(57) The invention relates to a casting insert fabrication method using a composition
of powders designed to produce local composite zones resistant to abrasive wear, wherein
said composite zones are reinforced with carbides and borides or with mixtures thereof
formed in situ in castings, and wherein said powder composition is characterized in that it comprises
powder reactants of the formation of carbides and/or borides selected from the group
of TiC, WC, , or mixtures thereof, said carbides and/or borides forming after crystallization
particles reinforcing the composite zones in castings, and wherein said powder composition
further comprises moderator powders in the form of a mixture of metal powders, which
after crystallization form matrix of the composite zone in casting. Furthermore, the
amount of powder reactants for the formation of TiC carbide is from 3 to 40wt% and
the amount of moderator powders is from 60 to 97wt%, the amount of powder reactants
for the formation of WC carbide is from 40 to 99wt% and the amount of moderator powders
is from 1 to 60wt%, or the amount of the mixture of powders of the reactants of the
coupled reaction of the synthesis of TiC and WC carbides is from 10 to 70wt% and the
amount of moderator powders is from 30 to 90wt%.
The invention also relates to a casting insert for the fabrication in casting of local
composite zones resistant to abrasive wear, and to a method for the fabrication of
local composite zones in castings, using for this purpose the reaction of the self-propagating
high temperature synthesis (SHS).
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