Saint-Petersburg Mining University, Saint-Petersburg, Russia:

V. Yu. Bazhin, Head of Department of Technological Processes Automation and Production, e-mail: bazhin-alfoil@mail.ru
S. A. Savchenkov, Post-Graduate Student, Department of Metullurgy, e-mail: savchenkov.tlc@bk.ru
Ya. I. Kosov, Post-Graduate Student, Department of Metallurgy, e-mail: yaroslav_kosov@spmi.ru

An issue of improving the extruded titanium alloying elements with the purpose of the components dilution speed and completeness enhancing is discussed in the paper. Investigation of titanium alloying tablet obtained by cold extrusion has been fulfilled. Problems of the powdered titanium densing are listed and discussed. Determined were chemical compositions of titanium alloying elements from different suppliers, implemented was an estimation of mechanical strength subject to the density of tablets, obtained were the data on absorption and dilution in aluminium solutions, studied was the flux and titanium powder distribution in alloying tablet. Сomparative analysis of the alloying tablet porosity has been carried out by means of the ImageJ image analysis and processing software. Molasses has been used in the produced alloying tablet as a binder, which guarantees the flux uniform distribution throughout tablet volume with homogeneous pores formation after annealing, as distinct from the tablets of other manufacturers. The flux uniform distribution throughout tablet volume assures forming the aluminium alloy structure with the given composition of intermetallic compounds. The obtained alloying tablet possesses higher mechanical properties and demonstrates rate of dissolution in aluminium solution 15–20% higher than that of analogues. It was found that titanium powders should have improper (irregular) form and advanced surface of particles to allow pressing them at low pressures in rigid matrices and obtain products in tablets with the required porosity and strength. It was revealed that improvement of flux adhesion with titanium powder and powders compressibility is achieved by means of introducing a binder, molasses, which envelops particles and provide and additional strength of tablets on extrusion.

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