Composite modifier, prepared through mixed loading of aluminum-antimony-copper-ferrosilicon alloy and nanometer magnesium oxide-boron nitride, for gray pig iron and preparation method of composite modifier

Abstract

The invention relates to a composite modifier, prepared through mixed loading of aluminum-antimony-copper-ferrosilicon alloy and nanometer magnesium oxide-boron nitride, for gray pig iron and a preparation method of the composite modifier. The modifier is prepared from the following raw materials in parts by weight: 1-2 parts of nanometer magnesium oxide, 2-3 parts of nanometer boron nitride, 1-3 parts of aluminum powder, 0.8-1 parts of antimony powder, 3-5 parts of expansible graphite powder, 3-4 parts of copper powder, 4-6 parts of silicon iron powder with 45% of silicon content, 0.2-0.3 part of aluminum-magnesium silicate, 20-25 parts of ethanol water at the concentration of 5-8%, and 0.4-0.5 part of an additive. The nano-powder and the manganese-molybdenum-copper-ferrosilicon alloy powder loaded on the expansible graphite powder are mutually bonded and loaded to prepare the composite modifier with stable properties, the effect of promoting generation of crystal nucleus and refining the crystal nucleus is achieved, the composite alloyed powder optimizes the matrix structure, refines the graphite body and improves the strength, the modifier is rapidly melted after being added into the molten iron, the graphitization process is promoted, the comprehensive mechanical property of the gray pig iron is effectively improved, and compared with the traditional modifier, the composite modifier is more convenient to use, and the production cost is also reduced.

Description

technical field [0001] The invention relates to a modifier for gray cast iron, in particular to a composite modifier for gray cast iron with aluminum antimony copper-ferrosilicon alloy loaded with nano magnesium oxide-boron nitride and a preparation method thereof. Background technique [0002] Gray cast iron refers to cast iron with flake graphite, and it is also the most widely used type of cast iron in industrial production. It has good casting performance, and is excellent in vibration reduction, wear resistance, cutting processing and notch sensitivity. , but because the flake graphite in gray cast iron severely splits the matrix, making its mechanical properties poor, improving the strength of gray cast iron is also a problem that needs to be solved urgently in the industry. [0003] At present, the main method to improve the strength of gray cast iron is to add a certain amount of alloying elements such as chromium, molybdenum, nickel, copper and rare earth as modifie...

AI Technical Summary

Problems solved by technology

[0002] Gray cast iron refers to cast iron with flake graphite, and it is also the most widely used type of cast iron in industrial production. It has good casting performance, and is excellent in vibration reduction, wear resistance, cutting processing and notch sensitivity. , but because the flake graphite in gray cast iron severely splits the matrix, making its mechanical properties poor, improving the strength of gray cast iron is also a problem that needs to be solved urgently in the industry

[0003] At present, the main method to improve the strength of gray cast iron is to add a certain amount of alloying elements such as chromium, molybdenum, nickel, copper and rare earth as modifiers during the smelting process to refine the crystal nuclei and increase the number of crystal nuclei, thereby improving the structural strength. Although this method can improve the strength of gray cast iron, it is restricted by factors such as low utilization rate of raw materials and high production cost; in recent years, the use of nanomaterials as modifiers has also emerged, which can greatly increase the number of crystal nuclei in the melt and refine the grains at the same time , to increase the density of the tissue, but 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 the production cost