SU353787A1 - EXOTHERMIC MIXTURE - Google Patents

Description

The invention relates to metallurgy, in particular, to compositions of mixtures used to insulate profitable extensions during steel casting. The following composition of the exothermic coating of profitable extensions is known, weight. h .: Aluminum powder19 Oxidizing agent5 Refractory clay15 Chamotte powder29 Sawdust 1 Binder8 However, this mixture has insufficient heat release, which leads to ingot rejects. The purpose of the present invention is to increase the exothermic capacity of the mixture in order to reduce the head trim of the ingot. The proposed mixture differs from that known in that it contains a multicomponent calcium-manganese-silicon-aluminum alloy powder as a combustible component in the following ratio, wt. h .: Calcium-manganese-silicon-aluminum alloy powder 12-14 10-12 Refractory clay 26-28 Shamot 2-3 Wood impediments 20-20,5 Binder It is proposed to use scale as an oxidant, chamotte is used in the form of chamotte mortar. The binder can be used with an aqueous solution of sulphite liquor. The technology of preparation of the coatings from the proposed mixture is as follows: all solid components of the mixture are mixed in a sweeper and then an aqueous solution of sulfite liquor with a density of 1.25 is added. The prepared mixture is applied to the hot lined surface of the profitable extension in two layers with a thickness of 15-20 mm. The subject was also invented an Exo-thermal mixture for coating profitable extensions, including aluminum powder, an oxidizer, refractory clay, chamotte, sawdust, a binder, because, in order to extract heat, it is capable of improving the quality of the ingot. as a combustible component, calcium-manganese-silicon-aluminum 3 alloy powder was introduced, in the following ratio of nanowires, weight. including: Calcium-aluminum-manganese-silicon-aluminum alloy powder 12-compo-Aluminum powder 10-12 14 Owing 20-20,5 35378: 4 Oxidizer34-36 Refractory clay10-12 Shamot26-28 5Wood sawdust2-3