blending powder of the powder in flame stream are related, and the molten condition of powder is determined by powder raw material and spraying coating process
It is fixed.
The crackle of coating is mainly the crackle that the crackle or spraying last handling process of formation in spraying process cause, spraying
During improper process control, internal stress is also easy to produce in coating and causes micro-crack；Many workpiece have the requirement of surface roughness, because
This is required for carrying out grinding after WC-10Co4Cr coatings are sprayed, and the micro-crack in coating also has very big with grinding process
Relation, and the surface stress of coating hardness uniformity, coating is the main reason for causing grinding crackle, and coating
Uniformity of hardness and surface stress are determined by powder raw material and spraying coating process.Therefore in order to control, reduce coating
The micro-crack produced during micro-crack and post-processing in spraying process needs strict control powder material spray and spraying
Technique.
Existing tungsten carbide-base sprayed on material is distinguished from composition crystal grain can be divided into three kinds, and nanometer tungsten carbide sprayed on material is micro-
Rice tungsten carbide and nano-micrometre compound carbonizing tungsten.Nanometer tungsten carbide melting effect is good, and melting is uniform, and hardness is uniform, but easily carbon loss,
Form the M6C of fragility；Micron order tungsten carbide is main based on the tungsten carbide crystal grain of 1~3 μm of tungsten carbide or thicker, spraying process
Middle tungsten carbide carbon loss is less, and toughness preferably, but is also easy to produce internal stress；The tungsten carbide that nano-micrometre is mixed with is joined to spraying coating process
Number requires strict, coating densification, and overall flexibility is preferable, but internal stress skewness, and crackle is also easy to produce during post-processing.
HVAF is because the characteristics of its spraying rate is fast, ignition temperature is relatively low, being to be best suitable for spraying at present
The method of tungsten carbide-base cermet.Dusty spray heats acceleration in flame stream, in half molten state to strike matrix surface, because
This spraying parameter is closely related from the performance of tungsten carbide raw material, it is necessary to obtain optimised process ginseng according to different dusty sprays
Number.
In actual applications, the corrosion resistance of WC-10Co4Cr coatings also has a certain distance by use requirement, coating
The micro-crack that consistency, spraying process and process are caused is difficult to be effectively controlled, the water pressure resistance performance and salt tolerant of coating
Mist corrosive nature can't fully meet use requirement.
The content of the invention
Based on the problems of above-mentioned prior art, the present invention provides a kind of wear-and corrosion-resistant coating material and preparation method
With coating and preparation method, the micro-crack that can effectively control consistency, spraying process and the process of coating to cause makes coating
Corrosion resistance meet use requirement, such that it is able to solve the corrosion-resistant lack of homogeneity of material present in existing plasma spray technology,
Coating low density and easily there is the problem of micro-crack.
In order to solve the above technical problems, the present invention provides a kind of wear-and corrosion-resistant coating material, the coating material is powder
Grain, is made up of, wherein carbon the tungsten carbide powder, 8~11% cobalt powder and 2~7% chromium powder that are by weight percentage 85~87%
Changing tungsten powder grain size distribution is：D97Less than or equal to 0.9 μm, D5More than or equal to 0.4 μm, D50It is 0.6~0.8 μm, tungsten carbide powder
The free path d of metallic binding phase is less than or equal to 0.5 μm between crystal grain.
The present invention also provides a kind of preparation method of wear-and corrosion-resistant coating material, including：
Each raw material is taken by wear-and corrosion-resistant coating material formulation of the present invention；
Mixing and ball milling being carried out after adding deionized water, defoamer and bonding agent in the raw material, mixed slurry is obtained,
By the mixed slurry by prepared agglomerated particle after spray drying, then obtained by the agglomerated particle through oversintering and after crushing
WC-10Co4Cr coating materials be the wear-and corrosion-resistant coating material.
The present invention further provides a kind of wear-and corrosion-resistant coating, in the coating, tungsten carbide hard phase crystallite dimension D97It is less than
Equal to 0.9 μm, D5More than or equal to 0.4 μm, D50It is 0.6~0.8 μm, the free path d of metallic binding phase between tungsten carbide crystal grain≤
0.5μm。
The present invention further provides a kind of preparation method of wear-and corrosion-resistant coating, the method is with described in claim 1 or 2
Wear-and corrosion-resistant coating material be raw material, wear-and corrosion-resistant coating is obtained with HVAF technique.
Beneficial effects of the present invention are：By using grain size distribution D97Less than or equal to 0.9 μm, D5More than or equal to 0.4 μ
M, D50The tungsten carbide of the coating material, this grain size distribution is constituted for 0.6~0.8 μm of tungsten carbide powder and cobalt powder and chromium powder
Tungsten carbide dusty spray fusing degree is uniform during spraying process can be ensured, carbon loss is few, smaller additionally, due to tungsten carbide size, spray
Internal stress is not likely to produce during painting, so that preparing can effectively control consistency, spraying process and the process of coating will not
Cause the abrasion resistant and corrosion resistant coating of micro-crack.
Specific embodiment
The technical scheme in the embodiment of the present invention is clearly and completely described below, it is clear that described embodiment
Only a part of embodiment of the invention, rather than whole embodiments.Based on embodiments of the invention, ordinary skill
The every other embodiment that personnel are obtained under the premise of creative work is not made, belongs to protection scope of the present invention.
The present invention provides a kind of abrasion resistant and corrosion resistant coating material, is a kind of material for preparing tungsten carbide-base wear-resistant coating, can
For the coating of high pressure valve, the coating material be powder particle, by by weight percentage be 85~87% tungsten carbide powder, 8~
11% cobalt powder and 2~7% chromium powder composition, are a kind of ultracrystallite WC-CoCr powder, wherein tungsten carbide powder grain size distribution
For：D97Less than or equal to 0.9 μm, D5More than or equal to 0.4 μm, D50It is 0.6~0.8 μm, metallic binding phase between tungsten carbide powder crystal grain
Free path d be less than or equal to 0.5 μm.
In above-mentioned coating material, it is the chromium powder that 1~2 μm of cobalt powder and average grain diameter are 2.5~4 μm to use average grain diameter,
Can ensure that chromium powder is distributed in WC-CoCr powder using the chromium powder of granularity section substantially uniform, so as to avoid chromium powder segregation
Problem, the thinner chromium powder of granularity is big because of specific surface area, and oxygen content is high, the problems such as follow-up sintering can be caused difficult.
Preferably, in above-mentioned coating material, tungsten carbide powder accounts for the 86% of raw material gross weight, and cobalt powder accounts for raw material gross weight
10%, chromium powder accounts for the 4% of raw material gross weight.
Preferably, tungsten carbide powder uses average grain diameter for 0.8 μm of tungsten carbide powder；It is 1 μm that cobalt powder uses average grain diameter
Cobalt powder；Chromium powder uses average grain diameter for 3 μm of chromium powder.
The preparation method of above-mentioned wear-and corrosion-resistant coating material, comprises the following steps：
Each raw material is taken by above-mentioned wear-and corrosion-resistant coating material formulation, deionized water, defoamer is added in the feed and is glued
The prepared mixed slurry of mixing and ball milling is carried out after connecing agent, by the mixed slurry by prepared agglomerated particle after spray drying, then will
WC-CoCr powder as wear-and corrosion-resistant coating material that the agglomerated particle is obtained through oversintering and after crushing.
In the above method, the bonding agent of addition accounts for the 2~10% of the raw material gross weight.Deionized water (is situated between as wet-milling
Matter) and defoamer (froth breaking in wet-milling) can add in right amount, as long as meet the requirement of wet-milling.
Further, the embodiment of the present invention also provides a kind of wear-and corrosion-resistant coating, in the coating, tungsten carbide hard phase crystal grain
Dimension D97Less than or equal to 0.9 μm, D5More than or equal to 0.4 μm, D50It is 0.6~0.8 μm, metallic binding phase between tungsten carbide crystal grain
Free path d≤0.5 μm.Specifically, the coating can be formed using the spraying of above-mentioned coating material.
Further, the embodiment of the present invention also provides a kind of preparation method of wear-and corrosion-resistant coating, is that a kind of utilization is above-mentioned
The method that wear-and corrosion-resistant coating material prepares wear-and corrosion-resistant coating, the method is with above-mentioned wear-and corrosion-resistant coating material (i.e. WC-
CoCr powder) it is raw material, wear-and corrosion-resistant coating is obtained with HVAF technique.
In the above method, if HVAF technique is with kerosene as fuel, with the raw material (i.e. WC-CoCr powder)
Middle granularity section is raw material for 15~45 μm of powder, and compressed air pressure is more than 6.0kg, and flow is more than 8Lmin-1, oxygen
Flow is 880~900Lmin-1, kerosene oil flow is 0.36~0.38Lmin-1, away from being 300mm, spray gun translational speed is for spray
280mm·min-1；0.2~0.4mm of coating layer thickness.
In the above method, if HVAF technique with fuel gas as fuel (such as by taking propane as an example), with described
Granularity section is that 5~30 μm of powder is raw material in raw material (i.e. WC-CoCr powder), and compressed air pressure is more than 4kg, and flow is big
In 8Lmin-1, oxygen flow is 190~210Lmin-1, gas flow is 50~55Lmin-1, spray away from being 210mm, spray
Rifle translational speed is 300mmmin-1；0.2~0.4mm of coating layer thickness.
Wear-and corrosion-resistant coating layer thickness obtained in the above method is 0.2~0.4mm, and tolerance is 150MPa without leakage hydraulic pressure, resistance to
Neutral salt spray test is more than 672 hours without rust staining.
Coating material of the invention, with the tungsten carbide of 0.4~1 μm of average grain diameter, the cobalt powder peace of 1~2 μm of average grain diameter
The chromium powder of equal 2.5~4 μm of particle diameter is raw material, and the chromium powder using granularity section can ensure that chromium powder is distributed base in WC-10Co4Cr
This is uniform, and so as to avoid the problem of chromium powder segregation, the thinner chromium powder of granularity is big because of specific surface area, and oxygen content is high, after causing
The problems such as continuous sintering difficulty；Using average grain diameter in 0.4~0.8 μm of tungsten carbide can ensure spraying process tungsten carbide spray coating powder
Last fusing degree is uniform, and carbon loss is few, smaller additionally, due to tungsten carbide size, and internal stress is not likely to produce in spraying process.
During HVAF, according to dusty spray feature, using suitable spraying fuel and oxygen proportion,
Increase air supply, the suitable spray of matching away from spray gun translational speed, the workpiece that spraying causes can be slowed down and overheated, reduce spraying
The generation of crackle and spraying internal stress.
The present invention can be very good to solve the corrosion-resistant uniformity of material present in existing plasma spray technology, coating consistency
With the problem of micro-crack.
With reference to specific embodiment, the invention will be further described.
A kind of preparation method of high corrosion-resistant wear-resistant coating is the embodiment of the invention provides, it passes through to choose suitable particle size
Chromium powder, it is ensured that chromium being uniformly distributed in sprayed on material, improves the decay resistance of material；Granularity is chosen suitably to be carbonized
Tungsten powder powder stock, reduces decarburization, it is ensured that composite powder melting degree is uniform in spraying process, reduces the generation of spraying internal stress；
Suitable technological parameter is chosen according to powder feature, high-compactness, flawless is obtained, is easy to the tungsten carbide coating of post-processing.
It is described to be specifically included for preparing the preparation method of abrasion resistant and corrosion resistant coating：
Step 1, with WC (D97≤ 0.9 μm, D5>=0.4 μm, D50Be 0.6~0.8 μm), cobalt powder (1~2 μm), chromium powder (2.5
~4 μm) it is raw material, wherein WC accounts for the 86% of raw material gross weight, and cobalt powder accounts for the 10% of raw material gross weight, and chromium powder accounts for raw material gross weight
4%；
Step 2, adds appropriate deionized water for wet grinding media in above-mentioned raw materials, addition account for raw material gross weight 2~
10% polyvinyl alcohol, polyethylene glycol etc. are binding agent, add proper quantity of defoaming agent etc., and ball milling more than 24 hours is obtained compound
Slurry；
Step 3, by above-mentioned mixed slurry by after spray drying be obtained agglomerated particle, specifically by mixed slurry be input into from
Heart atomisation drying equipment is by being obtained agglomerated particle after spray drying；Wherein, the import of centrifugal atomizing spray drying device
180~280 DEG C of temperature, 100~190 DEG C of outlet temperature, atomizing disk 5000~20000r/min of rotating speed, feeding amount 100~
400ml/min；
Step 4, is sintered to above-mentioned agglomerated particle, specifically agglomerated particle is placed in vacuum degumming stove and is heated,
800 DEG C be incubated more than 1 hour, then 1150~1250 DEG C sintering, insulation 2 hours after cool to 100 DEG C with the furnace at after come out of the stove,
Complete sintering；
Step 5, by the blank crushing and screening classification after sintering, obtains the powder of use requirement particle diameter.
Step 6, when the HVAF system with kerosene as fuel is used, with granularity in above-mentioned WC-10Co4Cr
Section is raw material for 15~45 μm of powder, and 6.0kg is more than with compressed air pressure, and flow is more than 8Lmin-1, oxygen flow
880~900Lmin-1, 0.36~0.38Lmin of kerosene oil flow-1, spray away from 300mm, spray gun translational speed 280mmmin-1；
When the HVAF system with fuel gas as fuel is used, with granularity section in above-mentioned WC-10Co4Cr for 5~30 μ
The powder of m is raw material, and 4kg is more than with compressed air pressure, and flow is more than 8Lmin-1, 190~210L of oxygen flow
min-1, 50~55Lmin of gas flow-1(by taking propane as an example), sprays away from 210mm, spray gun translational speed 300mmmin-1；System
Standby thickness is the coating of 0.25~0.35mm.
The technical scheme provided using this specific embodiment, can prepare and be suitable for the painting of high corrosion resistant tungsten carbide
Layer, coating can bear 150MPa hydraulic pressure without leakage, and resistance to neutral salt spray test is more than 672 hours without rust staining.
Detailed is made to the preparation method for abrasion resistant and corrosion resistant coating proposed by the present invention below by specific embodiment
Explanation.
Embodiment 1：
With WC (D97=0.9 μm, D5=0.4 μm, D50=0.6 μm), cobalt powder (D50=1 μm), chromium powder (D50=3 μm) it is original
Material, 86%, the Co powder that wherein WC accounts for raw material gross weight accounts for 10%, the Cr powder of raw material gross weight and accounts for the 4% of raw material gross weight；Will
WC, Co, Cr mixing and ball milling, it is wet grinding media to add appropriate deionized water, and addition accounts for the polyethylene of mixed-powder gross weight 10%
Alcohol and polyethylene glycol are binding agent, add proper quantity of defoaming agent etc., ball milling 24 hours；Mixed slurry input centrifugal atomizing spraying is dry
Dry equipment, 270 DEG C of inlet temperature, 180 DEG C of outlet temperature, atomizing disk rotating speed 18000r/min, feeding amount 300ml/min are going out
Agglomerated particle is obtained at mouthful；Particle after reunion is placed in vacuum degumming stove, is vacuumized, vacuum starts to add when being less than 3Pa
Heat, 1 hour is incubated when being heated to 800 DEG C, then heats to 1250 DEG C of sintering, insulation cool to 100 DEG C with the furnace after 2 hours at after
Come out of the stove；By the blank crushing and screening classification after sintering, 15~45 μm of powder is chosen as finished product.Use with kerosene as fuel
HVAF system prepares coating, compressed air pressure 0.65MPa, flow 8Lmin-1, oxygen flow 880L
min-1, kerosene oil flow 0.36Lmin-1, spray away from 300mm, spray gun translational speed 280mmmin-1.Coating microhardness is average
Value HV0.3>=1200, minimum value HV0.3>=1100, coating can bear 150MPa hydraulic pressure without leakage, and resistance to neutral salt spray test is more than
672 hours without rust staining.
Embodiment 2：
With WC (D97=0.85 μm, D5=0.6 μm, D50=0.7 μm), cobalt powder (D50=1 μm), chromium powder (D50=2.5 μm) be
86%, the Co powder that raw material, wherein WC account for raw material gross weight accounts for 10%, the Cr powder of raw material gross weight and accounts for the 4% of raw material gross weight；Will
WC, Co, Cr mixing and ball milling, it is wet grinding media to add appropriate deionized water, and addition accounts for the polyethylene of mixed-powder gross weight 10%
Alcohol and polyethylene glycol are binding agent, add proper quantity of defoaming agent etc., ball milling 24 hours；Mixed slurry input centrifugal atomizing spraying is dry
Dry equipment, 270 DEG C of inlet temperature, 180 DEG C of outlet temperature, atomizing disk rotating speed 18000r/min, feeding amount 300ml/min are going out
Agglomerated particle is obtained at mouthful；Particle after reunion is placed in vacuum degumming stove, is vacuumized, vacuum starts to add when being less than 3Pa
Heat, 1 hour is incubated when being heated to 800 DEG C, then heats to 1200 DEG C of sintering, insulation cool to 100 DEG C with the furnace after 2 hours at after
Come out of the stove；By the blank crushing and screening classification after sintering, 5~30 μm of powder is chosen as finished product.Use with fuel gas (with third
As a example by alkane) it is the HVAF system prepares coating of fuel, with compressed air pressure 0.5MPa, flow is more than 8L
min-1, oxygen flow 200Lmin-1, propane flow 50Lmin-1, spray away from 210mm, spray gun translational speed 300mmmin-1；
Prepare the coating that thickness is 0.25~0.35mm.Coating microhardness average value HV0.3>=1200, minimum value HV0.3>=1100, apply
Layer can bear 150MPa hydraulic pressure without leakage, and resistance to neutral salt spray test is more than 672 hours without rust staining.
Embodiment 3：
With WC (D97=0.9 μm, D5=0.6 μm, D50=0.75 μm), cobalt powder (D50=2 μm), chromium powder (D50=4 μm) it is original
Material, 86%, the Co powder that wherein WC accounts for raw material gross weight accounts for 10%, the Cr powder of raw material gross weight and accounts for the 4% of raw material gross weight；Will
WC, Co, Cr mixing and ball milling, it is wet grinding media to add appropriate deionized water, and addition accounts for the polyethylene of mixed-powder gross weight 10%
Alcohol and polyethylene glycol are binding agent, add proper quantity of defoaming agent etc., ball milling 24 hours；Mixed slurry input centrifugal atomizing spraying is dry
Dry equipment, 270 DEG C of inlet temperature, 180 DEG C of outlet temperature, atomizing disk rotating speed 18000r/min, feeding amount 300ml/min are going out
Agglomerated particle is obtained at mouthful；Particle after reunion is placed in vacuum degumming stove, is vacuumized, vacuum starts to add when being less than 3Pa
Heat, 1 hour is incubated when being heated to 800 DEG C, then heats to 1230 DEG C of sintering, insulation cool to 100 DEG C with the furnace after 2 hours at after
Come out of the stove；By the blank crushing and screening classification after sintering, 15~45 μm of powder is chosen as finished product.Use with kerosene as fuel
HVAF system prepares coating, compressed air pressure 0.7MPa, flow 8Lmin-1, oxygen flow 900Lmin-1, kerosene oil flow 0.38Lmin-1, spray away from 300mm, spray gun translational speed 280mmmin-1.Coating microhardness average value
HV0.3>=1200, minimum value HV0.3>=1100, coating can bear 150MPa hydraulic pressure without leakage, and resistance to neutral salt spray test is more than 672
Hour is without rust staining.
The above, the only present invention preferably specific embodiment, but protection scope of the present invention is not limited thereto,
Any one skilled in the art in the technical scope of present disclosure, the change or replacement that can be readily occurred in,
Should all be included within the scope of the present invention.Therefore, protection scope of the present invention should be with the protection model of claims
Enclose and be defined.
Claims (11)
1. a kind of wear-and corrosion-resistant coating material, it is characterised in that the coating material is powder particle, by being by weight percentage
86% tungsten carbide powder, 10% cobalt powder and 4% chromium powder are constituted, and wherein tungsten carbide powder grain size distribution is：D97Less than etc.
In 0.9 μm, D5More than or equal to 0.4 μm, D50It it is 0.6~0.8 μm, the free path d of metallic binding phase is small between tungsten carbide powder crystal grain
In equal to 0.5 μm；The cobalt powder uses average grain diameter for 1 μm of cobalt powder；The chromium powder uses average grain diameter for 3 μm of chromium powder.
2. a kind of preparation method of wear-and corrosion-resistant coating material, it is characterised in that including：
Formula as described in claim 1 takes each raw material；
Mixing and ball milling is carried out after adding deionized water, defoamer and bonding agent in the raw material and mixed slurry is obtained, by institute
Mixed slurry is stated by prepared agglomerated particle after spray drying, then obtained by the agglomerated particle through oversintering and after crushing
WC-10Co4Cr coating materials are the wear-and corrosion-resistant coating material.
3. the preparation method of wear-and corrosion-resistant coating material according to claim 2, it is characterised in that the bonding of the addition
Agent accounts for the 2~10% of the raw material gross weight.
4. the preparation method of the wear-and corrosion-resistant coating material according to Claims 2 or 3, it is characterised in that the bonding agent
Using any one in polyvinyl alcohol, polyethylene glycol.
5. the preparation method of the wear-and corrosion-resistant coating material according to Claims 2 or 3, it is characterised in that it is described will be described
Mixed slurry by after spray drying be obtained agglomerated particle be：
The mixed slurry is input into centrifugal atomizing spray drying device by agglomerated particle is obtained after spray drying；Wherein, institute
It is 180~280 DEG C to state the inlet temperature of centrifugal atomizing spray drying device, and outlet temperature is 100~190 DEG C, atomizing disk rotating speed
It is 5000~20000r/min, feeding amount is 100~400ml/min.
6. the preparation method of the wear-and corrosion-resistant coating material according to Claims 2 or 3, it is characterised in that described to described
Agglomerated particle is sintered to：
The agglomerated particle is placed in vacuum degumming stove and is heated, more than 1 hour is incubated at 800 DEG C, then 1150~1250
DEG C sintering, insulation 2 hours after cool to 100 DEG C with the furnace at after come out of the stove, complete sintering.
7. a kind of wear-and corrosion-resistant coating, it is characterised in that it is powder particle that the coating uses coating material, by by weight percentage
It is that 85~87% tungsten carbide powder, 8~11% cobalt powder and 2~7% chromium powder are constituted, wherein, it is 1~2 μ to use average grain diameter
The cobalt powder and average grain diameter of m are 2.5~4 μm of chromium powder；In the coating, tungsten carbide hard phase crystallite dimension D97Less than or equal to 0.9 μ
M, D5More than or equal to 0.4 μm, D50It is 0.6~0.8 μm, free path d≤0.5 μm of metallic binding phase between tungsten carbide crystal grain.
8. a kind of preparation method of wear-and corrosion-resistant coating, it is characterised in that the method is with the wear-and corrosion-resistant described in claim 1
Coating material is raw material, and wear-and corrosion-resistant coating is obtained with HVAF technique.
9. the preparation method of wear-and corrosion-resistant coating according to claim 8, it is characterised in that the HVAF
Technique, with kerosene as fuel, is 15~45 μm of powder as raw material with granularity section in the raw material, and compressed air pressure is more than
6.0kg, flow is more than 8Lmin-1, and oxygen flow is 880~900Lmin-1, and kerosene oil flow is 0.36~0.38L
Min-1, away from being 300mm, spray gun translational speed is 280mmmin-1 for spray.
10. the preparation method of wear-and corrosion-resistant coating according to claim 8, it is characterised in that the supersonic flame spray
Technique is applied with fuel gas as fuel, is 5~30 μm of powder as raw material with granularity section in the raw material, compressed air pressure
More than 4kg, flow is more than 8Lmin-1, and oxygen flow is 190~210Lmin-1, and gas flow is 50~55Lmin-
1, away from being 210mm, spray gun translational speed is 300mmmin-1 for spray.
The preparation method of the 11. wear-and corrosion-resistant coating according to any one of claim 8 to 10, it is characterised in that the side
Wear-and corrosion-resistant coating layer thickness obtained in method is 0.2~0.4mm, and tolerance is 150MPa without leakage hydraulic pressure, and resistance to neutral salt spray test is big
In 672 hours without rust staining.
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| RU2794069C1 (en) * | 2022-09-15 | 2023-04-11 | Виталий Вадимович Зарубин | Method for producing composite powder based on titanium carbide |
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| RU2794069C1 (en) * | 2022-09-15 | 2023-04-11 | Виталий Вадимович Зарубин | Method for producing composite powder based on titanium carbide |
| RU2807156C1 (en) * | 2023-01-29 | 2023-11-09 | Михаил Андреевич Вертен | Method for producing composite material for wear-resistant coating |
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