Ceramic fiber heat insulating material with which aluminum film is covered

Abstract

The invention discloses a ceramic fiber heat insulating material with which an aluminum film is covered. The ceramic fiber heat insulating material comprises a non-heated layer. The upper surface of the non-heated layer is fixedly connected with a heated layer, and the surface of the heated layer is fixedly connected with the aluminum film. The non-heated layer is prepared from following raw materials including 55% of ceramic fibers, 10% of a sol binding agent, 8% of starch, 20% of clay and 7% of cab-o-sil. The heated layer is prepared from following raw materials including 50%-55% of fireproof fibers, 10%-15% of clay, 8% of starch, 2% of an organic binding agent, 1% of an inorganic binding agent, 7% of aluminum oxide powder, 4% of emery powder, 2% of a heat insulating additive and 11% ofa sol binding agent. According to the ceramic fiber heat insulating material with which the aluminum film is covered, the materials of the heated layer are selected from the high-aluminum fireproof fibers, the aluminum oxide content reaches 60% or above, and the heat-resistance temperature of the heated layer reaches up to 1,400 DEG C; and through an aluminum oxide thin film layer arranged on thesurface of the heat insulating material, the bearing temperature of the heated layer of the heat insulating material and the melting point of aluminum oxide are equal and reach up to 2,054 DEG C, theheated layer can directly make contact with flames, and by means of a sol binding manner, rapid baking and continuous operation are facilitated.

Description

technical field [0001] The invention relates to the technical field of thermal insulation materials, in particular to a ceramic fiber thermal insulation material covered with an aluminum film. Background technique [0002] In order to improve the quality of continuous casting slab, many technical measures have been taken. Among them, in continuous casting, non-oxidation casting technology is mainly used to prevent secondary oxidation of molten steel, reduce inclusions in steel, improve the purity of molten steel and the quality of slab. In non-oxidation casting technology, its important part It is the steel flow in the tundish that is not secondary oxidized. In this process, it is often achieved by sealing casting. It is very necessary to carry out sealing protection on each sprue, temperature measuring port and contact with the tundish edge of the tundish cover. Traditional sealing materials are cast sheets, paints or plastics. These materials are easy to produce a larg...

AI Technical Summary

Problems solved by technology

These materials are easy to produce a large number of cracks at high temperature and cannot be strictly sealed, and the thermal insulation performance is not good.

Especially in the later period of use, the metal frame of the tundish cover is easy to warp and deform under long-term high temperature, resulting in further deterioration of heat preservation and sealing

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