Novel die cast cap port sphere composite heating agent and production method thereof

Abstract

The invention discloses a novel die cast cap port sphere composite heating agent and a production method thereof. The novel die cast cap port sphere composite heating agent consists of spheres and sphere coatings, wherein the spheres are prepared by processing aluminum powder, sodium nitrate, ferric oxide powder, fluorite powder and bonding agent serving as raw materials; and the sphere coatings consist of acidized graphite. The production method comprises the following steps of: mixing and stirring the raw materials, pressing the raw materials into spheres, coating the spheres, and recoatingthe spheres to obtain a qualified product. According to the product obtained by the technical scheme of the invention, the spheres are basically not expanded with heating in the steelmaking casting use process, the raw material density (concentration) of the heating parts of the spheres is not changed, the heating reaction of the spheres is quick, the heating temperature can reach over 1,650 DEG C, secondary feeding effect is fully realized, the head of a casting blank forms good 'dish-shaped' shrinkage, the yield of the casting blank is improved by over 7 percent, and the content of the aluminum powder is greatly reduced so that the production cost is reduced.

Description

Novel mold-cast cap mouth sphere composite exothermic agent and production method thereof technical field The invention belongs to the technical field of metallurgical laying materials, and in particular relates to a novel die-cast cap opening sphere composite heating agent and a production method thereof. Background technique In the early 1980s, the anti-shrinkage product used for the head of the die-casting ingot in my country's metallurgical industry was a heat-preserving anti-shrinkage agent. low rate. In the 1990s, manufacturers of metallurgical auxiliary materials designed and developed powdery heat-generating anti-corrosion materials using aluminum (Al), sodium nitrate (NaNO3), iron powder (Fe2O3), wood chips, expanded graphite (acidified graphite) and other materials based on the principle of aluminothermic reaction. Shrinkage agent, referred to as heating agent. "Steel" Vol. 23, No. 6, "Anti-cratering agent for steel-making mold casting" published by Guo Baoli, S...

AI Technical Summary

Problems solved by technology

In order to solve the shortcomings of traditional exothermic agents such as significantly weakened reaction speed and low exothermic temperature after volume expansion, the purpose of the present i