CN111763091A - High-thermal-shock wear-resistant coating and preparation method thereof - Google Patents
High-thermal-shock wear-resistant coating and preparation method thereof Download PDFInfo
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Abstract
The invention discloses a high thermal shock wear-resistant coating which is prepared from main materials and auxiliary materials in a mass ratio of 92-96: 8-4 mixing; the main material comprises the following components in percentage by mass: 25-40% of zirconium dioxide, 35-45% of a binding agent, 10-15% of aluminum silicate powder, 10-15% of aluminum oxide, 2-4% of aluminum powder and 1-3% of sodium tripolyphosphate; the auxiliary materials comprise the following components in percentage by mass: 98-99% of nano powder and 2-1% of graphene; the nano powder consists of nano zirconia and nano aluminum oxide according to a mass ratio of 1: 1. According to the invention, the graphene modified nano powder is adopted, and is redispersed under the action of strong shearing force and attached to the surfaces of other coarse particles, so that micro cracks are generated in the product and a net structure is formed, and due to the existence of the micro cracks, the energy of crack propagation is absorbed, so that the product has a remarkable effect on resisting the catastrophic damage of the product, and the thermal shock stability of the product is enhanced.
Description
Technical Field
The invention relates to the technical field of wear-resistant coatings, in particular to a high thermal shock wear-resistant coating and a preparation method thereof.
Background
The circulating fluidized bed boiler technology is the currently accepted clean coal combustion technology, and because the circulating fluidized bed power generation boiler has a complex construction system, large construction quantity, high pulverized coal flow speed in a system pipeline and large flow, the circulating fluidized bed power generation boiler has excellent performance required for refractory materials. However, the refractory materials commonly used in the circulating fluidized bed boiler at present adopt high-alumina clinker or white corundum raw materials, the cement content is high, the wear resistance, the erosion resistance, the scouring resistance and the thermal shock stability of the refractory materials can not meet the technical requirements of the circulating fluidized bed boiler, the service cycle is short, frequent repair or replacement is needed, the normal operation of the circulating fluidized bed boiler is influenced, and a large amount of manpower and financial resources are consumed.
The inventor previously applied Chinese patent 200810243011.7 discloses a high-temperature wear-resistant coating, the compressive strength of which is obviously improved after high-temperature baking compared with that of a high-aluminum wear-resistant sintered material or a white corundum wear-resistant sintered material, but the requirement on the thermal shock stability of the coating is higher due to uneven temperature of a circulating fluidized bed in working and non-working time, the coating still has the problems of cracking, peeling and even collapse of the coating when the coating is subjected to rapid change of environmental temperature, and the prior art cannot meet the requirement on the thermal shock stability of rapid change of the environmental temperature and needs to be improved.
Disclosure of Invention
The invention aims to overcome the defects of the technology and provides the high thermal shock wear-resistant coating and the preparation method thereof, the thermal shock stability is good, the service life is longer, and the coating is more suitable for circulating fluidized bed boilers of thermal power plants.
In order to achieve the purpose, the invention adopts the technical scheme that: the high thermal shock wear-resistant coating is characterized by comprising main materials and auxiliary materials in a mass ratio of 92-96: 8-4 mixing;
the main material comprises the following components in percentage by mass: 25-40% of zirconium dioxide, 35-45% of a binding agent, 10-15% of aluminum silicate powder, 10-15% of aluminum oxide, 2-4% of aluminum powder and 1-3% of sodium tripolyphosphate;
the auxiliary materials comprise the following components in percentage by mass: 98-99% of nano powder and 2-1% of graphene;
the nano powder is prepared from nano zirconium oxide and nano aluminum oxide according to a mass ratio of 1: 1.
Further, the binding agent is aluminum dihydrogen phosphate.
Further, the particle size of the aluminum silicate powder is 1250 meshes.
Further, the particle size of the aluminum powder is less than 75 μm.
The preparation method of the high thermal shock wear-resistant coating as defined in claim 1, which comprises the following steps:
s1, metering the raw materials in the main material according to the mass ratio, mixing, putting into a ball mill for dry ball milling to obtain the main material, and barreling by using a plastic barrel;
s2, weighing the raw materials in the auxiliary materials according to the mass ratio, mixing, putting into a ball mill for wet ball milling, drying to obtain the auxiliary materials, and bagging;
and S3, mixing the main material and the auxiliary material before construction, adding water, and fully stirring to obtain the coating.
Further, the ball milling medium for wet ball milling described in S2 is demineralized water.
The invention has the beneficial effects that: by adopting the technical scheme, the high-thermal shock resistant and wear resistant coating has the advantages that the zirconium dioxide with high temperature resistance of more than 2000 ℃ is used as the main raw material, so that the high-thermal shock resistant and wear resistant coating has high compression strength, high hardness, high density, excellent wear resistance, erosion resistance, scouring resistance, thermal shock stability and high adhesion; the graphene modified nano powder is re-dispersed under the action of strong shearing force and attached to the surfaces of other coarse particles, so that micro cracks are generated in the product and a net structure is formed, and due to the existence of the micro cracks, the crack propagation energy is absorbed, so that the product has a remarkable effect on resisting catastrophic damage (thermal spalling or fracture) of the product, and the thermal shock stability of the product is enhanced.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below.
Example 1
A high thermal shock wear-resistant coating is prepared from main materials and auxiliary materials in a mass ratio of 92: 8, mixing the components; the main material comprises the following components in percentage by mass: 25% of zirconium dioxide, 45% of a binding agent, 10% of aluminum silicate powder, 15% of aluminum oxide, 2% of aluminum powder and 3% of sodium tripolyphosphate; the auxiliary materials comprise the following components in percentage by mass: 98% of nano powder and 2% of graphene; wherein the nanometer powder consists of nanometer zirconia and nanometer aluminum oxide according to the mass ratio of 1: 1.
The bonding agent is aluminum dihydrogen phosphate; the grain size of the aluminum silicate powder is 1250 meshes; the grain diameter of the aluminum powder is less than 75 mu m.
The preparation method of the high thermal shock wear-resistant coating comprises the following steps:
s1, metering the raw materials in the main material according to the mass ratio, mixing, putting into a ball mill for dry ball milling to obtain the main material, and barreling by using a plastic barrel;
s2, weighing the raw materials in the auxiliary materials according to the mass ratio, mixing, putting into a ball mill for wet ball milling, drying to obtain the auxiliary materials, and bagging;
and S3, mixing the main material and the auxiliary material before construction, adding water, and fully stirring to obtain the coating.
Wherein, the ball milling medium of the wet ball milling in the S2 is softened water.
Example 2
A high thermal shock wear-resistant coating is prepared from main materials and auxiliary materials in a mass ratio of 95: 5, mixing the components; the main material comprises the following components in percentage by mass: 30% of zirconium dioxide, 40% of a binding agent, 15% of aluminum silicate powder, 10% of aluminum oxide, 3% of aluminum powder and 2% of sodium tripolyphosphate; the auxiliary materials comprise the following components in percentage by mass: 98.5% of nano powder and 1.5% of graphene; wherein the nanometer powder consists of nanometer zirconia and nanometer aluminum oxide according to the mass ratio of 1: 1.
The bonding agent is aluminum dihydrogen phosphate; the grain size of the aluminum silicate powder is 1250 meshes; the grain diameter of the aluminum powder is less than 75 mu m.
The preparation method of the high thermal shock wear-resistant coating comprises the following steps:
s1, metering the raw materials in the main material according to the mass ratio, mixing, putting into a ball mill for dry ball milling to obtain the main material, and barreling by using a plastic barrel;
s2, weighing the raw materials in the auxiliary materials according to the mass ratio, mixing, putting into a ball mill for wet ball milling, drying to obtain the auxiliary materials, and bagging;
and S3, mixing the main material and the auxiliary material before construction, adding water, and fully stirring to obtain the coating.
Wherein, the ball milling medium of the wet ball milling in the S2 is softened water.
Example 3
A high thermal shock wear-resistant coating is prepared from main materials and auxiliary materials in a mass ratio of 96: 4, mixing; the main material comprises the following components in percentage by mass: 40% of zirconium dioxide, 35% of a binding agent, 10% of aluminum silicate powder, 10% of aluminum oxide, 4% of aluminum powder and 1% of sodium tripolyphosphate; the auxiliary materials comprise the following components in percentage by mass: 99% of nano powder and 1% of graphene; wherein the nanometer powder consists of nanometer zirconia and nanometer aluminum oxide according to the mass ratio of 1: 1.
The bonding agent is aluminum dihydrogen phosphate; the grain size of the aluminum silicate powder is 1250 meshes; the grain diameter of the aluminum powder is less than 75 mu m.
The preparation method of the high thermal shock wear-resistant coating comprises the following steps:
s1, metering the raw materials in the main material according to the mass ratio, mixing, putting into a ball mill for dry ball milling to obtain the main material, and barreling by using a plastic barrel;
s2, weighing the raw materials in the auxiliary materials according to the mass ratio, mixing, putting into a ball mill for wet ball milling, drying to obtain the auxiliary materials, and bagging;
and S3, mixing the main material and the auxiliary material before construction, adding water, and fully stirring to obtain the coating.
Wherein, the ball milling medium of the wet ball milling in the S2 is softened water.
The described embodiments are only some embodiments of the invention, not all 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.
Claims (6)
1. The high thermal shock wear-resistant coating is characterized by comprising main materials and auxiliary materials in a mass ratio of 92-96: 8-4 mixing;
the main material comprises the following components in percentage by mass: 25-40% of zirconium dioxide, 35-45% of a binding agent, 10-15% of aluminum silicate powder, 10-15% of aluminum oxide, 2-4% of aluminum powder and 1-3% of sodium tripolyphosphate;
the auxiliary materials comprise the following components in percentage by mass: 98-99% of nano powder and 2-1% of graphene;
the nano powder is prepared from nano zirconium oxide and nano aluminum oxide according to a mass ratio of 1: 1.
2. A high thermal shock abrasion resistant coating as claimed in claim 1, wherein said binder is aluminum dihydrogen phosphate.
3. The high thermal shock wear-resistant coating as claimed in claim 1, wherein the particle size of the aluminum silicate is 1250 mesh.
4. A high thermal shock wear resistant coating according to claim 1 wherein said aluminum powder has a particle size of less than 75 μm.
5. The preparation method of the high thermal shock wear-resistant coating as defined in claim 1, which comprises the following steps:
s1, metering the raw materials in the main material according to the mass ratio, mixing, putting into a ball mill for dry ball milling to obtain the main material, and barreling by using a plastic barrel;
s2, weighing the raw materials in the auxiliary materials according to the mass ratio, mixing, putting into a ball mill for wet ball milling, drying to obtain the auxiliary materials, and bagging;
and S3, mixing the main material and the auxiliary material before construction, adding water, and fully stirring to obtain the coating.
6. The method for preparing high thermal shock wear-resistant coating according to claim 5, wherein the ball milling medium of the wet ball milling in S2 is softened water.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115141497A (en) * | 2022-09-01 | 2022-10-04 | 宜兴市国强炉业有限公司 | High-thermal-conductivity wear-resistant material for circulating fluidized bed boiler and preparation method thereof |
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