阅读说明：本技术 一种Ti(C,N)固溶体结合刚玉-尖晶石质耐火材料及其制备方法 (Ti (C, N) solid solution combined corundum-spinel refractory material and preparation method thereof ) 是由 李勇 孙洋 李宏宇 薛文东 于 2019-09-03 设计创作，主要内容包括：本发明具体涉及一种Ti(C<Sub>,</Sub>N)固溶体结合刚玉-尖晶石质耐火材料及其制备方法,属于耐火材料领域。该材料按重量百分比计的原料组成为55-75％的刚玉、5-20％的电熔镁砂、1-15％的氧化钛,1-15％的金属铝,外加上述原料总量2-6％的酚醛树脂为结合剂。生产时按配比称取各种原料,混合均匀,经混炼得到泥料,然后压制成型,先在120℃-600℃下烘干5-25h,然后在1200℃-1600℃氮化气氛下烧结5-25h。该产品具有金属-非金属结合的结构,显气孔率2-15％、体积密度2.80-3.40g/cm<Sup>3</Sup>、常温耐压强度100-250MPa。本产品生产成本低,所用原料成分化学稳定性高,不含碳和易水化的碳化铝,具有很高的常温和高温强度,以及很好的抗氧化、抗热震和抗侵蚀性能。(The invention relates to a Ti (C , N) solid solution combined corundum-spinel refractory material and a preparation method thereof, belonging to the field of refractory materials, wherein the material comprises 55-75 wt% of corundum, 5-20 wt% of fused magnesia, 1-15 wt% of titanium oxide, 1-15 wt% of metal aluminum and 2-6 wt% of phenolic resin as a binding agent, in the production process, the raw materials are weighed according to the proportion, uniformly mixed, mixed to obtain a pug, then pressed and molded, dried at 120-600 ℃ for 5-25h, and then sintered at 1200-1600 ℃ in a nitriding atmosphere for 5-25 h.)

1. a refractory material of corundum-spinel combined with Ti (C _, N) solid solution is prepared from corundum (55-75 wt.%), fused magnesite (5-20), titanium oxide (1-15), aluminium metal (1-15) and phenolic resin (2-6) as binder.

2. The Ti (C _, N) solid solution bonded corundum-spinel refractory according to claim 1, wherein the corundum has a particle size of 1-3 mm, 0.1-1 mm, 0-0.1 mm, 0-0 mm, 0-1 mm, 0-0 mm, 0-0.1 mm, 0-0 mm, and 0-0.1 mm.

3. A method for preparing a Ti (C _, N) solid solution combined corundum-spinel refractory material as claimed in claim 1 or 2, characterized in that the raw materials are weighed according to the proportion, mixed uniformly, mixed to obtain a pug, then pressed to form, dried at 120-600 ℃ for 5-25h, and then sintered at 1200-1600 ℃ in a nitriding atmosphere for 5-25h to obtain the product of the invention.

Technical Field

the invention belongs to the technical field of refractory materials. In particular to a Ti (C, N) solid solution combined corundum-spinel refractory material and a preparation method thereof.

Background

Since the last 70 s, carbon composite refractory materials have been widely used in key parts of converters, electric furnaces, ladle slag lines, continuous casting systems and the like due to their excellent properties of high temperature resistance, thermal shock resistance, slag corrosion resistance and the like. In order to meet the requirements of special parts on thermal shock resistance and slag corrosion resistance, a large amount of graphite (10-20 wt%, and part of graphite reaches 30 wt%) is introduced into the traditional carbon composite refractory material (mainly magnesium carbon, aluminum carbon and zirconium carbon). For molten steel refining, the introduction of large amounts of graphite into the carbon-containing refractory material increases on the one hand the thermal conductivity of the material, while also running the risk of significant carburetion into the molten steel. In terms of energy conservation and emission reduction and the significance of smelting clean steel, the carbon content in the carbon composite refractory material must be controlled no matter in a molten steel refining or continuous casting system.

The Hongzaghuo, etc. in the research of non-oxide composite refractory material, the theory of metal-plastic phase composite refractory material and the process for realizing said material, i.e. transition-plastic phase process, are proposed. A certain amount of metal is added into the rigid inorganic oxide, and the metal changes the rigid forming of the original material into plastic forming in the material forming process, so that the blank making density is improved, and the porosity is reduced; in the sintering process, the metal phase is liquefied or softened, the pores are filled, and the metal phase reacts with the material and the ambient atmosphere to generate a non-oxide reinforced phase, so that the high-temperature strength and the thermal shock stability of the material are improved. The non-oxide has the same characteristic of being not easy to be wetted by molten steel as carbon, so that the oxide-non-oxide composite refractory material becomes a novel carbon-free refractory material for replacing the carbon composite refractory material.

Ti (C, N) is a non-oxide ceramic material with excellent performance and wide application, has the advantages of TiN and TiC, has the characteristics of high melting point, high hardness, wear resistance, oxidation resistance, corrosion resistance and the like, has good thermal conductivity, electrical conductivity and chemical stability, and has wide application in many fields of machinery, chemical engineering, automobile manufacturing, aerospace and the like. Iron-smelting workers prove that the use of the titanium-containing furnace charge is an effective means for protecting the hearth and the bottom of the furnace and prolonging the service life of the blast furnace through years of practice, and the reason is that titanium oxide is partially reduced in the iron-smelting process, so that a layer of slag crust mainly comprising TiC, TiN and Ti (C, N) is formed on the wall and the bottom of the blast furnace to play a good furnace protection role. It is thus demonstrated that Ti (C, N) can be an excellent non-oxide component in the refractory material.

Disclosure of Invention

The invention aims to prepare a Ti (C, N) solid solution combined corundum-spinel refractory material without oil immersion. The product introduces a novel non-oxide reinforcing phase Ti (C, N) into the corundum-spinel refractory material. The product has the characteristics of high strength, good thermal shock stability, good erosion resistance, long service life and the like.

The technical scheme of the invention is as follows:

The raw materials comprise 55-75% of corundum, 5-20% of fused magnesia, 1-15% of titanium oxide, 1-15% of metal aluminum, and phenolic resin accounting for 2-6% of the total amount of the raw materials as a binding agent.

The corundum particle size range is as follows: the granularity is not less than 1mm and not more than 3mm, the granularity is not less than 0.1mm and not more than 1mm, the granularity is not less than 0.1mm, and the granularity of the magnesia is as follows: the granularity is more than or equal to 0 and less than or equal to 1mm, and the granularity of the titanium oxide is as follows: the granularity is more than or equal to 0 and less than or equal to 0.1mm, and the granularity of the metal aluminum is as follows: the granularity is more than or equal to 0 and less than or equal to 0.1 mm.

the preparation method of the Ti (C, N) solid solution combined corundum-spinel refractory material is characterized by comprising the following steps: weighing the raw materials according to the proportion, uniformly mixing, mixing to obtain pug, then pressing and forming, drying at the temperature of 120-600 ℃ for 5-25h, and then sintering at the temperature of 1200-1600 ℃ for 5-25h to obtain the product.

The method is based on the transition plasticity theory, and the metal aluminum plays a role of a transition plasticity phase in the using process of the sliding plate, namely, part of the metal aluminum reacts with TiO ₂ and other raw materials in the temperature rising process of the sliding plate to generate a non-oxide reinforcing phase Ti (C, N), and the rest of the metal aluminum is used as the transition plasticity phase, so that the Ti (C, N) solid solution combined corundum-spinel refractory material which does not contain easy-to-hydrate phases Al ₄ C ₃ and AlN and does not need an oil immersion process is prepared.

Positive effects of the invention

1. The invention prepares the Ti (C, N) solid solution combined corundum-spinel refractory material by using a transition plastic phase process, and Al ₄ C ₃ and AlN which are easy to hydrate do not exist in the material, so that the material has better hydration resistance.

2. The product obtained by the invention is a metal and nonmetal combined sliding plate, wherein the free aluminum can reduce the porosity of the material and play a role of a plastic phase, and the toughness and the thermal shock stability of the material are improved.

3. As AlN and Al ₄ C ₃ are not generated in the skateboard, the skateboard has good hydration resistance and is convenient for long-term storage.

4. The product of the invention introduces novel non-oxide reinforced phase Ti (C, N) into the refractory material, and improves the erosion resistance and high-temperature strength of the material.

5. The invention has excellent physical performance indexes, the apparent porosity is 2-15%, the volume density is 2.80-3.40g/cm ³, and the normal temperature compressive strength is 100-.

Detailed Description