The Effect of the Microstructure on Oxidation of Sulfide-Metal Alloys of Copper and Nickel

2011 ◽  
Vol 312-315 ◽  
pp. 306-311 ◽  
Author(s):  
Evgeny N. Selivanov ◽  
R.I. Gulyaeva ◽  
L.Y. Udoeva ◽  
A.D. Verchinin
Keyword(s):  
Phase Transformation ◽  
Phase Composition ◽  
High Temperature ◽  
Nickel Alloy ◽  
Mass Spectrometric ◽  
Metal Alloys ◽  
Continuous Heating ◽  
X Ray ◽  
Oxidation Processes ◽  
Copper Nickel Alloy

The methods of thermal, thermogravimetric, mass spectrometric and high-temperature X-ray analysis have been used to determine the chemism of the processes involving the oxidation of a sulfide-metal copper-nickel alloy during continuous heating to 1190 K in an air flow. It has been found that the fineness of particles, the size of the sulfide phases in these particles, and the phase composition influence the phase transformation temperatures, as well as the kinetics and the sequence of the oxidation processes.

ACCURATE METAL

Alloy Digest ◽  
1969 ◽  
Vol 18 (10) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Surface Treatment ◽  
Tensile Properties ◽  
Nickel Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Temperature Performance ◽  
Copper Nickel Alloy

Abstract ACCURATE METAL is a copper-nickel alloy having high strength, ductility and corrosion resistance. It was especially designed for exacting electronic and electrical applications. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as fatigue. It also includes information on high temperature performance and corrosion resistance as well as forming, heat treating, joining, and surface treatment. Filing Code: Cu-207. Producer or source: Connecticut Metals Corporation.

Dimorphic ThNi2P2 with BaCu2S2 and CaBe2Ge2 Type Structure

1994 ◽  
Vol 49 (8) ◽  
pp. 1074-1080 ◽  
Author(s):  
Jörg H. Albering ◽  
Wolfgang Jeitschko
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Crystal Structures ◽  
Type Structure ◽  
Variable Parameters ◽  
Higher Symmetry ◽  
X Ray ◽  
Coordination Numbers ◽  
Structure Factors ◽  
High Temperature Form

Two modifications of ThNi2P2 were prepared in a tin flux at 850 °C (α-ThNi2P2) and 1000 °C (β-ThNi2P2). The crystal structures of both modifications were refined from single­crystal X-ray data. α-ThNi2P2 (BaCu2S2 type structure): Pnma. a = 819.69(5), b = 394.28(3), c = 981.54(7) pm. R = 0.028 for 32 variables and 654 structure factors: β-ThNi2P2 (CaBe2Ge2 type structure): P4/nmm, a = 408.5(1), c = 908.0(3) pm, R = 0.033 for 15 variable parameters and 261 F values. Although the two structures are closely related, they can be transformed into each other only by a reconstructive phase transformation. The differences and similari­ties of the two structures are discussed. The high temperature form has higher symmetry, a smaller number of variable positional parameters, and a tendency for higher coordination numbers.

scholarly journals Determination of Chromite Sands Suitability for Use in Moulding Sands

2017 ◽  
Vol 17 (2) ◽  
pp. 107-110
Author(s):  
K. Stec ◽  
J. Podwórny ◽  
B. Psiuk ◽  
Ł. Kozakiewicz
Keyword(s):  
Phase Composition ◽  
High Temperature ◽  
Chemical Composition ◽  
Chemical Properties ◽  
Grinding Process ◽  
X Ray Diffraction ◽  
Scanning Microscope ◽  
Spectroscopy Technique ◽  
X Ray

Abstract Using the available analytical methods, including the determination of chemical composition using wavelength-dispersive X-ray fluorescent spectroscopy technique and phase composition determined using X-ray diffraction, microstructural observations in a highresolution scanning microscope equipped with an X-ray microanalysis system as well as determination of characteristic softening and sintering temperatures using high-temperature microscope, the properties of particular chromite sands were defined. For the study has been typed reference sand with chemical properties, physical and thermal, treated as standard, and the sands of the regeneration process and the grinding process. Using these kinds of sand in foundries resulted in the occurrence of the phenomenon of the molding mass sintering. Impurities were identified and causes of sintering of a moulding sand based on chromite sand were characterized. Next, research methods enabling a quick evaluation of chromite sand suitability for use in the preparation of moulding sands were selected.

Influence of Mn and Ni on Austenite Stabilization during a High Temperature Q&P Treatment

2021 ◽  
Vol 1016 ◽  
pp. 379-384
Author(s):  
Eider Del Molino ◽  
Teresa Gutierrez ◽  
Mónica Serna-Ruiz ◽  
Maribel Arribas ◽  
Artem Arlazarov
Keyword(s):  
Phase Transformation ◽  
Electron Microscope ◽  
High Temperature ◽  
Retained Austenite ◽  
Nickel Content ◽  
X Ray Diffraction ◽  
Quenching And Partitioning ◽  
X Ray ◽  
Scanning Electron ◽  
P Cycle

The aim of this work was to study the influence of quenching and partitioning temperatures combined with various levels of Mn and Ni contents on the austenite stabilization along the quenching and partitioning (Q&P) cycle. Three steels with 2 wt.%, 4 wt.% and 6 wt.% manganese and one steel with 2 wt.% nickel content were investigated. Phase transformation temperatures and critical cooling rates were obtained experimentally using dilatometer for each alloy. Q&P cycles with different quenching and partitioning temperatures were also done in dilatometer, thus, allowing monitoring of the expansion/contraction during the whole Q&P cycle. Microstructure characterization was performed by means of a Scanning Electron Microscope and X-Ray Diffraction to measure retained austenite content. It was found that, strongly depending on the Q&P conditions, austenite stabilization or decomposition occurs during partitioning and final cooling. In case of high partitioning temperature cycles, austenite reverse transformation was observed. Certain cycles resulted in a very effective austenite stabilization and interesting microstructure.

Biomorphic TiO2 Ceramics Prepared from Cotton Stalk

2012 ◽  
Vol 602-604 ◽  
pp. 526-529
Author(s):  
Qing Wang ◽  
Lin Zhang ◽  
Ya Hui Zhang
Keyword(s):  
Electron Microscopy ◽  
Scanning Electron Microscopy ◽  
Phase Composition ◽  
High Temperature ◽  
Sol Gel ◽  
Cotton Stalk ◽  
X Ray Diffraction ◽  
X Ray ◽  
Carbon Template ◽  
Scanning Electron

Biomorphic TiO2 was prepared by high temperature pyrolysis and a modified sol-gel route. The morphology and microstructure of TiO2 samples were characterized by scanning electron microscopy. The phase composition of the resulting sample was analyzed by X-ray diffraction. The results suggest that the biomorphic TiO2 mainly consists of rutile TiO2, and replicates the shape and part microstructure of the carbon template.

X-ray Photoelectron Spectroscopy Investigation of Corrosion Behavior of ASTM C71640 Copper-Nickel Alloy in Seawater

CORROSION ◽  
1992 ◽  
Vol 48 (5) ◽  
pp. 404-410 ◽  
Author(s):  
R. Zanoni ◽  
G. Gusmano ◽  
G. Montesperelli ◽  
E. Traversa
Keyword(s):  
Nickel Alloy ◽  
Corrosion Behavior ◽  
Photoelectron Spectroscopy ◽  
X Ray ◽  
Copper Nickel ◽  
Copper Nickel Alloy

Displacive Phase Transformation in Vanadium - Substituted Lanthanum Niobate

1983 ◽  
Vol 24 ◽  
Author(s):  
A. T. Aldred ◽  
S.-K. Chan ◽  
M. H. Grimsditch ◽  
M. V. Nevitt
Keyword(s):  
Phase Transformation ◽  
High Temperature ◽  
Low Temperature ◽  
Raman Scattering ◽  
Transformation Temperature ◽  
Complex Oxides ◽  
Temperature Structure ◽  
X Ray Diffraction ◽  
X Ray ◽  
First Order

ABSTRACTThe displacive transformations in complex oxides of the type LaNb1-xVxO4 has been studied by x-ray diffraction and Raman scattering for 0 < x < 0.3. X-ray diffraction results indicate that the transformation from the tetragonal high temperature structure (C4h6) to the monoclinic low-temperature structure (C2h6) is higher than first order and that the transformation temperature Tc is depressed significantly by V substitution. Raman scattering results show that the force constant between the nearest (Nb, V)O4 tetrahedral units behave uniquely compared to others. It softens at Tc as a function of composition and it also softens as a function of temperature as Tc is approached from above.

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.

The high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3Al2O32SiO2) and vitreous silica (SiO2)

1978 ◽  
Vol 42 (322) ◽  
pp. 195-198 ◽  
Author(s):  
Wolfgang Pannhorst ◽  
Hartmut Schneider
Keyword(s):  
Phase Transformation ◽  
Infrared Spectroscopy ◽  
High Temperature ◽  
Single Crystal ◽  
Vitreous Silica ◽  
X Ray ◽  
Temperature Transformation ◽  
Two Phases ◽  
Topotactic Transformation ◽  
Orientational Relationship

SummaryThe high-temperature transformation of andalusite (Al2SiO5) into 3/2-mullite (3A2O32SiO2) plus vitreous silica (SiO2) has been studied within the temperature interval from 1300 to 1600 °C by means of X-ray powder and single-crystal techniques and by infrared spectroscopy. Results are interpreted in terms of a topotactic transformation in which (011) and (01) planes of andalusite transform into (20) and (201) planes of 3/2-mullite; in this way the a- and b-axes of the two phases are interchanged. From the structural and orientational relationship between the andalusite and 3/2-mullite latrices it is concluded that the aluminium-oxygen octahedral chains, running in both structures parallel to the crystallographic c-axis, are preserved during phase transformation.

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