Purification of Graphite by Thermal Vacuum Treatment of Spent Potlining

2020 ◽  
pp. 1231-1236
Author(s):  
Kristin Sundby ◽  
Ulf Sjöström ◽  
Ellen Myrvold ◽  
Morten Isaksen
Keyword(s):  
Vacuum Treatment ◽  
Thermal Vacuum ◽  
Thermal Vacuum Treatment

scholarly journals Porosity Formation in Thin Welded Joints of Al–MG–LI Alloys

Materials ◽  
2022 ◽  
Vol 15 (1) ◽  
pp. 348
Author(s):  
Tatyana Olshanskaya ◽  
Elena Fedoseeva
Keyword(s):  
Phase Composition ◽  
Weld Metal ◽  
Fusion Zone ◽  
Residence Time ◽  
Welded Joints ◽  
Liquid State ◽  
Pore Formation ◽  
Vacuum Treatment ◽  
Thermal Vacuum ◽  
Thermal Vacuum Treatment

This work is about the study of the correlation of pore formation in welded joints of Al–MG–LI alloy with zirconium additives with the state of the base metal, thermal vacuum treatment, and welding technologies MIG and EBW. Metallographic analysis has been carried out, the phase composition of the alloy and weld metal has been investigated, and thermal cycles of welding have been calculated, allowing to estimate the residence time of metal in the alloying zone and weld metal in the liquid state. The nature of the allocation of strengthening fine-dispersed phases in the welded joints of the alloy has been determined. The regularity and character of pore formation in welded joints depending on the applicable thermal vacuum treatment (TVT) and welding technology have been revealed. It was established that TVT with subsequent hardening and aging has no effect on the phase composition of the alloy. However, this type of treatment contributes to the formation of a more homogeneous and uniform nature of the separation of fine-dispersed strengthening phases. It was revealed that the MIG technology (metal with and without TVT) is characterized by a large length of the fusion zone, the high residence time of metal in the fusion zone and weld metal in the liquid state, and the formation of pores. Phase formation in the temperature range of the beginning and end of the alloy crystallization occurs not only in the weld at the final stage of crystallization but also in the fusion zone, which may induce pore formation, whereas EBW welding shows the opposite trend and no pores. It was found that EBW technology prevents pore formation and makes it possible to obtain welded joints of 1420 Al alloys of the required quality.

Effect of a Thermal-Vacuum Treatment and X-Ray Radiation on the Morphology and Electrical Properties of Titanium Oxide Nanocoatings

2019 ◽  
Vol 92 (7) ◽  
pp. 883-892
Author(s):  
A. S. Kochetkova ◽  
E. A. Sosnov ◽  
A. A. Malkov ◽  
V. V. Antipov ◽  
N. A. Kulikov ◽  
...  
Keyword(s):  
Electrical Properties ◽  
Titanium Oxide ◽  
Vacuum Treatment ◽  
Thermal Vacuum ◽  
X Ray ◽  
Thermal Vacuum Treatment

Degradation of the reflectivity of white anodic-oxide coatings in thermal vacuum treatment

1997 ◽  
Vol 64 (5) ◽  
pp. 678-682 ◽  
Author(s):  
V. N. Kuznetsov ◽  
A. A. Lisachenko ◽  
I. V. Ivanova ◽  
V. A. Konnov
Keyword(s):  
Vacuum Treatment ◽  
Anodic Oxide ◽  
Oxide Coatings ◽  
Thermal Vacuum ◽  
Thermal Vacuum Treatment

Study of regularities for formation of diffusion coatings applied by vacuum chromoaluminizing

2020 ◽  
pp. 460-467
Author(s):  
V.P. Pankov ◽  
I.S. Arustamova ◽  
M.V. Stepanova ◽  
A.B. Fursina ◽  
M.M. Arutyunyan
Keyword(s):  
Diffusion Processes ◽  
Vacuum Treatment ◽  
Mass Gain ◽  
Particle Sizes ◽  
Diffusion Coatings ◽  
Coating Composition ◽  
Vacuum Method ◽  
Series Of Experiments ◽  
And Diffusion ◽  
Thermal Vacuum Treatment

Separate elements of vacuum chromoaluminizing technology, features in calculations of vapor elasticity of alloy components, estimation of the metals deposition rate to the substrate by the vacuum method, and diffusion processes occurring during the formation of coatings are considered. The dependences of specific mass gain, coating thickness and coating composition on the process are determined on the basis of series of experiments with different process durations. It is found that the particle sizes of the hardening γ′-phase depend on the modes of thermal vacuum treatment and the cooling rate after chromoaluminizing, and the latter determine the creep resistance of the alloy.

Thermal-vacuum testing of drilling and sampling tool

2000 ◽  
Author(s):  
M. Marchesi ◽  
R. Campaci ◽  
A. Nista ◽  
W. Prendin ◽  
S. Scarpa ◽  
...  
Keyword(s):  
Thermal Vacuum ◽  
Vacuum Testing

scholarly journals Density, hardness and strength properties of densified fir and aspen woods pretreated with water repellents

Holzforschung ◽  
2020 ◽  
Vol 0 (0) ◽  
Author(s):  
Hüseyin Pelit ◽  
Fatih Emiroglu
Keyword(s):  
Compression Ratio ◽  
Bending Strength ◽  
Linseed Oil ◽  
Vacuum Treatment ◽  
Strength Properties ◽  
Aspen Wood ◽  
Positive Effect ◽  
Water Repellents ◽  
Impregnated Wood ◽  
Compression Temperature

AbstractIn this study, the effect of thermo-mechanical densification on the density, hardness, compression strength, bending strength (MOR), and modulus of elasticity (MOE) of fir and aspen wood pretreated with water repellents was analyzed. Wood specimens were impregnated with paraffin, linseed oil and styrene after pre-vacuum treatment. Then, the impregnated wood specimens were densified with compression ratios of 20 and 40%, and at 120, 150 and 180 °C. The results indicated that the density, hardness and strength properties of the all densified specimens (untreated and impregnated) increased depending on the compression ratio and temperature. For all tested properties, higher increases were obtained in the paraffin and styrene pretreated specimens compared to untreated samples. However, the increase rates in linseed oil pretreated specimens were generally lower than untreated specimens. Regarding water repellents the most successful results in all tested properties were determined in styrene pretreated specimens. The density, hardness and strength properties of all specimens increased with the increase in compression ratio. On the other hand, the increase in the compression temperature negatively affects the properties of untreated and linseed oil pretreated specimens, while having a generally positive effect on the properties of paraffin pretreated specimens. However, all tested properties of styrene pretreated specimens have increased significantly due to the increase in compression temperature. The increasing strength properties of wood as a result of densification have increased much more with paraffin and especially styrene pretreatment. These combinations can be considered as an important potential for applications that require more hardness and strength.

scholarly journals An Active Gelatin Coating Containing Eugenol and Vacuum Delays the Decay of Chinese Seabass (Lateolabrax maculatus) Fillets during Cold Storage: A Microbiome Perspective

Coatings ◽  
2021 ◽  
Vol 11 (2) ◽  
pp. 147
Author(s):  
Xuan Ma ◽  
Qianqian Zhou ◽  
Weiqiang Qiu ◽  
Jun Mei ◽  
Jing Xie
Keyword(s):  
Microbial Diversity ◽  
High Throughput Sequencing ◽  
Vacuum Treatment ◽  
C Storage ◽  
Basic Nitrogen ◽  
Spoilage Bacteria ◽  
Lateolabrax Maculatus ◽  
Gelatin Coating ◽  
Microbial Enumeration ◽  
Growth And Reproduction

The purpose of this study was to evaluate the effect of an active gelatin coating containing eugenol and vacuum on the microbial diversity of Chinese seabass (Lateolabrax maculatus) during cold (−0.9 °C) storage. The bacterial sequences in Chinese seabass were observed using a high-throughput sequencing technique targeting the V3–V4 region of the 16S Ribosomal DNA (rDNA) on 0, 12th, and 24th day, which showed a more comprehensive estimate of the microbial diversity in seabass samples compared with microbial enumeration. The results revealed that the species diversity of fresh seabass was rich, mainly including Carnobacterium, Glutamicibacter, and Pseudomonas, with abundance ratios of 0.286, 0.160, and 0.130, respectively. Pseudomonas and Shewanella were the primary contaminants in the spoiled control samples, where the abundance ratios increased from 0.220 and 0.174 on the 12th day to 0.802 and 0.163 on the 24th day, respectively. Vacuum treatment could inhibit the growth of Pseudomonas and Shewanella such that when stored on the 12th day, Brochothrix became the superior genus. However, Pseudomonas and Shewanella dominated the storage until the 24th day, where their abundance ratios were 0.343 and 0.279, respectively. The inhibition of Pseudomonas and Carnobacterium was gradually enhanced with increasing concentrations of eugenol. Furthermore, an active gelatin coating containing eugenol and vacuum treatment was more effective at inhibiting the increase of the total volatile basic nitrogen. This study confirmed that an active gelatin coating containing eugenol and vacuum could reduce the species of bacteria, inhibit the growth and reproduction of the main dominant spoilage bacteria, and delay the spoilage of seabass.

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