CN107974164B - Friction coating with light-emitting early warning function and preparation method thereof - Google Patents

Friction coating with light-emitting early warning function and preparation method thereof Download PDF

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CN107974164B
CN107974164B CN201711184554.1A CN201711184554A CN107974164B CN 107974164 B CN107974164 B CN 107974164B CN 201711184554 A CN201711184554 A CN 201711184554A CN 107974164 B CN107974164 B CN 107974164B
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powder
oxide
friction
composite
fluorescent powder
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CN107974164A (en
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吴红艳
张成远
夏於林
鲁小娅
谷卓欣
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Nanjing University of Information Science and Technology
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Nanjing University of Information Science and Technology
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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D163/00—Coating compositions based on epoxy resins; Coating compositions based on derivatives of epoxy resins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/002—Processes for applying liquids or other fluent materials the substrate being rotated
    • B05D1/005—Spin coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/06—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain multicolour or other optical effects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/14—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to metal, e.g. car bodies
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/50—Multilayers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/22—Luminous paints
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2227—Oxides; Hydroxides of metals of aluminium
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
    • C08K3/20—Oxides; Hydroxides
    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2237—Oxides; Hydroxides of metals of titanium
    • C08K2003/2241—Titanium dioxide

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  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Organic Chemistry (AREA)
  • Luminescent Compositions (AREA)

Abstract

The invention relates to a friction coating with a light-emitting early warning function and a preparation method thereof, the invention firstly adopts a ball milling and stirring process to prepare composite friction powder such as oxides, graphene, fluorescent powder with different colors and the like with different proportions, and the light-emitting powder with different colors is mixed into the conventional friction powder; then, the composite powder, the epoxy resin adhesive and the film forming agent are uniformly mixed by utilizing an ultrasonic dispersion technology, so that the composite friction powder can form a good film forming effect on the surface of the metal matrix; and finally, uniformly forming a film on the surface of the substrate by using the spin coating method, wherein the thickness and the quality of the formed film are controllable. The method has the advantages of simple and rapid preparation, low cost, and suitability for large-area production.

Description

Friction coating with light-emitting early warning function and preparation method thereof
Technical Field
The invention relates to the field of mechanical engineering and surface science, in particular to a friction coating with a light-emitting early warning function and a preparation method thereof.
Background
In mechanical equipment, some key parts are in service in a harsh environment, and mutual contact parts can certainly cause damage to the surface of a material under repeated friction, and detection and control of the damaged parts are always the core problems to be solved urgently in the field of tribology. In fact, people usually neglect some originally weak physical and chemical effects induced by the friction environment and show obvious sound, light, electric and magnetic response behaviors along with the occurrence of destructive behaviors such as friction surface plasticity, elasticity and fracture while paying attention to the tribological performance of the material. The early warning behavior in the friction process is mainly realized through sound and light physical signal feedback, wherein the sound signal is a response mode of the mature wear failure in the current research, but the sound signal is easily interfered by other electromechanical noise because the sound signal needs to be in contact with a to-be-tested part, so that the development and the application of the detection method are limited. Compared with an acoustic signal, the feedback of the optical signal not only avoids the contact with the piece to be tested and avoids the influence of noise interference, but also can feed back the change of the surface state (such as composition, structure, deformation and the like) of the material in real time when the monitoring material is worn out and fails. Substances capable of generating luminescence phenomena are mixed into a friction system, and the wear states of different stages in the friction process are judged through luminescence signals.
Disclosure of Invention
The invention aims to provide a friction coating with a light-emitting early warning function and a preparation method thereof, and provides a friction coating system which is uniformly dispersed and prepared by adopting different material formulas of oxide, graphene, fluorescent powder, an adhesive, a film-forming agent and the like and a ball milling process aiming at judging a signal state in a wear failure process in a friction process.
Firstly, preparing composite friction powder such as oxides, graphene, fluorescent powder with different colors and the like in different proportions by adopting a ball milling and stirring process, and mixing the luminous powder with different colors into the conventional friction powder; then, the composite powder, the epoxy resin adhesive and the film forming agent are uniformly mixed by utilizing an ultrasonic dispersion technology, so that the composite friction powder can form a good film forming effect on the surface of the metal matrix; and finally, uniformly forming a film on the surface of the substrate by using the spin coating method, wherein the thickness and the quality of the formed film are controllable.
The specific technical scheme provided by the invention is as follows:
a method for preparing a tribological coating with a luminous warning function, comprising the following steps:
1) preparation of composite friction powder containing different luminophors:
taking fluorescent powder and oxide, adding a proper amount of absolute ethyl alcohol into the fluorescent powder and the oxide, putting the fluorescent powder and the oxide into a ball mill according to a ball-to-material ratio of 300:1-600:1, stirring for 18-24h, and putting the mixture into an ultrasonic dispersion machine for dispersion treatment to obtain uniformly dispersed oxide; adding 0.3% of graphene into the uniformly dispersed oxide, and continuously mixing and stirring the graphene and the oxide in a ball-to-material ratio of 400:1-550:1 in a ball mill for 10-14 hours to obtain oxide, fluorescent powder and graphene composite friction powder;
2) preparation of composite films containing different luminophores:
the composite friction powder and the epoxy resin film forming system are uniformly mixed by utilizing an ultrasonic dispersion technology, so that the composite friction powder can form a good film forming effect on the surface of a metal matrix; and finally, uniformly forming a film on the surface of the substrate by using the mixed material containing the composite friction powder by using a spin coating method, wherein the thickness and the quality of the formed film are controllable.
In the step 1), the mass ratio of the fluorescent powder to the oxide is 1:3-1: 5.
In the step 2), the preparation of the epoxy resin film forming system comprises the following steps: the epoxy resin matrix is prepared by mixing 40-50% of epoxy resin, 10-20% of polyamide resin, 10-20% of benzyl alcohol diluent, 10% of OP-10 dispersant, 5% of coupling agent and a small amount of defoamer.
In the step 2), the oxide, the fluorescent powder and the graphene composite powder are added into an epoxy resin film forming system and are fully stirred.
In the step 2), fluorescent powder film-forming substances doped with different luminescence spectra are respectively spin-coated on the metal substrate, so that the effect of color change layer by layer can be realized.
Further, after each layer is spin-coated, 100 ° baking treatment is required for 2 hours.
Compared with the prior art, the invention has the beneficial effects that:
(1) the invention can realize that the composite films containing the luminophors with different luminescence spectrums are coated on the surfaces of different substrates, and the damage condition of important parts can be monitored through simple optical detection. Simple process, low cost, easy realization of industrialized production and wider market prospect.
(2) The invention has potential application prospect in the aspect of material damage, avoids the contact with a detection piece compared with a mature acoustic signal feedback monitoring mode, simultaneously eliminates the interference of the external environment on the detection, and can realize the real-time accurate feedback of the material damage.
Drawings
FIG. 1: (a) substrate, (b) oxide (Al)2O3) The wear profile of the doped phosphor.
FIG. 2: (a) a substrate, (b) an oxide (TiO)2) The wear profile of the doped phosphor.
FIG. 3: containing Al2O3And a friction curve of the composite film of graphene and phosphor. The friction and wear performance of the composite film is tested by a WTE-2E type controlled atmosphere micro-friction testing machine produced by the Lanzhou chemical research institute of Chinese academy of sciences, a ball-disc friction and wear module is adopted, and silicon nitride with the diameter of 6mm is selected as a counter grinding ball. The set rotation speed of the test is 200r/min, the test time is 30min for each sample, the applied load is 200g, and the samples are all carried out at normal temperature.
FIG. 4: containing TiO2The friction curve of the composite film of graphene and phosphor was measured as above.
FIG. 5: the abrasion phenomenon of the composite film containing green and blue luminophores during abrasion, (a) is the surface fluorescence phenomenon when the composite film is not abraded, (b) is the fluorescence phenomenon in the middle period of abrasion, and (c) is the fluorescence phenomenon in the later period of abrasion. In the invention, a CCD camera is placed on the surface of a sample in a darkroom environment, the abrasion condition of the surface of the material is known by observing the change rule of a luminous signal in the friction process of the composite film, obviously, the luminous signal becomes dark gradually from green on the surface layer along with the friction, the luminous signal presents light blue, and the signal is weaker and weaker along with the increase of the abrasion amount, so that the abrasion degree is stronger and stronger.
FIG. 6: TiO 22The phenomenon of luminescence of the phosphor composite film during rubbing. In the invention, a CCD camera is arranged on the surface of a sample in a darkroom environment, the abrasion condition of the surface of the material is known by observing the change rule of a luminescent signal in the friction process of the composite film, and obviously, the luminescent signal is weaker along with the friction, which indicates that the abrasion degree is stronger and stronger.
Detailed Description
The present invention will be further described with reference to the following specific examples.
Example 1:
(1) phosphor containing double-layer light-emitting effect and alumina (Al)2O3) Preparing composite friction powder:
20g of Al are taken2O3With phosphors having different blue and green emission spectra, the phosphors of different colors are respectively mixed with Al2O3Adding a proper amount of absolute ethyl alcohol into the mixture according to the mass ratio of 1:4, putting the mixture into a ball mill according to the ball-to-material ratio of 500:1, stirring the mixture for 20 hours, and putting the mixture into an ultrasonic dispersion machine for dispersion treatment to obtain uniformly dispersed Al2O3. In the above-mentioned Al2O3Adding 0.3% of graphene, continuously mixing and stirring the graphene and an oxide in a ball-to-material ratio of 500:1 in a ball mill for 12 hours to finally obtain Al2O3Fluorescent powder and graphene composite powder.
(2) Preparing a composite film containing a double-layer luminous effect:
the epoxy resin-based film forming system formula is prepared by using 45% of epoxy resin, 15% of polyamide resin, 15% of benzyl alcohol diluent, 10% of OP-10 dispersing agent, 5% of coupling agent and a small amount of defoaming agent. Then, Al prepared by the method is treated2O3And the composite powder of blue fluorescent powder and graphene is added into the prepared epoxy resin matrix, is fully dispersed and then is spin-coated on a metal (stainless steel) substrate, a first layer of thin film of a luminous body is obtained after the metal (stainless steel) substrate is dried for 2 hours at 100 ℃, and then the same composite powder containing a green fluorescent body is further coated on the surface of the thin film in the same way to obtain a second layer of composite thin film. The wear profile of the composite film and the substrate under a load of 200g is shown in FIG. 1, from which it can be seen that Al doping is performed2O3The appearance of a grinding trace is obviously narrowed and shallowed after the graphene and graphene composite treatment, and the friction coefficient of the graph 3 also shows that the composite treatment has obvious lubricating property, the friction coefficient after the modification is reduced to about 0.35 on average from 0.65, and the friction coefficient is reduced along with the frictionThe friction coefficient is continuously reduced during the process, which shows that the composite system is helpful for improving the friction performance of the metal surface. The invention is characterized in that the change rule of the luminous signal can be obtained along with the change of the abrasion degree in the friction process, the phenomenon is shown in figure 5, and the luminous effect of the friction surface is gradually changed from bright green to blue-green to blue along with the abrasion of the abrasion surface along with the friction.
Example 2:
(1) phosphor containing single green emission effect and titanium oxide (TiO)2) Preparing composite friction powder:
20g of TiO are taken2Adding a proper amount of absolute ethyl alcohol into the mixture, putting the mixture into a ball mill according to the ball-to-material ratio of 500:1, stirring the mixture for 20 hours, then putting the material into an ultrasonic dispersion machine, and opening the suspension to agglomerate so as to obtain uniformly dispersed TiO2And a portion was taken out as a sample. Then adding green phosphor to the rest part to make TiO2The mass ratio of the fluorescent powder to the fluorescent powder is 4:1, the mixture is put into a ball mill according to the ball-to-material ratio of 500:1 and stirred for 12 hours to obtain TiO2A green phosphor and a composite powder of the green phosphor.
(2) Preparation of composite films containing different luminophores:
the epoxy resin-based film forming system formula is prepared by using 45% of epoxy resin, 15% of polyamide resin, 15% of benzyl alcohol diluent, 10% of OP-10 dispersing agent, 5% of coupling agent and a small amount of defoaming agent. Then the TiO prepared by the method is treated2The composite powder of green fluorescent powder and graphene is added into the prepared epoxy resin matrix, is fully dispersed, is spin-coated on a metal (stainless steel) substrate, and is dried for 2 hours at 100 ℃ to obtain a layer of composite film of a luminous body, as shown in figure 5, along with the friction, along with the loss of the worn surface, the luminous effect of the friction surface is changed from bright green to blue slowly. The wear profile of the composite film and substrate under 200g load is shown in FIG. 2, from which it can be seen that the film is TiO doped2The wear scar morphology became significantly shallower after treatment and the coefficient of friction of FIG. 4 also indicates that the composite treatment wasThe modified lubricating oil has obvious lubricating property, the friction coefficient after modification is reduced to about 0.35 on average from 0.65, and the friction coefficient is continuously reduced along with the friction process, which shows that the composite system is beneficial to improving the friction performance of the metal surface. The invention is characterized in that the change rule of the luminous signal can be obtained along with the change of the abrasion degree in the friction process, the phenomenon is shown in figure 6, and the luminous effect of the friction surface is gradually darkened from bright green along with the abrasion of the abrasion surface.
The above description is only a preferred embodiment of the present invention, and should not be taken as limiting the invention in any way, and any person skilled in the art can make any simple modification, equivalent replacement, and improvement on the above embodiment without departing from the technical spirit of the present invention, and still fall within the protection scope of the technical solution of the present invention.

Claims (1)

1. A method for preparing a friction coating with a light-emitting early warning function is characterized by comprising the following steps: the method comprises the following steps:
1) preparation of composite friction powder containing different luminophors:
taking fluorescent powder and oxide, adding a proper amount of absolute ethyl alcohol into the fluorescent powder and the oxide, putting the fluorescent powder and the oxide into a ball mill according to a ball-to-material ratio of 300:1-600:1, stirring for 18-24h, and putting the mixture into an ultrasonic dispersion machine for dispersion treatment to obtain uniformly dispersed oxide; adding 0.3% of graphene into the uniformly dispersed oxide, and continuously mixing and stirring the graphene and the oxide in a ball-to-material ratio of 400:1-550:1 in a ball mill for 10-14 hours to obtain oxide, fluorescent powder and graphene composite friction powder;
2) preparation of composite films containing different luminophores:
the composite friction powder and the epoxy resin film forming system are uniformly mixed by utilizing an ultrasonic dispersion technology, so that the composite friction powder can form a good film forming effect on the surface of a metal matrix; finally, the mixed material containing the composite friction powder is uniformly formed into a film on the surface of the matrix by a spin coating method, and the thickness and the quality of the formed film are controllable;
in the step 1), the mass ratio of the fluorescent powder to the oxide is 1:3-1: 5;
in the step 2), the preparation of the epoxy resin film forming system comprises the following steps: mixing 40-50% of epoxy resin, 10-20% of polyamide resin, 10-20% of benzyl alcohol diluent, 10% of OP-10 dispersant and 5% of coupling agent, and adding a small amount of defoaming agent to prepare an epoxy resin matrix;
in the step 2), adding the oxide, the fluorescent powder and the graphene composite powder into an epoxy resin film forming system, and fully stirring;
in the step 2), fluorescent powder film-forming substances doped with different luminescence spectra are respectively spin-coated on the metal substrate, so that the color change effect layer by layer can be realized;
after each layer was spin coated, 100 ℃ bake treatment was required for 2 hours.
CN201711184554.1A 2017-11-23 2017-11-23 Friction coating with light-emitting early warning function and preparation method thereof Active CN107974164B (en)

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CN115466559A (en) * 2022-09-19 2022-12-13 中国科学院兰州化学物理研究所 Friction luminous paint

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105219219A (en) * 2015-10-19 2016-01-06 国网浙江省电力公司湖州供电公司 A kind of novel wear resistant, protection against corrosion, Antistatic Paint and preparation method thereof
CN107246244A (en) * 2017-07-22 2017-10-13 北京工商大学 It is a kind of can early warning fracture occur alloy coating pumping rod/polish rod and its processing technology

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105219219A (en) * 2015-10-19 2016-01-06 国网浙江省电力公司湖州供电公司 A kind of novel wear resistant, protection against corrosion, Antistatic Paint and preparation method thereof
CN107246244A (en) * 2017-07-22 2017-10-13 北京工商大学 It is a kind of can early warning fracture occur alloy coating pumping rod/polish rod and its processing technology

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