PRODUCTION METHOD OF HIGH PURITY MOLYBDENUM BY GLEBOVSKY Russian patent published in 2009 - IPC C22B34/34 C22B9/20 

FIELD: metallurgy.

SUBSTANCE: invention relates to production method of high purity molybdenum and can be used while manufacturing of high-clean molybdenum ingots, and also of sheet products made of high-clean molybdenum for usage in microelectronics, quantum electronics and electrician. Method includes vacuum refining by means of electron-beam remelt and melt crystallisation. Refining is implemented by means of two electron-beam remelting. For the first electron-beam remelting there are subject to metal-ceramic intermediates, prepared of sintered molybdenum, and it is implemented at a low rate. The second electron-beam remelting is implemented at maximum possible high rate for forming of fine-grain structure in high-clean molybdenum ingots. Ratio between diameters of molds for the first and the second remelt is d₁/d₂=0.5. Melt crystallisation is implemented in vertically supported molds of round or rectangular cross-section with receiving of cylindrical or rectangular ingots, or in horizontally supported round or rectangular molds with receiving of round or rectangular flat-shaped ingots.

EFFECT: improvement and reliability enhancement of metallurgical products (sheet products, foil paper, wire, storage plates).

2 tbl, 1 ex