scholarly journals Influence of the structure and thermomechanical properties of oriented carbon plastics on their tribotechnical characteristics

2021 ◽  
Vol 3 (12 (111)) ◽  
pp. 48-58
Author(s):  
Aleksandr Dykha ◽  
Olga Drobot ◽  
Viktor Oleksandrenko ◽  
Svitlana Pidhaichuk ◽  
Pavlo Yaroshenko ◽  
...  
Keyword(s):  
Friction Coefficient ◽  
Carbon Fiber ◽  
Microstructural Analysis ◽  
Operating Conditions ◽  
Carbon Plastic ◽  
Friction Units ◽  
Carbon Plastics ◽  
Fiber Plastic ◽  
Plastic Metal ◽  
Carbon Fiber Plastic

It has been established that carbon plastics are increasingly used in various industries as structural materials. By the set of their properties, carbon plastics outperform steel, cast iron, alloys of non-ferrous metals. However, the application of these materials for parts of machine friction units is still limited due to the difficult operating conditions of modern tribosystems. This work aims to conduct a comprehensive experimental study of the tribological properties of materials in the tribosystem "carbon plastic-metal" taking into consideration their structure, as well as the mechanical-thermal characteristics. Comparative tests of the dependence of the friction coefficient on load for metal and polymeric anti-friction materials have shown a decrease in the friction coefficient for plastics by 3...4 times (textolite, carbotextolite, and carbon-fiber plastics). The influence of the filler orientation relative to the slip plane on the anti-friction properties of carbon-fiber plastics was investigated; it was found that the direction of fiber reinforcement in parallel to the friction area ensures less carbon-fiber plastic wear. A linear dependence of the wear intensity of carbon-fiber plastics, reinforced with graphite fibers, on the heat capacity and energy intensity of the mated steel surface has been established. Based on the microstructural analysis, a layered mechanism of the surface destruction of carbon-fiber plastics was established caused by the rupture of bonds between the fiber parts, taking into consideration the direction of the fibers' location to the friction surface. The results reported here could provide practical recommendations in order to select the composition and structure of materials for the tribosystem "carbon-fiber plastic-metal" to be used in machine friction units based on the criterion of improved wear resistance

Correlation between Carbon Fibres/Carbon Nanotubes Fillers and Wear Behaviour of Poly(ether-ether-ketone) Composite

2015 ◽  
Vol 808 ◽  
pp. 113-118
Author(s):  
Dan Catalin Trufasu ◽  
Maria Aida Cristina Besnea ◽  
Adrian Cotet ◽  
Gabriel Andrei
Keyword(s):  
Carbon Nanotubes ◽  
Friction Coefficient ◽  
Carbon Fiber ◽  
Wear Rate ◽  
Operating Conditions ◽  
Wear Behaviour ◽  
Ether Ether Ketone ◽  
Peek Composite ◽  
Poly Ether Ether Ketone ◽  
Ether Ketone

The wear behaviour of poly (ether-ether-ketone) (PEEK) composite was investigated according to the load and test speed. Three types of materials were studied: first, neat PEEK, PEEK with 30 wt. % carbon fiber (PEEK CF30), and third, PEEK with carbon nanotubes (PEEK ELS NANO). Tribological tests were performed on the universal tribometer UMT-2, using a pin-on-disc device. The friction coefficient and wear rate for the composites studied were analysed. Tests carried out have allowed the examination of the influence of load and speed on the friction coefficient and wear rate under dry sliding regime. Also, structural changes were noticed by optical and SE microscopy, and wear types of surface were discussed. As a result of experimental tests, it was established that PEEK composite with carbon fiber/carbon nanotubes exhibit good wear behaviour under operating conditions.

Chemical stability of �pan carbon fiber plastic in various media

1986 ◽  
Vol 22 (7) ◽  
pp. 341-344
Author(s):  
I. S. Revenkova ◽  
A. V. Goryainova ◽  
L. L. Loichuk
Keyword(s):  
Carbon Fiber ◽  
Chemical Stability ◽  
Fiber Plastic ◽  
Carbon Fiber Plastic

Theoretical Assessment Of The Bearing Capacity Of A Steel Beam Reinforced With Carbon Fiber

2020 ◽  
pp. 18-22
Keyword(s):  
Carbon Fiber ◽  
Bearing Capacity ◽  
Adhesive Layer ◽  
Carbon Plastic ◽  
Steel Beams ◽  
Steel Beam ◽  
Fiber Plastic ◽  
Fiber Materials ◽  
Short Time ◽  
Theoretical Assessment

To reinforce steel beams, modern carbon fiber materials that are attached to the beam from the stretched side using a special two-component adhesive can be effectively used. Compared to traditional methods of cross-section increase by means of additional steel elements attached by welding or on bolts, reinforcing with carbon fiber plastic has a number of advantages. Carbon plastic has a much smaller weight than a steel element that has the same load-bearing capacity; the adhesive layer prevents corrosion of the reinforced element; work on strengthening is carried out in a short time and with less labor expenditures etc. The article presents the results of theoretical studies of beams reinforced with carbon fiber lamellas. For the theoretical assessment of the strength of a reinforced steel beam, deformations and stresses in the section at the elastic, elastic-plastic and plastic stages of steel work are considered. It is established that a significant effect of carbon fiber reinforcement is observed even when the stresses in it are determined by the strength of the adhesive joint. Formulas, taking into account the strength of the adhesive layer determined experimentally, for determining the strength of a reinforced beam are obtained. A theoretical model of the operation of bent steel elements is constructed and theoretical dependencies are obtained that can be used for calculations of steel beams reinforced with carbon plastic.

Strength of a cross-reinforced carbon-fiber plastic under impact loads

1984 ◽  
Vol 16 (8) ◽  
pp. 1087-1091
Author(s):  
K. K. Dudka ◽  
I. N. Preobrazhenskii
Keyword(s):  
Carbon Fiber ◽  
Impact Loads ◽  
Fiber Plastic ◽  
Carbon Fiber Plastic

INFLUENCE OF ADDITIONAL SIZING OF CARBON FIBER IN PRODUCING VOLUME-REINFORCED PREFORMS ON THE PROPERTIES OF HIGH-TEMPERATURE CARBON FIBER

2021 ◽  
pp. 54-65
Author(s):  
A.V. Nacharkina ◽  
◽  
I.V. Zelenina ◽  
M.I. Valueva ◽  
O.G. Voronina ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Thermal Analysis ◽  
High Temperature ◽  
Carbon Fiber ◽  
Moisture Absorption ◽  
Experimental Studies ◽  
Physical And Mechanical Properties ◽  
Carbon Plastic ◽  
Carbon Plastics ◽  
Operational Factors

Presents the results of experimental studies of the effect of additional apparet on the properties of high-temperature carbon plastic based on a heat-resistant thermosetting phthalonitrile binder and a volume-reinforced woven preform. Comparative data are given on physical and mechanical properties of carbon plastics based on preforms with and without an apparet, including after exposure to operational factors (thermal aging, water and moisture absorption), results of thermal analysis and microstructure research.

Influence of carbon fiber on tribotechnical characteristics of polyetheretherketone

2020 ◽  
Vol 98 (4) ◽  
pp. 27-32
Author(s):  
O. Buria ◽  
◽  
A.-M. Tomina ◽  
I. Nachovnyi ◽  
◽  
...  
Keyword(s):  
Carbon Fiber ◽  
Transfer Film ◽  
Fiber Content ◽  
Polymer Fiber ◽  
Ultrasonic Control ◽  
Dispersed Particles ◽  
Friction Units ◽  
Carbon Plastics ◽  
Base Polymer ◽  
Tribotechnical Characteristics

Superstructural thermoplastic polymers, including polyetheretherketone, are now widely used in many industries. However, its rather high coefficient of friction and insufficient wear resistance limits its use in friction units of machines and mechanisms. This article covers the influence of T700 Toray carbon fiber on the tribotechnical characteristics of Victrex150G aromatic polyetheretherketone. As a result of the researches it has been found out that the developed carbon plastics exceed the base polymer in friction coefficient and wear 1.2-1.54 and 1.7-8.8 times, respectively, due to the formation of a stable "transfer film" on the steel counterbody (so-called antifriction layer): finely dispersed particles of the polymer matrix and crushed products of wear of carbon fiber penetrate into the microcavities of the counterbody. This is confirmed by the fact that the roughness of carbon plastics has decreased by 50 % in cpomparison with the base polymer. The greatest improvement in tribological properties is observed at 10 mass%, of carbon fiber content, then the properties get worse. That can be explained by the increase in defects of the material due to the dominant loosening at the "polymer-fiber" boundary that confirms the results of microhardness and ultrasonic control. The obtained results show that the composite with an effective carbon fiber content (10 mass%) can be recommended for the manufacture of parts of movable joints of machines and mechanisms operating under friction without lubrication in various industries: agricultural, automotive and textile. etc.

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