CN110590231B - High-toughness fused corundum wear-resistant coating and preparation method thereof - Google Patents
High-toughness fused corundum wear-resistant coating and preparation method thereof Download PDFInfo
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- CN110590231B CN110590231B CN201910963436.3A CN201910963436A CN110590231B CN 110590231 B CN110590231 B CN 110590231B CN 201910963436 A CN201910963436 A CN 201910963436A CN 110590231 B CN110590231 B CN 110590231B
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B26/00—Compositions of mortars, concrete or artificial stone, containing only organic binders, e.g. polymer or resin concrete
- C04B26/02—Macromolecular compounds
- C04B26/10—Macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds
- C04B26/12—Condensation polymers of aldehydes or ketones
- C04B26/122—Phenol-formaldehyde condensation polymers
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2111/00—Mortars, concrete or artificial stone or mixtures to prepare them, characterised by specific function, property or use
- C04B2111/00474—Uses not provided for elsewhere in C04B2111/00
- C04B2111/00482—Coating or impregnation materials
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- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B2201/00—Mortars, concrete or artificial stone characterised by specific physical values
- C04B2201/50—Mortars, concrete or artificial stone characterised by specific physical values for the mechanical strength
Abstract
The invention discloses a high-toughness fused corundum wear-resistant coating which is prepared from the following raw materials in parts by weight: 30-40 parts of fused corundum,5-8 parts of a binding agent, 0.2-0.3 part of an auxiliary agent, 2-3 parts of activated micro powder, 1.6-2 parts of silicon carbide and 7-10 parts of ethanol; the invention also discloses a preparation method of the wear-resistant coating. The invention takes the electro-fused corundum as the main wear-resistant matrix and takes the modified phenolic resin as the bonding agent of the wear-resistant matrix, thereby not only combining and firmly attaching the wear-resistant matrix to the surface of the matrix, but also forming a compact friction layer on the surface of the matrix; by adding active SiO into the wear-resistant coating2The micro powder reduces the friction force among the fused corundum particles, improves the fluidity of the coating, can fill air holes of the wear-resistant coating, and improves the density of the coating; the compounding of SiC plays an effective role in enhancing and toughening, so that the electro-fused corundum coating with good wear resistance and high toughness is obtained, and is suitable for surface protection of equipment.
Description
Technical Field
The invention belongs to the technical field of coatings, and particularly relates to a high-toughness fused corundum wear-resistant coating and a preparation method thereof.
Background
At present, the service life of a plurality of important parts in a power plant, such as four pipes of a boiler, fan blades, pulverized coal pipeline elbows, last-stage blades of a steam turbine and the like, is greatly shortened due to abrasion, high-temperature corrosion, water erosion and the like, the safe operation of a unit is seriously influenced, and the economic benefit of power production is directly influenced. The domestic method for solving the problems is mainly to replace the damaged parts regularly, and the construction period is long and the investment is large. With the development of new industrial materials, special high-performance materials have become a new hotspot for scientific research of materials. The electro-fused corundum material has extremely high temperature resistance, oxidation resistance and wear resistance, can greatly prolong the service life of equipment by using the electro-fused corundum material as a surface protection material, and has important significance for ensuring the safe and economic use of the equipment.
The Chinese patent with the patent number of CN201310641388.9 discloses a wear-resistant ceramic coating and a preparation method thereof, wherein the wear-resistant ceramic coating comprises the following components in parts by weight: 25-35 parts of quartz, 30-40 parts of fused corundum, 3-8 parts of mullite and 5-10 parts of aluminate cement, uniformly mixing and stirring the components, melting the components at the high temperature of 1500-. In the application, the mechanical property is greatly improved due to the addition of quartz, and the breaking strength and the compressive strength of the quartz exceed those of metal materials, so that the wear resistance of a sample is improved. However, the raw materials of the application are fused together at high temperature only by the high-strength raw materials, so that the application has the defect of low toughness, is easy to generate cracks and cannot play a good protection role.
Disclosure of Invention
The invention aims to provide a high-toughness fused corundum wear-resistant coating and a preparation method thereofThe modified phenolic resin is used as a binding agent of the wear-resistant matrix, so that the wear-resistant matrix can be bound and firmly attached to the surface of the matrix, a compact friction layer can be formed on the surface of the matrix, the wear is reduced, and the stability of the coating in a high-temperature state can be improved and the heat fading is reduced due to the high heat resistance of the modified phenolic resin; by adding active SiO into the wear-resistant coating2The micro powder can be dispersed among the fused corundum particles, reduce the friction among the fused corundum particles, improve the fluidity of the coating, fill pores of the wear-resistant coating, reduce the porosity and improve the density of the coating; the compounding of SiC plays an effective role in enhancing and toughening, so that the electro-fused corundum coating with good wear resistance and high toughness is obtained, and is suitable for surface protection of equipment.
The purpose of the invention can be realized by the following technical scheme:
a high-toughness fused corundum wear-resistant coating is prepared from the following raw materials in parts by weight: 30-40 parts of fused corundum, 5-8 parts of binding agent, 0.2-0.3 part of auxiliary agent, 2-3 parts of activated micro powder, 1.6-2 parts of silicon carbide and 7-10 parts of ethanol;
the binding agent is modified phenolic resin, and the modified phenolic resin is prepared by the following method:
(1) adding hydroxymethylphenol and boric acid into a three-neck flask according to the molar ratio of 2:1, adjusting the pH of the system to 5-6 by adopting oxalic acid, adding a water-carrying agent, heating to 95 ℃, slowly heating to 175 ℃ and reacting for 5 hours;
(2) after the reaction is finished, cooling to 90 ℃, adding melamine and paraformaldehyde until the melamine and the paraformaldehyde are completely dissolved, heating to 110 ℃, and continuing the reaction until gel is generated;
the addition amount of melamine and paraformaldehyde is 25% and 12% of the mass of the hydroxymethyl phenol respectively;
(3) finally, vacuum drying at 120 ℃ until no bubbles are generated, quickly discharging, and naturally cooling to 45 ℃ to obtain modified phenolic resin;
the wear-resistant coating is prepared by the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2-3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2-3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4-5min, finally adding silicon carbide, stirring for 3-5min, uniformly mixing, adding ethanol, and stirring for 2-3min at 600r/min to obtain the wear-resistant coating.
Further, the auxiliary agent is a compound obtained by mixing sodium tripolyphosphate, calcium lignosulphonate and sodium hexametaphosphate according to the mass ratio of 2:1: 1.
Further, the activated micro powder is active SiO2Micropowder, active SiO2The micro powder is prepared by the following method:
1) according to the solid-liquid ratio of 1 g: adding 10mL of silicon dioxide particles into a nitric acid solution with the mass fraction of 15%, stirring and reacting for 150min under the condition of 70 ℃ water bath, filtering, washing a product to be neutral by using distilled water, and drying in a 90 ℃ drying oven for 20h to obtain acidified silicon dioxide particles;
2) according to the solid-liquid ratio of 1 g: adding the acidified silica particles obtained in the step 1) into an ethanol water solution with the mass fraction of 80%, adjusting the pH value of the mixed solution to 4 by using oxalic acid, adding gamma- (methacryloyloxy) propyl trimethoxy silane, and stirring and reacting for 120min under the condition of a water bath at 75 ℃;
3) filtering after the reaction is finished, washing the product to be neutral by using distilled water, and drying for 20 hours in a vacuum drying oven at the temperature of 90 ℃ to obtain active SiO2And (5) micro-powder.
Further, the particle size of the silica particles in step 1) is 1-2 um.
Further, the addition amount of gamma- (methacryloyloxy) propyltrimethoxysilane in the step 2) is 5% of the mass of the silica.
A preparation method of a high-toughness fused corundum wear-resistant coating comprises the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2-3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2-3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4-5min, finally adding silicon carbide, stirring for 3-5min, uniformly mixing, adding ethanol, and stirring for 2-3min at 600r/min to obtain the wear-resistant coating.
The invention has the beneficial effects that:
the modified phenolic resin is used as a binding agent, boron is introduced into a molecular chain of the modified phenolic resin and melamine molecules are grafted, the introduced boron blocks part of easily-oxidized phenolic hydroxyl groups in the hydroxymethyl phenol, and meanwhile, a formed B-O bond (515 kJ/mol) has larger bond energy relative to a C-O bond (326 kJ/mol), so that the heat resistance of the phenolic resin is effectively improved; when the modified phenolic resin is used as a bonding agent, melamine on the molecular chain of the modified phenolic resin has higher reaction activity, namely-NH2The modified phenolic resin can continuously react with other molecules on the surface of the matrix to continuously expand a resin chain and form a compact three-dimensional network structure, so that a compact friction layer can be formed on the surface of the matrix, the friction layer can effectively improve the stability of a friction coefficient and reduce abrasion, and the modified phenolic resin has high heat resistance, so that the stability of the coating in a high-temperature state can be improved and the heat fading can be reduced; the high temperature generated on the surface of the coating during friction can carbonize the modified phenolic resin to form a compact friction layer, so that the stability of the friction factor is improved, and the wear rate of the matrix is reduced;
the invention adds active SiO into the paint2Micropowder, active SiO2During the preparation of the micropowder, on the one hand, the gamma- (methacryloyloxy) propyl trimethoxysilane is stably grafted on the particle surface by chemical bonding, and on the other hand, the gamma- (methacryloyloxy) propyl trimethoxysilane consumes a large amount of SiO2Polar groups on the surface reduce the surface polarity of the particles, so that the active SiO2The compatibility of the micro powder and the bonding agent is increased, and finally the double bond tail chain of the coupling agent can be-NH in the molecular chain of the modified phenolic resin2Reacting to make the silica particles pass through gamma- (methacryloyloxy) propyl trimethoxy silaneForm stable chemical combination with the bonding agent to ensure that the active SiO2The micro powder is uniformly distributed in the coating to play a role; active SiO2The micro powder has small granularity, is easy to be filled into gaps, is filled into a flocculation structure at the same time, occupies the space, has electric charges on the surfaces of micro powder particles due to various reasons in a solvent, and forms slurry together with silicon carbide to be dispersed among the electro-fused corundum particles by the electrostatic repulsion action among the micro powder particles with the same electric charges, thereby reducing the friction among the electro-fused corundum particles and improving the fluidity of the coating; the coating can fill pores of the wear-resistant coating, reduce the porosity and improve the density of the coating;
the wear-resistant coating disclosed by the invention takes the fused corundum as a main wear-resistant matrix, the fused corundum has extremely high-temperature resistance, oxidation resistance and wear resistance, the wear-resistant matrix can be combined and stably attached to the surface of the matrix by taking the modified phenolic resin as a binding agent of the wear-resistant matrix, a compact friction layer can be formed on the surface of the matrix, the wear is reduced, and the high heat resistance of the modified phenolic resin can improve the stability of the coating in a high-temperature state and reduce the heat fading; by adding active SiO into the wear-resistant coating2The micro powder can be dispersed among the fused corundum particles, reduce the friction among the fused corundum particles, improve the fluidity of the coating, fill pores of the wear-resistant coating, reduce the porosity and improve the density of the coating; the compounding of SiC plays an effective role in enhancing and toughening, so that the electro-fused corundum coating with good wear resistance and high toughness is obtained, and is suitable for surface protection of equipment.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood 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.
A high-toughness fused corundum wear-resistant coating is prepared from the following raw materials in parts by weight: 30-40 parts of fused corundum, 5-8 parts of binding agent, 0.2-0.3 part of auxiliary agent, 2-3 parts of activated micro powder, 1.6-2 parts of silicon carbide and 7-10 parts of ethanol;
the auxiliary agent is a compound obtained by mixing sodium tripolyphosphate, calcium lignosulphonate and sodium hexametaphosphate according to the mass ratio of 2:1: 1; the auxiliary agent can wet and lubricate raw material particles, and improves the fluidity and uniformity of the coating;
the binding agent is modified phenolic resin, and the modified phenolic resin is prepared by the following method:
(1) adding hydroxymethylphenol and boric acid into a three-neck flask according to the molar ratio of 2:1, adjusting the pH of a system to 5-6 by adopting oxalic acid, adding a proper amount of water-carrying agent (the added amount is 5% of the mass of the system so as to remove water generated by esterification reaction), heating to 95 ℃, and slowly heating to 175 ℃ for reaction for 5 hours;
(2) after the reaction is finished, cooling to 90 ℃, adding melamine and paraformaldehyde until the melamine and the paraformaldehyde are completely dissolved, heating to 110 ℃, and continuing the reaction until gel is generated;
the addition amount of melamine and paraformaldehyde is 25% and 12% of the mass of the hydroxymethyl phenol respectively;
(3) finally, vacuum drying at 120 ℃ until no bubbles are generated, quickly discharging, and naturally cooling to 45 ℃ to obtain modified phenolic resin;
carrying out dehydration condensation reaction on phenolic hydroxyl on the hydroxymethyl phenol and boric acid to generate arylboronic acid ester; when the arylboronic acid ester reacts with melamine and formaldehyde, on one hand, the arylboronic acid ester (para-hydrogen on an aromatic ring) is subjected to condensation reaction with formaldehyde, and on the other hand, a hydroxymethyl group remains on the aromatic ring of the arylboronic acid ester, and an-OH on the hydroxymethyl group and an-NH of the melamine are remained2Reaction is carried out, melamine is grafted on the molecules of aryl borate, and the molecular chain of the obtained phenolic resin contains B-O bonds and melamine molecular chains; the introduced boron element blocks partial easily-oxidized phenolic hydroxyl groups in the hydroxymethyl phenol, and a formed B-O bond (515 kJ/mol) has larger bond energy relative to a C-O bond (326 kJ/mol), so that the heat resistance of the phenolic resin is effectively improved;
the modified phenolic resin is used as a knotWhen the mixture is used, the melamine on the molecular chain of the modified phenolic resin has higher reaction activity, namely-NH2The modified phenolic resin can continuously react with other molecules on the surface of the matrix to continuously expand a resin chain and form a compact three-dimensional network structure, so that a compact friction layer can be formed on the surface of the matrix, the friction layer can effectively improve the stability of a friction coefficient and reduce abrasion, and the modified phenolic resin has high heat resistance, so that the stability of the coating in a high-temperature state can be improved and the heat fading can be reduced; the high temperature generated on the surface of the coating during friction can carbonize the modified phenolic resin to form a compact friction layer, so that the stability of the friction factor is improved, and the wear rate of the matrix is reduced;
the activated micro powder is active SiO2Micropowder, active SiO2The micro powder is prepared by the following method:
1) according to the solid-liquid ratio of 1 g: adding 10mL of silicon dioxide particles into a nitric acid solution with the mass fraction of 15%, stirring and reacting for 150min under the condition of 70 ℃ water bath, filtering, washing a product to be neutral by using distilled water, and drying in a 90 ℃ drying oven for 20h to obtain acidified silicon dioxide particles;
the particle size of the silicon dioxide particles is 1-2 um;
2) according to the solid-liquid ratio of 1 g: adding the acidified silica particles obtained in the step 1) into an ethanol water solution with the mass fraction of 80%, adjusting the pH value of the mixed solution to 4 by using oxalic acid, adding gamma- (methacryloyloxy) propyl trimethoxy silane (the added amount is 5% of the mass of the silica), and stirring and reacting for 120min under the condition of a water bath at 75 ℃;
3) filtering after the reaction is finished, washing the product to be neutral by using distilled water, and drying for 20 hours in a vacuum drying oven at the temperature of 90 ℃ to obtain active SiO2Micro-powder;
SiO after nitric acid oxidation treatment2The hydroxyl content on the surface of the particles is obviously increased, active sites participating in silane hydrolysis reaction are increased, the hydrolysis reaction can be more effectively carried out with the silane end of the gamma- (methacryloyloxy) propyl trimethoxy silane, and the hydroxyl is condensed with the siloxy in the gamma- (methacryloyloxy) propyl trimethoxy silane, on one hand, the gamma- (methacryloyloxy) propyl tri-aminoMethoxy silane is grafted onto the surface of the particle stably through chemical bonding, and on the other hand, the gamma- (methacryloyloxy) propyl trimethoxy silane consumes SiO greatly2Polar groups on the surface reduce the surface polarity of the particles, so that the active SiO2The compatibility of the micro powder and the bonding agent is increased, and finally the double bond tail chain of the coupling agent can be-NH in the molecular chain of the modified phenolic resin2Reaction is carried out, so that the silicon dioxide particles form stable chemical combination with the bonding agent through the gamma- (methacryloxy) propyl trimethoxy silane, and the active SiO is obtained2The micro powder is uniformly distributed in the coating to play a role;
active SiO2The micro powder has small granularity, is easy to be filled into gaps, is filled into a flocculation structure at the same time, occupies the space, has electric charges on the surfaces of micro powder particles due to various reasons in a solvent, and forms slurry together with silicon carbide to be dispersed among the electro-fused corundum particles by the electrostatic repulsion action among the micro powder particles with the same electric charges, thereby reducing the friction among the electro-fused corundum particles and improving the fluidity of the coating; the coating can fill pores of the wear-resistant coating, reduce the porosity and improve the density of the coating;
the grain size of the silicon carbide is 60-80um, SiC is added into the coating, gaps or partial gaps surrounding the silicon carbide ions can be generated around the SiC ions, great benefits are provided for improving the thermal shock resistance stability and strength of the material, the material is subjected to mechanical stress and thermal stress to enable the coating to generate cracks, when the cracks are expanded to the SiC particles, the stress at the tips of the cracks can be released and reduced around the gaps, the energy for promoting the crack expansion is absorbed, the cracks are prevented from being continuously expanded, and therefore the effects of toughening and strengthening are achieved; if the tip of the crack encounters a part of the combination of the SiC particles and the coating matrix instead of surrounding the gap, the crack can also deflect, bend or slip due to the difference between the elastic modulus, strength and thermal expansion coefficient between the SiC particles and the matrix, and the toughening and reinforcing effects are exerted on the material; meanwhile, the coating is smeared on the surface of the matrix, and SiC particles are oxidized at high temperature to generate O-Si-O bonds in the process of generating heat by friction of the coating or heating the matrix, so that the effects of strengthening and toughening are achieved;
the preparation method of the wear-resistant coating comprises the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2-3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2-3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4-5min, finally adding silicon carbide, stirring for 3-5min, uniformly mixing, adding ethanol, and stirring for 2-3min at 600r/min to obtain the wear-resistant coating.
Example 1
A high-toughness fused corundum wear-resistant coating is prepared from the following raw materials in parts by weight: 30 parts of fused corundum, 5 parts of binding agent, 0.2 part of auxiliary agent, 2 parts of activated micro powder, 1.6 parts of silicon carbide and 7 parts of ethanol;
the wear-resistant coating is prepared by the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4min, finally adding silicon carbide, stirring for 3-5min, adding ethanol after uniformly mixing, and stirring for 2min at 600r/min to obtain the wear-resistant coating.
Example 2
A high-toughness fused corundum wear-resistant coating is prepared from the following raw materials in parts by weight: 35 parts of fused corundum, 6.5 parts of bonding agent, 0.25 part of auxiliary agent, 2.5 parts of activated micro powder, 1.8 parts of silicon carbide and 8.5 parts of ethanol;
the wear-resistant coating is prepared by the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2.5min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2.5min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4.5min, finally adding silicon carbide, stirring for 4min, adding ethanol after uniformly mixing, and stirring for 2.5min at 600r/min to obtain the wear-resistant coating.
Example 3
A high-toughness fused corundum wear-resistant coating is prepared from the following raw materials in parts by weight: 40 parts of fused corundum, 8 parts of bonding agent, 0.3 part of auxiliary agent, 3 parts of activated micro powder, 2 parts of silicon carbide and 10 parts of ethanol;
the wear-resistant coating is prepared by the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 5min, finally adding silicon carbide, stirring for 5min, uniformly mixing, adding ethanol, and stirring for 3min at 600r/min to obtain the wear-resistant coating.
Comparative example 1
The raw material binder in example 1 was changed to a conventional phenol resin, and the rest of the preparation process was unchanged.
Comparative example 2
The activated fine powder in example 1 was changed to ordinary SiO2The particle and the rest preparation process are unchanged.
Comparative example 3
The raw material silicon carbide in example 1 was removed and the rest of the preparation process was unchanged.
The coatings obtained in examples 1 to 3 and comparative examples 1 to 3 were formed into test pieces of 20cm × 5cm × 5cm by vibration molding, and then dried at 100 ℃ for 24 hours for the following performance tests:
hardness was measured according to GB/T5766-2007; testing the flexural strength and the compressive strength according to GB/T3001-; testing impact toughness by adopting a simply supported beam type pendulum impact testing machine; according to the regulations of GB 5763-:
it can be seen that the abrasion resistant coatings prepared in examples 1-3 have Rockwell hardness of 62.1-62.5, breaking strength of 22.3-22.9MPa, and compressive strength of 128-129MPa, which are compared with comparative examples 2 and 3, and illustrate that the nano SiO2The addition of the micro powder and the SiC can effectively increase the mechanical strength of the coating; the impact toughness of the coating samples obtained in examples 1 to 3 was 4.36 to 4.49 kJ. cm-2Compared with comparative example 3, the addition of the silicon carbide has the effect of enhancing and toughening the coating; the coating samples prepared in examples 1-3 had little fluctuation (0.34-0.36) in friction factor and little fluctuation (0.13-0.14 x 10) in wear rate when the temperature was increased to 100 ℃ and 300 ℃-7/cm3/(N · m)), as compared with comparative example 1, it is demonstrated that the modified phenolic resin can form a dense friction layer on the surface of the substrate, effectively improve the stability of the friction coefficient, reduce the wear, and have temperature resistance.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. The high-toughness fused corundum wear-resistant coating is characterized by being prepared from the following raw materials in parts by weight: 30-40 parts of fused corundum, 5-8 parts of binding agent, 0.2-0.3 part of auxiliary agent, 2-3 parts of activated micro powder, 1.6-2 parts of silicon carbide and 7-10 parts of ethanol;
the binding agent is modified phenolic resin, and the modified phenolic resin is prepared by the following method:
(1) adding hydroxymethylphenol and boric acid into a three-neck flask according to the molar ratio of 2:1, adjusting the pH of the system to 5-6 by adopting oxalic acid, adding a water-carrying agent, heating to 95 ℃, slowly heating to 175 ℃ and reacting for 5 hours;
(2) after the reaction is finished, cooling to 90 ℃, adding melamine and paraformaldehyde until the melamine and the paraformaldehyde are completely dissolved, heating to 110 ℃, and continuing the reaction until gel is generated;
the addition amount of melamine and paraformaldehyde is 25% and 12% of the mass of the hydroxymethyl phenol respectively;
finally, vacuum drying at 120 ℃ until no bubbles are generated, quickly discharging, and naturally cooling to 45 ℃ to obtain modified phenolic resin;
the activated micro powder is active SiO2Micropowder, active SiO2The micro powder is prepared by the following method:
1) according to the solid-liquid ratio of 1 g: adding 10mL of silicon dioxide particles into a nitric acid solution with the mass fraction of 15%, stirring and reacting for 150min under the condition of 70 ℃ water bath, filtering, washing a product to be neutral by using distilled water, and drying in a 90 ℃ drying oven for 20h to obtain acidified silicon dioxide particles;
2) according to the solid-liquid ratio of 1 g: adding the acidified silica particles obtained in the step 1) into an ethanol water solution with the mass fraction of 80%, adjusting the pH value of the mixed solution to 4 by using oxalic acid, adding gamma- (methacryloyloxy) propyl trimethoxy silane, and stirring and reacting for 120min under the condition of a water bath at 75 ℃;
3) filtering after the reaction is finished, washing the product to be neutral by using distilled water, and drying for 20 hours in a vacuum drying oven at the temperature of 90 ℃ to obtain active SiO2Micro-powder;
the wear-resistant coating is prepared by the following steps:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2-3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2-3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4-5min, finally adding silicon carbide, stirring for 3-5min, uniformly mixing, adding ethanol, and stirring for 2-3min at 600r/min to obtain the wear-resistant coating.
2. The high-toughness fused corundum wear-resistant coating as claimed in claim 1, wherein the auxiliary agent is a compound obtained by mixing sodium tripolyphosphate, calcium lignosulfonate and sodium hexametaphosphate in a mass ratio of 2:1: 1.
3. A high toughness fused corundum abrasive coating according to claim 1, characterized in that, the grain size of the silicon dioxide grain in step 1) is 1-2 um.
4. A high toughness electro-fused corundum abrasive resistant coating according to claim 1, characterized in that the amount of gamma- (methacryloyloxy) propyl trimethoxy silane added in step 2) is 5% of the mass of silicon dioxide.
5. The preparation method of the high-toughness fused corundum wear-resistant coating according to claim 1, characterized by comprising the following steps of:
step S1, adding the fused corundum into a stirrer according to the parts by weight, and stirring for 2-3min at a speed of 300 r/min;
step S2, adding the weighed binding agent into the stirrer, and continuing stirring for 2-3min at 300 r/min;
and step S3, adding the auxiliary agent and the activated micro powder into a stirrer, increasing the stirring speed to 500r/min, stirring for 4-5min, finally adding silicon carbide, stirring for 3-5min, uniformly mixing, adding ethanol, and stirring for 2-3min at 600r/min to obtain the wear-resistant coating.
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