High Temperature Thermodynamic Properties of Copper-Nickel Alloys

1979 ◽  
Vol 18 (4) ◽  
pp. 401-406 ◽  
Author(s):  
Jose M. Larrain
Keyword(s):  
High Temperature ◽  
Thermodynamic Properties ◽  
Nickel Alloys ◽  
Copper Nickel

High-temperature oxidation of the copper-nickel based alloys synthesized by spark plasma sintering

2021 ◽  
Vol 10 ◽  
pp. 47-55
Author(s):  
N. P. Burkovskaya ◽  
◽  
N. V. Sevostyanov ◽  
F. N. Karachevtsev ◽  
E. M. Shcherbakov ◽  
...  
Keyword(s):  
Growth Rate ◽  
High Temperature ◽  
Heat Resistance ◽  
Spark Plasma Sintering ◽  
Nickel Alloys ◽  
High Temperature Oxidation ◽  
Temperature Oxidation ◽  
Copper Nickel ◽  
Plasma Sintering ◽  
Spark Plasma

The article presents data on heat resistance high-temperature tests of powder materials based on copper-nickel have been carried out. The oxidation features of materials samples with various alloying elements have been studied. Compaction of copper-nickel alloys samples was done by spark plasma sintering (SPS). The dependence of the growth rate of the oxide film on the temperature of high-temperature oxidation was established, and the effect of alloying elements in the composition of the samples on their heat resistance was considered. Based on the study’s results the dependence of the oxide film growth rate on high-temperature oxidation and the influence of alloying elements in the composition of sintered copper-nickel alloys on their heat resistance are considered. It was determined that for all the considered samples compositions of copper-nickel alloys synthesized by spark plasma sintering, the temperature 1000 °C of 20-hour heating heat resistance test is not the limiting one, since the samples retain their integrity. It is shown that simultaneous alloying of copper-nickel alloys with aluminum and chromium provides the highest heat resistance. The scale growth rate for composition Cu – Ni – Cr – Al 1.49·10–3 g/cm3 is lower than the oxidation rate of pure nickel 3.78·10–3 g/cm3 at 1000 °C. These two samples demonstrate the lowest weight gain after testing at 1000 °С, for compositions Cu – Ni – Al, Cu – Ni – Cr – Si and 50 wt. % Cu – 50 wt. % Ni the oxidation rate increases by two orders of magnitude, for compositions Cu – Ni – Si and Ni — by three orders of magnitude.

scholarly journals Oxydation à haute température de l’alliage Cu54Ni45Mn1 : analyse isotherme

2020 ◽  
Vol 14 (3) ◽  
pp. 1144-1152
Author(s):  
Sassou Megnassan ◽  
Koffi Jondo
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Diffusion Mechanism ◽  
Outer Region ◽  
Isothermal Oxidation ◽  
Temperature Oxidation ◽  
Copper Nickel ◽  
Resistance To Oxidation ◽  
Isothermal Analysis ◽  
Inner Region

Dans la recherche de nouveaux matériaux possédant un meilleur comportement à l’oxydation haute température, les alliages cuivre-nickel sont de bons candidats grâce à leur résistance à l’oxydation. Cette étude est consacrée à la cinétique d’oxydation isotherme de l’alliage Cu54 Ni45 Mn1. Une étude de l’oxydation à haute température, de l’alliage Cu54Ni45Mn1 (constantan) dans l’oxygène a été réalisée. Les oxydations ont été réalisées par thermogravimétrie en mode isotherme, pour une gamme de températures comprises entre 650 °C et 900 °C et suivies à l'aide du microscope électronique à balayage (MEB) couplé à l’EDX. Les résultats obtenus montrent que la cinétique n’est pas essentiellement parabolique mais elle est composée d’une loi parabolique (α < 20%), suivie de deux lois linéaires pour 20% < α < 40% et α > 50%. La couche d’oxyde formée se divise en deux régions : une région externe constituée de CuO et une région interne formée de Cu2O, NiO et de MnO. L’interface entre les deux régions reflète la limite initiale de l’alliage, ce qui montre que l’oxydation est gouvernée par un mécanisme de diffusion. En perspective, une étude sur le rôle du manganèse dans la tenue à l’oxydation est envisagée ainsi que l’oxydation non isotherme de l’alliage.Mots clés : Alliages cuivre-nickel, constantan, oxydation, diffusion.   English Title: High temperature oxidation of the Cu54Ni45Mn1 alloy: isothermal analysis the search for new materials with better oxidation behavior, copper-nickel alloys are good candidates because of their resistance to oxidation. This study is devoted to the kinetic of oxidation of the Cu54Ni45Mn1 alloy. A study of the oxidation of Cu54Ni45Mn1 (constantan) in oxygen at high temperature has been carried out. Oxidations studies performed by thermogravimetry in isothermal mode, for a range of temperatures between 650 °C and 900 °C and monitored using the scanning electron microscope (SEM) coupled to the EDX. The results obtained show that the kinetics is not essentially parabolic but it is composed of a parabolic law (α < 20%), followed by two linear laws for 20% < α < 40% and α > 50%. The obtained oxide layer is divided into two regions: an outer region consisting of CuO and an inner region formed of Cu2O, NiO and MnO. The interface between the two regions reflects the initial limit of the alloy, which shows that the oxidation is governed by a diffusion mechanism. In perspective, a study on the role of manganese in the oxidation is envisaged as well as the non-isothermal oxidation of the alloy.Keywords: Copper-nickel alloys, constantan, oxidation, diffusion.

Influence of Thermo-Mechanical Processing on the Microstructure of Beryllia Dispersed Nickel Alloys

1973 ◽  
Vol 31 ◽  
pp. 184-185
Author(s):  
M.S. Grewal ◽  
S.A. Sastri ◽  
N.J. Grant
Keyword(s):  
High Temperature ◽  
Nickel Alloys ◽  
Thermomechanical Processing ◽  
Cold Work ◽  
High Temperature Strength ◽  
Strengthening Effect ◽  
Mechanical Processing ◽  
Uniform Dispersion ◽  
Oxide Particles ◽  
Nickel Base

Currently there is a great interest in developing nickel base alloys with fine and uniform dispersion of stable oxide particles, for high temperature applications. It is well known that the high temperature strength and stability of an oxide dispersed alloy can be greatly improved by appropriate thermomechanical processing, but the mechanism of this strengthening effect is not well understood. This investigation was undertaken to study the dislocation substructures formed in beryllia dispersed nickel alloys as a function of cold work both with and without intermediate anneals. Two alloys, one Ni-lv/oBeo and other Ni-4.5Mo-30Co-2v/oBeo were investigated. The influence of the substructures produced by Thermo-Mechanical Processing (TMP) on the high temperature creep properties of these alloys was also evaluated.

OLIN BRASS ALLOY C19020

Alloy Digest ◽  
2020 ◽  
Vol 69 (2) ◽  
Keyword(s):  
Corrosion Resistance ◽  
High Temperature ◽  
Physical Properties ◽  
Tensile Properties ◽  
Carrying Capacity ◽  
Service Temperature ◽  
Brass Alloy ◽  
Copper Nickel ◽  
Temperature Performance ◽  
Company Limited

Abstract Olin Brass Alloy C19020 is a copper-nickel-tin low-alloyed copper. It was developed as alloy NB-105 by Dowa Metaltech Company Limited, Japan, to meet increasing requirements of current carrying capacity, stiffness, formability and service temperature survivability being demanded by the automotive and electronic industries. This datasheet provides information on composition, physical properties, elasticity, and tensile properties. It also includes information on high temperature performance and corrosion resistance as well as forming and joining. Filing Code: Cu-905. Producer or source: Olin Brass, GBC Metals, LLC.

A NEW WELDING MATERIAL FOR REGENERATION IN THE WELDING TECHNOLOGY BASED ON NICKEL. ANALYSIS OF THE COMPOSITION AND PROPERTIES OF DEFORMABLE HEAT-RESISTANT HIGH-CHROMIUM NICKEL-BASED ALLOYS FOR WELDED PARTS. ANALYSIS OF EXISTING FUELLING STATIONS TYPES AND VEHICLES USING HYDROGEN, HYDROGEN PRODUCTION AND STORING METHODS

2019 ◽  
pp. 43-48
Author(s):  
Ben Nengjun ◽  
Zhou Pengfei ◽  
Oleksandr Labartkava ◽  
Mykhailo Samokhin
Keyword(s):  
Rare Earth ◽  
High Temperature ◽  
Nickel Alloys ◽  
Total Content ◽  
Operating Conditions ◽  
High Temperature Strength ◽  
High Chromium ◽  
Salt Corrosion ◽  
Tcp Phases ◽  
The Impact

This work involves an analysis of high-chromium high-temperature deformable wieldable nickel alloys for use in GTE repair assemblies. It is shown that the alloys EP868 (VZh98) and Haynes 230 can be used in welded assemblies with an operating temperature of 800-1100 °C. The alloys Nimonic 81, Nimonic 91, IN 935, IN 939, and Nicrotan 2100 GT also have a high potential for use in welded assemblies. They are characterized by a combination of good weldability, high-temperature strength, and resistance to scaling. There have been conducted studies on high-temperature salt corrosion of model nickel alloys. They allowed establishing the patterns of the impact of base metal alloying with chromium, aluminum, titanium, cobalt, tungsten, molybdenum, niobium, tantalum and rare earth metals on the critical temperature of the start of salt corrosion Tcor and the alloy mass loss. It has been established that alloys with a moderate concentration (13-16%) of chromium can possess satisfactory hightemperature corrosion resistance (HTC resistance) under the operating conditions of ship GTE. The HTC resistance of CrAl-Ti alloys improves upon reaching the ratio Ti/Al ˃ 1. Meanwhile, the ratio Ti/Al ˂ 1 promotes the formation of corrosion products with low protective properties. The positive effect of tantalum on the HTC resistance of alloys is manifested at higher test temperatures than that of titanium, and the total content of molybdenum and tungsten in alloys is limited by the condition 8Mo2 – 2W2 = 89. The presence of refractory elements stabilizes the strengthening phase and prevents formation of the ɳ-phase. However, their excess promotes formation of the embrittling topologically close packed (TCP) phases and boundary carbides of an unfavorable morphology. Based on the studies of the HTC resistance, there has been identified a class of model high-temperature corrosionresistant nickel alloys with a moderate or high chromium content (30%), Ti/Al ˃ 1, and a balanced content of refractory and rare-earth elements.

Thermal prehistory, structure and high-temperature thermodynamic properties of Y2O3-CeO2 and Y2O3-ZrO2-CeO2 solid solutions

2020 ◽  
Author(s):  
Olga Yu Kurapova ◽  
Sergey M. Shugurov ◽  
Evgenia A. Vasil'eva ◽  
Daniil A. Savelev ◽  
Vladimir G. Konakov ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermodynamic Properties ◽  
Solid Solutions ◽  
Thermal Prehistory
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