scholarly journals INVESTIGATION OF THE EFFECT OF HEATING ON THE STRUCTURE AND PHASE COMPOSITION OF AL-TI COMPOSITES

2020 ◽  
pp. 7-14
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
V. P. Kulevich ◽  
A. S. Ivanov
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Titanium Surface ◽  
Treatment Temperature ◽  
Accelerated Cooling ◽  
Interaction Zone ◽  
Aluminum Layer ◽  
Diffusion Interaction ◽  
Phase And Chemical Composition ◽  
Spontaneous Separation

The results of studies of the diffusion interaction of titanium with aluminum at a temperature of 650 ° C are presented. The phase and chemical composition of the diffusion interaction zone and the nature of changes in its thickness from the exposure time are determined. It is shown that accelerated cooling of explosion-welded composites from the heat treatment temperature leads to spontaneous separation of the aluminum layer with the formation of a coating based on intermetallic TiAl on the titanium surface.

Structure and Phase Composition of the Al-Ti System Composites after Heat Treatment

2021 ◽  
Vol 410 ◽  
pp. 519-524
Author(s):  
Victor Georgievich Shmorgun ◽  
Artem I. Bogdanov ◽  
Vitaliy P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Titanium Surface ◽  
Treatment Temperature ◽  
Accelerated Cooling ◽  
Interaction Zone ◽  
Aluminum Layer ◽  
Diffusion Interaction ◽  
Phase And Chemical Composition ◽  
Spontaneous Separation

The studies results of the titanium with aluminum diffusion interaction at a temperature of 650 oC are presented. The phase and chemical composition of the diffusion interaction zone, the nature of the change in its thickness from the exposure time are determined. It is shown that accelerated cooling of explosion-welded composites from the heat treatment temperature leads to spontaneous separation of the aluminum layer with the formation of a coating based on the TiAl3 intermetallic compound on the titanium surface.

Synthesis of pigments in Fe2O3-Al2O3-CoO by co-precipitation method

2017 ◽  
Vol 46 (5) ◽  
pp. 356-361 ◽  
Author(s):  
Liliya Frolova ◽  
Alexander Pivovarov ◽  
Tatyana Butyrina
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Colour Properties ◽  
X Ray Diffraction ◽  
Content Type ◽  
Composition Property ◽  
Yellow Pigments ◽  
Co Precipitation

Purpose The purpose of this work is to study the patterns of pigment colour formation and to develop metal compositions for obtaining spinels using the precipitation and heat treatment methods. Design/methodology/approach Precursor materials were prepared using co-precipitation method. Phase composition of pigments were determined by X-ray diffraction. Colour of pigments was determined spectrophotometry. Modelling of colour formation was performed using simplex method. Planning in the future to carry out full synthesis of pigments of blue, red and yellow colours. Findings The paper deals with the results of theoretical and experimental research on the synthesis pigments of blue, red and yellow colours based on Fe-Co-Al-O spinel. The influence of the chromophore cation content and the heat treatment temperature on optical and colour characteristics of pigments were studied. Originality/value The resulting composition-property diagrams make it possible to evaluate the effect of chromophore cations and heat treatment on the colour formation for Fe2O3-Al2O3-CoO system. Crystal-phase composition of the pigments is installed and its relationship with the optical colour characteristics. That makes it possible carry out targeted synthesis of pigments blue, red and yellow colours in further. The phase composition of pigments and its relationship with optical and colour properties has been established thus enabling the directed synthesis of blue, red and yellow pigments.

scholarly journals PHASE COMPOSITION OF THE INTERACTION ZONE FORMED IN THE TI-CU SYSTEM COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2020 ◽  
pp. 18-24
Author(s):  
V. G. Shmorgun ◽  
O. V. Slautin ◽  
A. G. Serov ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Solid Solution ◽  
Phase Composition ◽  
Liquid Phase ◽  
Nickel Alloy ◽  
Intermetallic Compounds ◽  
Melting Temperature ◽  
Weight Fraction ◽  
Interaction Zone ◽  
Copper Nickel Alloy

It was shown that heat treatment of Ti-Cu system composites at temperatures above the melting temperature of copper (copper-nickel alloy) leads to the formation of an interaction zone, the structure and phase composition of which is determined by the temperature and time of existence of the liquid melt solid solution in contact with the interlayer. Other things being equal, an increase in the exposure time leads to an increase in the volume of reacted titanium and the weight fraction of titanium-rich intermetallic compounds in its structure.

Effect of the High-Heating on the Chemical and Phase Composition of the Al-Ni-Cr Layered Coatings

2016 ◽  
Vol 870 ◽  
pp. 169-174 ◽  
Author(s):  
Victor Georgievich Shmorgun ◽  
A.I. Bogdanov ◽  
A.O. Taube
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Chemical Composition ◽  
Binary System ◽  
Diffusion Coatings ◽  
Layered Coatings ◽  
Structure Phase ◽  
High Heating ◽  
Phase And Chemical Composition ◽  
Diffusion Redistribution

The transformation of the structure, phase and chemical composition of the diffusion coatings of the system Al-Ni and Al-Cr-Ni at 1100 °C is studied. It is shown that the diffusion redistribution of Al by the coating thickness during the heat treatment is slower in the system Al-Cr-Ni than in the binary system Al-Ni.

Phase Transformation of Coal at High Temperature

2014 ◽  
Vol 809-810 ◽  
pp. 815-821
Author(s):  
Xiao Hu Hua ◽  
Xiao Gang Wang ◽  
Jia Qing Yang ◽  
Shu He Lu ◽  
Li Rong Deng ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Phase Transformation ◽  
Phase Composition ◽  
High Temperature ◽  
Internal Migration ◽  
Heat Treatment Temperature ◽  
Functional Group ◽  
Treatment Temperature ◽  
Conductive Phase ◽  
Higher Temperature

Anthracite and bitumite were processed respectively at 1400°C,1700°C, 2000°C, 2200°C, 2400°C and 2600°C,and their chemical composition,resistivity,microstructure, phase composition,and the internal migration of molecular functional group were tested and characterized. The results indicate that moisture, ash and volatile in coal have gradually shifted and lost with the elevation of heat treatment temperature, while the higher temperature, the quicker and completer phase change. Heat treatment can make the coal transform from approximately insulative phase to conductive phase,. Furthermore, as the temperature increases, the conductive phase transformation effect is better. The higher the heat treatment temperature of coal, the more amorphous carbon transforming into crystalline carbon completely, but the less types of phases .

scholarly journals PHASE COMPOSITION AND CRYSTALLINITY OF HYDROXYAPATITE WITH VARIOUS HEAT TREATMENT TEMPERATURES

2018 ◽  
Vol 9 ◽  
pp. 87 ◽  
Author(s):  
Decky J Indrani ◽  
Bambang Soegijono ◽  
Wisnu A Adi ◽  
Neil Trout
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Phosphorous Acid ◽  
Chemical Precipitation ◽  
Hexagonal Structure ◽  
Treatment Temperature ◽  
Precipitation Method ◽  
Phase Identification ◽  
X Ray Diffraction ◽  
Additional Phase

Objective: This study investigated effects of heat treatment on the crystallinity and phase composition of hydroxyapatites (HAs) of different heat treatment.Methods: HA powder was synthesized by the chemical precipitation method based on the reaction between the phosphorous acid and calcium hydroxide. Synthesized HA was divided into three groups for which each group was then given heat treatment at 100°C, 900°C, or 1300ºC. Phase identification, analyses and the crystallinity of the synthesized HAs were determined using the X-ray diffraction coupled with the Rietveld refinement.Results: The synthesized HAs with each heat treatment were identified as HA phase containing hexagonal structure. Those treated at 100°C or 900°C revealed with crystallinity of 48% and 68%, respectively, with no additional phase; whereas, those treated at 1300°C produced a crystallinity of 72% and contained dicalcium and tricalcium phosphates.Conclusion: The synthesized HAs treated at 100°C, 900°C, or 1300°C were HA phase with hexagonal structure. The variable crystallinity of the synthesized HAs yielded from different heat treatment temperature correspondingly determines different phase composition.

Analysis of Thermal Stresses in Layered Composite AD1 + Cr20Ni80 + M1 after Heat Treatment

2019 ◽  
Vol 946 ◽  
pp. 8-13 ◽  
Author(s):  
Victor Georgievich Shmorgun ◽  
Artem I. Bogdanov ◽  
Alexander O. Taube
Keyword(s):  
Heat Treatment ◽  
Thermal Stresses ◽  
Layered Composite ◽  
Diffusion Annealing ◽  
Aluminum Layer ◽  
Tensile Stresses ◽  
Al Composite ◽  
Spontaneous Separation

The results of modeling of the influence of layers thickness of the Ni-Cr-Al composite on value of thermal stresses on its interlayer boundaries after diffusion annealing are presented. It is shown that the cooling of the AD1-Cr20Ni80 composite after annealing, which provides formation of a DZ at its interlayer boundary, consisting of three interlayers (CrAl7, NiAl3 + CrAl7 and Ni2Al3 + CrAl7), leads to spontaneous separation of the aluminum layer,due to the action of tensile stresses, exceeding the zone strength of the interlayer boundaries (CrAl7) - (NiAl3 + CrAl7), and at k> 0.3 - (NiAl3 + CrAl7) - (Ni2Al3 + CrAl7) with the ratio of layers thickness of aluminum and the alloy Cr20Ni80 - k <0.3, which leads to the formation of layered Cr20Ni80 / ( Ni2Al3 + CrAl7) / (NiAl3 + CrAl7) or Cr20Ni80 / (Ni2Al3 + CrAl7) coatings.

scholarly journals FORMATION OF THE STRUCTURE AND COMPOSITION OF THE DIFFUSION INTERACTION ZONE DURING THE HEAT TREATMENT OF THE EXPLOSION-WELDED AD1 + Cr20Ni80 COMPOSITE IN THE PRESENCE OF A LIQUID PHASE

2021 ◽  
pp. 7-11
Author(s):  
V. G. Shmorgun ◽  
A. I. Bogdanov ◽  
D. V. Shcherbin ◽  
V. P. Kulevich
Keyword(s):  
Heat Treatment ◽  
Phase Composition ◽  
Melting Point ◽  
Liquid Phase ◽  
Intermetallic Compounds ◽  
Diffusion Coating ◽  
Phase Interaction ◽  
Interaction Zone ◽  
Coating Structure ◽  
Study Results

The paper presents the study results of the structure, chemical and phase composition of the diffusion coating formed during the heat treatment of the explosion-welded Cr20Ni80 + AD1 bimetal according to the regime providing liquid-phase interaction (above the melting point of aluminum) on the surface of the Cr20Ni80 alloy. It is shown that its structure consists of inclusions of NiAl, CrAl, NiAl intermetallic compounds, as well as a metastable ternary compound - τ-phase with composition of AlCrNi of different dispersion and morphology. There are no crystallization defects in the coating structure.

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