scholarly journals Indium-containing metal-carbon composites from volcano-fumarole mineralization of Great fissure Tolbachik eruption

2021 ◽  
Vol 6 ◽  
pp. 28-37
Author(s):  
V. I. Silaev ◽  
◽  
L. P. Vergasova ◽  
V. N. Filippov ◽  
A. F. Khazov ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Chemical Composition ◽  
Internal Structure ◽  
Type A ◽  
Indium Content ◽  
Carbon Composites ◽  
Eutectic Type ◽  
Metal Component ◽  
Carbon Impurities ◽  
Promising Type

The results of studies of metal-carbon composites, unique in composition and origin, in which the metal component is a tin-aluminum alloy with an admixture of In, Cu, Fe, Cr, Se, are discussed. The morphology and internal structure of particles, variations in the chemical composition, and the isotopic of carbon impurities are analyzed. Based on the diagram of the eutectic type, a conclusion was made about the crystallization of alloys in the temperature range 650—150 °С. The question of the indium content of volcanic products in Kamchatka as a new and possibly industrially promising type of phase-diverse indium mineralization is discussed.

scholarly journals Quantification of Carbonic Contamination of Fused Silica Surfaces at Different Stages of Classical Optics Manufacturing

Materials ◽  
2021 ◽  
Vol 14 (7) ◽  
pp. 1620
Author(s):  
Robert Köhler ◽  
Domenico Hellrung ◽  
Daniel Tasche ◽  
Christoph Gerhard
Keyword(s):  
Chemical Composition ◽  
Photoelectron Spectroscopy ◽  
Decisive Role ◽  
Fused Silica ◽  
Process Step ◽  
Carbon Contamination ◽  
Silica Surfaces ◽  
Carbon Impurities ◽  
High Level ◽  
Glass Surfaces

The chemical composition of ground and polished fused silica glass surfaces plays a decisive role in different applications of optics. In particular, a high level of carbon impurities is often undesirable for further processing and especially for gluing or cementing where adhesion failure may be attributed to carbonic surface-adherent contaminants. In this study, the surface carbon content at different stages of classical optics manufacturing was thus investigated. Two different standard processes—grinding and lapping with two final polishing processes using both polyurethane and pitch pads—were considered. After each process step, the chemical composition and roughness of the surface were analysed using X-ray photoelectron spectroscopy and atomic force microscopy. An obvious correlation between surface roughness and effective surface area, respectively, and the proportion of carbon contamination was observed. The lowest carbon contamination was found in case of lapped and pitch polished surfaces.

Differences in Chemical Composition and Internal Structure Influence Systemic Host Response to Implants of Biomaterials

2011 ◽  
Vol 34 (5) ◽  
pp. 422-431 ◽  
Author(s):  
Silvia Scaglione ◽  
Michele Cilli ◽  
Mauro Fiorini ◽  
Rodolfo Quarto ◽  
Giuseppina Pennesi
Keyword(s):  
Chemical Composition ◽  
Internal Structure ◽  
Host Response

scholarly journals PROPERTIES OF CONCRETE USING BLAST-FURNACE SLAG CEMENT TYPE A WITH MODIFIED CHEMICAL COMPOSITION

2010 ◽  
Vol 64 (1) ◽  
pp. 244-250 ◽  
Author(s):  
Shingo MIYAZAWA ◽  
Takashi YOKOMURO ◽  
Hiromi FUJIWARA ◽  
Kiyoshi KOIBUCHI
Keyword(s):  
Blast Furnace ◽  
Chemical Composition ◽  
Blast Furnace Slag ◽  
Type A ◽  
Cement Type ◽  
Slag Cement ◽  
Furnace Slag

scholarly journals Measurement of high-temperature strains in superalloy and carbon/carbon composites using chemical composition gratings

Strain ◽  
2016 ◽  
Vol 53 (1) ◽  
pp. e12218
Author(s):  
Weihua Xie ◽  
Songhe Meng ◽  
Hua Jin ◽  
Chong Du ◽  
Shiyu Huo ◽  
...  
Keyword(s):  
High Temperature ◽  
Chemical Composition ◽  
Carbon Composites

The Effect of Thermal Treatment on the Microstructural Evolution of an Al-Cu Alloy

2003 ◽  
Author(s):  
Tracie L. Zoeller ◽  
Thomas H. Sanders
Keyword(s):  
Aluminum Alloy ◽  
Chemical Composition ◽  
Marked Effect ◽  
Volume Fraction ◽  
Solidification Rate ◽  
Thermal Treatments ◽  
Large Volume Fraction ◽  
Cu Alloy ◽  
Processing Step ◽  
Alloy Microstructure

Following solidification, an aluminum alloy microstructure is highly segregated. The microstructure consists of cored dendrites with various soluble and insoluble phases present in the dendritic regions. The solidification rate has a marked effect on the amount of coring that an alloy experiences. Understanding the effects of the solidification rate is important in explaining differences in microstructures. Subsequent heat treatments are performed to homogenize the microstructure. The microstructure evolution after each processing step is dependent upon the previous microstructures. The variation in local chemical composition may promote or hinder precipitation of new phases. A large volume fraction of coarse insoluble phases can lead to the occurrence of recrystallized grains via particle stimulated nucleation, while inhomogeneous solute distribution can lead to the precipitation of an uneven distribution of dispersoid phases. The effect of solidification rate and subsequent thermal treatments on the microstructure of an Al-4Cu alloy will be investigated and experimental and numerical results will be presented.

Influence of Continuous Casting Conditions on Segregation of Additions in EN AW 1350 Aluminum Alloy

2016 ◽  
Vol 682 ◽  
pp. 205-211
Author(s):  
Radosław Kowal ◽  
Tadeusz Knych ◽  
Andrzej Mamala ◽  
Paweł Kwaśniewski ◽  
Wojciech Ściężor ◽  
...  
Keyword(s):  
Aluminum Alloy ◽  
Chemical Composition ◽  
Continuous Casting ◽  
Production Process ◽  
Casting Speed ◽  
Casting Process ◽  
Point Of View ◽  
Crystallization Zone ◽  
Spectroscopy Studies

Integrated continuous casting processes are an important element of the production process in modern industry. Requirements for quality and exploitation properties of products obtained using continuous casting processes necessitate a revision of the role of impurities distribution in the material. This paper concerns on the influence of the casting process on the distribution of alloy additions. Spectroscopy studies were performed for the most sensitive elements, from the segregation, (i.e. : iron and silicon) point of view. Next obtained research results were correlated with the parameters of chemical composition such as casting speed, the presence of a modifier and the processing of metal crystallization zone. Analysis of the results clearly shows the presence of iron and silicon normal macrosegregation. It was observed that the concentration of these elements is highest in the casting axis and, in the case of iron, is 50% higher in the axis than in the circumference of casts.

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