Effect of vacuum annealing conditions on certain physicochemical properties of 08kp steel

1972 ◽  
Vol 6 (1) ◽  
pp. 97-100
Author(s):  
E. I. Litvinova ◽  
E. P. Novakovskaya
Keyword(s):  
Physicochemical Properties ◽  
Vacuum Annealing ◽  
08Kp Steel ◽  
Annealing Conditions

SYNTHESIS OF COMPOSITES BASED ON SILICON-MODIFIED DETONATION NANODIAMONDS

1970 ◽  
Vol 61 (11) ◽  
Author(s):  
Vladimir T. Senyut ◽  
Petr A. Vityaz ◽  
Igor V. Val’kovich ◽  
Alexander M. Parnitsky ◽  
Vladimir A. Rzhetsky
Keyword(s):  
Pressure Range ◽  
Vacuum Annealing ◽  
Nanocrystalline Structure ◽  
Polycrystalline Diamond ◽  
Adsorbed Water ◽  
Surface Functional Groups ◽  
Reducing Atmosphere ◽  
Annealing Conditions ◽  
The Hierarchical Structure ◽  
20 Nm

Scientific approaches to the formation of composite materials such as «nanodiamond-nanostructured SiC» have been developed. It is shown that, as a result of vacuum heat treatment, nanodiamonds are graphitized and nanostructured graphite-like coating forms on their surface. In this case, the reduction in the mass of the nanodiamond powder after vacuum annealing reaches 20 – 30 wt. % by removing oxygen-containing surface functional groups, physically and chemically adsorbed water. In accordance with the developed technology chemical-thermal modifying of nanodiamonds by silicon is carried out by annealing in a reducing atmosphere in the temperature range of 873–1273 К in the presence of silicon halides. On the basis of carbon and silicon modified nanodiamonds under vacuum annealing conditions a composite nanostructured powder of nanodiamond-SiC with particles of size from 0.1 to 5 μm is obtained. As a result of thermobaric sintering of the modified powder in the pressure range of 1.0 – 2.5 GPa, a compact diamond composite material consisting of polycrystalline diamond grains of 0.2 – 0.5 μm in size is formed. The size of diamond subgrains is 50 – 100 nm, and the presence of nanodiamonds measuring 10 – 20 nm is noted between large polycrystalline grains. As a result of grinding of the synthesized compacts, a polycrystalline diamond micropowder with particles of size up to 50 μm, characterized by submicron- and nanocrystalline structure is obtained. Due to the hierarchical structure of the sintered particles (particle-grain-subgrain-nanodiamond crystallite), powders based on the obtained material are promising in finishing technologies for brittle nonmetallic materials.

scholarly journals Influence of vacuum annealing conditions on the surface oxidation and vacancy condensation in the surface of an FeAl single crystal

2010 ◽  
Vol 18 (4) ◽  
pp. 412-416 ◽  
Author(s):  
A. Yamauchi ◽  
M. Tsunekane ◽  
Kazuya Kurokawa ◽  
Shuji Hanada ◽  
Kyosuke Yoshimi
Keyword(s):  
Single Crystal ◽  
Vacuum Annealing ◽  
Surface Oxidation ◽  
Annealing Conditions

Formation of Periodic Steps on 6H-SiC (0001) Surface by Annealing in a High Vacuum

2011 ◽  
Vol 679-680 ◽  
pp. 437-440 ◽  
Author(s):  
Sergey P. Lebedev ◽  
V.N. Petrov ◽  
I.S. Kotousova ◽  
A.A. Lavrent’ev ◽  
P.A. Dement’ev ◽  
...  
Keyword(s):  
Flat Surface ◽  
Vacuum Annealing ◽  
High Vacuum ◽  
Auger Spectroscopy ◽  
Residual Pressure ◽  
Force Microscopy ◽  
Cell Height ◽  
Annealing Conditions ◽  
Atomic Force ◽  
Atomically Flat

Influence of high-vacuum annealing at temperatures in the range 1300-1400°C and residual pressure of ~10-6 Torr on the surface of 6H-SiC (0001) wafers has been studied. Auger spectroscopy and RHEED data show that the annealing conditions do not lead to any surface reconstruction of the wafers. Atomic force microscopy reveals atomically flat surface terraces separated by steps of unit-cell height (h = 1.5 nm).

Thermal Stability and Structural Reactions at the Tantalum /a-C Interface under Vacuum Annealing Conditions

1995 ◽  
pp. 265-270
Author(s):  
A. P. Novikov ◽  
E. A. Shilova ◽  
L. D. Buiko ◽  
V. A. Zaikov
Keyword(s):  
Thermal Stability ◽  
Vacuum Annealing ◽  
Annealing Conditions

Transformation of the electronic structure of the SnO2 − x /MWCNT nanocomposite under high-vacuum annealing conditions

2014 ◽  
Vol 56 (9) ◽  
pp. 1899-1903 ◽  
Author(s):  
V. V. Bolotov ◽  
S. N. Nesov ◽  
P. M. Korusenko ◽  
S. N. Povoroznyuk
Keyword(s):  
Electronic Structure ◽  
Vacuum Annealing ◽  
High Vacuum ◽  
Annealing Conditions

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.

Studies on the Degradation of Human Fibrinogen by Plasmin and Trypsin

1966 ◽  
Vol 16 (03/04) ◽  
pp. 526-540 ◽  
Author(s):  
E. A Beck ◽  
D. P Jackson
Keyword(s):  
Physicochemical Properties ◽  
Electrophoretic Mobility ◽  
Rapid Loss ◽  
Clotting System ◽  
Human Fibrinogen ◽  
Peptide Bonds ◽  
Physico Chemical ◽  
Starch Gel ◽  
Ph Stat ◽  
Rapid Appearance

SummaryThe effects of trypsin and plasmin on the functional and physicochemical properties of purified human fibrinogen were observed at various stages of proteolysis. Concentrations of plasmin and trypsin that produced fibrinogenolysis at comparable rates as measured in a pH stat produced, at similar rates, loss of precipitability of fibrinogen by heat and ammonium sulphate and alterations in electrophoretic mobility on starch gel. Trypsin produced a more rapid loss of clottability of fibrinogen and a more rapid appearance of inhibitors of the thrombin-fibrinogen clotting system than did plasmin. Consistent differences were noted between the effects of trypsin and plasmin on the immunoelectrophoretic properties of fibrinogen during the early stages of proteolysis.These results are consistent with the hypothesis that trypsin initially reacts with the same peptide bonds of fibrinogen that are split by thrombin, but these same bonds do not appear to be split initially by plasmin. Measurement of the various functional and physico-chemical changes produced by the action of trypsin and plasmin on fibrinogen can be used to recognize various stages of proteolysis.

Ruthenium(II) Complexes of 1H-Imidazo[4,5-f][1,10]Phenanthroline Derivatives: Physicochemical Properties and Photosensitizing Ability

INEOS OPEN ◽  
2020 ◽  
Vol 3 ◽  
Author(s):  
S. D. Tokarev ◽  
◽  
Yu. V. Fedorov ◽  
Keyword(s):  
Physicochemical Properties

The effectiveness of granular chalk use for growing winter wheat on grey forest soil

2020 ◽  
pp. 181-191
Author(s):  
M. Tkachenko ◽  
N. Borys ◽  
Ye. Kovalenko
Keyword(s):  
Winter Wheat ◽  
Physicochemical Properties ◽  
Forest Soil ◽  
Active Substance ◽  
Mass Fraction ◽  
Gray Forest Soil ◽  
Mineral Fertilizers ◽  
Acidic Soils ◽  
Grey Forest Soil

The research aims to establish the eff ectiveness of granular chalk use produced by «Slavuta-Calcium» Ltd. under growing Poliska–90 winter wheat variety, changing the physicochemical properties of grey forest soil and the wheat productivity. It also aims to establish optimal dosis of «Slavuta-Calcium» granular chalk as the meliorant and mineral fertilizer for grey forest soil in the system of winter wheat fertilization. In the temporary fi eld studies, various doses of nutrients N60–90–120P30–45–60K60–90–120 combined with «Slavuta–Calcium» granular chalk in a dose of Ca230–460–690 kg/ha of the active substance were studied against the background of secondary plowing of rotation products – soybean biomass that averaged 2.34 t/ha. Granular chalk is a modern complex highly eff ective meliorant with the content of Ca – 37.7 and Mg – 0.2 %, the mass fraction of carbonates (CaCO3 + MgCO3) makes at least 95 %. It is characterized by a high level of solubility when interacting with moisture in soil. It has a form of white granules, the mass fraction of 4.0–6.0 mm in size granules makes not less than 90 % and the one of 1.0 mm in size makes less than 5 %. Reactivity – 97 %. The granular chalk is advisable to apply on acidic soils, as a highly concentrated calcium-magnesium fertilizer, with the former as the dominant fertilizer, to optimize the physicochemical properties of the soil, as well as the plant nutrition system, in particular, increasing the availability of an element for assimilation by plants and as long-term ameliorants. The eff ectiveness of the use of mineral fertilizers, in particular acidic nitrogen on highly and medium acidic soils, after chemical reclamation is increased by 30–50 %, and slightly acidic by 15–20 %. The increase in productivity of crops from the combined eff ects of nutrients and chalk granulated is usually higher than when separately applied. The eff ectiveness of the integrated action of these elements is manifested in the growth of plant productivity and the quality of the resulting products, as well as the optimization of physical chemical properties and soil buff ering in the long term. In order to optimize the physicochemical properties of the arable layer of gray forest soil and the productive nutrition of agricultural crops, winter wheat, in particular, biogenic elements should be used in doses N60-90-120P30-45- 60K60-90-120 with granulated chalk «Slavuta-Calcium» in doses of Ca230-460-690 kg/ha of active substance. Granulated chalk obtained as a result of industrial grinding of solid sedimentary carbonate rocks of natural origin, subsequently under the infl uence of the granulation process of the starting material contains Ca and Mg carbonates of at least 95 %, dense granules which facilitates convenient mechanized application, as well as chalk suitable for accurate metered application on the quest map. Key words: granular chalk, gray forest soil, chemical reclamation, crop productivity.

Characteristics Of The Structure Formation Of Gypsum Binder Modified With Zinc Hydrosilicates

2020 ◽  
pp. 40-46
Keyword(s):  
Synergistic Effect ◽  
Physicochemical Properties ◽  
Structure Formation ◽  
Silicic Acid ◽  
Chemical Properties ◽  
Crystal Formation ◽  
Ability To Act ◽  
Chemical Factors ◽  
Sorption Characteristics

The authors' methodic for assessing the role of chemical and physic-chemical factors during the structure formation of gypsum stone is presented in the article. The methodic is also makes it possible to reveal the synergistic effect and to determine the ranges of variation of controls factors that ensure maximum values of such effect. The effect of a micro-sized modifier based on zinc hydro-silicates on the structure formation of building gypsum is analyzed and corresponding dependencies are found. It is shown that effects of influence of modifier on the properties of gypsum compositions are determined by chemical properties of modifier. Among the mentioned properties are sorption characteristics (which depend on the amount of silicic acid and its state) and physicochemical properties - the ability to act as a substrate during crystal formation. The proposed method can also be extended to other binding substances and materials. This article contributes to the understanding of the processes that occur during the structure formation of composites, which will make it possible to control the structure formation in the future, obtaining materials with a given set of properties.

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