Investigation of the amount influence of the “Carbonxide” additive on the properties of silicon carbide refractories on the nitride-silicon-containing binder after firing at a temperature of 1450 °C in a nitrogen gas medium

Abstract

The amount influence of the “Carbonxide” additive on the properties of pressed silicon-carbide products on the nitride-silicon-containing binder has been studied. The optimal amount of the indicated additive was established.
 On the basis of carried out studies, it can be concluded that, along with the addition of ferrosilicon and petroleum coke, in the manufacture of carbide-silicon products on a nitride-silicon-containing binder with a thickness of more than 50 mm, the “Carbonxide” additive can be used.
 The use of the “Carbonxide” additive instead of the addition of ferrosilicon and petroleum coke as part of the refractory batch contributes to the creation of microporous structure of the material and the binder formation of multiphase composition (Si3N4, β-sialon, β-SiC, AlN), which generally increases the refractory strength.
 Products with the “Carbonxide” addition in the amount of 2.5 % (in excess of 100 %) are characterized by the following indicators of physico-chemical properties: content, mass %: SiC — 71.0, Si residual— 0.41, N — 7.15; cold crushing strength — 216.0 N/mm2, open porosity — 16.8 %, apparent density — 2.58 g/cm3, refractoriness under load 0.2 N/mm2 —> 1700 оC and meet the requirements of the technical conditions for the brand KKNK.