Results 111 to 120 of about 31,354 (260)

Comparison of isothermal and cyclic oxidation behavior of twenty-five commercial sheet alloys at 1150 C [PDF]

The cyclic and isothermal oxidation resistance of 25 high-temperature Ni-, Co-, and Fe-base sheet alloys after 100 hours in air at 1150 C was compared.
Barrett, C. A., Lowell, C. E.
core   +1 more source

Origin of the ungrouped achondrite NWA 4518: mineralogy and geochemistry of FeNi-metal [PDF]

, 2011
Ungrouped achondrite NWA 4518 is an ultramafic breccia with abundant siderophile rich IIA-like metal. Its silicate chemistry is similar to that of WINs, HEDs, and silicate inclusions of IIE irons.
Franchi, I., Greenwood, R., Humayun, M., Ivanova, M. A., Lorenz, C. A., Teplyakova, S. N.   +5 more
core  

Geochemical behavior of chromium in minerals of high-Mg rocks, associated with granitoid massifs of the Urals

Литосфера, 2019
Research subject. High-magnesium rocks associated with the granitoid massifs of the Urals are represented by gabbro-diorites and their melanocratic varieties (hornblendites), as well as by diorites and quartz diorites.
S. V. Pribavkin, G. A. Кallistov, Т. A. Оsipova, I. A. Gottman, E. A. Zin’kova   +4 more
doaj   +1 more source

Improving the Quality of Ferruginous Chromite Concentrates Via Physical Separation Methods

Minerals, 2019
The low chromium-to-iron ratio of chromite ores is an important issue in some chromite deposits. The value of the chromite ore is indeed dictated in the market by its iron, as well as its chromium content. In the present study, a chromite concentrate was
S. K. Tripathy, Y. R. Murthy, Veerendra Singh, S. Farrokhpay, L. Filippov   +4 more
semanticscholar   +1 more source

Petrogenetic Implications for Ophiolite Ultramafic Bodies from Lokris and Beotia (Central Greece) Based on Chemistry of Their Cr-spinels

Geosciences, 2017
Cr-spinels from ultramafic rocks from Lokris (Megaplatanos and Tragana), and Beotia (Ypato and Alyki) ophiolitic occurrences were studied. These rocks comprise principally harzburgite with minor dunite. Small amounts of clinopyroxene-rich harzburgite and
Panagiotis Pomonis, Andreas Magganas
doaj   +1 more source

Lunar sample analysis [PDF]

Results are presented from an extensive series of new high resolution scanning electron microscope studies of the very primative group of meteorites known as unequilibrated chondrites.
Cirlin, E. H., Housley, R. M., Rajan, R. S., Rambaldi, E. R., Want, D.   +4 more
core   +1 more source

The Diderot meteorite: The second chassignite [PDF]

, 2005
The Diderot meteorite is a dunite discovered in Sahara.
Barrat, J-A., Beck, P., Bohn, M., Cotten, J., Franchi, I.A., Gillet, Ph., Greenwood, R.C., Reynard, B., Van de Moortele, B.   +8 more
core  

Fine-Scale Variations in Eucritic Pyroxene FeO/MnO: Process vs. Provenance. [PDF]

, 2018
Most asteroidal igneous rocks are eucrite-like basalts and gabbros, composed mostly of ferroan low- and high-Ca pyroxenes and calcic plagioclase, plus smaller amounts of silica (most commonly tridymite), ilmenite, chromite, troilite, Ca-phosphate, metal ...
Barrett, T. J., Berger, E. L., Le, L, Mittlefehldt, D. W., Peng, Z. X., Ross, D. K   +5 more
core  

Study to establish cost projections for production of Redox chemicals [PDF]

A cost study of four proposed manufacturing processes for redox chemicals for the NASA REDOX Energy Storage System yielded favorable selling prices in the range $0.99 to $1.91/kg of chromic chloride, anhydrous basis, including ferrous chloride.
Greco, C. C., Rusinko, R. N., Wadsworth, A. L., III, Walther, J. F.   +3 more
core   +1 more source

Determination of Chromite by X-ray Fluorescence Spectrometry with Sample Preparation of a Lower-Dilution Fusion

Yankuang ceshi, 2013
Chromite analysis is dominated by chemical analysis, which is a wel-established but complicated procedure. Chromite can also be analysed by X-ray Fluorescence Spectrometry (XRF), however, a high-dilution fusion is not conducive to low content elements ...
ZENG Jiang-ping, WU Lei, LI Xiao-li, WANG Na, ZHANG Li-juan   +4 more
doaj