Search results

Sort By:

Limit search:

Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing

100%

Tsakiris V., Lungu M., Enescu E., Pavelescu D., Dumitrescu G., Radulian A., Mocioi N.

Acta Physica Polonica A

2014

vol. 125

issue 2

348-352

Nanostructured W-Cu-Ni electrical contact materials to be used in low voltage vacuum switching contactors for nominal currents up to 630 A were developed successfully by hot isostatic pressing. W-Cu-Ni composite powder mixtures with copper content of 20 to 40 wt% and 1 wt% Ni were mechanically alloyed in Ar atmosphere by high-energy ball milling with a ratio of milling steel balls: powders mixtures of 8:1 and rotation speed of 400 rpm for 10 and 20 h. The effect of mechanical alloying on the sintering response of composite compacts was investigated. Also, the sintered contacts were characterized from the point of view of physical, microstructural, mechanical, and functional properties. The nanostructured electrical contacts presented very good sinterability and homogeneous structures with a maximum compactity degree of about 89%. The best W-Cu-Ni compositions with relative density of about 80%, chopping currents lower than 5 A, copper content lower than 40% as W-20Cu-1Ni (10 h of mechanical alloying and 20 h of mechanical alloying) and W-30%Cu-Ni (10 h of mechanical alloying) were selected to be used in vacuum contactors.

Development of W-Cu-Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process

84%

Lungu M., Tsakiris V., Enescu E., Pătroi D., Marinescu V., Tălpeanu D., Pavelescu D., Dumitrescu G., Radulian A.

Acta Physica Polonica A

2014

vol. 125

issue 2

327-330

This study reports on the development of some W-Cu-Ni materials for use as electrical contacts for low voltage vacuum switching contactors for nominal currents up to 630 A. The contact materials with 85 wt% W, 12-14 wt% Cu and 1-3 wt% Ni were obtained by spark plasma sintering process in vacuum. From very finely dispersed W-Cu-Ni powder mixtures there were produced sintered electrical contact pieces that were investigated in terms of physical, microstructural, mechanical, and functional properties. The material sintered at 1200C exhibited a near fully dense structure with very low porosity and enhanced mechanical properties: hardness of maximum 480 HV1 and elastic modulus of maximum 220 GPa and low chopping current of maximum 1.77 A.

Refine search results

2 Acta Physica Polonica A

2 2014

2 Dumitrescu G.

2 Enescu E.

2 Lungu M.

2 Pavelescu D.

2 Radulian A.

2 Tsakiris V.

1 Marinescu V.

1 Mocioi N.

1 Pătroi D.

1 Tălpeanu D.

Search results

Nanostructured W-Cu Electrical Contact Materials Processed by Hot Isostatic Pressing

Development of W-Cu-Ni Electrical Contact Materials with Enhanced Mechanical Properties by Spark Plasma Sintering Process