Manganese cobalt niobium-ferrosilicon and nano-hydroxyapatite-titanium diboride mutually loaded composite modificator for spheroidal graphite cast iron and preparation method thereof

Abstract

The invention relates to a modificator for spheroidal graphite cast iron, in particular to the manganese cobalt niobium-ferrosilicon and nano-hydroxyapatite-titanium diboride mutually loaded composite modificator for spheroidal graphite cast iron and a preparation method thereof. The modificator is prepared by the following raw materials, by weight, of 1-2 parts of nanometer titanium diboride, 2-3 parts of nano-hydroxyapatite, 2-3 parts of manganese powder, 1-3 parts of cobalt powder, 1-2 parts of niobium powder, 3-5 parts of expanded graphite powder, 1-2 parts of potassium fluoride, 4-5 parts of ferrosilicon powder with the silicon content being 45%, 0.3-0.4 part of magnesium aluminosilicate, 20-25 parts of ethanol aqueous solutions with the concentration being 5%-10% and 0.4-0.5 part of an addition agent. Nanometer powder loaded by expanded graphite powder and manganese cobalt niobium-ferrosilicon powder are mutually bonded and loaded to prepare the performance-stable composite modifier. The composite modificator is dispersed inside a material to form a stable network structure, the effect of crystal nucleus increasing is obvious, and graphite spheroidizing is efficient and stable. The modificator has a better modifying effect. Additionally, compared with a traditional modificator, using of the modificator is more convenient and faster, and the production cost is reduced.

Description

technical field [0001] The invention relates to a modifier for ball-milled cast iron, in particular to a composite modifier for ball-milled cast iron loaded with manganese-cobalt-niobium-iron-silicon alloy and nano-hydroxyapatite-titanium diboride and a preparation method thereof. Background technique [0002] Nodular cast iron refers to the cast iron with spheroidal graphite obtained by adding a modifier with spheroidizing and inoculating effects. The strength of this type of cast iron has been greatly improved, and it has excellent comprehensive performance. Class is widely used cast iron. [0003] The modifiers used in the production of ductile cast iron are directly related to the performance of the product. At present, the most commonly used modifiers are rare earth magnesium and ferrosilicon series alloys. Although these modifiers have achieved relatively good modification effects, they still have some shortcomings. , ferrosilicon series modifiers have fast melting sp...

AI Technical Summary

Problems solved by technology

[0003] The modifiers used in the production of ductile cast iron are directly related to the performance of the product. At present, the most commonly used modifiers are rare earth magnesium and ferrosilicon series alloys. Although these modifiers have achieved relatively good modification effects, they still have some shortcomings. , ferrosilicon series modifiers have fast melting speed, low nucleation rate, poor spheroidization rate, and low utilization rate of raw materials when used; and rare earth materials are also restricted by production costs; in recent years, nanomaterials have also been used as modifiers, which can be used in large quantities. Increase the number of crystal nuclei in the melt, refine the grains at the same time, and increase the density of the structure. However, due to the structural characteristics of nanomaterials, their dispersion in the melt is poor and they are easy to float. A special injection device is required to improve the Cost of production