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Abstract
Abstract. The studies are devoted to the infl uence of nanopowders produced by plasma chemical method and self-propagating hightemperature synthesis (SHS) on service characteristics of grey cast iron SCh20 at intra-mold modifi cation. Modifi ers (I) in iron matrix of the composition (ά-Fe, TiCxNy , SiC) from natural raw material (titano-magnetite) have been produced by plasma chemical method at the interaction of titano-magnetite powder and methane in the fl ow of hydrogen-nitrogen plasma. Modifi ers of the composition II on conversion to carbides (70 ‒ 80 % WC ÷ 20 ‒ 30 % TiC) with zirconium as metal-protector have been produced by SHS method combined with mechanochemical method. The usage of modifi er I in the amount of 0,002 % increases Brinell hardness by 9,8 %, ultimate tensile strength – by 11,9 %, relative wear resistance – by 21 %, corrosion resistance in hydro-chloric acid – by 12,3 % as compared with check (unmodifi ed) sample of cast iron. The usage of modifi er II in the amount of 0,038 % increases Brinell hardness by 13,1 %, ultimate tensile strength – by 19,8 %, relative wear resistance – by 69 %, corrosion resistance in hydrochloric acid – by 28 %.
Highlights
The studies are devoted to the influence of nanopowders produced by plasma chemical method and self-propagating hightemperature synthesis (SHS) on service characteristics of grey cast iron SCh20 at intra-mold modification
Modifiers of the composition II on conversion to carbides (70 ‒ 80 % WC ÷ 20 ‒ 30 % TiC) with zirconium as metal-protector have been produced by SHS method combined with mechanochemical method
THE STUDY OF THE INFLUENCE OF MODIFIERS PRODUCED BY PLASMA CHEMICAL AND SHS METHODS ON SERVICE CHARACTERISTICS OF GREY CAST IRON
Summary
Исследовали влияние нанопорошков, полученных методами плазмохимическим и самораспространяющегося высокотемпературного синтеза (СВС), на служебные характеристики серого чугуна СЧ20 при внутриформенном модифицировании. Цель настоящей работы – исследование влияния наноразмерных модификаторов, полученных плазмохимическим и СВС методами, на эксплуатационные характеристики серого чугуна при внутриформенном модифицировании. Ниже приведены состав и свойства модификаторов с различными металлами-протекторами, полученных комбинированным методом (СВС плюс механохимический): Для исследования процессов модифицирования производили выплавку синтетического серого чугуна марки СЧ20 в индукционной печи ОКБ-281 с кислой футеровкой (кварц и 3 % борной кислоты) и емкостью тигля 750 кг. Размер частиц смеси карбидов вольфрама и титана, полученных методом СВС, на основании данных сканирующей электронной микроскопии составляет менее 100 нм Обработанных модификатором II (получен комбинированным методом), зафиксировано увеличение твердости на 13,1 %, временного сопротивления на разрыв – на 19,8 % по сравнению с контрольным (немодифицированным) чугуном.
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