Heat-insulated baffle for oriented freezing cast

Abstract

A heat isolating plate for the directionally solidified casting is composed of two or more plates for splicing them together to become a single one, an external ring matched with the internal surface of temp holding furnace tightly, and an internal ring matched with the mould casing but retaining a gap (0.5-10 mm) between them for moving the mould casing easily. Said plate is just combined hard graphite felt.

Description

technical field [0001] The invention relates to directional solidification technology, in particular to a novel high-temperature heat insulation baffle applied to directional solidification equipment. Background technique [0002] In the traditional directional solidification process, the alloy ingot is melted and cast into the mold preheated in the holding furnace. The mold is placed on the water-cooled crystallizer, and the mold is gradually pulled out of the holding furnace at a certain speed to form a higher casting. Temperature gradient, which is the key to the formation of metal directional crystal structure. In order to achieve the maximum temperature gradient, the key is to minimize the heat radiation loss from the hot zone of the holding furnace to the outer cold zone of the holding furnace, so that the heat is mainly conducted through the water-cooled crystallizer and through the surface of the mold outside the holding furnace to the outside of the holding furnace....

AI Technical Summary

Problems solved by technology

The common disadvantage of these heat insulation baffles is that the shape and size of the heat insulation baffle cannot be changed according to the shape and size of the formwork. A large amount of radiation is lost to the outside world between the hot rings, especially the heat radiated to the cooling zone seriously affects the temperature gradient between the upper and lower zones

Another disadvantage of the structure of corundum ring and molybdenum sheet is that it is inconvenient to use, requires complicated preparation process and subsequent processing to make, high cost, and difficult to make complex shapes

In addition: the corundum ring is easy to crack in high temperature use, thus affecting its heat insulation effect

Images