| 简介 |
FIELD : metallurgy.
SUBSTANCE : there is prepared mixture of niobium and silicon powders which is successively compressed. Compressed mixture is adjoined to an electrode containing niobium. During following vacuum-arc re-melting the mixture is merged with the electrode. The melted electrode is cooled and there is formed an ingot of alloy. The ingot is thermo-mechanically processed and annealed at 950-1150 °C facilitating at least 75 % of re-crystallisation. The ingot can be produced by melting niobium, by introduction from 0.1 to 100 ppm (part per million) of silicon into melt and by melt cooling. Cups of deep drawing and targets of ion sputtering are produced from this ingot.
EFFECT : fabrication of totally re-crystallised semi-finished product of niobium with fine and uniform by size grain.
22 cl, 11 dwg, 1 tbl, 1 ex |
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