CN116874957B - Zirconia frame reinforced polytetrafluoroethylene bionic composite material and preparation method thereof - Google Patents
Zirconia frame reinforced polytetrafluoroethylene bionic composite material and preparation method thereof Download PDFInfo
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- MCMNRKCIXSYSNV-UHFFFAOYSA-N Zirconium dioxide Chemical compound O=[Zr]=O MCMNRKCIXSYSNV-UHFFFAOYSA-N 0.000 title claims abstract description 123
- 239000004810 polytetrafluoroethylene Substances 0.000 title claims abstract description 75
- 229920001343 polytetrafluoroethylene Polymers 0.000 title claims abstract description 75
- -1 polytetrafluoroethylene Polymers 0.000 title claims abstract description 73
- 239000002131 composite material Substances 0.000 title claims abstract description 47
- 239000011664 nicotinic acid Substances 0.000 title claims abstract description 41
- 238000002360 preparation method Methods 0.000 title claims abstract description 16
- 239000000919 ceramic Substances 0.000 claims abstract description 49
- 238000005245 sintering Methods 0.000 claims abstract description 14
- 239000000945 filler Substances 0.000 claims abstract description 12
- 238000007710 freezing Methods 0.000 claims abstract description 9
- 230000008014 freezing Effects 0.000 claims abstract description 9
- DUFCMRCMPHIFTR-UHFFFAOYSA-N 5-(dimethylsulfamoyl)-2-methylfuran-3-carboxylic acid Chemical compound CN(C)S(=O)(=O)C1=CC(C(O)=O)=C(C)O1 DUFCMRCMPHIFTR-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 17
- 239000002245 particle Substances 0.000 claims description 12
- 239000002002 slurry Substances 0.000 claims description 12
- 239000004372 Polyvinyl alcohol Substances 0.000 claims description 9
- 239000006185 dispersion Substances 0.000 claims description 9
- 229920001495 poly(sodium acrylate) polymer Polymers 0.000 claims description 9
- 229920002451 polyvinyl alcohol Polymers 0.000 claims description 9
- 239000000843 powder Substances 0.000 claims description 9
- NNMHYFLPFNGQFZ-UHFFFAOYSA-M sodium polyacrylate Chemical compound [Na+].[O-]C(=O)C=C NNMHYFLPFNGQFZ-UHFFFAOYSA-M 0.000 claims description 9
- 238000001816 cooling Methods 0.000 claims description 8
- 238000010438 heat treatment Methods 0.000 claims description 8
- 239000004721 Polyphenylene oxide Substances 0.000 claims description 5
- 238000000498 ball milling Methods 0.000 claims description 5
- 235000015895 biscuits Nutrition 0.000 claims description 5
- RKTYLMNFRDHKIL-UHFFFAOYSA-N copper;5,10,15,20-tetraphenylporphyrin-22,24-diide Chemical compound [Cu+2].C1=CC(C(=C2C=CC([N-]2)=C(C=2C=CC=CC=2)C=2C=CC(N=2)=C(C=2C=CC=CC=2)C2=CC=C3[N-]2)C=2C=CC=CC=2)=NC1=C3C1=CC=CC=C1 RKTYLMNFRDHKIL-UHFFFAOYSA-N 0.000 claims description 5
- 239000013530 defoamer Substances 0.000 claims description 5
- 238000001035 drying Methods 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 5
- GALOTNBSUVEISR-UHFFFAOYSA-N molybdenum;silicon Chemical compound [Mo]#[Si] GALOTNBSUVEISR-UHFFFAOYSA-N 0.000 claims description 5
- 229920000570 polyether Polymers 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 4
- GWEVSGVZZGPLCZ-UHFFFAOYSA-N Titan oxide Chemical compound O=[Ti]=O GWEVSGVZZGPLCZ-UHFFFAOYSA-N 0.000 claims description 4
- RVTZCBVAJQQJTK-UHFFFAOYSA-N oxygen(2-);zirconium(4+) Chemical compound [O-2].[O-2].[Zr+4] RVTZCBVAJQQJTK-UHFFFAOYSA-N 0.000 claims description 4
- 238000002791 soaking Methods 0.000 claims description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Chemical compound O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 4
- 239000013078 crystal Substances 0.000 claims description 3
- 239000008367 deionised water Substances 0.000 claims description 3
- 229910021641 deionized water Inorganic materials 0.000 claims description 3
- 238000009777 vacuum freeze-drying Methods 0.000 claims description 3
- 238000005303 weighing Methods 0.000 claims description 3
- CETPSERCERDGAM-UHFFFAOYSA-N ceric oxide Chemical compound O=[Ce]=O CETPSERCERDGAM-UHFFFAOYSA-N 0.000 claims description 2
- 229910000422 cerium(IV) oxide Inorganic materials 0.000 claims description 2
- 238000002156 mixing Methods 0.000 claims description 2
- 239000002105 nanoparticle Substances 0.000 claims description 2
- TWNQGVIAIRXVLR-UHFFFAOYSA-N oxo(oxoalumanyloxy)alumane Chemical compound O=[Al]O[Al]=O TWNQGVIAIRXVLR-UHFFFAOYSA-N 0.000 claims description 2
- 235000012239 silicon dioxide Nutrition 0.000 claims description 2
- 239000000377 silicon dioxide Substances 0.000 claims description 2
- 239000004408 titanium dioxide Substances 0.000 claims description 2
- SIWVEOZUMHYXCS-UHFFFAOYSA-N oxo(oxoyttriooxy)yttrium Chemical compound O=[Y]O[Y]=O SIWVEOZUMHYXCS-UHFFFAOYSA-N 0.000 claims 1
- 239000000463 material Substances 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000012360 testing method Methods 0.000 description 11
- 238000005461 lubrication Methods 0.000 description 10
- 239000004744 fabric Substances 0.000 description 8
- 239000000835 fiber Substances 0.000 description 5
- 239000007787 solid Substances 0.000 description 4
- 238000005299 abrasion Methods 0.000 description 3
- 230000003592 biomimetic effect Effects 0.000 description 3
- 238000012546 transfer Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 231100000252 nontoxic Toxicity 0.000 description 2
- 230000003000 nontoxic effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 229910000906 Bronze Inorganic materials 0.000 description 1
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 229920000049 Carbon (fiber) Polymers 0.000 description 1
- 239000004380 Cholic acid Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000004760 aramid Substances 0.000 description 1
- 229920006231 aramid fiber Polymers 0.000 description 1
- 239000010974 bronze Substances 0.000 description 1
- 239000004917 carbon fiber Substances 0.000 description 1
- 238000012669 compression test Methods 0.000 description 1
- KUNSUQLRTQLHQQ-UHFFFAOYSA-N copper tin Chemical compound [Cu].[Sn] KUNSUQLRTQLHQQ-UHFFFAOYSA-N 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000003365 glass fiber Substances 0.000 description 1
- 229910002804 graphite Inorganic materials 0.000 description 1
- 239000010439 graphite Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000007542 hardness measurement Methods 0.000 description 1
- 238000005470 impregnation Methods 0.000 description 1
- 238000011031 large-scale manufacturing process Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229910052574 oxide ceramic Inorganic materials 0.000 description 1
- 239000011224 oxide ceramic Substances 0.000 description 1
- 238000011056 performance test Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000009877 rendering Methods 0.000 description 1
- 238000006748 scratching Methods 0.000 description 1
- 230000002393 scratching effect Effects 0.000 description 1
- 239000011343 solid material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229910001928 zirconium oxide Inorganic materials 0.000 description 1
Classifications
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- 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
- C08K7/00—Use of ingredients characterised by shape
- C08K7/22—Expanded, porous or hollow particles
- C08K7/24—Expanded, porous or hollow particles inorganic
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Materials For Medical Uses (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
本发明公开了一种氧化锆框架增强聚四氟乙烯仿生复合材料及制备方法，氧化锆框架增强聚四氟乙烯仿生复合材料由有序多孔氧化锆陶瓷框架和聚四氟乙烯填料构成，制备步骤主要包括一种乙酸锆改进的定向冷冻技术制备有序多孔氧化锆陶瓷框架和聚四氟乙烯浸渍烧结。本发明仿生复合材料利用具有高承载能力的有序多孔氧化锆陶瓷框架和具有自润滑功能的聚四氟乙烯填料构成的仿生微结构，在保证材料优异自润滑性能的同时，实现材料承载能力和耐磨性大幅提升。
The invention discloses a zirconia frame reinforced polytetrafluoroethylene bionic composite material and a preparation method thereof. The zirconia frame reinforced polytetrafluoroethylene bionic composite material is composed of an ordered porous zirconia ceramic frame and a polytetrafluoroethylene filler, and the preparation steps mainly include preparing the ordered porous zirconia ceramic frame by using an improved directional freezing technology of zirconium acetate and impregnating and sintering the polytetrafluoroethylene. The bionic composite material of the invention utilizes a bionic microstructure composed of an ordered porous zirconia ceramic frame with high load-bearing capacity and a polytetrafluoroethylene filler with a self-lubricating function, and while ensuring the excellent self-lubricating performance of the material, the material load-bearing capacity and wear resistance are greatly improved.
Description
Technical Field
The invention belongs to the field of self-lubricating wear-resistant materials, and particularly relates to a zirconia framework reinforced polytetrafluoroethylene bionic composite material and a preparation method thereof.
Background
Lubrication is a main means for realizing antifriction and grinding reduction of the surfaces of mechanical parts, and has great significance for ensuring the safe operation of equipment, prolonging the service life of the parts and realizing material and energy conservation. Compared with the traditional lubrication technology (liquid lubrication and semi-solid lubrication), the solid self-lubrication has the advantages of high bearing capacity, strong working condition adaptability (especially high temperature, high speed, heavy load, vacuum and other extreme working conditions), and the like, and is beneficial to simplifying the structural design of equipment and reducing the manufacturing cost of the equipment, so that the solid self-lubrication is widely applied to the high-tech fields such as aerospace, ships and warships, biomedical engineering, precise electronic equipment and the like.
The core of the solid self-lubricating technology is the design and preparation of high-performance self-lubricating materials. Polytetrafluoroethylene is one of the solid materials with the lowest friction coefficient at present, has excellent self-lubricating performance, can rapidly form a self-lubricating transfer film at a contact interface in the friction process, and reduces the friction force of the contact interface. However, polytetrafluoroethylene has poor mechanical properties and poor wear resistance, is easy to cause mechanical friction damage, and is difficult to directly apply to engineering practice.
At present, the solution means for poor wear resistance of polytetrafluoroethylene mainly focuses on two aspects of adding reinforcing body particles or continuous fiber fabrics into a polytetrafluoroethylene matrix. In the aspect of adding reinforcing body particles, inorganic rigid fillers such as bronze, graphite, oxide ceramic particles, glass fibers, carbon fibers and the like are mainly added into a polytetrafluoroethylene matrix to improve the overall rigidity and hardness of the material and achieve the purpose of reducing the surface abrasion of the material, and in the aspect of adding continuous fiber fabrics, polytetrafluoroethylene is mainly filled into fiber fabrics such as aramid fibers or glass fabrics, and the carrying capacity and the wear resistance of the material are improved by utilizing fabric structures with relatively high order and compactness. However, the dispersed rigid filler particles and the loose fiber fabrics have very limited improvements in the mechanical properties and wear resistance of the composite, and may result in reduced self-lubricating properties of the material. Studies have shown that polytetrafluoroethylene substrates are susceptible to excessive wear and removal during friction due to insufficient load-bearing capacity of the fabric, resulting in fabric exposure, and rigid fibers are extremely prone to scratching the opposite surface, damaging the self-lubricating transfer film, and rendering lubrication ineffective.
Disclosure of Invention
The invention provides a zirconia frame reinforced polytetrafluoroethylene bionic composite material and a preparation method thereof, aiming at solving the problems of low bearing capacity and poor wear resistance of the existing polytetrafluoroethylene self-lubricating composite material.
The zirconia frame reinforced polytetrafluoroethylene bionic composite material provided by the invention is composed of an ordered porous zirconia ceramic frame and polytetrafluoroethylene filler, wherein the zirconia ceramic frame is 3mol% of yttria-stabilized tetragonal phase zirconia, and the polytetrafluoroethylene filler content is 70-80 vol%. The Vickers hardness of the surface of the bionic composite material is more than or equal to 40HV 1Kgf, the elastic modulus is more than or equal to 8000MPa.
The invention relates to a preparation method of a zirconia framework reinforced polytetrafluoroethylene bionic composite material, which comprises the following steps:
The preparation method comprises the steps of 1, preparing ceramic slurry by weighing a certain amount of ceramic powder, zirconium acetate, polyvinyl alcohol solution, sodium polyacrylate solution, polyether defoamer and deionized water, wherein the ceramic powder content is 40.0-60.0wt%, the zirconium acetate content is 5.0-7.0wt%, the polyvinyl alcohol solution content is 1.2-1.8wt%, the sodium polyacrylate solution content is 0.2-0.3wt%, the polyether defoamer content is 0.5-1.0wt%, mixing the ceramic slurry by using a planetary ball mill, the ball milling time is 10-18 h, the rotating speed is 280-310 r/min, and after ball milling, performing vacuum defoaming treatment on the ceramic slurry for 1-2 h, and the vacuum degree is less than or equal to-1.0 Mpa.
The method comprises the steps of 2, preparing a zirconia ceramic frame, namely, placing a die in a directional freezing device for precooling to-40 to-60 ℃, then injecting ceramic slurry into the die, freezing for 15-20 min, finally performing vacuum freeze drying for 24-48 h to obtain a ceramic biscuit, placing the ceramic biscuit in a silicon-molybdenum rod sintering furnace, heating to 400-600 ℃, preserving heat for 2-3 h, then continuously heating to 1500-1600 ℃, preserving heat for 2-3 h, finally cooling to 300-400 ℃ and cooling along with the furnace to obtain the ordered porous zirconia ceramic frame.
And 3, soaking and sintering polytetrafluoroethylene, namely placing the ceramic frame in polytetrafluoroethylene dispersion liquid for vacuum soaking treatment for 1-2 hours with the vacuum degree less than or equal to-1.0 Mpa, then placing the zirconia ceramic frame soaked in polytetrafluoroethylene dispersion liquid in an oven, drying for 24-48 hours at the drying temperature of 90-120 ℃, finally placing in a silicon-molybdenum rod sintering furnace, heating to 300-380 ℃, preserving heat for 0.5-1 hour, and cooling along with the furnace to obtain the zirconia-polytetrafluoroethylene bionic composite material.
Further, in the step 1, the ceramic powder is composed of 85.0-90.0wt% of zirconium dioxide, 5.0-10.0wt% of aluminum oxide, 1.0-2.0wt% of titanium dioxide, 1.0-2.0wt% of silicon dioxide and 1.0-2.0wt% of cerium dioxide nano particles, and the particle size is 30-100 nm.
Further, the zirconium dioxide powder is yttria-stabilized tetragonal phase zirconium oxide crystal particles.
Further, the mass fraction of the polyvinyl alcohol in the polyvinyl alcohol solution is 5.0-10.0wt%.
Further, the mass fraction of sodium polyacrylate in the sodium polyacrylate solution is 40.0-50.0wt%.
Further, in the step 2, the temperature rising rate and the temperature reducing rate in the sintering process are both 5-10 ℃ per minute.
Further, the temperature rising rate in the sintering process in the step 3 is 5-10 ℃ per minute.
Further, in the step 3, the mass fraction of the polytetrafluoroethylene dispersion is 40.0-60.0wt%, and the particle size of the polytetrafluoroethylene particles is 0.2-0.3 mu m.
The beneficial technical effects of the invention are as follows:
1) The invention provides a novel wear-resistant self-lubricating composite material, which solves the problems of low bearing capacity and poor wear resistance of the conventional polytetrafluoroethylene self-lubricating composite material by taking an ordered porous zirconia ceramic frame with high bearing capacity as a bearing phase, and meanwhile, the ordered porous zirconia ceramic frame has high porosity (more than or equal to 70 vol%) and can effectively contain polytetrafluoroethylene filler with a self-lubricating function so as to ensure that a self-lubricating transfer film is formed at a contact interface in the friction process, thereby realizing wear-resistant self-lubricating of the material and having great application prospects in the field of industrial lubrication.
2) Conventional directional freezing techniques can only produce sheet ceramic frames with relatively low carrying capacity and strength. According to the invention, zirconium acetate is added into ceramic slurry, growth orientation of ice crystals in a directional freezing process is regulated and controlled, an ordered porous zirconia ceramic frame with high bearing capacity is prepared, polytetrafluoroethylene with self-lubricating function is filled on the basis, and a self-lubricating composite material with a bionic microstructure is prepared. The preparation process of the material provided by the invention is simple and controllable, the required equipment is common equipment in the field, and the used raw materials are cheap, nontoxic and pollution-free and are easy for large-scale production.
Drawings
FIG. 1 is a schematic structural diagram of a zirconia framework reinforced polytetrafluoroethylene bionic composite material of the invention.
FIG. 2 is an optical photograph of a zirconia framework reinforced polytetrafluoroethylene biomimetic composite material of the present invention.
FIG. 3 is a scanning electron microscope photograph of the zirconia framework reinforced polytetrafluoroethylene bionic composite material surface of the invention.
Fig. 4 is a cloud chart of element distribution on the surface of the zirconia framework reinforced polytetrafluoroethylene bionic composite material.
FIG. 5 is a graph of the Vickers hardness and elastic modulus of polytetrafluoroethylene and the zirconia framework reinforced polytetrafluoroethylene biomimetic composite material of the present invention.
FIG. 6 is a graph of average coefficient of friction and wear volume for polytetrafluoroethylene and zirconia framework reinforced polytetrafluoroethylene biomimetic composite material surfaces.
Detailed Description
The invention will now be described in further detail with reference to the drawings and to specific examples.
The zirconia frame reinforced polytetrafluoroethylene bionic composite material disclosed by the invention is shown in figure 1, and consists of an ordered porous zirconia ceramic frame 1 and polytetrafluoroethylene filler 2, wherein the zirconia ceramic frame 1 is 3mol% of yttria-stabilized tetragonal zirconia, and the polytetrafluoroethylene filler 2 content is 70-80 vol%. The Vickers hardness of the surface of the bionic composite material is more than or equal to 40HV 1Kgf, the elastic modulus is more than or equal to 8000MPa. The optical photograph, scanning electron microscope photograph and element distribution cloud image of the bionic composite material are respectively shown in fig. 2, 3 and 4. The bionic composite material provided by the invention utilizes a bionic microstructure formed by an ordered porous zirconia ceramic frame with high bearing capacity and polytetrafluoroethylene filler with a self-lubricating function, so that the excellent self-lubricating performance of the material is ensured, and the bearing capacity and wear resistance of the material are greatly improved.
The preparation method of the zirconia framework reinforced polytetrafluoroethylene bionic composite material comprises the following steps:
1) Weighing 50.0wt%,6.0wt%,1.5wt%,0.3wt%,0.5wt% and 41.7wt% of ceramic powder, zirconium acetate, polyvinyl alcohol solution, sodium polyacrylate solution, polyether defoamer and deionized water, placing in a planetary ball mill, and ball milling for 12h at a rotating speed of 300r/min to obtain ceramic slurry.
2) And (3) carrying out vacuum defoaming treatment on the ceramic slurry for 1h, wherein the vacuum degree is less than or equal to-1.0 MPa.
3) And 2) injecting the ceramic slurry obtained in the step 2) into a die precooled to-45 ℃ in a directional freezing device, freezing for 15min, and then carrying out vacuum freeze drying for 24h to obtain the ceramic biscuit.
4) And placing the ceramic biscuit in a silicon-molybdenum rod sintering furnace, heating to 400 ℃, preserving heat for 2 hours, then heating to 1500 ℃, preserving heat for 2 hours, finally cooling to 400 ℃ and cooling along with the furnace to obtain the ordered porous zirconia ceramic frame. The temperature rising rate and the temperature falling rate in the sintering process are both 5 ℃ per minute.
5) And (3) placing the zirconia ceramic frame in polytetrafluoroethylene dispersion for vacuum impregnation treatment, wherein the treatment time is 0.5h, and the vacuum degree is less than or equal to-1.0 MPa.
6) The polytetrafluoroethylene dispersion impregnated zirconia ceramic frame was placed in an oven and dried for 24 hours at a drying temperature of 100 ℃.
7) And (3) placing the zirconia ceramic frame impregnated with the polytetrafluoroethylene dispersion obtained in the step (6) into a silicon-molybdenum rod sintering furnace, heating to 380 ℃, preserving heat for 0.5h and cooling along with the furnace to obtain the zirconia frame reinforced polytetrafluoroethylene bionic composite material. The temperature rising rate in the sintering process is 5 ℃ per minute.
Performance test:
1) And (3) surface hardness testing, namely testing the surface Vickers hardness of the zirconia frame reinforced polytetrafluoroethylene bionic composite material by adopting a KELITI ZB microhardness tester (Sichuan Ke Tex Intelligent technology Co., ltd.), wherein the normal load is 1Kgf, and the holding time is 15s.
The test results are shown in figure 5, and compared with polytetrafluoroethylene, the zirconia framework reinforced polytetrafluoroethylene bionic composite material has the advantage that the surface Vickers hardness is improved by about 7.8 times.
2) Elastic modulus test by uniaxial compression test, using Instron E1000 type electronic universal tester (Instron Co., ltd.) to test elastic modulus of zirconia frame reinforced polytetrafluoroethylene bionic composite material, wherein the pressure head dropping rate in the test process is 0.5mm/min, and the test sample size is 4×4×8mm 3.
The test results are shown in fig. 5, wherein the elastic modulus of the zirconia frame reinforced polytetrafluoroethylene bionic composite material is improved by about 32 times compared with polytetrafluoroethylene.
3) And (3) a reciprocating sliding friction and wear test, namely, testing the tribological performance of the zirconia frame reinforced polytetrafluoroethylene bionic composite material by using a UMT-TriboLab type multifunctional friction and wear tester (Bruce Co., USA). The test adopts a ball-plane contact mode, wherein GCr15 bearing steel balls with the diameter of 10mm are used as a friction pair, the normal load is 7N, the reciprocating displacement is 10mm, the frequency is 2Hz, and the cycle times are 7200 times.
As shown in the test result in figure 6, compared with polytetrafluoroethylene, the zirconia frame reinforced polytetrafluoroethylene bionic composite material has the advantages that the average friction coefficient of the surface is increased by about 11.71%, the excellent self-lubricating performance is still shown, the abrasion volume is reduced by about 99.95%, and the abrasion resistance is greatly improved.
In conclusion, the preparation method is simple and controllable, the required equipment is common equipment in the field, and the used raw materials are cheap, nontoxic and pollution-free and are easy to produce in large scale. Meanwhile, the zirconia frame reinforced polytetrafluoroethylene bionic composite material has excellent self-lubricating performance and wear resistance, overcomes the bottleneck problems of low bearing capacity and poor wear resistance of the traditional polytetrafluoroethylene self-lubricating composite material, realizes wear-resistant self-lubrication of the material, and has great application prospects in the field of industrial lubrication.
Claims (9)
1. The zirconia frame reinforced polytetrafluoroethylene bionic composite material is characterized by comprising an ordered porous zirconia ceramic frame (1) and polytetrafluoroethylene filler (2), wherein the zirconia ceramic frame (1) is 3mol% of tetragonal zirconia stabilized by yttrium oxide, and the polytetrafluoroethylene filler (2) is 70-80 vol%;
the Vickers hardness of the surface of the bionic composite material is more than or equal to 40HV 1Kgf, and the elastic modulus is more than or equal to 8000MPa.
2. The method for preparing the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 1, which is characterized by comprising the following steps:
the preparation method comprises the steps of 1, preparing ceramic slurry by weighing a certain amount of ceramic powder, zirconium acetate, polyvinyl alcohol solution, sodium polyacrylate solution, polyether defoamer and deionized water, wherein the content of the ceramic powder is 40.0-60.0wt%, the content of the zirconium acetate is 5.0-7.0wt%, the content of the polyvinyl alcohol solution is 1.2-1.8wt%, the content of the sodium polyacrylate solution is 0.2-0.3wt%, the content of the polyether defoamer is 0.5-1.0wt%, mixing the ceramic slurry by using a planetary ball mill, the ball milling time is 10-18 h, the rotating speed is 280-310 r/min, and after ball milling, carrying out vacuum defoaming treatment on the ceramic slurry for 1-2 h, wherein the vacuum degree is less than or equal to-1.0 Mpa;
Step 2, preparing a zirconia ceramic frame, namely placing a mould in a directional freezing device for precooling to-40 to-60 ℃, then injecting ceramic slurry into the mould, freezing for 15-20 min, and finally performing vacuum freeze drying for 24-48 h to obtain a ceramic biscuit;
And 3, soaking and sintering polytetrafluoroethylene, namely placing the ceramic frame in polytetrafluoroethylene dispersion liquid for vacuum soaking treatment for 1-2 hours with the vacuum degree less than or equal to-1.0 Mpa, then placing the zirconia ceramic frame soaked in polytetrafluoroethylene dispersion liquid in an oven, drying for 24-48 hours at the drying temperature of 90-120 ℃, finally placing in a silicon-molybdenum rod sintering furnace, heating to 300-380 ℃, preserving heat for 0.5-1 hour, and cooling along with the furnace to obtain the zirconia-polytetrafluoroethylene bionic composite material.
3. The preparation method of the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein in the step 1, the ceramic powder consists of 85.0-90.0wt% of zirconium dioxide, 5.0-10.0wt% of aluminum oxide, 1.0-2.0wt% of titanium dioxide, 1.0-2.0wt% of silicon dioxide and 1.0-2.0wt% of cerium dioxide nano particles, and the particle size is 30-100 nm.
4. The method for preparing a zirconia frame reinforced polytetrafluoroethylene bionic composite according to claim 3, wherein the zirconia powder is yttria-stabilized tetragonal zirconia crystal particles.
5. The preparation method of the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein the mass fraction of the polyvinyl alcohol in the polyvinyl alcohol solution in the step 1 is 5.0-10.0wt%.
6. The preparation method of the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein the mass fraction of sodium polyacrylate in the sodium polyacrylate solution in the step 1 is 40.0-50.0wt%.
7. The method for preparing the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein the heating rate and the cooling rate in the sintering process in the step 2 are both 5-10 ℃ per minute.
8. The method for preparing the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein the temperature rising rate in the sintering process in the step 3 is 5-10 ℃ per minute.
9. The method for preparing the zirconia frame reinforced polytetrafluoroethylene bionic composite material according to claim 2, wherein the mass fraction of polytetrafluoroethylene dispersion in the step 3 is 40.0-60.0wt%, and the particle size of polytetrafluoroethylene particles is 0.2-0.3 μm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310870754.1A CN116874957B (en) | 2023-07-17 | 2023-07-17 | Zirconia frame reinforced polytetrafluoroethylene bionic composite material and preparation method thereof |
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| CN101613511A (en) * | 2009-07-15 | 2009-12-30 | 天津工业大学 | A kind of polytetrafluoroethylene composite material and preparation method thereof |
| CN102942757A (en) * | 2012-11-05 | 2013-02-27 | 中国矿业大学 | Polytetrafluoroethylene composite friction material and preparation method thereof |
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| JP2004323789A (en) * | 2003-04-28 | 2004-11-18 | Toshiba Corp | Composite material for sliding member and method for producing the same |
| RU2421480C2 (en) * | 2009-08-27 | 2011-06-20 | Учреждение Российской академии наук Институт проблем нефти и газа Сибирского отделения РАН | Method of preparing wear-resistant composition |
| CN103333442B (en) * | 2013-06-08 | 2015-10-14 | 山东瑞特新材料有限公司 | TiO 2the preparation method of-SiC-fibre filling polytetrafluoroethyland matrix material |
| CN112063083A (en) * | 2020-08-26 | 2020-12-11 | 中国科学院兰州化学物理研究所 | A method for synergistically modifying polytetrafluoroethylene wear-resistant materials with multi-scale organic/inorganic fillers |
| CN114559043B (en) * | 2022-02-22 | 2023-06-16 | 武汉理工大学 | Self-lubricating composite material and preparation process thereof |
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| CN101613511A (en) * | 2009-07-15 | 2009-12-30 | 天津工业大学 | A kind of polytetrafluoroethylene composite material and preparation method thereof |
| CN102942757A (en) * | 2012-11-05 | 2013-02-27 | 中国矿业大学 | Polytetrafluoroethylene composite friction material and preparation method thereof |
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