Synthesis of transition metal borides layers under pulsed electron-beams treatment in a vacuum for surface hardening of instrumental steels

Abstract

The saturation of the surface layers of metals and alloys with boron is conducted for increasing their surface hardness, wear resistance, etc. Multicomponent layers containing in its composition borides of refractory metals, as a rule, are formed by the methods of chemicalthermal processing in the interaction of boriding component with refractory one or by the method of saturation of refractory metal impurities or alloy with boron. In this work, we studied the features of vanadium and iron borides formation on the surface of instrumental steels U8A and R18 under the influence of intense electron beams in continuous and pulse modes.

Synthesis and Formation of the Layers of the Vanadium Borides (Vb, V3b4, Vb2) Alloyed Die Steels Under the Influence of Electron Beams in a Vacuum

“…[3,4] Электронный нагрев непрерывным пучком в течение 2-5 минут при удельной мощности W= 5,7×10 2 Вт/мм 2 (диаметр электронного луча d=1 мм). Остаточное давление в вакуумной камере не превышало 210 -3 Па [5].…”

Solid and Liquid Synthetic Routes of Vanadium, Niobium and Titanium Nano-metal Borides

“…Metal borides like VB 2 , CrB 2 , TiB 2 , W 2 B 5 and others have been used as a coating to strengthen carbon steels to resist electronic heating with high power density in vacuum, in one case layers of vanadium boride VB 2 are coated on steel surface [7]. Niobium borides due to their high melting temperature, high strength, high thermal and electrical conductivity, high strength and high chemical stability they have been considered as an excellent candidates for high temperate applications [8,9].…”