Production method for nucleating agent for high-strength thin-wall gray pig iron casting

Abstract

The invention discloses a production method for a nucleating agent for a high-strength thin-wall gray pig iron casting. Raw materials including, by weight percent, 65%-75% of Si, 0.5%-1% of Zr, 0.5%-1% of Re, 0%-0.5% of Al, 1.5%-2.5% of Ba, 0.5%-0.8% of Ca and the balance Fe and inevitable impurities are mixed and smelted, then alloy powder with the average grain size ranging from 200 microns to 300 microns are produced, then the alloy powder is mixed with nano silicon carbide water scattering liquid, atomizing and drying are conducted, the nano silicon carbide is doped in the alloy powder, and the nucleating agent for the high-strength thin-wall gray pig iron casting is obtained. The prepared nucleating agent has a good grain refining effect, the strength of the casting is improved, the uniformity of matrix structures of the casting can be guaranteed as well, generation of inner defects of the casting is reduced, and the nucleating agent is suitable for being applied to inoculation treatment on the high-strength thin-wall gray pig iron casting.

Description

technical field [0001] The invention relates to the technical field of casting, in particular to a production method of an inoculant for high-strength thin-walled gray iron castings. Background technique [0002] High-strength thin-walled castings such as engines need to have high strength, uniformity and compactness. To produce high-quality high-strength thin-walled castings, it is crucial to control the morphology and matrix structure of graphite formed when cast iron solidifies. Inoculation treatment is one of the most important links in the production process. By adding a certain amount of inoculant to the molten iron, a large number of crystal nuclei are formed in the molten iron to refine the grains and improve the strength, plasticity and toughness of the casting. Among them, the performance of the inoculant is crucial to the strength and uniformity of the casting. The inoculant produced by the conventional process has a limited effect on the refinement of the grain ...

AI Technical Summary

Problems solved by technology

The inoculant produced by the conventional process has a limited effect on the refinement of the grain structure of the gray cast iron matrix due to its large particle size, and the effect of improving the strength of the casting is not good; although nano-scale inoculants such as nano-silicon carbide have excellent nucleation ability, the grain The thinning effect is good, but it is not easy to be absorbed by the molten iron, and the dispersion performance in the molten iron is poor, and it is easy to collide and agglomerate and grow up, thus affecting the uniformity of the matrix structure