Making and testing refractories from high-density, high-purity magnesite powder

Refractories ◽  
1980 ◽  
Vol 21 (5-6) ◽  
pp. 283-285
Author(s):  
V. G. Borisov ◽  
S. A. Stegantsev ◽  
G. G. Mel'nikova ◽  
E. P. Mezentsev ◽  
K. V. Simonov
Keyword(s):  
High Purity ◽  
High Density ◽  
Magnesite Powder

Effects of temperature and sliding velocity on the dry tribological characteristics of high purity, high density polycrystalline aluminium oxides

Wear ◽  
1992 ◽  
Vol 153 (2) ◽  
pp. 351-360 ◽  
Author(s):  
L. Esposito ◽  
A. Tucci ◽  
A.G. Solomah ◽  
C. Palmonari
Keyword(s):  
High Purity ◽  
High Density ◽  
Tribological Characteristics ◽  
Sliding Velocity ◽  
Effects Of Temperature

Preparation and sintering of high-density green bodies to high-purity silica glasses

1987 ◽  
Vol 89 (3) ◽  
pp. 334-344 ◽  
Author(s):  
R. Clasen
Keyword(s):  
High Purity ◽  
High Density ◽  
Silica Glasses

Sintering of high-density, high-purity alumina ceramics

1997 ◽  
Vol 23 (4) ◽  
pp. 323-328 ◽  
Author(s):  
A.R. Olszyna ◽  
P. Marchlewski ◽  
K.J. Kurzydłowski
Keyword(s):  
High Purity ◽  
High Density ◽  
Alumina Ceramics

Preparation and Characterisation of High Density, High Purity Lanthanum Aluminate Bulk Ceramics

2003 ◽  
Vol 10 (3) ◽  
pp. 193-202 ◽  
Author(s):  
R. Elsebrock ◽  
C. Makovicka ◽  
P. Meuffels ◽  
R. Waser
Keyword(s):  
High Purity ◽  
High Density ◽  
Lanthanum Aluminate

High-purity and high-density cubic phase of Li7La3Zr2O12 solid electrolytes by controlling surface/volume ratio and sintering pressure

2020 ◽  
Vol 359 ◽  
pp. 136965
Author(s):  
Yanhua Zhang ◽  
Dawei Luo ◽  
Wenjia Luo ◽  
Shibo Du ◽  
Yuxin Deng ◽  
...  
Keyword(s):  
High Purity ◽  
Solid Electrolytes ◽  
Volume Ratio ◽  
High Density ◽  
Cubic Phase

Direct Dissolution of Large-Size Ball-Type High-Density High-Purity α-Alumina by PTFE Pressure Bomb Method

2016 ◽  
Vol 37 (2) ◽  
pp. 262-265
Author(s):  
Jung Ki Suh ◽  
Chang Soo Kim ◽  
Myung Sub Han ◽  
Hwa Shim Lee
Keyword(s):  
High Purity ◽  
High Density ◽  
Large Size ◽  
Pressure Bomb ◽  
Direct Dissolution ◽  
Bomb Method

Predicting the Grain-Size Distributions in High-Density, High-Purity Alumina Ceramics

1989 ◽  
Vol 72 (1) ◽  
pp. 33-39 ◽  
Author(s):  
Kollengode S. Venkataraman ◽  
Robert A. DiMilia
Keyword(s):  
Grain Size ◽  
High Purity ◽  
High Density ◽  
Size Distributions ◽  
Alumina Ceramics ◽  
Grain Size Distributions

Observations oh Nucleation and Growth of Voids in Nickel

1970 ◽  
Vol 28 ◽  
pp. 414-415
Author(s):  
J. L. Brimhall ◽  
H. E. Kissinger ◽  
B. Mastel
Keyword(s):  
High Purity ◽  
Growth Stage ◽  
Elevated Temperatures ◽  
Early Growth ◽  
Nucleation And Growth ◽  
Pure Nickel ◽  
Different Temperatures ◽  
Total Fluence ◽  
Neutron Exposure ◽  
Growth Of Voids

Some information on the size and density of voids that develop in several high purity metals and alloys during irradiation with neutrons at elevated temperatures has been reported as a function of irradiation parameters. An area of particular interest is the nucleation and early growth stage of voids. It is the purpose of this paper to describe the microstructure in high purity nickel after irradiation to a very low but constant neutron exposure at three different temperatures.Annealed specimens of 99-997% pure nickel in the form of foils 75μ thick were irradiated in a capsule to a total fluence of 2.2 × 1019 n/cm2 (E > 1.0 MeV). The capsule consisted of three temperature zones maintained by heaters and monitored by thermocouples at 350, 400, and 450°C, respectively. The temperature was automatically dropped to 60°C while the reactor was down.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Planar defects in ordered (Ga,In)P

1988 ◽  
Vol 46 ◽  
pp. 902-903
Author(s):  
S. McKernan ◽  
C. B. Carter ◽  
D. Bour ◽  
J. R. Shealy
Keyword(s):  
Electron Diffraction ◽  
Vapor Phase ◽  
Growth Direction ◽  
High Density ◽  
Ordered Structure ◽  
Planar Defects ◽  
Diffraction Patterns ◽  
Ternary Semiconductors ◽  
Anion Species ◽  
Metallic Vapor

The growth of ternary III-V semiconductors by organo-metallic vapor phase epitaxy (OMVPE) is widely practiced. It has been generally assumed that the resulting structure is the same as that of the corresponding binary semiconductors, but with the two different cation or anion species randomly distributed on their appropriate sublattice sites. Recently several different ternary semiconductors including AlxGa1-xAs, Gaxln-1-xAs and Gaxln1-xP1-6 have been observed in ordered states. A common feature of these ordered compounds is that they contain a relatively high density of defects. This is evident in electron diffraction patterns from these materials where streaks, which are typically parallel to the growth direction, are associated with the extra reflections arising from the ordering. However, where the (Ga,ln)P epilayer is reasonably well ordered the streaking is extremely faint, and the intensity of the ordered spot at 1/2(111) is much greater than that at 1/2(111). In these cases it is possible to image relatively clearly many of the defects found in the ordered structure.

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