Ultrasonic comminution of refractory compound powders

1971 ◽  
Vol 10 (12) ◽  
pp. 948-952
Author(s):  
V. E. Matsera ◽  
V. S. Pugin ◽  
A. G. Dobrovol'skii ◽  
Yu. I. Nikitin ◽  
B. V. Pogorelyi ◽  
...  
Keyword(s):  
Refractory Compound

Production of refractory compound granules

1975 ◽  
Vol 14 (3) ◽  
pp. 188-192
Author(s):  
A. E. Gorbunov ◽  
Yu. A. Otradinskii ◽  
V. S. Matveeva ◽  
F. G. Sevost'yanova
Keyword(s):  
Refractory Compound

Quality of the refractory compound for the iron notch of blast furnaces

Refractories ◽  
1977 ◽  
Vol 18 (7-8) ◽  
pp. 467-469
Author(s):  
V. A. Kostrov ◽  
V. I. Solodkov
Keyword(s):  
Refractory Compound ◽  
Blast Furnaces ◽  
Iron Notch

scholarly journals Corrosion Behavior of Pure Cr, Ni, and Fe Exposed to Molten Salts at High Temperature

2014 ◽  
Vol 2014 ◽  
pp. 1-12 ◽  
Author(s):  
O. Sotelo-Mazón ◽  
C. Cuevas-Arteaga ◽  
J. Porcayo-Calderón ◽  
V.M. Salinas Bravo ◽  
G. Izquierdo-Montalvo
Keyword(s):  
Corrosion Resistance ◽  
Molten Salt ◽  
Molten Salts ◽  
Refractory Compound ◽  
Open Circuit Potential ◽  
Passive Layer ◽  
Open Circuit ◽  
Metallic Surface ◽  
Weight Loss Method ◽  
Loss Method

Corrosion resistance of pure Fe, Cr, and Ni materials exposed in NaVO3molten salt at 700°C was evaluated in static air during 100 hours. The corrosion resistance was determined using potentiodynamic polarization, open circuit potential, and lineal polarization resistance. The conventional weight loss method (WLM) was also used during 100 hours. The electrochemical results showed that Fe and Cr have a poor corrosion resistance, whereas pure Ni showed the best corrosion performance, which was supported by the passive layer of NiO formed on the metallic surface and the formation of Ni3V2O8during the corrosion processes, which is a refractory compound with a higher melting point than that of NaVO3, which reduces the corrosivity of the molten salt. Also, the behavior of these materials was associated with the way in which their corresponding oxides were dissolved together with their type of corrosion attack. Through this study, it was confirmed that when materials suffer corrosion by a localized processes such as pitting, the WLM is not reliable, since a certain amount of corrosion products can be kept inside the pits. The corroded samples were analyzed through scanning electron microscopy.

Industrial operation of vacuum aluminum evaporators made in refractory compound alloys

1976 ◽  
Vol 15 (1) ◽  
pp. 34-39
Author(s):  
P. S. Kislyi ◽  
M. A. Kuzenkova ◽  
L. I. Struk ◽  
S. A. Shvab ◽  
M. S. Borovikova
Keyword(s):  
Refractory Compound ◽  
Industrial Operation ◽  
Made In

More Powerful Peroxide Kjeldahl Digestion Method

1987 ◽  
Vol 70 (5) ◽  
pp. 783-787 ◽  
Author(s):  
Clifford C Hach ◽  
Brian K Bowden ◽  
Alan B Kopelove ◽  
Scott V Brayton
Keyword(s):  
Nicotinic Acid ◽  
Refractory Compound ◽  
Complete Recovery ◽  
Minimal Amount ◽  
Digestion Time ◽  
State Controller ◽  
Ammonia Recovery ◽  
Kjeldahl Digestion ◽  
Time Required ◽  
Kjeldahl Nitrogen

Abstract Enhanced ammonia recovery and a simplified method are described for a rapid Kjeldahl digestion using sulfuric acid and hydrogen peroxide as the sole digestion reagents. This micro procedure uses a Vigreux fractionating head fitted to a 100 mL volumetric flask and a hot plate with a solid-state controller. Continuous-flow peroxide addition is controlled by a capillary funnel, and fumes are evacuated through a side-arm vent leading to a water aspirator. Complete recovery of nitrogen from the refractory compound, nicotinic acid, is obtained with less than 10 min digestion. The described method reduces digestion time by 25-50% over the open-manifold peroxy method. A digestibility index (DI), scaled 0-10, establishes the difficulty of digestion for each sample and assigns values to compounds. A useful tool for determining the minimal amount of reagent and digestion time required, the DI assigns zero for compounds not needing digestion and 10 for nicotinic acid. Digested samples obtained from the described method are suitable for direct colorimetric analysis of many elements in addition to Kjeldahl nitrogen. Distillation of the digested sample is not required

ChemInform Abstract: MgB2C2, a New Graphite-Related Refractory Compound.

ChemInform ◽  
2010 ◽  
Vol 26 (15) ◽  
pp. no-no
Author(s):  
M. WOERLE ◽  
R. NESPER
Keyword(s):  
Refractory Compound

Refractory compound based on low modulus water glass for ramming linings of arc melting furnaces

Refractories ◽  
1982 ◽  
Vol 23 (1-2) ◽  
pp. 66-67
Author(s):  
V. M. Soifer ◽  
O. B. Grishchenko ◽  
V. S. Kozlova ◽  
N. I. Mosolova ◽  
V. N. Abakumova
Keyword(s):  
Water Glass ◽  
Refractory Compound ◽  
Arc Melting ◽  
Low Modulus
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