CN111545745A - Centrifugal composite roller surface high-temperature-resistant coating and production process thereof - Google Patents
Centrifugal composite roller surface high-temperature-resistant coating and production process thereof Download PDFInfo
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- CN111545745A CN111545745A CN202010424644.9A CN202010424644A CN111545745A CN 111545745 A CN111545745 A CN 111545745A CN 202010424644 A CN202010424644 A CN 202010424644A CN 111545745 A CN111545745 A CN 111545745A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F1/00—Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties
- B22F1/10—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material
- B22F1/107—Metallic powder containing lubricating or binding agents; Metallic powder containing organic material containing organic material comprising solvents, e.g. for slip casting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F5/00—Manufacture of workpieces or articles from metallic powder characterised by the special shape of the product
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/02—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers
- B22F7/04—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of composite layers with one or more layers not made from powder, e.g. made from solid metal
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- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
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- C22C30/00—Alloys containing less than 50% by weight of each constituent
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Abstract
The invention discloses a centrifugal composite roller surface high-temperature-resistant coating and a production process thereof, belonging to the technical field of coatings and comprising the following components in percentage by weight: the composite roll comprises tungsten carbide, cobalt base, boron nitride, chromium, cohesion reducing additives and a solvent, wherein the content of the tungsten carbide is 20-38%, the content of the cobalt base is 5-23%, the content of the boron nitride is 7-15%, the content of the chromium is 12-16%, the content of the cohesion reducing additives is 7-11% and the content of the solvent is 15-25%, the prepared tungsten carbide, cobalt base, boron nitride, chromium and cohesion reducing additives are used as the neutralizing solvent, the water is used for reducing the cohesion reducing additives and the solvent, the composite roll has quick curing performance and excellent adhesive force, the stability of the PH value is effectively controlled through the water, the corrosivity of the surface of the centrifugal composite roll can be relieved, and the high temperature resistance and the corrosion resistance of metal materials of the tungsten carbide, cobalt base and chromium are matched.
Description
Technical Field
The invention relates to the technical field of coatings, in particular to a high-temperature-resistant coating on the surface of a centrifugal composite roller and a production process thereof.
Background
The traditional furnace roller coating uses a coating component system of CoCrAlY-CrB2/Y2O3The spraying method is supersonic speed or plasma, and because the coating gap is large, the surface is not treated after spraying, and the roller surface has accumulated lumps after 2-3 months of use, and because the two spraying methods have large coating gap, the roller surface has accumulated lumps after being used for 2-3 monthsThe binding force of the coating is low, and the coating is easy to peel off. In addition, there are many documents describing the addition of CrB to spray materials2，CrB2Do help against nodules, however, CrB2The compound has a low melting point, can be decomposed at about 800 ℃ generally, and forms free boron, the boron can be adhered to the surface of a furnace roller at a low temperature section behind the furnace roller along with the running of the strip steel, and at a low temperature (450-650 ℃), the boron is combined with salt mist and acetic acid on the roller surface and solidifies bubbles, and the compound is firmly adhered to the roller surface, namely nodules.
Disclosure of Invention
The invention aims to provide a high-temperature-resistant coating on the surface of a centrifugal composite roller and a production process thereof, wherein the high-temperature-resistant coating can slow down the corrosivity of the surface of the centrifugal composite roller by effectively controlling the stability of the pH value through the aid of a water-reducing cohesion auxiliary agent, and solves the problems in the background technology by matching with the high-temperature resistance and the corrosion resistance of tungsten carbide, cobalt-based metal and chromium metal materials.
In order to achieve the purpose, the invention provides the following technical scheme: a centrifugal composite roller surface high-temperature-resistant coating comprises the following components in percentage by weight: the material comprises 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent.
Further, the content of tungsten carbide is 25-30%, the content of cobalt is 10-17%, the content of boron nitride is 11-13%, the content of chromium is 13-15%, the content of cohesion-reducing auxiliary agent is 8-10%, and the content of solvent is 16-20%.
Further, the content of tungsten carbide was 28%, cobalt group was 14%, boron nitride was 12%, chromium was 14%, cohesion reduction aid was 9% and solvent was 18%.
Further, DMF, TOL, MEK, EAC, IPA and water were used as the solvent.
Further, the cohesion-reducing additives are low molecular weight polymers, such as aldehyde ketone resins and low molecular PE waxes.
The invention provides another technology, which comprises a production process of a high-temperature-resistant coating on the surface of a centrifugal composite roller, and comprises the following steps:
s1: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
s2: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, the boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, and cooling to form powdery particles;
s3: pouring the solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding the curing agent, and stirring uniformly to prepare a precursor mixed liquid;
s4: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
s5: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
s6: and uniformly spraying or brushing the turbid liquid on the surface of the centrifugal composite roller, and performing preheating and sintering treatment on the substrate sprayed or brushed with the coating to obtain a layer of high-temperature-resistant coating with uniform thickness and compact structure on the substrate.
Further, in step S2, the atomizing pressure is increased to increase the speed of the atomizing air flow, destroy the surface and power balance thereof, complete the secondary atomization, and form metal powder particles with smaller diameter, and the metal powder particles are separated by the turbine classifier to obtain powder with a particle size of 300 mesh.
Further, the curing agent is low molecular polyamide, aliphatic diamine or aromatic polyamine.
Compared with the prior art, the invention has the beneficial effects that: according to the high-temperature-resistant coating on the surface of the centrifugal composite roller and the production process thereof, the prepared tungsten carbide, cobalt-based, boron nitride, chromium and cohesion reducing additive are used as a neutralizing solvent, water is used for reducing the cohesion auxiliary and the neutralizing solvent, the coating has quick curing property and excellent adhesive force, the stability of the pH value is effectively controlled through the water is used for reducing the cohesion auxiliary, the corrosion of the surface of the centrifugal composite roller can be relieved, and the high-temperature resistance and the corrosion resistance of metal materials of the tungsten carbide, the cobalt-based and the chromium are matched.
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FIG. 1 is a process flow diagram of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1, a centrifugal composite roller surface high temperature resistant coating comprises the following components in percentage by weight: the material comprises tungsten carbide, cobalt base, boron nitride, chromium, a cohesion reducing additive and a solvent, wherein the content of the tungsten carbide is 20-38%, the content of the cobalt base is 5-23%, the content of the boron nitride is 7-15%, the content of the chromium is 12-16%, the content of the cohesion reducing additive is 7-11%, the content of the solvent is 15-25%, the solvent adopts DMF (dimethyl formamide), TOL (toluene diisocyanate), MEK (methyl ethyl ketone), EAC (acrylic acid), IPA (isopropyl alcohol) and water, and the cohesion reducing additive is a low-molecular polymer such as aldehyde ketone resin and low-molecular PE (polyethylene;
the tungsten carbide black hexagonal crystal has metallic luster, the hardness is similar to that of diamond, the tungsten carbide black hexagonal crystal is an electric and thermal good conductor, the cobalt-based alloy is an alloy, the hard alloy can resist various types of abrasion, corrosion and high-temperature oxidation, the cobalt-based alloy takes cobalt as a main component, contains a considerable amount of nickel, chromium and tungsten and a small amount of molybdenum, niobium, tantalum, titanium and lanthanum alloy elements, is introduced with water to reduce the cohesion auxiliary agent and a solvent, has quick solidification property and excellent adhesive force, can effectively control the stability of the PH value through introducing the water to reduce the cohesion auxiliary agent, can slow down the corrosion of the surface of the centrifugal composite roller, and has the characteristics of good mechanical strength, electric insulativity and the like by matching with the high-temperature resistance and the corrosion resistance of tungsten carbide, cobalt-based and chromium metal materials.
In order to better show the production process of the high-temperature-resistant coating on the surface of the centrifugal composite roller, the embodiment now provides a production process of the high-temperature-resistant coating on the surface of the centrifugal composite roller, which comprises the following steps:
the method comprises the following steps: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
step two: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, cooling to form powdery particles, increasing the speed of atomizing airflow through increasing atomizing pressure, damaging the surface and power balance of the atomized airflow, completing secondary atomization, forming metal powder particles with smaller diameter, and sorting the metal powder particles through a turbine classifier to obtain powder with the particle size of 300 meshes;
step three: pouring a solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding a curing agent, wherein the curing agent is low-molecular polyamide, aliphatic diamine or aromatic polyamine, and stirring uniformly to prepare a precursor mixed liquid;
step four: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
step five: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
step six: and uniformly spraying or brushing the turbid liquid on the surface of the centrifugal composite roller, and performing preheating and sintering treatment on the substrate sprayed or brushed with the coating to obtain a layer of high-temperature-resistant coating with uniform thickness and compact structure on the substrate.
Example two:
25-30% of tungsten carbide, 10-17% of cobalt base, 11-13% of boron nitride, 13-15% of chromium, 8-10% of cohesion-reducing additive and 16-20% of solvent.
The method comprises the following steps: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
step two: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, cooling to form powdery particles, increasing the speed of atomizing airflow through increasing atomizing pressure, damaging the surface and power balance of the atomized airflow, completing secondary atomization, forming metal powder particles with smaller diameter, and sorting the metal powder particles through a turbine classifier to obtain powder with the particle size of 300 meshes;
step three: pouring a solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding a curing agent, wherein the curing agent is low-molecular polyamide, aliphatic diamine or aromatic polyamine, and stirring uniformly to prepare a precursor mixed liquid;
step four: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
step five: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
step six: the turbid liquid is evenly sprayed or brushed on the surface of the centrifugal composite roller, and the matrix sprayed or brushed with the coating is preheated and sintered to obtain a layer of high-temperature-resistant coating with even thickness and compact structure on the matrix
Example three:
the content of tungsten carbide is 28%, the cobalt base is 14%, the boron nitride is 12%, the chromium is 14%, the cohesion reducing additive is 9% and the solvent is 18%.
The method comprises the following steps: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
step two: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, cooling to form powdery particles, increasing the speed of atomizing airflow through increasing atomizing pressure, damaging the surface and power balance of the atomized airflow, completing secondary atomization, forming metal powder particles with smaller diameter, and sorting the metal powder particles through a turbine classifier to obtain powder with the particle size of 300 meshes;
step three: pouring a solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding a curing agent, wherein the curing agent is low-molecular polyamide, aliphatic diamine or aromatic polyamine, and stirring uniformly to prepare a precursor mixed liquid;
step four: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
step five: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
step six: the turbid liquid is evenly sprayed or brushed on the surface of the centrifugal composite roller, and the matrix sprayed or brushed with the coating is preheated and sintered to obtain a layer of high-temperature-resistant coating with even thickness and compact structure on the matrix
Comparative example one:
the content of tungsten carbide is 28%, the cobalt base is 8%, the boron nitride is 12%, the chromium is 14%, the cohesion reducing additive is 9% and the solvent is 18%.
The method comprises the following steps: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
step two: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, cooling to form powdery particles, increasing the speed of atomizing airflow through increasing atomizing pressure, damaging the surface and power balance of the atomized airflow, completing secondary atomization, forming metal powder particles with smaller diameter, and sorting the metal powder particles through a turbine classifier to obtain powder with the particle size of 300 meshes;
step three: pouring a solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding a curing agent, wherein the curing agent is low-molecular polyamide, aliphatic diamine or aromatic polyamine, and stirring uniformly to prepare a precursor mixed liquid;
step four: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
step five: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
step six: the turbid liquid is evenly sprayed or brushed on the surface of the centrifugal composite roller, and the matrix sprayed or brushed with the coating is preheated and sintered to obtain a layer of high-temperature-resistant coating with even thickness and compact structure on the matrix
Comparative example two:
the content of tungsten carbide is 28%, the cobalt base is 14%, the boron nitride is 8%, the chromium is 14%, the cohesion reducing additive is 9% and the solvent is 18%.
The method comprises the following steps: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
step two: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, cooling to form powdery particles, increasing the speed of atomizing airflow through increasing atomizing pressure, damaging the surface and power balance of the atomized airflow, completing secondary atomization, forming metal powder particles with smaller diameter, and sorting the metal powder particles through a turbine classifier to obtain powder with the particle size of 300 meshes;
step three: pouring a solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding a curing agent, wherein the curing agent is low-molecular polyamide, aliphatic diamine or aromatic polyamine, and stirring uniformly to prepare a precursor mixed liquid;
step four: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
step five: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
step six: and uniformly spraying or brushing the turbid liquid on the surface of the centrifugal composite roller, and performing preheating and sintering treatment on the substrate sprayed or brushed with the coating to obtain a layer of high-temperature-resistant coating with uniform thickness and compact structure on the substrate.
Examples one, two and three were compared to comparative examples one and two at 400 ℃.
High temperature resistance test
| Degree of deformation | Salt fog resistance | Acetic acid resistance | |
| Practice ofExample one | The axis is offset by 1mm | Foaming | Foaming |
| Example two | Axis offset 0.5mm | Foaming | Foaming |
| EXAMPLE III | Without axis deviation | Does not bubble | Does not bubble |
| Comparative example 1 | Axis offset 0.9mm | Foaming | Foaming |
| Comparative example No. two | Axis offset 1.4mm | Foaming | Foaming |
According to the comparison of the above examples, the content of tungsten carbide is 28%, the cobalt base is 14%, the boron nitride is 12%, the chromium is 14%, the cohesion reducing agent is 9% and the solvent is 18%, which are more stable on the surface in a high temperature environment.
In conclusion, according to the high-temperature-resistant coating on the surface of the centrifugal composite roller and the production process thereof, the prepared tungsten carbide, cobalt-based, boron nitride, chromium and cohesion reducing additive are used as a neutralizing solvent, the water is used for reducing the cohesion auxiliary and the solvent, the coating has quick curing property and excellent adhesive force, the stability of the pH value is effectively controlled through the water is used for reducing the cohesion auxiliary, the corrosion of the surface of the centrifugal composite roller can be relieved, and the high-temperature resistance and the corrosion resistance of the tungsten carbide, cobalt-based and chromium metal materials are matched.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be able to cover the technical solutions and the inventive concepts of the present invention within the technical scope of the present invention.
Claims (8)
1. The surface high-temperature-resistant coating of the centrifugal composite roller is characterized by comprising the following components in percentage by weight: the material comprises 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent.
2. The centrifugal composite roll surface high temperature resistant coating as claimed in claim 1, wherein the content of tungsten carbide is 25-30%, cobalt base is 10-17%, boron nitride is 11-13%, chromium is 13-15%, cohesion reducing additive is 8-10%, and solvent is 16-20%.
3. A centrifugal composite roll surface refractory coating according to claim 1, characterized by a tungsten carbide content of 28%, a cobalt base of 14%, a boron nitride content of 12%, a chromium content of 14%, a cohesion reducing agent of 9% and a solvent content of 18%.
4. A centrifugal composite roll surface refractory coating according to claim 1, wherein the solvent is DMF, TOL, MEK, EAC, IPA, and water.
5. A centrifugal composite roll surface refractory coating according to claim 1, wherein the cohesion reducing additive is a low molecular weight polymer such as an aldehyde ketone resin and a low molecular PE wax.
6. A process for producing a high temperature resistant coating on the surface of a centrifugal composite roll according to claims 1 to 5, comprising the steps of:
s1: accurately weighing each component: weighing 20-38% of tungsten carbide, 5-23% of cobalt base, 7-15% of boron nitride, 12-16% of chromium, 7-11% of cohesion-reducing additive and 15-25% of solvent according to a proportion;
s2: pouring tungsten carbide, cobalt base and chromium into a reaction kettle, raising the temperature to 1300-1350 ℃, liquefying the tungsten carbide, the cobalt base, the boron nitride and the chromium into molten metal at high temperature, assembling the molten metal into a high-pressure atomizing tower, enabling the molten metal to meet inert gas at a nozzle under the action of high pressure, and cooling to form powdery particles;
s3: pouring the solvent into the powdery particles prepared in the step S2, stirring at 1200r/min for 5-10min, mixing uniformly, taking out, continuously adding the curing agent, and stirring uniformly to prepare a precursor mixed liquid;
s4: pouring powdery boron nitride into the precursor mixed solution, stirring at 800r/min for 20-30min, pouring the cohesion reducing additive, adding purified distilled water, heating to 80-85 ℃, and preparing a mixed solution after stirring is finished until bubbles in the liquid disappear;
s5: adding a coupling agent solution into the mixed solution in the S4, mixing in a sealed high-speed stirring container with a constant temperature of 10-12 ℃, stirring at a high speed for 20-30min, observing the solubility of the solution until the solution is transparent and has no turbid matter, storing at a constant temperature, standing for layering, taking out a lower-layer turbid liquid, and removing an upper-layer clarified liquid;
s6: and uniformly spraying or brushing the turbid liquid on the surface of the centrifugal composite roller, and performing preheating and sintering treatment on the substrate sprayed or brushed with the coating to obtain a layer of high-temperature-resistant coating with uniform thickness and compact structure on the substrate.
7. The process for producing a centrifugal composite roller surface refractory coating according to claim 6, wherein in step S2, the atomizing pressure is increased to increase the speed of the atomizing air flow, destroy the surface and dynamic balance thereof, and complete the secondary atomization to form metal powder particles with smaller diameter, and the metal powder particles are sieved by a turbine classifier to obtain powder with a particle size of 300 mesh.
8. The process for producing a centrifugal composite roll surface refractory coating according to claim 6, wherein the curing agent in step S3 is a low molecular polyamide, an aliphatic diamine or an aromatic polyamine.
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