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    Wyświetlanie 1-5 z 5
    Tytuł:
    The Effect of Sliding Motion on Tribological Characteristics of PA6 and Zinc-Borate Reinforced PA6 Composites
    Autorzy:
    Akinci, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1290677.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    12.60.Rc
    81.40.Pq
    Opis:
    The tribological characteristic of pure polyamide (PA6) and 2.5%, 5% zinc borate ($Zn_3BO_6$) filled (by wt) polyamide composites were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under the loads of 5, 10, and 20 N, and at the sliding speeds of 0.5, 1.0, and 1.5 m/s. The coefficients of friction of the materials were significantly influenced by an increase in zinc borate content. The friction coefficient of the PA6 was getting decreased from 0.420 to 0.188 with an increase in zinc borate content, depending on applied loads and sliding speeds. The results showed that the wear rates of pure PA6 and zinc borate filled polyamides increased with increase in loads. The wear rate of the PA6 decreased from 4.2 × $10^{-6} mm^3$/m to 5.0 × $10^{-7} mm^3$/m with an increase in zinc borate content depending on applied loads.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 475-477
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Influence of Load and Speed on Sliding Tribology of Silica-Polyamide Composites against AISI 4140 Steel
    Autorzy:
    Akinci, A.
    Powiązania:
    https://bibliotekanauki.pl/articles/1290761.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    12.60.Rc
    81.40.Pq
    Opis:
    The wear behavior of polyamide (PA6) matrix composites filled with silica particles is discussed in this paper. The tribological characteristics of pure PA6 and 5, 10, 30 wt% silica ($SiO_2$) filled PA6 composites were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under the loads of 5, 10, and 20 N and at the sliding speeds of 0.5, 1.0, and 1.5 m/s. The wear test results showed that the silica particles could improve the wear resistance and the friction coefficient of the PA6 matrix even though the content of the fillers was 5-30% by weight. The friction coefficient of the PA6 was getting decreased from 0.420 to 0.213 with an increase in silica content, depending on applied loads and sliding speeds. The results showed that the wear rates of pure PA6 and silica filled PA6 composites increase with increase in loads. The wear rate of the PA6 decreased from 4.2×$10^{-6} mm^3$/m to 6.0 × $10^{-7} mm^3$/m with an increase in silica content depending on applied loads. This makes it possible to develop novel type of polyamide-based composite with improved wear resistance for various applications.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 478-480
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Tribological Behaviors of $SiO_2$ Added Polyester Matrix Thermosetting Composites
    Autorzy:
    Akinci, A.
    Ozsoy, M.
    Firat, M.
    Sen, U.
    Powiązania:
    https://bibliotekanauki.pl/articles/1291866.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    12.60.Rc
    81.40.Pq
    Opis:
    In this study, the tribological behavior of polyester matrix composites filled with silicon dioxide ($SiO_2$) particles is investigated. The tribological characteristics of pure polyester and 10, 20, 30 and 40 wt% $SiO_2$ filled polyester composites were comparatively evaluated under dry sliding conditions. Wear tests were carried out at room temperature under the loads of 10, 20, and 30 N at the sliding speed of 1 m/s. The wear test results showed that the $SiO_2$ particles could improve the wear resistance. The friction coefficient of the polyester was getting increased from 0.228 to 1.1052 with an increase in $SiO_2$ content depending on applied loads. The results showed that the wear rates of pure polyester and $SiO_2$ filled polyester composites increased with increase in loads. The wear rates of the $SiO_2$ filled polyester composites were significantly affected from the $SiO_2$ content. The wear rate of the polyester changed from 8.0 × $10^{-7}$ $mm^3$/m to 1.72 × $10^{-5}$ $mm^3$/m depending on $SiO_2$ contents and applied loads.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 560-562
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Effect of $B_4C$ Content on the Mechanical and Tribological Performances of Polypropylene
    Autorzy:
    Dike, A.
    Mindivan, F.
    Mindivan, H.
    Powiązania:
    https://bibliotekanauki.pl/articles/1219326.pdf
    Data publikacji:
    2014-02
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Qk
    12.60.Rc
    81.40.Pq
    Opis:
    Boron carbide ($B_4C$) reinforced polypropylene (PP) was prepared by twin-screw extrusion and injection molding. In the present study, the effect of $B_4C$ content on the mechanical properties and wear behavior of the PP composites was studied. The tribological properties of the PP composites were investigated by a reciprocating wear tester under dry friction conditions. The results of the mechanical and wear test showed that the hardness and yield strength increased with increasing $B_4C$ content, while the incorporation of $B_4C$ into PP largely increased wear and friction under dry sliding. The composites have higher wear rates in comparison with unfilled PP and the greater the difference, the greater are the sliding velocities.
    Źródło:
    Acta Physica Polonica A; 2014, 125, 2; 396-398
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Some Aspects of Processing and Properties of Composite Material with Si-C Particles
    Autorzy:
    Nedelcu, D.
    Carcea, I.
    Tabacaru, L.
    Ciofu, C.
    Powiązania:
    https://bibliotekanauki.pl/articles/1503738.pdf
    Data publikacji:
    2011-08
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.05.Mh
    81.05.Ni
    81.05.Pj
    81.05.Qk
    12.60.Rc
    Opis:
    The processing of composite materials with metal matrix reinforced with carbon particles, graphite or SiC (Silicon Carbide) is decisively determined by the transfer of the reinforcing particles from the gaseous atmosphere into the molten metal and then by their transfer from liquid into solid. The degree of incorporation, the uniformity of particle distribution and finally all the properties of the composite materials depend on the way in which the transfer conditions from one phase to another have been accomplished. According to the thermodynamic principles, the transfer of the reinforcing particles from one phase to another can happen without external energy input only if the variation of the total free enthalpy is negative. The estimation of the direction of transfer can be done after the determination of critical measurements to the balance of forces that act on the reinforcing element. The particles wetted by the liquid metal and with density of its nearest will be integrated in the melt without external energy input, and those dry and light need additional energy consumption (powder injection, melt stirring etc.). The stalling speed of the SiC particles to the gas/liquid interface is influenced by the density difference and the reinforcing particles size. The critical moving speed of the solidification front is decisively influenced by the difference between $σ_{PS}$ and $σ_{PS}$, inter-phase tensions, as well as by the reinforcing particles size, if their density significantly differs from the one of the liquid alloy. Compared with the initially used alloy, the pull strength is doubled for some samples of obtained composite material. The ultrasonic testing disclosed the presence of some very small spots (porosities) which don't have a major influence on the tensile specimens subjected to pulling. From this reason, a very clear display of the bottom echo can be observed, which justifies the uniformity of the casting process. At the level of the matrix, the presence of the carbon to the separation limit between matrix and reinforcement can be observed, which confirms that during the processing Aluminium Carbide $Al_{4}C_{3}$ has been formed. The presence of these carbides considerably improves the wetting process.
    Źródło:
    Acta Physica Polonica A; 2011, 120, 2; 344-347
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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