scholarly journals Morphology and Chemical Composition of Silicon Carbide Surface in Interaction with Titanium Alloy under Micro-Scratching Conditions

2020 ◽  
Vol 329 ◽  
pp. 02010
Author(s):  
Vladimir Nosenko ◽  
Aleksandr Fetisov ◽  
Sergey Nosenko ◽  
Valeria Puzyrkova
Keyword(s):  
Silicon Carbide ◽  
Titanium Alloy ◽  
Chemical Composition ◽  
Path Length ◽  
Chemical Elements ◽  
Cooling Process ◽  
Corundum Crystal ◽  
Initial Shape ◽  
X Ray ◽  
Cutting Path

The article describes features of the wear site morphology formation during micro-scratching of a titanium alloy by a silicon carbide crystal in comparison with a corundum crystal. The initial shape of the crystal top and the rate of micro-scratching were assumed to be constant. No lubricating or cooling process media were used. External factors: micro-scratch depth and cutting path length. The chemical composition of wear sites was studied using micro-x-ray spectral analysis. The content of chemical elements in the surface layer of silicon carbide and adhered metal was studied at separate points and by area scanning. The accelerating voltage of the excitation electrons was changed in the range from 5 to 20 kV. The concentration of chemical elements on the surface of the wear site was determined immediately after micro-scratching and after removing the adhered metal by etching. The regularities of changes in the concentration of chemical elements depending on the accelerating voltage of the excitation electrons were determined.

Transfer of Abrasive Material at Grinding a Titanium Alloy with a Wheel of Cubic Boron Nitride

2021 ◽  
Vol 316 ◽  
pp. 521-526
Author(s):  
Vladimir A. Nosenko ◽  
Alexander V. Fetisov ◽  
Semen P. Kuznetsov
Keyword(s):  
Titanium Alloy ◽  
Chemical Composition ◽  
Boron Nitride ◽  
Chemical Elements ◽  
Cubic Boron Nitride ◽  
Water Soluble ◽  
Alloy Surface ◽  
Ceramic Bond ◽  
Abrasive Tools ◽  
Wear Products

The article summarizes the results of the of the titanium alloy surface morphology and chemical composition study after grinding with a wheel of cubic boron nitride on a ceramic bond. The titanium alloy was treated using the method of cut-in grinding in the finishing mode using a synthetic water-soluble lubricant-cooling liquid that does not contain mineral oil. The research was carried out using the FEI Versa 3D LoVac electron microscope. Digital photos of the titanium alloy surface at different magnifications are given. Individual objects’ morphology allows us to identify them as wear products of abrasive tools. The chemical composition of the selected objects was studied by local x-ray spectral analysis. CBN crystals are partially or completely pressed into the treated surface and covered with a layer of the treated material. On the surface of CBN crystals, there are chemical elements that are part of the abrasive tool bond.

scholarly journals FEATURES OF DENTINE CHEMICAL COMPOSITION OF INTACT TEETH AND TEETH WITH WEDGE-SHAPED DEFECTS

2021 ◽  
Vol 74 (8) ◽  
pp. 1869-1875
Author(s):  
Svitlana P. Yarova ◽  
Iryna I. Zabolotna ◽  
Olena S. Genzytska ◽  
Andrii A. Komlev
Keyword(s):  
Chemical Composition ◽  
Chemical Elements ◽  
Cervical Region ◽  
Cervical Lesions ◽  
X Ray ◽  
Sodium Magnesium ◽  
Calcium Phosphorus ◽  
Cervical Area ◽  
Focused Beam

The aim: Is to define dentine chemical composition of intact teeth and those with wedge-shaped defects followed by the analysis of revealed differences. Materials and methods: Longitudinal sections of 22 clinically removed teeth (12 – clinically intact ones, 10 – with wedge-shaped defects) from both jaws were studied in patients aged between 25-54 years. JSM-6490 LV focused beam electron microscope (scanning) with system of energy-dispersive X-ray microanalysis INCA Penta FETх3 was used. The chemical composition of 148 dentine areas in the incisal region (tubercle), equator, cervical area has been determined as a percentage of the weight amounts of carbon, oxygen, calcium, phosphorus, sodium, magnesium, sulfur, chlorine, zinc, potassium, aluminum. Results: Dentine chemical composition of teeth with wedge-shaped defects differed from those of intact teeth by significantly lower content: sodium, chlorine and calcium – in the incisal region (tubercle); sodium, magnesium − at the equator; sodium, chlorine and calcium – in the cervical region (p≤0.05). In the sample groups with cervical pathology there was more sulfur and oxygen in the incisal region (tubercle), phosphorus and zinc – at the equator, carbon and potassium – in the cervical region (p≤0.05). Conclusions: Differences in the chemical composition of intact teeth and teeth with wedge-shaped defects, the presence of correlation between the studied chemical elements confirm the role of macro- and microelements in the pathogenesis of non-carious cervical lesions.

Morphology and Chemical Composition of Silicon Carbide Surfaces Interacting with Iron, Cobalt, and Nickel in Microscratching

2018 ◽  
Vol 284 ◽  
pp. 363-368 ◽  
Author(s):  
V.A. Nosenko ◽  
A.V. Fetisov ◽  
V.Ye. Puzyrkova
Keyword(s):  
Silicon Carbide ◽  
Electron Microscope ◽  
Chemical Composition ◽  
Iron Cobalt ◽  
Beam Electron ◽  
X Ray ◽  
Metal Atoms ◽  
Dual Beam ◽  
Structure Of Metal ◽  
Cobalt And Nickel

The paper dwells upon the specifics of worn spots being formed on a silicon-carbide crystal in microscratching of iron, cobalt, and nickel. Analysis was done using a Versa 3D dual-beam electron microscope. The chemical composition of worn spots was studied by local X-ray microanalysis. It was found out that the amount of metal transferred to the silicon-carbide worn spot was associated with the electron structure of metal atoms.

scholarly journals Morphology and chemical composition of titanium alloy surface after grinding with silicon carbide disk

2019 ◽  
Vol 2019 (12) ◽  
pp. 22-28 ◽  
Author(s):  
Vladimir Nosenko ◽  
Alexander Fetisov ◽  
Nikita Serdyukov
Keyword(s):  
Silicon Carbide ◽  
Titanium Alloy ◽  
Chemical Composition ◽  
Surface Morphology ◽  
Ground Surface ◽  
Silicon Concentration ◽  
Alloy Surface ◽  
Initial Composition

The investigation results of the ground surface morphology of titanium alloy TT9 are presented. There are shown electronic photos of metal pickups and silicon carbide crystals. The dimensions of these objects are defined. As a result of abrasive displacement a silicon concentration in nano-layers of the surface worked increases twice as compared with the initial composition in the alloy.

Multi-Component Coatings Formation on Polycathode Magnetron Sputtering Systems

2017 ◽  
Vol 265 ◽  
pp. 166-170
Author(s):  
V.V. Kolesnik ◽  
Yu.K. Rubanov ◽  
Yu.E. Tokach
Keyword(s):  
Chemical Composition ◽  
Magnetron Sputtering ◽  
Coating Thickness ◽  
Diffusion Zone ◽  
Chemical Elements ◽  
Substrate Material ◽  
Coating Materials ◽  
Surface Microrelief ◽  
X Ray ◽  
Coating Formation

The results of experiments aimed at obtaining multi-component coatings, having a wider range of properties compared to single-component coatings, are provided. The process of formation of coating based on multi-component alloy Co (18...20%)-Cr (5...7%)-Al (0.3...0.4%)-Y(0.2...0.5) was studied. The chemical composition and thickness of the coating as well as the state of the transition layer were also studied. The results of electron probing and X-ray fluorescence microanalysis of obtained coatings are provided. This paper also demonstrates that the properties of surface microrelief are determined by the conditions of coating formation; that each sample of coating has similar sets of chemical elements, that their concentration depends on the precipitation conditions, chemical elements are equally distributed along the thickness of samples, and the diffusion zone of coating materials and substrate is almost non-existent. The low content of substrate material was found in obtained coatings. As the coating thickness increased, the content of substrate material decreased sharply.

scholarly journals Characterisation of copper alloy antique ornamental accessories found in Northern Albania

2014 ◽  
Vol 2 (2) ◽  
Author(s):  
Olta Çakaj ◽  
Edlira Duka ◽  
Zamir Tafilica ◽  
Frederik Stamati ◽  
Nikolla Civici ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Copper Alloy ◽  
Evaluation Method ◽  
Chemical Elements ◽  
Casting Process ◽  
Metallic Alloys ◽  
Corrosion Products ◽  
X Ray ◽  
Lead Alloys ◽  
Polarised Light

This study was performed to determine the chemical elements used to produce ancient metallic alloys and to understand the manufacture technique of three archaeological founds. It also presents an evaluation method of the objects’ authenticity based on the observation of the corrosion products. This article also includes three ornamental accessories ca. VII-IV century BC found in the vicinity of Shkodra (Albania). A necklace, a belt application and a button are examined using X ray fluorescence (XRF) to determine the chemical composition and optical microscopy (OM) with reflected and polarised light in order to study the microstructure and the corrosion products. From the XRF results all the objects are bronze, copper-tin and copper-tin-lead alloys. After the OM analysis they are authentic objects (not fake replicas) and might have been produced after a casting process in moulds.

Crack Healing in an Alumina/Silicon Carbide Nanocomposite After Grinding and Annealing

1999 ◽  
Vol 581 ◽  
Author(s):  
H.Z. Wu ◽  
J.M. Titchmarsh ◽  
S.G. Roberts ◽  
B. Derby
Keyword(s):  
Silicon Carbide ◽  
Chemical Composition ◽  
Cross Sections ◽  
Surface Crack ◽  
Annealing Process ◽  
Energy Dispersive ◽  
Polished Surface ◽  
Crack Healing ◽  
X Ray ◽  
Small Improvement

ABSTRACTAlumina/silicon carbide nanocomposites are known to show their highest strength levels after surface grinding followed by annealing. After annealing in flowing argon, nanocomposites with very coarsely ground surfaces have strengths exceeding those with a finely polished surface. Specimens with lapped surfaces also show a small improvement in strength on annealing. TEM investigations of annealed cross-sections show that the annealing process leads to surface crack healing. The chemical composition of the subsurface region has been studied, and reactive products on and close to the nanocomposite surface after annealing have been investigated by energy dispersive X-ray analysis in the STEM.

scholarly journals Research of the Chemical Composition of Industrial Waste of the Kadamzhay Antimony Combine

2020 ◽  
Vol 6 (12) ◽  
pp. 73-78
Author(s):  
N. Erkinbaeva ◽  
Y. Tashpolotov ◽  
E. Ysmanov
Keyword(s):  
Chemical Composition ◽  
Industrial Waste ◽  
Toxic Elements ◽  
Chemical Elements ◽  
New Products ◽  
Atomic Emission ◽  
Waste Dump ◽  
X Ray ◽  
Fluorescence Methods ◽  
Titanium Vanadium

This article investigates the chemical composition of industrial waste (dump slag and flotation tailings). This study, in contrast to previous studies, was carried out by chemical, atomic emission, X-ray fluorescence methods. Valuable rare earth chemical elements (ytterbium, yttrium, lanthanum, scandium), valuable chemical elements (antimony, titanium, vanadium, tungsten, niobium, indium, germanium, gallium, tantalum, molybdenum, strontium, beryllium, zirconium, cobalt) and others have been determined. The oxides of elements (SiO2, Al2O3, MgO, CaO, Fe2O3, Na2O, K2O, S, FeO) have been investigated. Toxic elements (arsenic, cadmium, tin, lead). These studies were carried out with the aim of using man-made waste in various sectors of the national economy for the disposal of man-made waste and to improve the environmental situation in the region and reduce material costs for the production of new products.

scholarly journals Physicochemical investigation of shrimp fossils from the Romualdo and Ipubi formations (Araripe Basin)

PeerJ ◽  
2019 ◽  
Vol 7 ◽  
pp. e6323 ◽  
Author(s):  
Olga Alcântara Barros ◽  
João Hermínio Silva ◽  
Gilberto Dantas Saraiva ◽  
Bartolomeu Cruz Viana ◽  
Alexandre Rocha Paschoal ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Chemical Elements ◽  
Hydroxyl Group ◽  
Large Field ◽  
Field Energy ◽  
X Ray Diffraction ◽  
X Ray ◽  
Iron Aluminum ◽  
Physicochemical Investigation ◽  
Dominant Phase

The Ipubi and Romualdo Formations are Cretaceous units of the Araripe Basin (Santana Group). The first and most ancient was deposited in a lake environment, and some fossils were preserved in shales deposited under blackish conditions. The second was deposited in a marine environment, preserving a rich paleontological content in calcareous concretions. Considering that these two environments preserved their fossils under different processes, in this work we investigated the chemical composition of two fossilized specimens, one from each of the studied stratigraphic units, and compared them using vibrational spectroscopy techniques (Raman and IR), X-ray diffraction and large-field energy-dispersive X-ray spectroscopy (EDS) mappings. Calcite was observed as the dominant phase and carbon was observed in the fossils as a byproduct of the decomposition. The preservation of hydroxide calcium phosphate (Ca10(PO4)6(OH)2, hydroxyapatite) was observed in both fossils. In addition, it was observed that there was a smaller amount of pyrite (pyritization) in the Romualdo Formation sample than in the Ipubi one. Large-field EDS measurements showed the major presence of the chemical elements calcium, oxygen, iron, aluminum and fluoride in the Ipubi fossil, indicating a greater influence of inorganic processes in its fossilization. Our results also suggest that the Romualdo Formation fossilization process involved the substitution of the hydroxyl group by fluorine, providing durability to the fossils.

X-ray microanalysis of mixed saliva with fluorosis

2019 ◽  
pp. 38-41
Author(s):  
A.A. Musiev ◽  
A.G. Volkov ◽  
N.Zh. Dikopova ◽  
N.V. Makarenko ◽  
T.V. Budina ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Oral Fluid ◽  
Phosphorus Content ◽  
Chemical Elements ◽  
Dental Fluorosis ◽  
Fluorine Content ◽  
X Ray ◽  
Endemic Focus ◽  
Significant Difference ◽  
Mixed Saliva

The aim of this research was to study patients with the chemical composition of mixed saliva in fluorosis using X-ray microanalysis both living in the endemic center of fluorosis and leaving it. The research involved 64 patients with dental fluorosis, all male, age — 20—35 years. To accomplish the purpose of the study, two groups were formed from them: the first group included 33 people with dental fluorosis of dashed and spotted forms, living in an endemic center of fluorosis (Krasnogorsk district, Moscow region). The second group included 31 people with dental fluorosis who left the endemic focus and live in areas with normal fluoride content in water. Results. According to the content in the mixed saliva of a number of chemical elements, no significant difference (p>0.05) was found between the studied groups. These elements include: carbon, nitrogen, oxygen, silicon, sulfur, and calcium. However, the content of other chemical elements in the oral fluid was observed statistically significant differences (p<0.05) between patients with fluorosis living in the focus of endemic lesion and patients who migrated beyond it. Thus, in the first group, in the studied saliva, the fluorine content was 42% higher than in the second. Also in this group, compared with the second, the phosphorus content was higher 18%, chlorine and potassium 27%. The content of sodium in the first group was 27% lower than in the second.

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