CN111019344A - Ultrasonic motor rotor friction material and preparation method thereof - Google Patents
Ultrasonic motor rotor friction material and preparation method thereof Download PDFInfo
- Publication number
- CN111019344A CN111019344A CN201911191445.1A CN201911191445A CN111019344A CN 111019344 A CN111019344 A CN 111019344A CN 201911191445 A CN201911191445 A CN 201911191445A CN 111019344 A CN111019344 A CN 111019344A
- Authority
- CN
- China
- Prior art keywords
- ultrasonic motor
- polyimide
- parts
- oxide
- motor rotor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Images
Classifications
-
- 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
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/041—Carbon nanotubes
-
- 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
- C08K3/02—Elements
- C08K3/04—Carbon
- C08K3/042—Graphene or derivatives, e.g. graphene oxides
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K3/00—Materials not provided for elsewhere
- C09K3/14—Anti-slip materials; Abrasives
-
- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
-
- 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
- C08K2003/221—Oxides; Hydroxides of metals of rare earth metal
- C08K2003/2213—Oxides; Hydroxides of metals of rare earth metal of cerium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Nanotechnology (AREA)
- General Electrical Machinery Utilizing Piezoelectricity, Electrostriction Or Magnetostriction (AREA)
Abstract
The invention discloses an ultrasonic motor rotor friction material and a preparation method of an ultrasonic motor rotor based on the friction material, wherein the material is a polymer matrix composite material and is composed of the following raw materials in parts by weight: 100 parts of polyimide, 1-5 parts of rare earth oxide, 1-5 parts of graphene oxide and 1-5 parts of multi-walled carbon nano tube. The composite material disclosed by the invention has the advantages of light weight, stable friction coefficient, ultralow wear rate, simple preparation method, convenience in operation, low cost and easiness in industrial mass preparation, and the composite material is easy to process into a rotor to be used in a rotary ultrasonic motor, so that the weight of the ultrasonic motor can be reduced, and the service life of the ultrasonic motor can be prolonged.
Description
Technical Field
The invention belongs to the field of ultrasonic motors, and particularly relates to an ultrasonic motor rotor friction material and a method for preparing an ultrasonic motor rotor by using the material.
Background
The current rotary ultrasonic motor faces the severe problem of too short service life, because the ultrasonic motor transfers energy by a friction interface, a friction layer is continuously worn under a dry friction condition, and the service life is shorter particularly under a severe working condition, which greatly limits the development and application of the ultrasonic motor.
The traditional ultrasonic motor service life solving method is to stick a wear-resistant material layer on the surface of an aluminum alloy rotor, wherein the thickness is about 200-300 microns, the use requirement of the motor cannot be met when the wear-resistant material layer is too thick, but the service life of the ultrasonic motor is shortened when the wear-resistant material layer is too thin, a large amount of work is concentrated on improving the wear resistance of the friction material in order to solve the service life of the ultrasonic motor, but the lifting space is limited, and the service life of the ultrasonic motor is still difficult to greatly improve under severe working conditions.
The polytetrafluoroethylene-based composite material has the defects of low mechanical strength, small hardness, short service life and the like, is difficult to meet the requirements of high output stability and ultra-long service life of the ultrasonic motor under large pre-pressure, and is not suitable to be used as a replacement material of the ultrasonic motor rotor. Therefore, the development of new friction materials is crucial to the rapid development of ultrasonic motors.
Disclosure of Invention
The invention aims to provide an ultrasonic motor rotor friction material and a preparation method thereof, aiming at the problem that the service life of the friction material for an ultrasonic motor is short.
In order to achieve the purpose, the invention adopts the technical scheme that:
the ultrasonic motor rotor friction material is a polymer-based composite material and comprises the following raw materials in parts by weight: 100 parts of polyimide, 1-5 parts of rare earth oxide, 1-5 parts of graphene oxide and 1-5 parts of multi-walled carbon nano tube.
Preferably, the polyimide is micron-sized molding powder, and the average particle size is 75 microns. It has the priority of stable performance and is very suitable for inorganic particle filling and mould pressing.
Preferably, the diameter of the multi-walled carbon nanotube is 8-15nm, and the length of the multi-walled carbon nanotube is 10-50 μm. The multi-wall carbon nano tube has good mechanical property and can improve the strength of the polymer.
Preferably, the size of the graphene oxide is 1-5 μm, and the thickness of the graphene oxide is 0.8-1.2 nm. Strong hydrogen bonds exist between the graphene oxide surface active functional groups and polyimide molecules, so that the interface binding force can be improved, and the wear resistance of the polyimide is greatly improved; in addition, compared with graphene, the graphene oxide has good dispersibility in ethanol, avoids the agglomeration phenomenon, and improves the dispersibility of the graphene oxide in polyimide.
Preferably, the rare earth oxide is one of lanthanum oxide, samarium oxide, cerium oxide and other rare earth oxides, and the particle size of the rare earth oxide is 50-200 nm. The rare earth oxide can be well dispersed in ethanol, and can improve the surface performance and the wear resistance of the composite material with the cooperation of the graphene oxide and the carbon nano tube.
Based on the friction material provided by the invention, another object of the invention is to provide a method for preparing an ultrasonic motor rotor, which integrates the friction material and the rotor, and adopts the technical scheme that:
a preparation method of an ultrasonic motor rotor comprises the following steps:
(1) uniformly dispersing graphene oxide, multi-walled carbon nanotubes and rare earth oxide in absolute ethyl alcohol, performing ultrasonic dispersion and mechanical stirring for 2-6 hours, then adding polyimide, continuously dispersing for 1-2 hours, fully mixing uniformly, and then performing drying, crushing and sieving treatment to obtain a molding material;
(2) pouring the mold material obtained in the step (1) into a mold for hot-pressing sintering molding, and then naturally cooling and demolding to obtain a polyimide nano composite material;
(3) and (3) processing the polyimide nano composite material prepared in the step (2) into a rotor for an ultrasonic motor, polishing the surface of the rotor, and supplying power to the motor.
Preferably, in the step (1), the mesh number in the sieving treatment is 200 meshes.
Preferably, in the step (2), the conditions for hot-press sintering molding are as follows: the mould pressing temperature is 360-380 ℃, and the pressure is 10-20 MPa.
Preferably, in the step (3), the surface roughness is polished to 0.1 μm.
An ultrasonic motor rotor prepared by the method.
Has the advantages that: compared with the prior art, the invention has the advantages that:
(1) the invention avoids the problems that the traditional friction material has the defects of glue opening and falling off on the surface of the aluminum alloy and short service life. The rotor and the friction material are integrally designed, and the rotor has the advantages of light weight and long service life.
(2) The invention selects polyimide with very good comprehensive performance as a substrate, and compared with the traditional polytetrafluoroethylene, the mechanical strength, the surface hardness, the temperature resistance and the wear resistance of the composite material are greatly improved; although the friction coefficient of polyimide is larger than that of polytetrafluoroethylene, the high friction coefficient is beneficial to improving the output torque and the motion conversion efficiency of the ultrasonic motor, so that the selection of polyimide as a substrate is the key for improving the mechanical output performance of the ultrasonic motor.
(3) According to the invention, rare earth oxide with low cost and obvious modification effect is selected for modification, and comparison of the modification effects of several rare earth oxides shows that the lanthanum oxide has the best antifriction effect, and the lanthanum oxide is beneficial to reducing the friction and wear of polyimide because the lanthanum oxide is easy to absorb carbon dioxide and water in the air to perform chemical reaction; in addition, the carbon nano tube and the graphene oxide with excellent performance are selected to carry out synergistic modification on the polyimide, so that the mechanical performance of the polyimide can be greatly improved, the wear rate of the polyimide is reduced, the service life of the ultrasonic motor is prolonged, and a material guarantee is provided for the ultrasonic motor in the aerospace field for a super-long service time.
(4) The composite material has lower density, can effectively reduce the weight of the ultrasonic motor, has higher mechanical property, stable friction coefficient and extremely low wear rate, and can greatly improve the bearing capacity, the running stability and the service life of the ultrasonic motor.
(5) The invention has the advantages of convenient manufacture, one-time processing and forming, no need of complex processes such as surface treatment and friction layer pasting, no need of high-precision equipment such as glue layer curing process and the like for guarantee, and low cost.
Drawings
FIG. 1 is a comparison of a prior art ultrasonic motor rotor structure and an ultrasonic motor rotor structure of the present invention;
FIG. 2 is a graph showing the change in wear rate in various embodiments of the present invention.
Detailed Description
The invention is further explained below with reference to the drawings.
As shown in fig. 1, which is a comparison between the rotor structure of the ultrasonic motor in the prior art and the rotor structure of the ultrasonic motor of the present invention, the present invention integrally designs a friction material on a rotor, and the friction material of the rotor of the ultrasonic motor is a polymer-based composite material, and is composed of the following raw materials in parts by weight: 100 parts of polyimide, 1-5 parts of rare earth oxide, 1-5 parts of graphene oxide and 1-5 parts of multi-walled carbon nano tube. Wherein the polyimide is micron-sized mould pressing powder, and the average grain diameter is 75 mu m; the diameter of the multi-walled carbon nanotube is 8-15nm, and the length of the multi-walled carbon nanotube is 10-50 mu m; the size of the graphene oxide is 1-5 mu m, and the thickness of the graphene oxide is 0.8-1.2 nm; the rare earth oxide is one of lanthanum oxide, samarium oxide, cerium oxide and other rare earth oxides, and the particle size of the rare earth oxide is 50-200 nm.
Based on the friction material, the ultrasonic motor rotor is prepared by the following method:
(1) uniformly dispersing graphene oxide, multi-walled carbon nanotubes and rare earth oxide in absolute ethyl alcohol, performing ultrasonic dispersion and mechanical stirring for 2-6 hours, then adding polyimide, continuously dispersing for 1-2 hours, fully mixing uniformly, and then performing drying, crushing and sieving treatment to obtain a molding material;
(2) pouring the mold material obtained in the step (1) into a mold for hot-pressing sintering molding, and then naturally cooling and demolding to obtain a polyimide nano composite material; wherein, the conditions of hot-pressing sintering molding are as follows: the mould pressing temperature is 360-380 ℃, and the pressure is 10-20 MPa;
(3) and (3) processing the polyimide nano composite material prepared in the step (2) into a rotor for an ultrasonic motor, polishing the surface roughness to 0.1 micron, and using the rotor for the ultrasonic motor.
Compared with the prior art, firstly, the invention selects the polyimide of plastic king as the polymer matrix, and the polyimide is a high polymer material with good insulating property, high temperature resistance, corrosion resistance, wear resistance and strong bearing capacity, but the pure polyimide has high wear loss rate in a high-frequency micro-vibration environment and is difficult to meet the use requirement of the ultrasonic motor under complex working conditions. Therefore, modification of polyimide is the most effective method for improving mechanical and tribological properties. According to the invention, on the basis of carbon nanotube enhancement, the polyimide is synergistically modified by using the rare earth oxide and the graphene oxide, so that the wear resistance and the operation stability of the polyimide nano composite material can be greatly improved. And secondly, according to different addition proportions of the nano modifier, the preparation method is optimized so as to prepare the high-performance rotor integrated friction material suitable for the ultrasonic motor.
The present invention will be further described with reference to the following examples.
The polyimide selected in the following examples had an average particle size of 75 μm and was obtained from Shanghai institute of synthetic resins; lanthanum oxide (particle size 50nm), samarium oxide (particle size 40nm) and cerium oxide (particle size 100nm) rare earth oxides were purchased from Shanghai Allantin Biotechnology, Inc.; the graphene oxide is high-purity reagent-grade graphene oxide powder, the purity is more than 99%, the size is 1-5 mu m, the thickness is 0.8-1.2nm, and the graphene oxide is purchased from Nanjing Jicang nanometer technology Co., Ltd; the multi-wall carbon nano-tube has the diameter of 8-15nm and the length of 10-50 mu m, and is purchased from Chengdu organic chemistry GmbH of Chinese academy of sciences.
Example 1
A polyimide nano composite material synergistically modified by rare earth oxide and graphene oxide comprises the following components in parts by weight: 100 parts of polyimide, 1 part of lanthanum oxide, 1 part of multi-walled carbon nanotube and 1 part of graphene oxide.
The friction material of the embodiment is used for preparing the rotor of the ultrasonic motor, and the steps are as follows:
1. uniformly dispersing graphene oxide, a multi-walled carbon nanotube and a rare earth oxide in absolute ethyl alcohol, performing ultrasonic dispersion and mechanical stirring for 2 hours, adding polyimide, continuously dispersing for 1 hour, fully and uniformly mixing, and then drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 360 ℃, the pressure is 10MPa, the heat preservation time is 60 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is subjected to matched friction with a phosphor bronze stator for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.31 and the average wear rate is about 6.23 multiplied by 10 after three times of tests-8mm3/N·m。
Example 2
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 1 part of cerium oxide, 1 part of multi-walled carbon nanotube and 1 part of graphene oxide.
The friction material of the embodiment is used for preparing the rotor of the ultrasonic motor, and the steps are as follows:
1. firstly, uniformly dispersing graphene oxide, a multi-walled carbon nanotube and rare earth oxide in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 2 hours, then adding polyimide molding powder, continuously dispersing for 1 hour, fully and uniformly mixing, and then drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 360 ℃, the pressure is 10MPa, the heat preservation time is 60 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is matched with a phosphor bronze stator for friction for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.42 after three tests, and the average wear rate is about 11.2 multiplied by 10-8mm3/N·m。
Example 3
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 1 part of samarium oxide, 1 part of multi-walled carbon nanotube and 1 part of graphene oxide.
The preparation method comprises the following specific steps:
1. firstly, uniformly dispersing graphene oxide, a multi-walled carbon nanotube and rare earth oxide in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 2 hours, then adding polyimide molding powder, continuously dispersing for 1 hour, fully and uniformly mixing, and then drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 360 ℃, the pressure is 10MPa, the heat preservation time is 60 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is matched with a phosphor bronze stator for friction for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.35 after three tests, and the average wear rate is about 27.5 multiplied by 10-8mm3/N·m。
The comparison of the three examples shows that the wear-reducing and wear-resisting effects of lanthanum oxide are most obvious, so that the subsequent examples optimize the modification effect of lanthanum oxide with higher proportion, and the examples of the material design and the preparation method are as follows:
example 4.
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 2 parts of lanthanum oxide, 2 parts of multi-wall carbon nano tube and 2 parts of graphene oxide.
The friction material of the embodiment is used for preparing the rotor of the ultrasonic motor, and the steps are as follows:
1. firstly, uniformly dispersing graphene oxide, a multi-walled carbon nanotube and rare earth oxide in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 3 hours, then adding polyimide molding powder, continuously dispersing for 1 hour, fully mixing uniformly, drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 365 ℃, the pressure is 10MPa, the heat preservation time is 65 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is matched with a phosphor bronze stator for friction for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.295 when the composite material is tested for three times, and the average wear rate is about 5.38 multiplied by 10-8mm3/N·m。
Example 5
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 3 parts of lanthanum oxide, 3 parts of multi-wall carbon nano tube and 3 parts of graphene oxide.
The preparation method comprises the following specific steps:
1. firstly, uniformly dispersing graphene oxide, a multi-walled carbon nanotube and rare earth oxide in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 4 hours, then adding polyimide molding powder, continuously dispersing for 1.5 hours, fully and uniformly mixing, drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 370 ℃, the pressure is 15MPa, the heat preservation time is 70 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared in the embodiment is subjected to matched friction with a phosphor bronze stator for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.283 after three tests, and the average wear rate is about 4.19 multiplied by 10-8mm3/N·m。
Example 6
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 4 parts of lanthanum oxide, 4 parts of multi-wall carbon nano tube and 4 parts of graphene oxide.
The preparation method comprises the following specific steps:
1. firstly, uniformly dispersing graphene oxide, a multi-walled carbon nanotube and rare earth oxide in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 5 hours, then adding polyimide molding powder, continuously dispersing for 1.5 hours, fully and uniformly mixing, drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 375 ℃, the pressure is 15MPa, the heat preservation time is 80 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is matched with a phosphor bronze stator for friction for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.276 and the average wear rate is about 3.86 multiplied by 10 after three times of tests-8mm3/N·m。
Example 7
The rare earth oxide and graphene oxide synergistically modified polyimide nanocomposite comprises the following components in parts by weight: 100 parts of polyimide, 5 parts of lanthanum oxide, 5 parts of multi-wall carbon nano tube and 5 parts of graphene oxide.
The friction material of the embodiment is used for preparing the rotor of the ultrasonic motor, and the steps are as follows:
1. firstly, uniformly dispersing graphene oxide, carbon nano tubes and rare earth oxides in absolute ethyl alcohol, carrying out ultrasonic dispersion and mechanical stirring for 6 hours, then adding polyimide molding powder, continuously dispersing for 2 hours, fully and uniformly mixing, and then drying, crushing and sieving with a 200-mesh sieve to obtain a molding material;
2. adding the mixed mould material into a mould for hot-pressing sintering molding, wherein the mould pressing temperature is 380 ℃, the pressure is 20MPa, the heat preservation time is 90 minutes, and then naturally cooling and demoulding are carried out to obtain the polyimide nano composite material;
3. the prepared polyimide nano composite material is processed into an ultrasonic motor rotor, the surface roughness is polished to 0.1 micron, and the ultrasonic motor rotor is assembled to a motor for use.
The polyimide nano composite material prepared by the embodiment is matched with a phosphor bronze stator for friction for 2 hours under the conditions of 100N and 200r/min, the average friction coefficient is 0.272 and the average wear rate is about 2.75 multiplied by 10 after three times of tests-8mm3/N·m。
FIG. 2 is a graph showing the change in wear rate of the polyimide nanocomposite prepared in example. Numbers 1 to 7 in the figure correspond to the wear rates of the polyimide nanocomposites obtained in examples 1 to 7, respectively. As can be seen from fig. 2, compared with samarium oxide and cerium oxide, the lanthanum oxide modified polyimide nanocomposite has a lower wear rate and a longest service life, but the wear rate gradually decreases with the increase of the content.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (10)
1. An ultrasonic motor rotor friction material is characterized in that: the material is a polymer-based composite material and comprises the following raw materials in parts by weight: 100 parts of polyimide, 1-5 parts of rare earth oxide, 1-5 parts of graphene oxide and 1-5 parts of multi-walled carbon nano tube.
2. The ultrasonic motor rotor friction material of claim 1, wherein: the polyimide is micron-sized mould pressing powder, and the average grain diameter is 75 micrometers.
3. The ultrasonic motor rotor friction material of claim 1, wherein: the diameter of the multi-walled carbon nanotube is 8-15nm, and the length of the multi-walled carbon nanotube is 10-50 mu m.
4. The ultrasonic motor rotor friction material of claim 1, wherein: the graphene oxide is 1-5 mu m in size and 0.8-1.2nm in thickness.
5. The ultrasonic motor rotor friction material of claim 1, wherein: the rare earth oxide is one of lanthanum oxide, samarium oxide, cerium oxide and other rare earth oxides, and the particle size of the rare earth oxide is 50-200 nm.
6. A method for preparing an ultrasonic motor rotor based on the friction material of claim 1 is characterized in that: the method comprises the following steps:
(1) uniformly dispersing graphene oxide, multi-walled carbon nanotubes and rare earth oxide in absolute ethyl alcohol, performing ultrasonic dispersion and mechanical stirring for 2-6 hours, then adding polyimide, continuously dispersing for 1-2 hours, fully mixing uniformly, and then performing drying, crushing and sieving treatment to obtain a molding material;
(2) pouring the mold material obtained in the step (1) into a mold for hot-pressing sintering molding, and then naturally cooling and demolding to obtain a polyimide nano composite material;
(3) and (3) processing the polyimide nano composite material prepared in the step (2) into a rotor for an ultrasonic motor, polishing the surface of the rotor, and supplying power to the motor.
7. The method of claim 6, wherein: in the step (1), the mesh number during sieving treatment is 200 meshes.
8. The method of claim 6, wherein: in the step (2), the conditions of hot-pressing sintering molding are as follows: the mould pressing temperature is 360-380 ℃, and the pressure is 10-20 MPa.
9. The method of claim 6, wherein: in the step (3), the surface roughness is polished to 0.1 μm.
10. An ultrasonic motor rotor made by the method of claim 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191445.1A CN111019344A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic motor rotor friction material and preparation method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911191445.1A CN111019344A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic motor rotor friction material and preparation method thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111019344A true CN111019344A (en) | 2020-04-17 |
Family
ID=70203135
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911191445.1A Pending CN111019344A (en) | 2019-11-28 | 2019-11-28 | Ultrasonic motor rotor friction material and preparation method thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111019344A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402881A (en) * | 2021-05-25 | 2021-09-17 | 南京航空航天大学 | High-thermal-conductivity polyimide friction material and preparation method thereof |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2561162Y (en) * | 2002-06-30 | 2003-07-16 | 华中科技大学 | Supersonic electric motor |
| US20090108414A1 (en) * | 2007-10-26 | 2009-04-30 | Shin-Etsu Chemical Co., Ltd. | Wafer |
| JP2013246881A (en) * | 2012-05-23 | 2013-12-09 | Chubu Electric Power Co Inc | Insulation coating structure of superconducting wire rod |
| CN103911118A (en) * | 2014-04-01 | 2014-07-09 | 南京航空航天大学 | Polyimide friction material for rotary ultrasonic motor and preparation method of polyimide friction material |
| CN104893288A (en) * | 2015-04-30 | 2015-09-09 | 南京航空航天大学 | Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof |
| CN105419225A (en) * | 2015-11-24 | 2016-03-23 | 南京航空航天大学 | Polyether-ether-ketone composite material for ultrasonic motor and preparing method thereof |
| CN105722375A (en) * | 2016-01-29 | 2016-06-29 | 白德旭 | Graphene radiating apparatus and preparation method therefor |
| CN107086814A (en) * | 2017-05-23 | 2017-08-22 | 南京航空航天大学 | The textured design method of ultrasound electric machine surface of friction pair |
| CN109867956A (en) * | 2019-02-25 | 2019-06-11 | 南京航空航天大学 | A kind of polyimide nano-composite material, application and the preparation method of rare earth and graphene oxide modified synergic |
-
2019
- 2019-11-28 CN CN201911191445.1A patent/CN111019344A/en active Pending
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2561162Y (en) * | 2002-06-30 | 2003-07-16 | 华中科技大学 | Supersonic electric motor |
| US20090108414A1 (en) * | 2007-10-26 | 2009-04-30 | Shin-Etsu Chemical Co., Ltd. | Wafer |
| JP2013246881A (en) * | 2012-05-23 | 2013-12-09 | Chubu Electric Power Co Inc | Insulation coating structure of superconducting wire rod |
| CN103911118A (en) * | 2014-04-01 | 2014-07-09 | 南京航空航天大学 | Polyimide friction material for rotary ultrasonic motor and preparation method of polyimide friction material |
| CN104893288A (en) * | 2015-04-30 | 2015-09-09 | 南京航空航天大学 | Porous oil-containing polyimide composite material for ultrasonic motor and preparation method thereof |
| CN105419225A (en) * | 2015-11-24 | 2016-03-23 | 南京航空航天大学 | Polyether-ether-ketone composite material for ultrasonic motor and preparing method thereof |
| CN105722375A (en) * | 2016-01-29 | 2016-06-29 | 白德旭 | Graphene radiating apparatus and preparation method therefor |
| CN107086814A (en) * | 2017-05-23 | 2017-08-22 | 南京航空航天大学 | The textured design method of ultrasound electric machine surface of friction pair |
| CN109867956A (en) * | 2019-02-25 | 2019-06-11 | 南京航空航天大学 | A kind of polyimide nano-composite material, application and the preparation method of rare earth and graphene oxide modified synergic |
Non-Patent Citations (3)
| Title |
|---|
| CHUNYING MIN等: ""Unique synergistic effects of graphene oxide and carbon nanotube hybrids on the tribological properties of polyimide nanocomposites"", 《TRIBOLOGY INTERNATIONAL》 * |
| ZHIHE PAN等: ""Effects of rare earth oxide additive on surface and tribological properties of polyimide composites"", 《APPLIED SURFACE SCIENCE》 * |
| 陈涛等: ""稀土化合物对PTFE基三层复合材料摩擦磨损性能的影响"", 《润滑与密封》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113402881A (en) * | 2021-05-25 | 2021-09-17 | 南京航空航天大学 | High-thermal-conductivity polyimide friction material and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN110105695B (en) | High-wear-resistance polytetrafluoroethylene composite material and preparation method thereof | |
| CN108517435B (en) | Nano-carbon reinforced copper-based composite material for maglev train and preparation method thereof | |
| CN109338167B (en) | Preparation method of carbon nano tube composite material | |
| CN106636992B (en) | A kind of CNTs and CNFs collaborations enhancing Cu-base composites and preparation method | |
| CN105419225A (en) | Polyether-ether-ketone composite material for ultrasonic motor and preparing method thereof | |
| CN105968662B (en) | Ultrasound electric machine carbon micron tube filled polymer oil-containing friction material and preparation method thereof | |
| CN109867956B (en) | Rare earth and graphene oxide synergistically modified polyimide nanocomposite, application and preparation method | |
| CN108795041B (en) | Nano MoS2Carbon nano tube/bismaleimide resin composite material and preparation method thereof | |
| CN111333982B (en) | Polytetrafluoroethylene friction material and preparation method and application thereof | |
| CN111022535A (en) | Modified polyimide friction material for wind power yaw brake and preparation method thereof | |
| CN108048684A (en) | A kind of preparation method of MWCNTs Reinforced Cus-Ti composite materials | |
| CN108359198B (en) | Friction material for piezoelectric motor and preparation method and application thereof | |
| CN111019344A (en) | Ultrasonic motor rotor friction material and preparation method thereof | |
| CN110437586B (en) | Preparation method of high-dispersion graphene reinforced epoxy resin matrix composite material | |
| CN101651281A (en) | Graphite brush and preparation method thereof | |
| CN110129607B (en) | Authigenic titanium carbide reinforced copper-based composite material and preparation method thereof | |
| CN112062979B (en) | Organic-inorganic core-shell structure self-lubricating composite material and preparation method thereof | |
| CN102924763B (en) | Preparation method of high-modulus low-heat carbon nano tube/ rubber composite material | |
| CN105861872A (en) | Carbon nanotube reinforced copper-based composite material and preparation method thereof | |
| CN111270171B (en) | Nano-carbon reinforced Mo-Cu-Zr composite material and preparation method thereof | |
| JP7328712B2 (en) | Ultrafine carbon powder and its production method and application | |
| CN109679344A (en) | A kind of ultrasound electric machine multidimensional modified synergic composite polyimide material and preparation method thereof | |
| CN110129606B (en) | Preparation method of directionally arranged carbon nanotube reinforced aluminum-based composite wire | |
| CN113402881A (en) | High-thermal-conductivity polyimide friction material and preparation method thereof | |
| CN109880365B (en) | Black phosphorus modified polyimide composite material and preparation method and application thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200417 |
|
| RJ01 | Rejection of invention patent application after publication |