scholarly journals Tribo-Mechanical Characterization of Carbon Fiber-Reinforced Cyanate Ester Resins Modified With Fillers

Polymers ◽  
2020 ◽  
Vol 12 (8) ◽  
pp. 1725 ◽  
Author(s):  
Ankur Bajpai ◽  
Prateek Saxena ◽  
Klaus Kunze
Keyword(s):  
Carbon Fiber ◽  
Wear Rate ◽  
Tensile Properties ◽  
Tribological Properties ◽  
High Performance ◽  
Tensile Tests ◽  
Cyanate Ester ◽  
Steel Shaft ◽  
Structural Applications ◽  
Fiber Matrix

High-performance polymer composites are being increasingly favored for structural applications. For this purpose, efforts are being focused on exploring the potential of high-performance thermoplastics and thermosets. Cyanate ester (CE) resin is a special thermoset that can be used at up to 400 °C without any considerable degradation; however, its tribological properties are not at the adequate level. Hence, it is needed to use this polymer in composite form with the fibrous/particulate reinforcement to impart better tribological properties and mechanical strength via a strong fiber–matrix interface. Carbon fiber/fabrics are at the forefront as reinforcement for specialty polymers. The tribological and tensile properties of cyanate ester (CE) composites-filled graphite, polytetrafluoroethylene (PTFE), and MoS2 micron-sized fillers reinforced with carbon fibers (CF) are investigated experimentally in a block-on-ring setup at 100 N, for 10 h, and with a sliding distance of approximately 10,000 m, against a hardened polished 100Cr6 steel shaft and diamond-like-coated (DLC) 100Cr6 steel shaft. The tribological properties of the composites including the coefficient of friction and specific wear rate are enhanced especially with the incorporation of graphite fillers. The friction coefficient and wear rate of the graphite-based composite was decreased significantly at 5 wt.% of graphite concentration. Further, at the same concentration, the graphite-based composite showed superior tensile properties as compared to the reference system owing to better dispersion and adhesion between the fibers and matrix. Tensile tests are performed to characterize the fiber–matrix interfacial adhesion and other strength properties.

scholarly journals Improving the Tribological Properties of Technical Polymers with Metal Sulphide Compounds

Lubricants ◽  
2021 ◽  
Vol 9 (9) ◽  
pp. 91
Author(s):  
Andreas Hausberger ◽  
Tanja Stiller ◽  
Clemens Kappl ◽  
Lars Hensgen ◽  
Florian Grün
Keyword(s):  
Wear Rate ◽  
Tribological Properties ◽  
Glass Fibre ◽  
High Performance ◽  
Solid Lubricants ◽  
Solid Lubrication ◽  
Wear Behaviour ◽  
Rate Reduction ◽  
Tribological Behaviour ◽  
Metal Sulphide

Technical thermoplastic materials (e.g., PEEK, PPA and POM) are widely used for tribological applications combined with different filler systems (e.g., glass- or carbon fibres) because of their excellent mechanical properties. The friction and wear behaviour of thermoplastics can be specifically improved by solid lubrication systems such as graphite, PTFE and MoS2. Besides these systems, others such as WoS2 and MnS are becoming scientifically interesting. This work investigates the influence of different solid lubricants—alternative metal sulphides and polymer-based—in combination with different glass fibre contents on the tribological behaviour of unfilled PEEK and glass fibre-filled PPA. For this purpose, compounds were produced and injection-moulded into tribological test specimens that were subsequently tested. It is particularly evident for both matrix materials that the solid lubricant SLS 22 shows a 25% wear rate reduction when compared to MoS2 and, in addition, the proportion of fibre content in PPA shows an additional wear rate reduction by a factor of 10. The friction level could be kept at a similar level compared to the usually utilised solid lubricants. The investigations showed the potential use of metal sulphide filler systems in high-performance thermoplastic with enhanced tribological properties as alternatives to the well-established solid lubricants.

The synergistic effect of SiC/R-GO composite on mechanical and tribological properties of thermosetting polyimide

2021 ◽  
pp. 002199832110492
Author(s):  
Aijiao Li ◽  
Suoxiao Wang ◽  
Zhe Chen ◽  
Hong Liu ◽  
Hongding Wang
Keyword(s):  
Friction Coefficient ◽  
Wear Rate ◽  
Tribological Properties ◽  
High Performance ◽  
In Situ Polymerization ◽  
Effective Means ◽  
Compression Modulus ◽  
Nanocomposite Films ◽  
Mechanical And Tribological Properties ◽  
Industry Applications

The effective means to solve material wear is to develop self-lubricating composite materials with excellent tribological, thermal, and mechanical properties. Herein, the composites of reduced graphene oxide (r-GO) nanosheet decorated with Silicon Carbide (SiC) were facilely prepared with employing a silane coupling agent, and the corresponding r-GO/SiC/thermosetting polyimide (r-GO/SiC/TPI) nanocomposite films were obtained by in situ polymerization method. The mechanical, tribological, and thermal properties of these nanocomposite films were investigated. When the content of r-GO/SiC was at 1.0 wt%, the compression strength and compression modulus of the composite increased by 37.7% and 47.3%, respectively, which were much higher than that of TPI composites addition of r-GO or SiC alone. Furthermore, r-GO/SiC/TPI composites also exhibited the lowest wear rate and friction coefficient in these reinforced TPI nanocomposites. When the content of r-GO/SiC was 0.8 wt%, particularly, the friction coefficient and wear rate of r-GO/SiC/TPI decreased by 22.8% and 79.8% compared to pure TPI, respectively. Additionally, trace amount r-GO/SiC hybrids also significantly enhance the thermal stability of TPI matrix. Compared to the polyimide composites reinforced by common nano-scale inorganic fillers, the outstanding mechanical and tribological properties of this r-GO/SiC/PI composites could be attributed to the ball on plane structure of GO/SiC, which lead to crack reflection, strength increment. These r-GO/SiC/TPI composites demonstrate the promising potential to be used as high-performance tribological materials in industry applications.

The Research on the Tribological Properties of C/C Composites

2011 ◽  
Vol 287-290 ◽  
pp. 675-678 ◽  
Author(s):  
Wen Xia Wang
Keyword(s):  
Carbon Fiber ◽  
Tribological Properties ◽  
Thermal Gradient ◽  
High Performance ◽  
Sliding Wear ◽  
Chemical Vapor ◽  
Chemical Vapor Infiltration ◽  
Three Point Bending ◽  
Mechanical And Tribological Properties ◽  
Wear Tests

The mechanical and tribological behaviors of the carbon/carbon (C/C) composites were evaluated by three-point bending and sliding wear tests. The effect of carbon fiber content on their mechanical behavior was also investigated. To produce the C/C composites, the precursor was introduced to the preforms by impregnating with phenolic solution. The C/C preforms were densified by thermal gradient chemical vapor infiltration. Results indicated that, the C/C composites show excellent mechanical and tribological properties. A kind of high performance brake materials was obtained.

Effects of Slit Patterns on the Tensile Properties of Unidirectionally Arrayed Chopped Strands Composites

2013 ◽  
Vol 750 ◽  
pp. 208-211
Author(s):  
Hang Li ◽  
Wen Xue Wang ◽  
Yoshihiro Takao ◽  
Terutake Matsubara
Keyword(s):  
Tensile Strength ◽  
Carbon Fiber ◽  
Tensile Properties ◽  
Failure Modes ◽  
Tensile Tests ◽  
Short Fiber ◽  
Fiber Reinforced Polymer ◽  
Carbon Fiber Reinforced Polymer ◽  
Fiber Reinforced ◽  
Reinforced Polymer

This study investigates the tensile properties of UACS (unidirectional arrayed chopped strands) laminates with different slit patterns. UACS composite is a kind of short fiber reinforced polymer by introducing slits into prepregs before the fabrication of laminates. Existing UACS composites have superior flowability but relatively low tensile strength compared to conventional CFRP (carbon fiber reinforced polymer). Consequently, many efforts have been made to improve the strength of UACS composites. In this study, two new discontinuous slit patterns, staggered pattern and bi-angled pattern, have been developed. Tensile tests reveal that two new UACS laminates with staggered and bi-angled slit patterns have higher strength and higher stiffness than existing UACS laminates with continuous slits. Discontinuity of slits plays an important role in inhibiting the development of delamination. Different slit patterns show different failure modes.

Mechanical and Tribological Properties of Polyimide Composite Reinforced with Carbon Fibers and Carbon Nanotube

2011 ◽  
Vol 311-313 ◽  
pp. 189-192
Author(s):  
Rui Ya Rong ◽  
Zhen Hua Li ◽  
Yun Xuan Li ◽  
Chi Lan Cai
Keyword(s):  
Carbon Nanotube ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Beneficial Effect ◽  
Carbon Fibers ◽  
Friction And Wear ◽  
Tensile Tests ◽  
Reinforced Composites ◽  
Mechanical And Tribological Properties ◽  
The Coefficient Of Friction

Reinforced polyimide composite with of carbon fiber and carbon nanotube were prepared by hot molding technology. The mechanical and friction and wear behaviors of the reinforced composites were studied. Tensile tests showed that SCF and CNT exhibit a beneficial effect for restoring the stiffness of the CF/PI composite. The carbon fiber reinforcement was found effective in reducing the coefficient of friction and the wear rate. This implied that the CNT improves the adhesion between SCF and PI.

Research on the Influence of Artificial Ageing on the Tensile Properties of Plastic Coated Composites with Fabric Inserts, in the Presence of Simulated Welding Imperfections

2014 ◽  
Vol 1029 ◽  
pp. 224-229
Author(s):  
Lorand Kun ◽  
Alin Constantin Murariu
Keyword(s):  
Tensile Properties ◽  
High Performance ◽  
Cooling System ◽  
Tensile Force ◽  
Tensile Tests ◽  
Uv Exposure ◽  
Clear Correlation ◽  
Artificial Ageing ◽  
Forced Cooling ◽  
Uv Lamps

An experimental research regarding the effects of artificial ageing by UV exposure on the tensile properties of a plastic coated composite material with fabric inserts, used mainly in the production of truck covers is presented in this paper. For the purpose of artificial ageing, the authors designed and built at ISIM Timisoara an original equipment with high performance UV lamps, adjustable geometry and forced cooling system. Defects of different sized were created in the aged and not aged specimens in order to simulate potential imperfections that appear during the joining process of these materials. The influence of artificial ageing with 24h and 48h exposure and imperfection size is highlighted by comparative analysis of the results obtained from the tensile tests that were carried out on all specimens. The results are further compared to the tensile properties of aged and not aged welded specimens, obtained using high frequency current and hot air welding methods. The results show clear correlation between the imperfection size and the maximum tensile force and the elongation at break respectively. It is concluded however that further testing is necessary in the specially built equipment in order to properly describe the effect of accelerated artificial ageing by UV exposure on the tensile properties of plastic coated composite materials with fabric inserts.

A Comparative Experimental Study on Tensile Properties of Three Types of High-Performance Polymer Fibers

2011 ◽  
Author(s):  
X.-L. Gao ◽  
S.-S. Zhou ◽  
S. E. Bosselman ◽  
J. Q. Zheng
Keyword(s):  
Experimental Study ◽  
Elastic Modulus ◽  
Tensile Properties ◽  
High Performance ◽  
Tensile Tests ◽  
Polymer Fibers ◽  
Breaking Stress ◽  
Strong Temperature Dependence ◽  
Breaking Strain ◽  
High Performance Polymer

A comparative experimental study on tensile properties of three types of high-performance polymeric fiber yarns — AuTx™, Kevlar® KM2 600 denier and Twaron® 500 denier — is conducted. Tensile tests are performed on samples of the three kinds of fiber yarns at five testing temperatures (24, 50, 60, 70 and 80 °C) and three loading rates (100, 200 and 300 mm/min). The elastic modulus, breaking stress, and breaking strain are obtained for each type of fiber yarns under specified testing conditions as averages of measured values from 15 specimens. The experimental data reveal that the tensile properties of all three types of fiber yarns under investigation exhibit strong temperature dependence, with the elastic modulus and breaking stress decreasing with the temperature increase. However, the dependency of the properties on the loading rate is insignificant for the range considered. The measured tensile properties of the Kevlar® and Twaron® yarns are seen to be close, while the elastic modulus and breaking stress of the AuTx™ yarn are found to be, respectively, about 12% and 40% higher than those of the Kevlar® and Twaron® fiber yarns. It is also observed that the AuTx™ yarn degrades about two times faster than the other two yarns as temperature increases.

Effect of Carbon Fiber Reinforcement on the Mechanical and Tribological Properties of PA6/PPS Composites

2012 ◽  
Vol 476-478 ◽  
pp. 2323-2327
Author(s):  
Shao Feng Zhou ◽  
Chao Qun Wu ◽  
Lian Hui Chen ◽  
Qiao Xin Zhang
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Impact Strength ◽  
Wear Rate ◽  
Tribological Properties ◽  
Elongation Rate ◽  
Polymer Materials ◽  
Mechanical And Tribological Properties ◽  
Practical Guidance ◽  
Different Content

The mechanical and tribological properties of PA6/PPS blend reinforced by different content of carbon fiber were studied in the manuscript. It was found that the strength, modulus and hardness of PA6/PPS blend is improved apparently though breaking elongation rate and impact strength decreases to some extent. Average friction coefficient value of the carbon fiber reinforced PA6/PPS (PA6/PPS-CF) composites at the state stage is lower than PA6/PPS blend and PA6/PPS-CF10% exhibits the lowest friction coefficient of 0.34. As the content of carbon fiber increases, wear rate of the PA6/PPS-CF composites trends to increasing. These results is useful for providing some practical guidance for the application of polymer materials in the tribological field.

Thermo Mechanical Treatment of Nickel and Titanium Aluminides

2005 ◽  
Vol 237-240 ◽  
pp. 653-658
Author(s):  
Vijaya Agarwala ◽  
Joanna Karwan-Baczewska
Keyword(s):  
Grain Size ◽  
High Temperature ◽  
Nickel Aluminide ◽  
High Performance ◽  
Titanium Aluminides ◽  
Flow Behavior ◽  
Tensile Tests ◽  
Arbitrary Parameter ◽  
Average Grain Size ◽  
Structural Applications

Polycrystalline Ni3Al and TiAl are attractive materials for high temperature structural applications due to their stability in oxidizing and sulphidizing environment upto700 0 C. They possess significantly higher specific stiffness and similar specific strength as that of super alloys. Hence, these materials can replace super alloys for high temperature applications (~900°C). TiAl has lesser density and can be used for reducing component weight up to 50% and suitable for aerospace and automobile (high performance vehicles) sectors. The major difficulty for putting Ni3Al for engineering applications is its extremely low ductility and inter-granular fracture at ambient temperatures. TiAl, apart from the said brittleness it also suffers from high temperature corrosion. However the brittleness of these aluminides can be reduced by micro-alloying and by subjecting them to Thermo Mechanical Treatments, TMT. This paper deals with the recrystallization studies on nickel aluminides, deformed to different extents by rolling. The average grain size dependence with the % elongation is evaluated in the grain size range of 10-35micron. For the nickel aluminide deformed for 50% by rolling, the variation of resistivity and hardness with annealing time is determined. The homogenized TiAl samples were cold worked and annealed at 1000 0 C. Since the aluminide suffers from low ductility at room temperature, an arbitrary parameter, electrical resistivity, was chosen. Corresponding hardness values were also obtained. Finally a qualitative determination of ductility was made by studying the flow behavior of alloy around the hardness indentation. Thus a correlation was developed between resistivity, hardness and ductility values. It was then to some extent possible to investigate the TMT cycles on the microstructure and hence on the ductility of the TiAl without going for the actual tensile tests.

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