Some physical–chemistry aspects of obtaining of Cr–Cu compositions for electrotechnical designation

 
R.Minakova,
 
N.Lesnik,
 
A. A.Khomenko
 

I. M. Frantsevich Institute for Problems of Materials Science of the NAS of Ukraine, Krzhizhanovsky str., 3, Kyiv, 03142, Ukraine
Electrical Contacts and Electrodes - Kiev: Frantsevich Institute for Problems of Materials Science NASU, 2010, #10
http://www.materials.kiev.ua/article/473

Abstract

The average size growth of refractory particles in the liquid-phase sintering at temperature 1200 оC under vacuum (2–4)10-3 Pа of Cr–Cu composition with particle volume fraction from 40 to 70% has been studied . For determining the average particle size are used the methods, based at the analysis of the particle 2-dimension size distribution in the (method of chords) and particle 3-dimension size distribution (statistical reconstruction by Shale- Saltukov method). The average size particle kinetics is described by exponential function with the exponent, close to 3, which corresponds to the diffusion controlled growth in the framework in Lifschits– Slеzov–Wagner theory. It is shown that the growth rate constant is the characteristic, sensitive to the procedure of the determination of average particle diameter. The influence of the volume fraction on particles growth kinetics corresponds to the Ardell’model.


ARDELL’MODEL, COMPOSITIONS OF CR–SU, LIFSCHITZ–SLЕZOV–WAGNER THEORY, LIQUID PHASE SINTERING, PARTICLE GROWTH KINETICS, STATISTICAL RECONSTRUCTION OF 3-DIMENSION SIZE DIS