Dependance of Wear of Cu-Cr-S Alloy on Hardness and Electrical Conductivity in Sliding Electrical Contact

2017 ◽  
Vol 267 ◽  
pp. 229-233
Author(s):  
Lembit Kommel ◽  
Janis Baroninš
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Vickers Microhardness ◽  
Electrical Contact ◽  
High Electrical Conductivity ◽  
High Tensile Strength ◽  
Equal Channel Angular Press ◽  
Suitable Heat Treatment ◽  
Sliding Electrical Contact ◽  
Wear Tests

Wear of material in unlubricated sliding type electrical contact (e.g. contact wires for trolleys and rotor materials in electric engines and current generators) is one of the main failure causing modes of copper (Cu)-based alloys. High electrical conductivity, high tensile strength, suitable hardness and wear resistance under such conditions should be provided. In a present paper required properties of dispersion-hardened Cu-based electrical conductive alloy (Cu-0.68 wt. % Cr-0.02 wt. % S) were obtained by equal-channel angular press treatment with following six press treatments by Bc route and suitable heat treatment. The wear tests were carried out in unlubricated sliding pair with graphite disk. Optimal properties were reached after annealing at 450 °C for 1 h, exhibiting a lowest wear rate (~1.9268·10-9 g·m-1), high electrical conductivity (up to 95 % IACS) and Vickers microhardness up to 1.7 GPa, respectively.

Wear behaviour of metals in dry sliding against molybdenum with current collection

2020 ◽  
pp. 118-125
Author(s):  
M. I. Aleutdinova ◽  
V. V. Fadin
Keyword(s):  
Electrical Conductivity ◽  
Electrical Contact ◽  
Wear Behaviour ◽  
High Wear Resistance ◽  
Dry Sliding ◽  
High Electrical Conductivity ◽  
Current Collection ◽  
Ferrous Metals ◽  
Non Ferrous Metals ◽  
Sliding Electrical Contact

The possibility of high electrical conductivity of dry sliding electrical contact against molybdenum counterbody was studied. It was found that metals W and Cu were not able to form a sliding electrical contact with high wear resistance at current density higher 100 A/cm2 . The characteristics of the contacts of iron containing metals were slightly better than the contact characteristics of non-ferrous metals due to weaker adhesion. Using X-ray phase analysis, it was shown the absence of oxides in the sliding zone of non-ferrous metals. This led to their strong wear and contact’s low electrical conductivity. In the contact zone of iron containing samples the formation of FeO was observed that made it possible to reduce wear. This means that high electrical conductivity is unattainable in sliding with current collection against molybdenum.

DEVELOPMENT OF HIGH STRENGTH AND HIGH CONDUCTIVITY Cu–Ag ALLOY FOR MEDICAL ULTRASOUND EQUIPMENT

2010 ◽  
Vol 17 (01) ◽  
pp. 93-97 ◽  
Author(s):  
HOON CHO ◽  
BYOUNG-SOO LEE ◽  
HYUNG-HO JO
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Aging Treatment ◽  
High Strength ◽  
Copper Matrix ◽  
Medical Ultrasound ◽  
High Electrical Conductivity ◽  
Aging Heat Treatment ◽  
Mechanical And Electrical Properties

The effect of thermal heat treatment on the mechanical and electrical properties of Cu–Ag alloys was investigated. The homogenization heat treatment leads to an increase in tensile strength and a decrease in electrical conductivity due to dissolution of Ag into copper matrix. Also, it is shown that electrical conductivity of as-cast Cu–Ag alloys decreases with increasing Ag content. In contrast, the aging heat treatment gives rise to increase both the tensile strength and electrical conductivity because the Ag solute diffuses out from copper matrix during aging heat treatment. Therefore, it can be mentioned that the electrical conductivity of Cu–Ag alloys depends on Ag solute in copper matrix. Also, aging treatment is favorable to acquire high strength and high electrical conductivity.

HITENSO 162

Alloy Digest ◽  
1981 ◽  
Vol 30 (4) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
Corrosion Resistance ◽  
Physical Properties ◽  
Tensile Properties ◽  
Heat Treating ◽  
Electrical Contacts ◽  
Unique Combination ◽  
High Electrical Conductivity ◽  
High Tensile Strength

Abstract HITENSO 162 is a copper-cadmium alloy that offers a unique combination of high tensile strength and high electrical conductivity in wire where ordinarily these properties are incompatible. It also is noted for its malleability and toughness. Among its many uses are heating pads, electric blankets, current-carrying rings and electrical contacts. This datasheet provides information on composition, physical properties, elasticity, and tensile properties as well as fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-416. Producer or source: Anaconda Industries.

scholarly journals EFFECT OF SN COMPONENT ON PROPERTIES AND MICROSTRUCTURE CU-NI-SN ALLOYS

2018 ◽  
Vol 80 (6) ◽  
Author(s):  
D. N. Nguyen ◽  
A. T. Hoang ◽  
X. D. Pham ◽  
M. T. Sai ◽  
M. Q. Chau ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Tensile Strength ◽  
Spinodal Decomposition ◽  
Deformation Mechanism ◽  
Elastic Limit ◽  
High Strength ◽  
High Electrical Conductivity ◽  
X Ray

This paper investigates a high electrical conductivity and high strength of alloys based on Cu-Ni-Si system It proclaimed the results of the effect of tin (Sn) component on the mechanical properties and microstructure of Cu-Ni-Sn alloy. The conditions for processing the Cu-Ni-Si alloy were presented, the analysis of microstructure and mechanical properties after heat treatment was examined by X-ray, SEM, EDS and specialized machines. The results showed that with 3% mass of Sn added into the Cu-Ni-Sn alloy along with heat treatment and deformation, the hardness value reached the range of 221-240HV, the tensile strength and elastic limit reached around 1060MPa and 903MPa respectively. However, after heat treatment and deformation for the Cu-Ni-Sn alloy based on 6% mass of Sn, the hardness value reached the range of 221-318HV, the tensile strength and elastic limit were respectively 222MPa and 263MPa higher than those of the Cu-Ni-Sn alloy with 3% mass of Sn. The result from X-ray analysis showed the deflection of peaks. Nonetheless, the new phases were not observed in SEM and EDS, contrariwise, generated modular structure was considered as the proof of the Spinodal cluster. This fact might be explained by two mechanisms: deformation mechanism and Spinodal decomposition.

scholarly journals Nanostructured 1% silver-copper composite wires with a high tensile strength and a high electrical conductivity

2019 ◽  
Vol 761 ◽  
pp. 138048 ◽  
Author(s):  
Simon Tardieu ◽  
David Mesguich ◽  
Antoine Lonjon ◽  
Florence Lecouturier ◽  
Nelson Ferreira ◽  
...  
Keyword(s):  
Electrical Conductivity ◽  
Tensile Strength ◽  
High Electrical Conductivity ◽  
High Tensile Strength ◽  
Silver Copper ◽  
Copper Composite ◽  
Composite Wires

COPPER ALLOY No. 190

Alloy Digest ◽  
1969 ◽  
Vol 18 (9) ◽  
Keyword(s):  
Thermal Conductivity ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Copper Alloy ◽  
High Strength ◽  
Heat Treating ◽  
Age Hardening ◽  
High Electrical Conductivity ◽  
Endurance Strength ◽  
Hardening Heat Treatment

Abstract Copper alloy No. 190 is an intermediate strength phosphor bronze having a combination of high electrical conductivity and endurance strength. It responds to an age hardening heat treatment offering an endurance strength of 39000 psi. It is recommended for springs, conductors, fasteners, etc. where a combination of high strength, high electrical and thermal conductivity, high resistance to fatigue and creep are required. This datasheet provides information on composition, physical properties, hardness, elasticity, and tensile properties as well as creep and fatigue. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-206. Producer or source: Copper and copper alloy mills.

scholarly journals Influence of Age Hardening Parameters on the Microstructure and Properties of the AlSi7Mg Sand Cast Alloy / Wpływ Parametrów Utwardzania Wydzieleniowego Na Strukturę I W Łaściwości Stopu Alsi7mg

2015 ◽  
Vol 60 (4) ◽  
pp. 3035-3042
Author(s):  
Ł. Poloczek ◽  
B. Dybowski ◽  
K. Rodak ◽  
R. Jarosz ◽  
A. Kiełbus
Keyword(s):  
Mechanical Properties ◽  
Heat Treatment ◽  
Electrical Conductivity ◽  
Aluminium Alloys ◽  
Cast Alloy ◽  
Age Hardening ◽  
High Electrical Conductivity ◽  
Transportation Industry ◽  
Sand Cast ◽  
Scanning Transmission

Aluminium alloys are characterized by a low density, acceptable mechanical properties and good technological properties. This unique connection of features made aluminium alloys perfect structural material for the transportation industry. Also, due to their good electrical conductivity they also found application in energy production industry. High mechanical properties and electrical conductivity of the Al-Si alloys with Mg addition may be achieved by heat treatment. However, the highest mechanical properties are achieved in the early stages of age hardening - due to precipitation of coherent phases, while high electrical conductivity may be achieved only by prolonged aging, during precipitation of semi-coherent or fully noncoherent, coarse phases. Carefully heat treated AlSi7Mg alloy may exhibit both fairly high electrical conductivity and slightly increased mechanical properties. The following article present results of the research of influence of heat treatment on the properties and microstructure of sand cast AlSi7Mg alloy. Microstructure observations were performed using light microscopy, scanning electron and scanning-transmission electron microscopy. Hardness and electrical conductivity of the AlSi7Mg alloy were investigated both in as-cast condition and after heat treatment. Maximum hardness of the alloy is achieved after solutioning at 540°C for 8h, followed by 72h of aging at 150°C, while maximal electrical conductivity after solutioning at 540°C for 48h, followed by 96h of aging at 180°C. Increase of the electrical conductivity is attributed to increasing distance between Si crystals and precipitation of semi coherent phases.

Effect of MCl (M = Na, K) addition on microstructure and electrical conductivity of forsterite

2020 ◽  
Vol 92 (1) ◽  
pp. 10901
Author(s):  
Saloua El Asri ◽  
Hamid Ahamdane ◽  
Lahoucine Hajji ◽  
Mohamed El Hadri ◽  
Moulay Ahmed El Idrissi Raghni ◽  
...  
Keyword(s):  
Heat Treatment ◽  
Electrical Conductivity ◽  
Single Phase ◽  
Sol Gel ◽  
Complex Impedance ◽  
Transmission Spectra ◽  
Electrical Measurements ◽  
Cation Type ◽  
Edx Analyses ◽  
The Fourier Transform

Forsterite single phase powder Mg2SiO4 was synthesized by sol–gel method alongside with heat treatment, using two different cation alkaline salts MCl as mineralizers (M = Na, K) with various mass percentages (2.5, 5, 7.5, and 10 wt.%). In this work, we report on the effect of the cation type and the added amount of used mineralizer on microstructure and electrical conductivity of Mg2SiO4. The formation of forsterite started at 680–740  °C and at 630–700  °C with KCl and NaCl respectively, as shown by TG-DTA and confirmed by XRD. Furthermore, the Fourier transform infrared (FTIR) transmission spectra indicated bands corresponding to vibrations of forsterite structure. The morphology and elemental composition of sintered ceramics were examined by SEM-EDX analyses, while their densities, which were measured by Archimedes method, increased with addition of both alkaline salts. The electrical measurements were performed by Complex Impedance Spectroscopy. The results showed that electrical conductivity increased with the addition of both mineralizers, which was higher for samples prepared with NaCl than those prepared with KCl.

CDA C18700

Alloy Digest ◽  
1988 ◽  
Vol 37 (1) ◽  
Keyword(s):  
Electrical Conductivity ◽  
Corrosion Resistance ◽  
Copper Alloy ◽  
Base Alloy ◽  
Heat Treating ◽  
High Electrical Conductivity ◽  
Copper Base ◽  
Screw Machine ◽  
Machine Parts ◽  
Copper Base Alloy

Abstract CDA C18700 is a copper-base alloy containing lead (nominally 1.0%). The lead is added to impart free-cutting properties to the metal. Although the lead lowers the electrical conductivity of CDA C18700 slightly below that of tough-pitch copper, it still has high electrical conductivity well within the limits needed for most current-carrying requirements. Typical uses comprise electrical motor and switch parts, electrical connectors and screw-machine parts requiring high conductivity. This datasheet provides information on composition, physical properties, hardness, elasticity, tensile properties, and shear strength. It also includes information on corrosion resistance as well as forming, heat treating, machining, and joining. Filing Code: Cu-533. Producer or source: Copper and copper alloy mills.

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