CN111087722A - High-strength wear-resistant composite material for high-speed rail bridge support sliding plate and preparation method thereof - Google Patents
High-strength wear-resistant composite material for high-speed rail bridge support sliding plate and preparation method thereof Download PDFInfo
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Abstract
The invention provides a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate and a preparation method thereof, and relates to the technical field of high-speed rail bridge support sliding plates, wherein the high-strength wear-resistant composite material is prepared from the following raw materials in percentage by weight: 100 parts of polytetrafluoroethylene; 2-5 parts of zinc oxide modified graphene; 0.5-2 parts of fumed silica; 3.5-6 parts of modified basalt glass powder; 0.2-0.5 part of amino silane coupling agent. According to the invention, a proper amount of zinc oxide modified graphene, fumed silica and modified basalt glass powder are added into polytetrafluoroethylene, so that the mechanical property and the wear resistance of the composite material are obviously enhanced, and meanwhile, the use performance of the high-speed rail bridge support sliding plate is greatly improved and the service life is effectively prolonged by combining an optimized preparation process.
Description
Technical Field
The invention relates to the technical field of high-speed rail bridge support sliding plates, in particular to a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate and a preparation method thereof.
Background
With the industrial development and the accelerated pace of life, the construction of railway passenger dedicated lines is more and more, and most of the railway passenger dedicated lines adopt a viaduct mode, so that the use amount of bridge supports is greatly increased. Along with the rapid development of high-speed rails in China, higher requirements are put forward on the reliability of bridge supports, the connection performance of the supports is required to be stable, reliable and durable, and various technical requirement indexes of the supports are far higher than the requirements of the supports in buildings and highways. The manufacturing method of the sliding plate made of the polytetrafluoroethylene through the shock absorption treatment and the performance modification like the manufacturing method of the spherical double-curved surface can achieve the same low friction coefficient as before, and effectively prolongs the service cycle and the service stability. The injection TJQZ-T spherical support is innovatively designed with a specially-made sealing ring, achieves a good packaging effect, and effectively overcomes the defect of overlarge pressure of a structure caused by full load of a train through a structural optimization design when the injection TJQZ-T spherical support is applied to a railway.
The type of the sliding plate applied in the spherical bearing can be divided into an upper sliding plate and a lower sliding plate according to the classification of the using position, and can also be divided into a polytetrafluoroethylene sliding plate, a special rubber sliding plate, an ultra-high molecular weight polyethylene sliding plate and the like according to the material.
The wear-resistant material of the bridge bearing is a sliding component which can not be replaced in the manufacturing process, plays the roles of friction and bearing pressure, and the performance of the sliding plate material directly influences the service life of the bridge bearing. The rubber support is made of synthetic rubber or natural rubber, and the rubber can be aged and hardened after long-term use and is not suitable for a low-temperature area; the wear-resistant materials in the polytetrafluoroethylene plate type support and the basin type support are polytetrafluoroethylene, and the polytetrafluoroethylene is one of fluoroplastics, so that the performance is most beneficial, and the application is most extensive.
Polytetrafluoroethylene, a chemical polymer with excellent comprehensive properties, has a unique spiral molecular structure, presents excellent properties such as high tensile strength, bending strength, compressive strength and impact toughness and a lower friction coefficient, and becomes a common friction material in the current high-speed railway bridge support. However, the mechanical properties and abrasion resistance of the polytetrafluoroethylene sheet still become factors that restrict the development of high-speed iron, because the tensile strength of the polytetrafluoroethylene sheet is greater than or equal to 18 MPa. In recent years, many researchers have changed the mechanical properties and the friction and abrasion resistance of polytetrafluoroethylene boards by filling glass fibers, silica, tin bronze, carbon fibers, graphite, graphene and the like in polytetrafluoroethylene. The research on the carbon fiber filled polytetrafluoroethylene-based composite material in mullite and carbon fiber cooperatively filled polytetrafluoroethylene-based composite material and the tribology performance thereof by Shi nationality army and the like shows that the mechanical property and the wear resistance of the carbon fiber are greatly improved when the carbon fiber is 10 percent. In order to improve the mechanical property and the friction and wear resistance of the polytetrafluoroethylene, the improvement effect of different filling materials on the polytetrafluoroethylene is researched, and a composite material with more excellent performance is obtained, so that the higher and higher requirements of the rapid development of high-speed rails on bridge bearing sliding plates are met.
Disclosure of Invention
The invention aims to provide a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate and a preparation method thereof.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
preferably, the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
preferably, the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
in the invention, the zinc oxide modified graphene is prepared by the following method: dissolving 1 part of zinc acetate in 20 parts of ethylene glycol and violently stirring by using a glass rod to form a solution I; pouring 1.5 parts of graphene into 30 parts of ethylene glycol solution, and carrying out ultrasonic treatment for 2 hours to form a solution II; then pouring the solution I into the solution II, and adjusting the pH value to 9-9.5 by using 1mol/L sodium hydroxide solution; then the obtained solution is placed at the temperature of 150 ℃ and 160 ℃ and stirred for 10-12 h; and then, removing the solvent through reduced pressure concentration, and calcining the obtained product at the temperature of 300-350 ℃ for 1.5-2h under the protection of nitrogen to obtain the zinc oxide modified graphene.
The preparation method of the modified basalt glass powder comprises the following steps: slowly pouring 0.5mol/L glacial acetic acid into the basalt glass powder while stirring to disperse the basalt glass powder in the glacial acetic acid, stopping adding the glacial acetic acid, continuously stirring for 30-50min, repeatedly performing suction filtration and cleaning, and performing vacuum drying at 60-65 ℃ to obtain the modified basalt glass powder.
Preferably, the aminosilane coupling agent is one or more of gamma-aminopropylmethyldimethoxysilane, gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, and N-cyclohexane-gamma-aminopropylmethyldimethoxysilane in combination.
The invention discloses a preparation method of a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate, which comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, filling inert gas, and performing ball-milling mixing; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 15-18MPa/min, the pressure is 150-180MPa, and the pressure maintaining time is 80-110 s;
(3) and (3) placing the sample subjected to cold press molding into a vacuum hot-pressing sintering furnace for sintering, heating to 305-320 ℃ at the heating rate of 1.2-1.8 ℃/min, preserving heat for 30-50min, heating to 355-365 ℃ at the heating rate of 0.5-0.8 ℃/min, preserving heat for 150min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on the product obtained by sintering to obtain the product.
Preferably, in the step (2), zirconia grinding balls are used as the grinding balls, the ball-to-material ratio is 10: 1, the ball-milling time is 3-3.5h, and the rotation speed of the ball mill is 300-.
Preferably, in the step (2), the inert gas is nitrogen or argon, and the pressure of the inert gas is 0.09 MP.
Preferably, in the step (3), the temperature is raised to 310 ℃ at the temperature raising speed of 1.6 ℃/min, the temperature is kept for 45min, and then the temperature is raised to 360 ℃ at the temperature raising speed of 0.6 ℃/min, and the temperature is kept for 145 min.
The invention has the beneficial effects that:
according to the invention, the zinc oxide is adopted to modify the graphene, so that the graphene has better dispersibility, the hardness and the wear resistance of the material can be effectively improved, the mechanical property of the material is greatly improved, and a network structure formed after the graphene is placed in polytetrafluoroethylene can block the fracture and the movement of a polymer molecular chain segment and can slide relative to a matrix, so that the friction coefficient and the wear rate of the support sliding plate are obviously reduced. The surface of the basalt glass powder treated by the glacial acetic acid is provided with a layer of corroded fine concave-convex particles, so that the specific surface area and the surface roughness of the material are effectively increased, the bonding strength of the basalt glass powder and a matrix is enhanced, and the strength and the wear resistance of the composite material can be effectively improved by the basalt glass powder. On the basis, the strength and the weather resistance of the support sliding plate are effectively improved by adding a proper amount of fumed silica. And in the process of preparing the composite material, the aminosilane coupling agent is adopted to modify each reinforcing material, so that the compatibility between each filling material and polytetrafluoroethylene is effectively increased, and a good bridging effect is achieved, so that the performance of the prepared composite material is more excellent.
When the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is prepared, all parameters are reasonably set during cold press molding and sintering, so that the composite material obtained by sintering has high density and all substances have good dispersibility in a base material. The high-speed rail bridge support sliding plate prepared from the high-strength wear-resistant composite material has good mechanical property and wear resistance and excellent weather resistance, so that the use performance is greatly improved, and the service life is effectively prolonged.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but 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.
Example 1:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl methyl dimethoxy silane and gamma-aminopropyl trimethoxy silane which are mixed according to the mass ratio of 1: 1 mixing the components.
The zinc oxide modified graphene is prepared by the following method: dissolving 1 part of zinc acetate in 20 parts of ethylene glycol and violently stirring by using a glass rod to form a solution I; pouring 1.5 parts of graphene into 30 parts of ethylene glycol solution, and carrying out ultrasonic treatment for 2 hours to form a solution II; then pouring the solution I into the solution II, and adjusting the pH value to 9.5 by using 1mol/L sodium hydroxide solution; then placing the obtained solution at 155 ℃ and stirring for 12 h; and then, removing the solvent through reduced pressure concentration, and calcining the obtained product at 340 ℃ for 12 hours under the protection of nitrogen to obtain the zinc oxide modified graphene.
The preparation method of the modified basalt glass powder comprises the following steps: slowly pouring 0.5mol/L glacial acetic acid into the basalt glass powder while stirring to disperse the basalt glass powder in the glacial acetic acid, stopping adding the glacial acetic acid, continuously stirring for 40min, repeatedly performing suction filtration and cleaning, and performing vacuum drying at 65 ℃ to obtain the modified basalt glass powder.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and filling nitrogen under the pressure of 0.09 MP; then ball milling and mixing are carried out, wherein zirconia grinding balls are used as the grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 360 r/min; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 16.5MPa/min, the pressure is 170MPa, and the pressure maintaining time is 100 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 310 ℃ at the heating rate of 1.6 ℃/min, preserving heat for 45min, heating to 360 ℃ at the heating rate of 0.6 ℃/min, preserving heat for 145min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the finished product.
Example 2:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is N-cyclohexane-gamma-aminopropyl methyl dimethoxy silane.
The zinc oxide modified graphene is prepared by the following method: dissolving 1 part of zinc acetate in 20 parts of ethylene glycol and violently stirring by using a glass rod to form a solution I; pouring 1.5 parts of graphene into 30 parts of ethylene glycol solution, and carrying out ultrasonic treatment for 2 hours to form a solution II; then pouring the solution I into the solution II, and adjusting the pH value to 9 by using 1mol/L sodium hydroxide solution; then placing the obtained solution at 150 ℃ and stirring for 10 h; and then, removing the solvent through reduced pressure concentration, and calcining the obtained product at 300 ℃ for 2 hours under the protection of nitrogen to obtain the zinc oxide modified graphene.
The preparation method of the modified basalt glass powder comprises the following steps: slowly pouring 0.5mol/L glacial acetic acid into the basalt glass powder while stirring to disperse the basalt glass powder in the glacial acetic acid, stopping adding the glacial acetic acid, continuously stirring for 50min, repeatedly performing suction filtration and cleaning, and performing vacuum drying at 62 ℃ to obtain the modified basalt glass powder.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and filling nitrogen under the pressure of 0.09 MP; then ball milling and mixing are carried out, wherein zirconia grinding balls are used as the grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 360 r/min; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 15-18MPa/min, the pressure is 150-180MPa, and the pressure maintaining time is 80-110 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 310 ℃ at the heating rate of 1.6 ℃/min, preserving heat for 45min, heating to 360 ℃ at the heating rate of 0.6 ℃/min, preserving heat for 145min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the finished product.
Example 3:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl trimethoxy silane and gamma-aminopropyl triethoxy silane which are mixed according to the mass ratio of 1: 0.5, and mixing.
The zinc oxide modified graphene is prepared by the following method: dissolving 1 part of zinc acetate in 20 parts of ethylene glycol and violently stirring by using a glass rod to form a solution I; pouring 1.5 parts of graphene into 30 parts of ethylene glycol solution, and carrying out ultrasonic treatment for 2 hours to form a solution II; then pouring the solution I into the solution II, and adjusting the pH value to 9.5 by using 1mol/L sodium hydroxide solution; then placing the obtained solution at 160 ℃ and stirring for 12 h; and then, removing the solvent through reduced pressure concentration, and calcining the obtained product at 350 ℃ for 1.5h under the protection of nitrogen to obtain the zinc oxide modified graphene.
The preparation method of the modified basalt glass powder comprises the following steps: slowly pouring 0.5mol/L glacial acetic acid into the basalt glass powder while stirring to disperse the basalt glass powder in the glacial acetic acid, stopping adding the glacial acetic acid, continuously stirring for 30min, repeatedly performing suction filtration and cleaning, and performing vacuum drying at 60 ℃ to obtain the modified basalt glass powder.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and introducing argon gas with the pressure of 0.09 MP; then ball milling and mixing are carried out, wherein zirconia grinding balls are used as the grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 400 r/min; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 18MPa/min, the pressure is 170MPa, and the pressure maintaining time is 90 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 315 ℃ at the heating rate of 1.8 ℃/min, preserving heat for 40min, heating to 365 ℃ at the heating rate of 0.8 ℃/min, preserving heat for 130min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the finished product.
Example 4:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl trimethoxy silane.
The preparation method of the zinc oxide modified graphene and the preparation method of the modified basalt glass powder are the same as in example 2.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and filling nitrogen under the pressure of 0.09 MP; then ball milling and mixing are carried out, wherein zirconia grinding balls are used as the grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 300 r/min; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 15MPa/min, the pressure is 180MPa, and the pressure maintaining time is 80 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 305 ℃ at the heating rate of 1.6 ℃/min, preserving heat for 50min, heating to 355 ℃ at the heating rate of 0.5 ℃/min, preserving heat for 100min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the product.
Example 5:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl methyl dimethoxy silane.
The preparation method of the zinc oxide modified graphene and the preparation method of the modified basalt glass powder are the same as in example 1.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and introducing argon gas with the pressure of 0.09 MP; then ball milling and mixing are carried out, wherein zirconia grinding balls are used as the grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 330 r/min; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 18MPa/min, the pressure is 150MPa, and the pressure maintaining time is 110 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 320 ℃ at the heating rate of 1.2 ℃/min, preserving heat for 30min, heating to 360 ℃ at the heating rate of 0.7 ℃/min, preserving heat for 120min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the product.
Example 6:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl methyl dimethoxy silane, gamma-aminopropyl trimethoxy silane and N-cyclohexane-gamma-aminopropyl methyl dimethoxy silane in the mass ratio of 1: 1: 1 are mixed.
The preparation method of the zinc oxide modified graphene and the preparation method of the modified basalt glass powder are the same as in example 2.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate comprises the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, and filling nitrogen under the pressure of 0.09 MP; then, ball milling, mixing and grinding are carried out, wherein zirconia grinding balls are used as grinding balls, the ball-material ratio is 10: 1, the ball milling time is 3.5h, and the rotating speed of the ball mill is 320 r/min; placing the mixed material in a mould for cold press molding, wherein the pressurizing rate is 16MPa/min, the pressure is 165MPa, and the pressure maintaining time is 95 s;
(3) and placing the cold-pressed and molded sample into a vacuum hot-pressing sintering furnace for sintering, heating to 315 ℃ at the heating rate of 1.5 ℃/min, preserving heat for 40min, heating to 360 ℃ at the heating rate of 0.6 ℃/min, preserving heat for 130min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on a sintered product to obtain the product.
Example 7:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl trimethoxy silane.
The preparation method of the zinc oxide modified graphene and the preparation method of the modified basalt glass powder are the same as in embodiment 3.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is the same as that of the embodiment 1.
Example 8:
a high-strength wear-resistant composite material for a high-speed rail bridge support sliding plate is prepared from the following raw materials in percentage by weight:
the amino silane coupling agent is gamma-aminopropyl methyl dimethoxy silane, gamma-aminopropyl trimethoxy silane and N-cyclohexane-gamma-aminopropyl methyl dimethoxy silane in the mass ratio of 1: 1: 1 are mixed.
The preparation method of the zinc oxide modified graphene and the preparation method of the modified basalt glass powder are the same as in embodiment 1.
The preparation method of the high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is the same as that in example 3.
The high-strength wear-resistant composite material for the high-speed railway bridge support sliding plate in the embodiments 1 to 8 of the invention is subjected to mechanical property test, and the stable friction coefficient (the rotating speed is 150r/min, and the pressure is 100N) of the composite material is measured. Specific performance test results are shown in table 1.
Table 1:
as can be seen from Table 1, the high-strength wear-resistant composite material prepared by the invention has the advantages of excellent mechanical properties, low friction coefficient, good wear resistance, good improvement effect of zinc oxide modified graphene, fumed silica and modified basalt glass powder on polytetrafluoroethylene, and can further meet the requirement of rapid development of high-speed rails on increasingly high requirements of bridge bearing sliding plates.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. The high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate is characterized by being prepared from the following raw materials in percentage by weight:
2. the high-strength wear-resistant composite material for the high-speed railway bridge support saddle sliding plate according to claim 1, which is prepared from the following raw materials in percentage by weight:
3. the high-strength wear-resistant composite material for the high-speed railway bridge support saddle sliding plate according to claim 1, which is prepared from the following raw materials in percentage by weight:
4. the high-strength wear-resistant composite material for the high-speed railway bridge support sliding plate according to claim 1, wherein the zinc oxide modified graphene is prepared by the following method: dissolving 1 part of zinc acetate in 20 parts of ethylene glycol and violently stirring by using a glass rod to form a solution I; pouring 1.5 parts of graphene into 30 parts of ethylene glycol solution, and carrying out ultrasonic treatment for 2 hours to form a solution II; then pouring the solution I into the solution II, and adjusting the pH value to 9-9.5 by using 1mol/L sodium hydroxide solution; then the obtained solution is placed at the temperature of 150 ℃ and 160 ℃ and stirred for 10-12 h; and then, removing the solvent through reduced pressure concentration, and calcining the obtained product at the temperature of 300-350 ℃ for 1.5-2h under the protection of nitrogen to obtain the zinc oxide modified graphene.
5. The high-strength wear-resistant composite material for the high-speed rail bridge support sliding plate according to claim 1, wherein the preparation method of the modified basalt glass powder comprises the following steps: slowly pouring 0.5mol/L glacial acetic acid into the basalt glass powder while stirring to disperse the basalt glass powder in the glacial acetic acid, stopping adding the glacial acetic acid, continuously stirring for 30-50min, repeatedly performing suction filtration and cleaning, and performing vacuum drying at 60-65 ℃ to obtain the modified basalt glass powder.
6. The high-strength wear-resistant composite material for the high-speed railway bridge support sliding plate according to claim 1, wherein the aminosilane coupling agent is one or more of gamma-aminopropylmethyldimethoxysilane, gamma-aminopropyltrimethoxysilane, gamma-aminopropyltriethoxysilane, and N-cyclohexane-gamma-aminopropylmethyldimethoxysilane.
7. The preparation method of the high-strength wear-resistant composite material for the high-speed railway bridge support saddle sliding plate according to any one of claims 1 to 6, which is characterized by comprising the following steps:
(1) uniformly mixing zinc oxide modified graphene, fumed silica, modified basalt glass powder and an aminosilane coupling agent in a high-speed mixer to obtain a premix;
(2) placing the premix and polytetrafluoroethylene in a stainless steel ball-milling tank, vacuumizing the sealed ball-milling tank, filling inert gas, and performing ball-milling mixing; placing the mixed material obtained by ball milling in a mould for cold press molding, wherein the pressurizing rate is 15-18MPa/min, the pressure is 150-180MPa, and the pressure maintaining time is 80-110 s;
(3) and (3) placing the sample subjected to cold press molding into a vacuum hot-pressing sintering furnace for sintering, heating to 305-320 ℃ at the heating rate of 1.2-1.8 ℃/min, preserving heat for 30-50min, heating to 355-365 ℃ at the heating rate of 0.5-0.8 ℃/min, preserving heat for 150min, cooling to room temperature along with the furnace, and performing coarse grinding, fine grinding and polishing on the product obtained by sintering to obtain the product.
8. The method for preparing a high-strength wear-resistant composite material for a sliding plate of a high-speed railway bridge support saddle as claimed in claim 7, wherein in the step (2), zirconia grinding balls are used as the grinding balls, the ball-to-material ratio is 10: 1, the ball-milling time is 3-3.5h, and the rotation speed of the ball mill is 300-.
9. The method for preparing a high-strength wear-resistant composite material for a sliding plate of a bearing of a high-speed railway bridge, according to claim 7, wherein in the step (2), the inert gas is nitrogen or argon, and the pressure of the inert gas is 0.09 MP.
10. The preparation method of the high-strength wear-resistant composite material for the high-speed railway bridge support saddle sliding plate according to claim 7, wherein in the step (3), the temperature is raised to 310 ℃ at a temperature rise rate of 1.6 ℃/min, the temperature is maintained for 45min, and then the temperature is raised to 360 ℃ at a temperature rise rate of 0.6 ℃/min, and the temperature is maintained for 145 min.
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| CN111876052A (en) * | 2020-08-25 | 2020-11-03 | 安徽开林新材料股份有限公司 | High-performance water-based epoxy anticorrosive paint |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN111876052A (en) * | 2020-08-25 | 2020-11-03 | 安徽开林新材料股份有限公司 | High-performance water-based epoxy anticorrosive paint |
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