<p class="1Body">Up-to-date science and technology requires further development and wide introduction of new high- performance processes to produce refractory metals. These may include plasma chemical technology of high dispersed powders production. Practical implementation of plasma chemical method in producing and processing of high dispersed powders is in its initial stage. Along with this at the present time the demand for processing of structural materials with improved physical and mechanical properties is now steadily increasing. Such materials have low machinability due to high hardness and durability at high temperatures which results in heavy wear of a cutting tool. To improve the efficiency when processing hard-to-cut materials it is necessary to enhance the tool’s durability; this can be provided by application of new grades of hard alloys received from tungsten nanopowders. New alloy, obtained by the new developed technology, has higher degree of hardness and wear resistance compared with existing alloys and will be intended for hard materials processing.</p>
The influence of gold, platinum, cobalt and nickel impurities on iron atoms behavior in silicon has been studied by complex methods. The additional introducing of one of the named impurities with deep levels (DL) in Fe-doped silicon was proved to reduction of the concentration of interstitial iron ( Fe 0). The introducing of gold or nickel shows the strongest effect. The presence of iron in silicon bulk in its turn is shown to decrease the DL concentration connected with Ni, Au, Co and Pt atoms correspondingly. The conclusion is drawn about iron atoms extraction onto the silicon surface in the presence of the second impurity.
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