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    Wyświetlanie 1-4 z 4
    Tytuł:
    The effects of B₄C amount on hardness and wear behaviours of 7075-B₄C composites produced by powder metallurgy method
    Autorzy:
    Ay, H.
    Özyürek, D.
    Yıldırım, M.
    Bostan, B.
    Powiązania:
    https://bibliotekanauki.pl/articles/1155410.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    81.40.Pq
    Opis:
    In this study, the effects of B₄C amount on hardness and wear behaviours of 7075 Al-B₄C composites produced by powder metallurgy method were investigated. Within the scope of work, different amount of B₄C (3, 6, 9%) added into gas atomized 7075 Al powders. The powders were mixed in Turbula with 67 rpm for 45 min. Then the composite powders were pre-shaped by cold pressing under 600 MPa pressure. Pre-shaped samples were sintered in atmosphere controlled furnace at 580°C for 4 h. Scanning electron microscope, X-ray diffraction examinations and hardness measurements were carried out after standard metallographic processes. Wear tests were performed in a pin on type wear apparatus under 30 N with 1 m s¯¹ sliding speed, at six different sliding distances (500-3000 m). Results show that the hardness was increased with increasing of amount of B₄C. At the end of wear tests the lowest weight loss were found to 9% B₄C containing composites. In addition, it is determined that the weight loss increased with increasing sliding distance.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 565-568
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Characteristic of low-density polyethylene reinforcement with nano/micro particles of carbon black: a comparative study
    Autorzy:
    Sabr, O.H.
    Al-Mutairi, N.H.
    Layla, A.Y.
    Powiązania:
    https://bibliotekanauki.pl/articles/2175763.pdf
    Data publikacji:
    2021
    Wydawca:
    Stowarzyszenie Komputerowej Nauki o Materiałach i Inżynierii Powierzchni w Gliwicach
    Tematy:
    low-density polyethylene
    carbon black
    thermal conductivity
    nanocomposite
    SEM
    polietylen wysokociśnieniowy
    sadza
    przewodność cieplna
    nanokompozyt
    Opis:
    Purpose: Low density polyethylene is commonly used polymer in the industry because of its unique structure and excellent overall performance. LDPE, is relatively low mechanical properties and thermal stability can sometimes limit its application in industry. Therefore, the development of particulate reinforced polymer composites is one of the highly promising methodologies in the area of next generation engineering products. Design/methodology/approach: Nano and Micro composite from low density polyethylene LDPE reinforced with different weight fraction of carbon black particles (CB) (2, 4 and 8)% prepared by first dispersion Nano and Micro carbon black particles CB in solvent and then mixing manually with low density polyethylene LDPE pellet and blended by twin-screw extruder, the current research study the mechanical properties (tensile strength, elastic modulus,and hardness), FTIR, DSC,and thermal conductivity of prepared nano and micro composites using two methodes and the morphological properties of nano-micro composites. Findings: The tensile strength of the LDPE/CB nano and micro composites improved at 2% and 4%, respectively, and decreasing at 8%, addition of carbon black nanoparticles led to increase the tensile strength of pure low-density polyethylene from 13.536 MPa to 19.71 MPa, and then dropping to 11.03 MPa at 8% percent,while the elastic modulus of LDPE/ CB nano and miro composites shows an improvement with all percentages of CB. The results show that the mechanical properties were improved by the addition carbon black nanoparticles more than addition micro- carbon black . FTIR show that physical interaction between LDPE and carbon black. The thermal conductivity improvement from 0.33 w/m.k for pur LDPE to 0.62234 w/m.k at 2% CB microparticle content and the reduced to 0.18645 w/m.k and 0.34063 w/m.k at (4 and 8)% micro-CB respectively , The thermal conductivity of LDPE-CB nano-composites is low in general than that the LDPE-CB microcomposite. DSC result show improvement in crystallization temperature Tc, melting temperature and degree of crystallization with addition nano and micro carbon black. Morever, SEM images revealed to uniform distribution and good bonding between LDPE and CB at low percentages and the precence of some agglomeration at high CB content. Research limitations/implications: This research studied the characteristics of both nano and micro composite materials prepared by two steps: mixing CB particles with solvent and then prepared by twin extruder which can be used packaging material, but the main limitation was the uniform distribution of nano and micro CB particles within the LDPE matrix. In a further study, prepare a blend from LDPE with other materials and improve the degradation of the blend that used in packaging application. Originality/value: LDPE with nanocomposites are of great interest because of their thermal stability, increased mechanical strength, stiffness, and low gas permeability, among other properties that have made them ideal for applications in the packaging and automotive industries. LDPE reinforcements nano-sized carbon black can have better mechanical and thermal properties than micron, resulting in less material being needed for a given application at a lower cost.
    Źródło:
    Archives of Materials Science and Engineering; 2021, 110, 2; 49--58
    1897-2764
    Pojawia się w:
    Archives of Materials Science and Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evaluation of Biodegradable Fixation System for Mandibular Angulus Fracture by Using Finite Element Method
    Autorzy:
    Ay, M.
    Hartomacioglu, S.
    Bakircioglu, B.
    Yuzbasioglu, H.
    Kubat, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/1186920.pdf
    Data publikacji:
    2016-04
    Wydawca:
    Polska Akademia Nauk. Instytut Fizyki PAN
    Tematy:
    02.70.Dh-
    Opis:
    To date many fixation techniques of mandibular angle fractures have been introduced. There exist much research on the stability of plate and screws systems used in Champy technique in fixation of mandibular fractures. However the need of a second surgery for the removal of these plates and screws, and well known disadvantages of metallic fixations have led to the development of resorbable materials. It is thought that in order to achieve a safe and effective post-operative stability, the use of resorbable plates and screws is preferred for fixation. In this study, fixation evaluation of biodegradable plates which have been commonly used in recent years, was investigated using finite element method. 3D model required to perform the finite element analysis was obtained from CT scanning images using reverse engineering methods and material properties of mandible were obtained by Hounsfield Unit method. Biodegradable fixation systems were applied to this model and FEA was performed. It is concluded that biodegradable plate screw system used in the treatment of mandibular angle fractures shows a sufficient stability under masticatory forces.
    Źródło:
    Acta Physica Polonica A; 2016, 129, 4; 883-885
    0587-4246
    1898-794X
    Pojawia się w:
    Acta Physica Polonica A
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Molecular prevalence and subtyping of Blastocystis sp. isolates in stray cats of İzmir, Turkey: First report of “ST4 allele 42” in cats
    Autorzy:
    Can, H.
    Köseoğlu, A.E.
    Erkunt Alak, S.
    Güvendi, M.
    Ün, C.
    Karakavuk, M.
    Değirmenci Döşkaya, A.
    Aykur, M.
    Aksoy Gökmen, A.
    Gürüz, A.Y.
    Döşkaya, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/2087180.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Blastocystis sp.
    subtyping
    ST4
    allele 42
    stray cats
    Źródło:
    Polish Journal of Veterinary Sciences; 2021, 24, 2; 217-223
    1505-1773
    Pojawia się w:
    Polish Journal of Veterinary Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
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