A dense high-strength sialon bonded iron channel castable and its manufacturing method

Abstract

The invention discloses a compact high strength SiAlON combined iron runner castable and a manufacture method thereof. The compact high strength SiAlON combined iron runner castable comprises the following components by mass ratio: 20-40 parts of electric smelting compact corundum, 5-20 parts of brown aluminum oxide, 4-12 parts of silicon carbide, 4-6 parts of graphite, 1-7 parts of silicon oxide powder, 4-6 parts of ferro-silicon nitride, 5-10 parts of Al4SiC4 powder, 2-6 parts of silica sol, and 0.54-2 parts of metal aluminum powder. The compact high strength SiAlON combined iron runner castable has the beneficial effects that ferro-silicon nitride and Al4SiC4 powder generate SiC through chemical reaction at high temperature, and along with the rise of thermal treatment temperature, the reaction is intensified obviously, so that the apparent porosity of the product is obviously lowered, the product obtains high compact structure, is obviously improved in slag corrosion resistance and molten iron scouring resistance, and improves once iron flux; the silica sol is taken as a binding agent, the generated fibrous SiAlON enhances the stability of the structure and improves the thermal shock resistance of the castable.

Description

【Technical field】 [0001] The invention relates to the field of refractory material manufacturing, in particular to a compact high-strength SiAlON bonded iron trench castable and a manufacturing method thereof. 【Background technique】 [0002] my country is a big steel producing country in the world and consumes a lot of refractory materials. The general requirements for refractory materials for domestic large and medium-sized blast furnace tapping channels are: high temperature resistance, corrosion resistance, erosion resistance, penetration resistance, and high thermal conductivity. Al 2 o 3 -SiC-C castables are generally composed of refractory aggregates, powders, binders, admixtures, water or other liquid materials, and can be formed by vibratory casting, self-flowing casting, etc. at the site of use, and can also be made into prefabricated parts. At present, in the castables commonly used in China, the content of SiC is about 15% to 25%. However, in recent years, with...

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Problems solved by technology

Al 2 o 3 -SiC-C castables are generally composed of refractory aggregates, powders, binders, admixtures, water or other liquid materials, and can be molded by vibration casting, self-flowing casting, etc. at the site of use, and can also be made into prefabricated parts. At present, in the castables commonly used in China, the content of SiC is about 15% to 25%. However, in recent years, with the popularization of blast furnace intensified smelting, the problem of the decline in the spalling resistance of iron trench castables due to SiC oxidation has been compared. outstanding, and the performance of slag erosion resistance, molten iron erosion resistance, strong thermal shock stability, etc. is also poor, and it is difficult to meet production needs