A blast furnace ceramic mug with al 2 oc-aln solid solution bonded corundum refractory material and preparation method

Abstract

Al for a blast furnace ceramic mug 2 The invention relates to an OC-AlN solid solution combined corundum refractory material and a preparation method thereof, belonging to the field of refractory materials. The raw material composition is 57% corundum particles with a particle size of 1-3mm, 13% corundum particles with a particle size of 550-600μm, 6-26% corundum fine powder with a particle size of 38-45μm, and 3-18% metal with a particle size of 38-45μm Aluminum powder, 1‑6% silicon nitride powder with a particle size of 38‑45 μm, plus 2‑6% binder phenolic resin by the total weight of the above raw materials, and the content of metal aluminum is 3 times that of silicon nitride. When preparing, weigh various raw materials according to the formula, mix them evenly and knead to obtain mud, then press and shape, first dry at 200°C for more than 12 hours, and then raise the temperature to 550-650°C for 6-10 hours under a nitrogen atmosphere, and then Sinter at 1500-1700°C for 3-6h. The obtained product has an apparent porosity of 9-14%, and a bulk density of 2.90-3.10g / cm 3 , Normal temperature compressive strength 260-340MPa. The raw material of this method has high chemical stability, does not contain carbon and easily hydrated AlN and Al 4 C 3 , low equipment requirements, successfully prepared Al 2 OC‑AlN solid solution combined with corundum refractory material can be mass-produced.

Description

technical field [0001] The invention belongs to the field of refractory materials. Be specifically related to a kind of Al 2 OC-AlN solid solution bonded corundum refractory material and its preparation method. Background technique [0002] Blast furnace ironmaking is the main method of ironmaking. Blast furnace refractory materials will not only be eroded by molten iron and slag during use, but also by gaseous phases such as alkali steam and carbon monoxide. At the same time, the progress of ironmaking technology and the improvement of blast furnace smelting intensity have put forward new requirements for blast furnaces. In order to reduce maintenance costs and avoid economic losses caused by shutdown, the blast furnace needs to achieve longevity. [0003] The ceramic cup hearth bottom structure of blast furnace composed of ceramic cup and carbon brick is a new hearth bottom structure developed after the comprehensive furnace bottom structure and water-cooled carbon bric...

AI Technical Summary

Problems solved by technology

Early research through high temperature hot pressing AlN, Al 4 C 3 and Al 2 o 3 A powder mixture for the synthesis of Al 2 OC-AlN solid solution, high temperature and high pressure synthesis conditions and AlN and Al 4 C 3 The ease of hydration limits its industrial production

Current studies have shown that resin-bonded Al-Al 2 o 3 Composite materials can obtain Al under the condition of high temperature nitrogen 2 OC-AlN solid solution, but Al with poor high temperature stability exists in the product 4 o 4 C

And nitrogen is the only nitrogen source, it is difficult to achieve uniform nitriding and Al 2 Synthesis of OC-AlN Solid Solution

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