Characterization of carbon nanofibers/ ZrO₂ ceramic matrix composite

• Autorzy: Duszová A , Morgiel J. , Bastl Z. , Mihály J , Dusza J.

Warianty tytułu

PL

Charakterystyka kompozytu o osnowie ceramicznej modyfikowanej włóknami węglowymi

• Języki publikacji: EN

Abstrakty

EN

Carbon micro/nanofibers prepared by catalytic chemical vapor deposition have been characterized in the form of powders and in the form of filaments, intercorporated in the matrix of ZrO₂. Scanning electron microscopy, transmission electron microscopy, high resolution electron microscopy, electron spectroscopy for chemical analysis and Raman spectroscopy have been used. The outer diameter of the fibers varied from 50 nm to 600 nm with an average diameter of 120 nm, length from several micrometers to several tens of micrometers and inner diameters from 20 nm to 230 nm. Two types of fibers have been identified; cylindrical which consists of a distinct graphite layers parallel to the fiber axes and bamboo - shaped fibers with walls which are built from domains with different orientations of graphite layers. The fibers contain 99.05 at.% carbon and 0.95 at.% oxygen with a binding energy of O (1s) electrons of 532.7 e V which corresponds to carbon in C-O bonds. In the first-order Raman spectra, the position of the band G was found at 1600 cm-1 and D at 1282 cm-1. The CNFs in ZrO₂+ CNFs composite have been relatively well dispersed, however clusters of CNFs together with porosity are present as a result of the difficulty of dispersing, too. TEM and HREM revealed that the CNFs are usually located at the grain boundaries of ZrO₂ in the form of undamaged nanofibers or disordered graphite.

PL

Włókna węglowe przygotowane metodą osadzania z par (tzw. Chemical Vapour Deposition), były badane bezpośrednio po wytworzeniu oraz po wprowadzeniu do osnowy ceramicznej metodami elektronowej mikroskopii skaningowej, transmisyjnej oraz spektroskopii ramanowskiej. Średnica włókien wahała się pomiędzy 50 nm, a 600 nm przy sredniej wartości ok.120 nm, podczas gdy ich długość wynosiła od kilku do kilkudziesięciu mikrometrów. Identyfikowano dwa rodzaje budowy włókien, tj. cylindryczne oraz z wewnętrznymi przekładkami typu „łodygi bambusa“. Włókna węglowe zawierały do 0.95 at. % tlenu o energi wiazania O (1s) ok.532.7 e V, co odpowiada wiązaniu C-O. Na pierwszym widmie Ramana pasmo G identyfikowano dla 1600 cm-1, a pasmo D dla 1282 cm-1. Badania kompozytu wykazałay równomierny rozkład włókien w ceramicznej osnowie. W sąsiedztwie większych aglomeratów stwierdzono tendencje do występowania pustek. W czasie spiekania przeważająca część włókien zachowała swoją rurkową strukturę, natomiast pozostały materiał węglowy uległ przemianie do słabo uprządkowanych struktur grafitu lub nawet uległ amorfizacji.

Słowa kluczowe

EN

carbon nanofibers; nanocomposites; transmission electron microscopy; high resolution transmission electron microscopy; Raman spectroscopy

PL

włókna węglowe; nanokompozyty; transmisyjny mikroskop elektronowy; mikroskopia skaningowa elektronowa; spektroskopia Ramana

• Wydawca: Institute of Metallurgy and Materials Science of Polish Academy of Sciences ; Committee of Materials Engineering and Metallurgy of Polish Academy of Sciences
• Czasopismo: Archives of Metallurgy and Materials
• Rocznik: 2013
• Tom: Vol. 58, iss. 2
• Strony: 459--463
• Opis fizyczny: Bibliogr. 25 poz., rys.

Twórcy

autor

Duszová A

• Institute of Materials Research, Slovak Academy of Sciences, Watsonova 47, 040 01 Kosice, Slovakia

autor

Morgiel J.

• Institute of Metallurgy and Materials Science, Polish Academy of Sciences, Reymonta 25, 30-059 Kraków, Poland

autor

Bastl Z.

• J. Heyrovsky Institute of Physical Chemistry, Academy of Sciences of the Czech Republic, Dolejskova 3, 182 23 Praque 8, Czech Republic

autor

Mihály J

• Chemical Research Center, Hungarian Academy of Sciences, H-1025 Pusztaszeri UT 59-67 Budapest, Hungary

autor

Dusza J.

• Obuda University, Donat Banki Faculty of Mechanical and Safety Engineering, Nepszinhaz Street 8, 1428 Budapest, Hungary

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