منابع مشابه
Graphite Whiskers Discovered in Cv 3 Meteorites .
Introduction: We report the serendipitous discovery of a small number of graphite whiskers (GWs), a rare polymorph of carbon, in a range of settings within several CV3 meteorites [1]. Currently accepted growth conditions for GWs indicate that this unusual phase requires that the parent mineralogy experienced high temperature processing in contact with a carbon-containing gas. Description of Gra...
متن کاملApparent magnitudes of high redshift Type 1a supernovae and intergalactic graphite whiskers
The concept of a Universe undergoing an acceleration in its expansion rate and predicating the existence of dark energy is based on observed deficits in brightness of Type 1a supernovae at high redshifts, amounting to m ∼ 0.3–0.5. We show that the effect of intergalactic graphite whiskers of radii in the general range 0.03–0.07 μm and lengths in excess of ∼5 μm will be to mimic the effects of d...
متن کاملINFLUENCE OF Al AND Ti ON MICROSTRUCTURE AND QUALITY OF COMPACTED GRAPHITE IRON CASTINGS
Compacted graphite cast iron is a material that again comes forward of the interest of designers and foundries acquiring or improving manufacture of castings from that material. From many publications let us quote three of them from last year 1, 2, 3 . According to the European standard ISO 16 112 this material is called „compacted (vermicular) graphite cast iron“ (the abbreviation CGI that wil...
متن کاملAnisotropic etching of SiC whiskers.
We have demonstrated a method of producing nanoplatelets or complex well-ordered nanostructures from silicon carbide (SiC) whiskers. Preferential etching of SiC whiskers in a mixture of hydrofluoric and nitric acids (3:1 ratio) at 100 degrees C results in the selective removal of cubic SiC and the formation of complex structures resembling a pagoda architecture. Possible mechanisms governing se...
متن کاملStudy of Graphite Content and Sintering Temperature on Microstructure Properties of Iron-Based Powder Preform
In this present work effect of temperature and graphite contents on the microstructural and mechanical properties of iron based powder metallurgy freeform was studied. The different graphite contents (0%, 2%, 5% and 10%) were mixed in iron powder and compact them in 100 KN. These specimens were sintered at 7000 C, 8500 C and 10000 C in muffle furnaces. Microstructural properties were evaluated ...
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ژورنال
عنوان ژورنال: TANSO
سال: 1974
ISSN: 1884-5495,0371-5345
DOI: 10.7209/tanso.1974.26