Nickel-titanium-chromium-silicon-calcium alloy-loaded nano gallium oxide compound modifier for heat-resisting cast iron and preparation method of compound modifier

Abstract

The invention relates to a modifier for heat-resisting cast iron, in particular to a nickel-titanium-chromium-silicon-calcium alloy-loaded nano gallium oxide compound modifier for the heat-resisting cast iron and a preparation method of the compound modifier. According to the compound modifier, by the aid of nano gallium oxide and nano silicon carbide which are loaded by multi-walled carbon nanotubes with the high thermal stability, the high specific surface area, the high strength and the high toughness, the dispersity and the activity of nano materials in melt are improved, a large quantity of non-spontaneous crystal nucleuses can be formed effectively, the graphite structure can be refined, the performance of a traditional silicon-calcium modifier is improved by nickel-titanium-chromium-silicon-calcium alloy powder, and the heat and corrosion resistance and the thermal toughness of the cast iron are improved; the nano materials and the compound alloy powder are bonded and loaded mutually, and the utilization rate of raw materials is greatly increased; and the modifier promotes the graphitization process of the cast iron and effectively improves the comprehensive mechanical properties of the heat-resisting cast iron, the heat-resisting cast iron is high in strength and low in brittleness, and compared with the traditional modifier, the compound modifier is more convenient to use and lower in production cost.

Description

technical field [0001] The invention relates to a heat-resistant cast iron modifier, in particular to a nickel-titanium-chromium-silicon-calcium alloy-loaded heat-resistant cast iron composite modifier 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 modification treatment before casting of cast...

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