Composite material for surfacing, obtained by self-propagating high-temperature synthesis

This paper presents the results of theoretical and experimental studies of the development of a composite material obtained by self-propagating high-temperature synthesis (SHS), which is used to modify a deposited alloy of the NiCrBSi system (self-fluxing alloy PG-10N-01). The source components of the composite material are powders of titanium Ti, technical carbon C, aluminum powder Al, iron oxide Fe2O3, thermosetting powder PT-NA-01, and refractory clay PGOSA-0. The mechanical activation of the charge was performed in a ball mill for 15 minutes at 130 rpm and the ratio of the mass of the charge to the mass of the grinding media was 1:40. The SHS process was initiated by heating a nichrome spiral with a diameter of 0.8 mm in an argon Ar environ ment. As a result of deposition, the layers with a dense and multiphase structure are formed. The deposited layer of PG-10N-01 alloy consists of a solid solution of nickel (gamma-Ni), boride phase Ni3B and inclusions of chromium carbide Cr3C2 and boron carbide B4C. When the synthesized composite material was added to the PG-10N-01 alloy, titanium carbide TiC and silicon carbide SiC were additionally detected in the deposited layer, which lead to an increase in the layer microhardness. The phase composition of the layer deposited from a mechanical mixture of 10 % (Ti-C-Al-SiO2-Al2O3-Fe2O3-PT-NA-01) + 90 % PG-10N-01 is a solid solution of gamma-Ni nickel, nickel boride Ni3B, titanium nitride TiN, chromium silicate CrSi, and intermetallic FeAl. The microhardness of this layer is 20 % lower than that of the PG-10N-01 alloy layer.