Hot-pressed ceramic refractory material for thin-strip continuous casting side sealing plate and preparation method of hot-pressed ceramic refractory material
A technology of refractory materials and side sealing plates, which is applied in the field of ceramic refractory materials, can solve the problems of affecting the thermal shock resistance of side sealing plates, affecting the edge quality of thin strips, and large thermal expansion coefficients, achieving excellent corrosion resistance to molten steel, excellent resistance to Erosion performance of molten steel, effect of small thermal conductivity
Active Publication Date: 2014-02-12
武汉钢铁有限公司
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Problems solved by technology
At present, the domestically produced side sealing plate products have disadvantages such as low high temperature strength, easy wear, high thermal expansion rate, and high thermal conductivity.
Internationally commercialized side seals are mainly BN-ZrO supplied by ESK. 2 -Composite ceramics of SiC system, but BN-ZrO
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[0028] The preparation method of the hot-pressed ceramic refractory material of the steel thin strip continuous casting side sealing plate in the above-mentioned embodiments 1-14 comprises the following steps:
[0029] 1) Weigh the nitrides and fillers by mass percentage;
[0030] 2) Mix the nitride and filler, then mix with ethanol or acetone or distilled water with a volume fraction of 70-100% in a weight ratio of 1:1-5, then add a ceramic ball mill, and ball mill for 6-40 hours to obtain a mixed powder;
[0031] 3) Dry the mixed powder at 80-140°C for 10-30 hours. The dried powder should be crushed, granulated and sieved to obtain pellets, and the particle size of the pellets is 1-20 μm for later use;
[0032] 4) The pellets are hot-pressed and sintered at a temperature of 1500-2000 ° C, a pressure of 10-100 MPa, vacuum or nitrogen or argon to obtain a blank, which is then cut and ground to obtain a hot-pressed ceramic refractory product.
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The invention discloses a hot-pressed ceramic refractory material for a thin-strip continuous casting side sealing plate and a preparation method of the hot-pressed ceramic refractory material. The hot-pressed ceramic refractory material comprises the following raw materials in percentage by mass: 55 to 96 percent of nitride and 4 to 45 percent of filler, wherein the filler is one or more of oxides, oxynitrides, carbo-nitrides and borides. The method comprises the following steps of mixing the nitride with the filler, mixing a mixture with 70 to 100 mass percent of ethanol, acetone or distilled water according to a weight ratio of 1:(1-5), adding ceramic ball millstone, and performing ball milling for 6 to 40 hours to obtain mixed powder; crushing the dried powder, and performing granulation and sieving to obtain spherical particles for later use; carrying out hot pressing and sintering on the spherical particles to obtain a blank, and cutting and grinding the blank to obtain a hot-pressed ceramic refractory material product. According to the hot-pressed ceramic refractory material and the preparation method, the key technical problems of short service life and poor reliability of a side sealing plate material in thin-strip continuous casting production can be solved, the efficient, continuous and stable production requirements of thin-strip continuous casting can be met, and the wide application and popularization of a novel thin-strip continuous casting process are promoted.
Description
technical field [0001] The invention relates to a ceramic refractory material, in particular to a high-strength thermal shock and wear-resistant ceramic refractory material in direct contact with molten metal or molten steel, and more specifically to a steel strip continuous casting side seal A hot-pressed ceramic refractory material for a plate and a preparation method thereof. Background technique [0002] Thin strip continuous casting of steel is a cutting-edge technology in the field of metallurgy. It has fundamentally changed the traditional production process of thin steel in the iron and steel industry. The development trend of today's steel industry has attracted widespread attention from the world's steel companies. It is one of the most important keys to realize this advanced technology to provide side-sealing plate refractories that can meet the requirements of thin strip continuous casting process and have reliable performance. [0003] The refractory material ...
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Inventor 宋仪杰蒋扬虎周桂峰刘继雄何明生刘孟刘黎张洪雷洪学勤雷中兴
Owner 武汉钢铁有限公司
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