Composite alterant for nickel aluminum manganese-silicon calcium alloy loaded nano-zirconia-tantalum nitride heat resisting cast iron and preparation method thereof

Abstract

The invention relates to an alterant for heat resisting cast iron, in particular to the composite alterant for the nickel aluminum manganese-silicon calcium alloy loaded nano-zirconia-tantalum nitride heat resisting cast iron and a preparation method thereof. According to the composite alterant, by means of nano-zirconia and nano titanium diboride which are loaded by a multi-walled carbon nanotube with high thermal stability, high specific surface area, high strength and high toughness, the dispersity and activity of a nano material in melt liquid are improved, a premeditated crystal nucleus can be formed effectively, and graphitizing is facilitated; performance of a traditional silicon calcium alterant is improved through nickel aluminum manganese-silicon calcium alloy powder, and the toughness and high thermal stability performance of the cast iron are improved; the nano material and the composite alloy powder are bonded and loaded mutually, so that the utilization rate of raw materials is greatly increased, the graphitizing process of the cast iron is facilitated through the alterant, the comprehensive mechanical property of the heat resisting cast iron is improved effectively; the impact toughness and strength of an obtained casting both are improved, and the organization is refining and compact; and compared with the traditional alterant, using is more convenient and fast, and the production cost is lower.

Description

technical field [0001] The invention relates to a heat-resistant cast iron modifier, in particular to a nickel-aluminum-manganese-silicon-calcium alloy loaded nano-zirconia-tantalum nitride composite modifier for heat-resistant cast iron and a preparation method thereof. Background technique [0002] Heat-resistant cast iron refers to cast iron used under high temperature conditions. National standards are mainly divided into three types of heat-resistant cast iron: chromium, silicon and aluminum. This type of cast iron has anti-oxidation and anti-growth properties. The increase in service temperature has higher requirements on the performance of the existing heat-resistant cast iron. The existing problems of the current heat-resistant cast iron are mainly manifested in poor thermal conductivity, poor thermal shock resistance, high brittleness, high scrap rate, short service life, etc. In order to solve these problems, it is particularly important to take effective modificat...

AI Technical Summary

Problems solved by technology

[0002] Heat-resistant cast iron refers to cast iron used under high temperature conditions. National standards are mainly divided into three types of heat-resistant cast iron: chromium, silicon and aluminum. This type of cast iron has anti-oxidation and anti-growth properties. The increase in service temperature has higher requirements on the performance of the existing heat-resistant cast iron. The existing problems of the current heat-resistant cast iron are mainly manifested in poor thermal conductivity, poor thermal shock resistance, high brittleness, high scrap rate, short service life, etc. In order to solve these problems, it is particularly important to take effective modification treatment before casting of cast iron. At present, alloy elements such as silicon, aluminum, calcium, copper, titanium, niobium and rare earth are used as modification agents to refine the crystal nucleus. , increase the number of crystal nuclei, promote graphite spheroidization, increase density, and improve high-temperature mechanical properties. However, in actual use, there are constraints such as low raw material utilization and high production costs. In recent years, nanomaterials have been used as modifiers. However, due to Due to the structural characteristics of nanomaterials, their dispersion in the melt is poor, and they are easy to float, requiring auxiliary special injection devices, which increases production costs