Shape memory composites now have a wide range of applications in aerospace, medical devices, and smart structures. Seven graphene-carbon oxide/ glass fiber (GO-CF/GF) hybrid reinforced shape memory composites were prepared using vacuum infiltration hot pressing system (VIHPS) and the shape memory properties of the materials were investigated in 100 degrees C test. By comparing and analyzing the microstructure and shape memory properties of composites containing different volume fractions of GFs, the mechanism of the influence of different hybrid contents of GFs on the organizational properties and shape memory properties was investigated. The results show that when the reinforcement of the composites were all carbon fibers, the composites had the largest elasticity modulus, harder material and the fixation rate of 77.15%, the recovery rate of 95.17%, the porosity of 0.80% and the shape recovery force of 7.98 N. When the reinforcement of the composites were glass fibers, the composites had the smallest elasticity modulus, softer material and the fixation rate of 94.89%, the recovery rate of 77.21%, the porosity of 13.56% and the recovery force of 2.28 N. The results of this test can lay a foundation for subsequent research on fibers with different mixing ratios. Highlights The GO-CF/GF/EP prepared by VIHPS has excellent shape memory properties. Fiber hybrid ratio affects the composite's porosity and its properties. Fiber hybrid ratio affects the composite's shape fixation, recovery, and memory force. The shape fixation of G6 decreases the lowest with test cycles. Carbon fiber content changes the zero-stress plane of GO-CF/GF/EP.

Currently, few studies have been conducted on the use of fluorocarbon resin (FEVE) and polytetrafluoroethylene (PTFE) as adhesive substrates and lubricating and anti-corrosion fillers, respectively, for the fabrication of PTFE-reinforced fluorocarbon composite coatings. In this paper, the tribological properties of polytetrafluoroethylene-reinforced fluorocarbon composite coatings were investigated through orthogonal tests under various operating conditions. The optimal configuration for coating preparation under dry friction and aqueous lubrication was thus obtained: the optimal filler particle size, mass ratio of FEVE to PTFE, spraying pressure, and curing agent content were 50 μm, 3:4.5, 0.3 MPa, and 0.3, respectively. Under oil lubrication, the corresponding optimal values were 5 μm, 3:4.5, 0.3 MPa, and 0.3, respectively. Tribological tests revealed that the best overall performance of the FEVE/PTFE coating was obtained when the mass ratio of FEVE to PTFE was 3:4.5, and the filler particle size also significantly affected the tribological properties under different environments, including the friction coefficients of the FEVE/50 μm-PTFE coating under both dry friction and aqueous lubrication, as well as the friction coefficient of the FEVE/5 μm-PTFE coating under oil lubrication. These coefficients were 0.067, 0.062, and 0.055, representing decreases of 86%, 92%, and 56%, respectively, compared to those of the pure FEVE coating under the same working conditions. This research was conducted with the goal of expanding the application of fluorocarbon coatings in the field of tribology.

Graphene oxide-carbon fiber (GO-CF) hybrid reinforced shape memory composites were prepared based on vacuum infiltration hot compression molding test process, and the microstructure and shape memory properties of the composites were compared and analyzed when the test temperature was 50 degrees C, 60 degrees C, 70 degrees C, 80 degrees C, 90 degrees C, 100 degrees C, 110 degrees C and 120 degrees C by changing the test temperature to investigate the effect of test temperature on the microstructure. The results showed that when the test temperature was low, the microstructure and shape memory properties of the composites were not affected. There were fewer matrix in the infiltrated gaps between the fibers and the infiltration effect was not ideal; when the test temperature reached the glass transition temperature, the infiltration effect was the best; when the test temperature exceeded the glass transition temperature, the matrix modulus decreased rapidly, the resin matrix became soft and the carbon fibers were pulled out. The shape fixation rate, shape recovery rate and maximum recovery force of the composites increased and then decreased as the test temperature increased. As the number of cycles increased, the fixation rate of GO-CF/EP composites decreased the composites appear different degrees of damage, shape fixation rate, recovery rate and recovery force changes

为提高超疏油/超亲水涂层的机械耐久性,首次提出以碳纳米管、正硅酸乙酯和丙烯酸树脂为原料,加入全氟辛酸和壳聚糖季铵盐进行改性,喷涂制备出一种具有高机械耐久性的油水分离网.利用接触角测试、砂纸磨损实验和油水分离实验,评价分离网的润湿性、机械耐久性和油水分离能力,并通过光学显微镜和扫描电子显微镜对涂层磨损前后的形貌变化进行分析.结果表明,当碳纳米管掺杂量为1.5％时,制备的涂层油接触角为155.5°,水接触角为0°,具有良好的超润湿性;经过160次砂纸磨损实验,仍保持超疏油/超亲水状态,表现出优异的机械耐久性;在油和水(碱性、酸性、中性、冷、热)的混合溶液中均有96％以上的分离效率和1.6×104 L/(m2·h)以上的渗透通量,经过20次分离后分离效率为96.33％,具有良好的油水分离能力.

TA-CNTs/SiO2 black transparent coated slides with self-cleaning and anti-fogging effects were obtained from slides sprayed with the dispersion of tannic acid modified carbon nanotubes(TA-CNTs),dendritic nano SiO2 sol and ethyl orthosilicate(TEOS)hydrolysates and cured at room temperature.The carbon nanotubes before and after modification were characterized by FTIR,TEM and TG,the morphology and elemental composition of the coating were analyzed by SEM,AFM and XPS.The influence of mass of TA-CNTs and TEOS hydrolysate on the contact angle(CA)of the coating as well as the mass of TA-CNTs in the coating with a unit area on the light transmittance of the coating were explored via the contact angle measuring instrument and UV-Vis spectrophotometer,and the anti-fogging performance,self-cleaning property and wear resistance of the coating were evaluated.The results showed that,when the mass of TEOS hydrolysate and TA-CNTs was 6.00 g and 0.16 g respectively,the coating displayed super-hydrophilicity(CA was 2.5°)and excellent self-cleaning and anti-fogging effects.After 120 times of friction experiments,the coating still maintained super-hydrophilicity and showed certain wear resistance.The addition of TA-CNTs made the coating surface rougher,which was conducive to reduction of light reflection and pollution.Moreover,when the mass of TA-CNTs in the coating per unit area was 2.0×10-3 g/cm2,the light transmittance of the coating decreased to 60%,and the coating could keep privacy while maintaining certain transparency.

通过使用3种不同粒径（0.5、5.0和50.0μm）的聚四氟乙烯（PTFE）功能填料与氟烯烃/乙烯基醚共聚树脂（FEVE）进行混合，采用喷涂法及常温固化工艺在载玻片表面制备了具有不同润湿性的FEVE/PTFE氟碳复合涂层，并评价了涂层的表面润湿性、附着力和耐磨性。结果表明：PTFE与FEVE的质量比为1.5时所制备的复合涂层具有优良的疏水性和附着力，水接触角最大约为153.1°。与干摩擦工况相比，涂层在水润滑状态下的摩擦因数更低。以粒径50μm的PTFE制备的FEVE/PTFE复合涂层在超疏水状态下的摩擦因数低至0.061 5。该FEVE/PTFE复合涂层不仅具有良好的耐磨性，而且疏水效果稳定。

以三氟氯乙烯/四氟乙烯-烷基乙烯基醚/酯(FEVE)为基料,使用3种不同粒径的聚四氟乙烯(PTFE)作为润滑防腐填料,采用喷涂法及室温固化在样片表面制备了兼具减摩和耐腐蚀功能的氟碳复合涂层材料.通过力学性能测试对复合涂层的硬度和粘附力进行评价.通过多功摩擦磨损试验机测试涂层在干摩擦以及水、油润滑环境下的减摩性能并进行分析.通过涂层浸泡实验和扫描电子显微镜(SEM)对复合涂层的耐腐蚀性能进行表征和分析.结果表明,适量的PTFE可以有效降低氟碳复合涂层的摩擦因数,当PTFE与FEVE的质量比为4.5∶3时,涂层在干摩擦、水润滑时的摩擦因数分别为0.067、0.062,与纯FEVE涂层相比分别降低了 85％和92％.此外,当PTFE粒径为5 μm时,涂层在油润滑条件下摩擦因数仅为0.055,同时复合涂层具有优异的耐腐蚀性能.

为提高湿法脱硫后烟囱内壁防护涂层的防腐性能,以氟碳树脂(PEVE)和聚四氟乙烯(PTFE)粒子为原料,采用喷涂工艺及室温固化制备出具有抗粘附性能的防腐蚀氟碳复合涂层.利用硫酸腐蚀实验、抗粘附冷凝实验、耐温实验、耐磨性实验,分别评价涂层的耐酸性、抗粘性、耐温性、耐磨性,并通过扫描电子显微镜对腐蚀前后涂层的形貌变化进行分析.结果表明,当PTFE:PEVE的质量比为1:2时,制备的PTFE/PEVE复合涂层在竖直倾角小于5°且酸气温度小于60℃时,表面未出现酸性冷凝液附着,具有优异的抗粘附特性;且分别经室温20％H2SO4浸泡90 d和低温(50℃)10％H2SO4的浸泡7 d,涂层表现出较强的耐酸性能;涂层表面能承受200℃的高温而不发生脱落、鼓包、开裂等现象,具有良好的耐温性能.此外,受力氟碳复合涂层在砂纸上拖行200 cm后,表面疏水角度降为150.2°,依旧保持超疏水状态,具有良好的耐磨性.

Combined with our teaching reform project,through to the 5 domestic university about the course of machinery manufacturing technology foundations teaching situation investigating,The report comprehensively analyzes the teaching status and existing problems,puts forward related suggestions,and provides help with a view to the course teaching reform in the future.

According to the culture goal of Mechanical Engineering application talent and characteristics of the course of Machinery Manufacturing Technology Foundation,the paper discusses the teaching reform from the following aspects: the teaching content,the teaching method,the teaching tool,check-up system etc.