Composite heat resistant cast iron alternate with chromium tantalum tungsten-silicon calcium alloy loaded with nano erbium oxide and nano boron nitride and preparation method of composite heat resistant cast iron alternate

Abstract

The invention relates to a heat resistant cast iron alternate, in particular to a composite heat resistant cast iron alternate with a chromium tantalum tungsten-silicon calcium alloy loaded with nano erbium oxide-boron nitride and a preparation method of the composite heat resistant cast iron alternate. The composite alternate improves the dispersibility and the activity of a nano material in a solution through the nano erbium oxide and the nano boron nitride which are high in heat stability, specific surface area, strength and tenacity and loaded with multiwalled carbon nanotubes, and erosion is not prone to occurring; chromium tantalum tungsten-silicon calcium alloy powder improves the performance of a conventional silicon calcium alloy alternate, and the tenacity and the heat oxidization resistance of cast iron are improved; the nano material and the composite alloy powder are mutually bonded and loaded, the utilization rate of raw materials is extremely increased, the graphitization process of the cast iron is promoted through the alternate, the comprehensive mechanical performance of the heat resistant cast iron is effectively improved, and an obtained casting is compact, resistant to corrosion and abrasion, and good in heat stability; and compared with a conventional alternate, the alternate is more convenient and faster to use, and the production cost is lower.

Description

technical field [0001] The invention relates to a modifier for heat-resistant cast iron, in particular to a composite modifier for heat-resistant cast iron with chromium-tantalum-tungsten-silicon-calcium alloy loaded with nanometer erbium oxide-boron nitride 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 tak...

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