ARTICLE PRODUCTION FROM TITANIUM ALLOYS BY THE METHOD OF HOT ISOSTATIC PRESSING IN GLASSY-CERAMIC SHELLS WITH TITANIUM AND NIOBIUM BARRIER COATINGS

摘要

By using reactions of disproportionation in molten salts coherent titanium and niobium coatings on glassy ceramic shells have been obtained. The glassy ceramic shells with barrier coatings were used to obtain articles from a titanium alloy powder by the method of hot isostatic pressing. It was shown that compacting titanium alloys in a gasostate at a temperature of 1173 K, pressure 2000 atm and the time of pressing 4 hours allows to obtain articles easily removable from the glassy ceramic shells. The thickness of coatings after hot isostatic pressing was shown to decrease by 25-30% without the disruption of the coherence coating. In glassy ceramic shells with titanium and niobium coatings articles with a density close to the theoretical one, without any visible defects and pores were obtained and the character of the microstructure allows to refer them to the type 3-4 titanium a-alloys.