阅读说明：本技术 一种添加铝硅合金低温烧制的铝锆碳滑板及其生产方法 (Aluminum-zirconium-carbon sliding plate added with aluminum-silicon alloy and fired at low temperature and production method thereof ) 是由 牛智旺 关斌斌 韩彦锋 李宏宇 赵臣瑞 梁保青 于 2020-07-21 设计创作，主要内容包括：本发明涉及一种添加铝硅合金低温烧制的铝锆碳滑板及生产方法,原料组成为：50％～60％的板状刚玉颗粒、10％～20％的电熔锆莫来石颗粒、5％～8％的氧化铝粉、2％～6％的石墨和/或炭黑、2％～5％的铝硅合金、3％～6％的金属硅,8％～15％的板状刚玉粉,外加上述原料总量4.0～5.5％的热固性酚醛树脂结合剂。生产时取各种原料混匀,经混练后压制成型,经干燥、还原气氛烧制而成。本发明显气孔率4.0～6.5％、体积密度3.10～3.20g/cm<Sup>3</Sup>、常温耐压强度150.0～180.0MPa、常温抗折强度30.0～36.0MPa,高温抗折强度19.0～23.0MPa；且使用效果与现有的高温烧制铝锆碳滑板相当或优。(The invention relates to an aluminum-zirconium-carbon sliding plate added with aluminum-silicon alloy and fired at low temperature and a production method thereof, and the aluminum-zirconium-carbon sliding plate comprises the following raw materials: 50-60% of tabular corundum particles, 10-20% of fused zirconia-mullite particles, 5-8% of alumina powder, 2-6% of graphite and/or carbon black, 2-5% of aluminum-silicon alloy, 3-6% of metal silicon, 8-15% of tabular corundum powder and thermosetting phenolic resin bonding agent accounting for 4.0-5.5% of the total amount of the raw materials. During production, the raw materials are uniformly mixed, pressed and formed after mixing, dried and fired in a reducing atmosphere. The invention has an apparent porosity of 4.0-6.5% and a bulk density of 3.10-3.20 g/cm 3 The normal temperature compressive strength is 150.0-180.0 MPa, the normal temperature flexural strength is 30.0-36.0 MPa, and the high temperature flexural strength is 19.0-23.0 MPa; and the using effect is similar to that of the existing high-temperature fired aluminumThe zirconium carbon slide plate is equivalent or excellent.)

1. An aluminum-zirconium-carbon sliding plate added with aluminum-silicon alloy and fired at low temperature is characterized by comprising the following raw materials in percentage by weight: 50-60% of tabular corundum particles, 10-20% of fused zirconia-mullite particles, 5-8% of alumina powder, 2-6% of graphite and/or carbon black, 2-5% of aluminum-silicon alloy, 3-6% of metal silicon, 8-15% of tabular corundum powder and thermosetting phenolic resin accounting for 4.0-5.5% of the total amount of the raw materials.

2. An Al-Zr-C skateboard according to claim 1, characterized in that the tabular corundum particles have a granulometry ranging from: the granularity is more than 1mm and less than or equal to 2mm, the granularity is more than 0.5mm and less than or equal to 2mm, the granularity is more than or equal to 1mm, and the granularity is more than or equal to 0.088mm and less than or equal to 3 and less than or equal to 0.5 mm.

3. An Al-Zr-C skateboard according to claim 2, characterized in that the weight ratio of the different particle sizes is: particle size 1: particle size 2: the granularity 3 is 15-30: 5-15: 15 to 25.

4. The aluminum zirconium carbon skateboard of claim 1 wherein the electrofused zirconium mullite grains have a grain size range of: the granularity is more than 1mm and less than or equal to 2mm, and the granularity is more than 0.5mm and less than or equal to 1mm and less than or equal to 5 mm.

5. An Al-Zr-C skateboard according to claim 4, characterized in that the weight ratio of the different particle sizes is: particle size 4: the particle size 5 is 5-15: 5 to 10.

6. The aluminum zirconium carbon skateboard of claim 1, wherein the alumina powder, carbon black particle size: less than or equal to 5 mu m, and the granularity of graphite is less than or equal to 0.088 mm; the particle sizes of the aluminum-silicon alloy, the metal silicon and the plate-shaped corundum powder are all less than or equal to 0.044 mm; the weight ratio of the graphite to the carbon black is 0-1: 1-2.

7. The aluminum-zirconium-carbon skateboard of claim 6, wherein the aluminum-silicon alloy comprises the following components by mass: 70% -80%, Si: 30 to 20 percent.

8. A method for producing an Al-Zr-C skateboard according to any of claims 1 to 7, characterized in that it comprises the following steps:

(1) weighing various raw materials according to a ratio, and putting all fine powder with the particle size of less than or equal to 0.088mm into a mixer to be uniformly mixed to obtain mixed powder for later use;

(2) adding all the granules with the granularity of more than 0.088mm into a wet mill, uniformly mixing, and adding thermosetting phenolic resin into the wet mill;

(3) uniformly wrapping the thermosetting phenolic resin on the aggregate, adding the mixed powder, mixing for 35-45 min to obtain a pug for molding, ageing the pug for 48h, and then pressing for molding to obtain a skateboard green brick;

(4) drying the green bricks in a tunnel drying kiln at the drying temperature of 200 ℃ for 48h, and then firing the green bricks for 40-50 h in the reducing atmosphere of 1000-1100 ℃;

(5) after firing, the product of the invention is prepared by oil immersion, roasting, steel hoop sleeving, grinding and surface coating.

9. The method for producing an aluminum-zirconium-carbon skateboard as recited in claim 8, wherein the concrete conditions of the ageing in the step (3) are as follows: the temperature is 20-30 ℃, and the relative humidity is 30-50%.

10. The method for producing an aluminum-zirconium-carbon skateboard as recited in claim 8, wherein the heating rate in the step (4) of firing is 25 ℃/h to 30 ℃/h.

Technical Field

The invention belongs to the technical field of refractory materials, and particularly relates to an aluminum-zirconium-carbon sliding plate added with aluminum-silicon alloy and fired at a low temperature and a production method thereof.

Background

The slide plate is a key functional element for steel making and continuous casting, and has the functions of molten steel injection and flow regulation. The sliding plate is required to bear chemical erosion, physical scouring, severe thermal shock and environmental medium erosion of high-temperature molten steel in the using process, the using condition is very harsh, and the quality reliability of the sliding plate is related to the safety of the steel-making process and must be absolutely constant. In order to increase the service life of the slider material, the refractory material is prevented from reacting with molten materials, such as liquid molten steel and slag, when it comes into contact with the molten materials. Therefore, in order to stably operate, the sliding plate should have high-temperature strength, excellent thermal shock resistance and corrosion resistance.

The current sliding plate materials mainly include refractory materials formed by combining aluminum, zirconium, carbon, aluminum carbon and other carbon materials sintered by adding metal silicon powder, and unfired aluminum carbon materials formed by adding polymethyl silane or organic silicon resin. The aluminum carbon and aluminum zirconium carbon sliding plate sintered at high temperature (about 1300-1500 ℃) needs to be sintered under the reducing atmosphere condition during preparation, so the preparation cost is high, the energy consumption is high, the pollution is serious, and the production period is long. The low high-temperature strength of the carbon-carbon combined sliding plate is a key factor influencing the service life of the sliding plate, and the carbon in the sliding plate is easy to oxidize to cause the loose structure and lower the high-temperature performance, so that the safety and reliability of the sliding plate are reduced. The unburned aluminum-carbon sliding plate can basically meet the use requirements of medium and small steel ladles and tundishes, but radial cracks are generated when the aluminum-carbon sliding plate is used on a large steel ladle due to the fact that the thermal shock resistance is not ideal enough, and the problem of short service life exists.

Disclosure of Invention

Aiming at the defects of the prior art, the invention provides the aluminum-zirconium-carbon sliding plate which is added with the aluminum-silicon alloy and is fired at the low temperature and the production method thereof, and the aluminum-zirconium-carbon sliding plate can form carbide with a network structure at the low temperature, improve the mechanical property of the sliding plate, reduce the oxidation of carbon and improve the erosion resistance and the permeation resistance.

In order to achieve the purpose, the invention adopts the technical scheme that:

an aluminum-zirconium-carbon sliding plate added with aluminum-silicon alloy and fired at low temperature comprises the following raw materials in percentage by weight: 50-60% of tabular corundum particles, 10-20% of fused zirconia-mullite particles, 5-8% of alumina powder, 2-6% of graphite and/or carbon black, 2-5% of aluminum-silicon alloy, 3-6% of metal silicon, 8-15% of tabular corundum powder and thermosetting phenolic resin accounting for 4.0-5.5% of the total amount of the raw materials.

The particle size range of the plate-shaped corundum particles is as follows: the granularity is more than 1mm and less than or equal to 2mm, the granularity is more than 0.5mm and less than or equal to 2mm, the granularity is more than or equal to 1mm, and the granularity is more than or equal to 0.088mm and less than or equal to 3 and less than or equal to 0.5 mm.

The weight ratio of different particle sizes is: particle size 1: particle size 2: the granularity 3 is 15-30: 5-15: 15 to 25.

The grain size range of the electrofused zirconium mullite grains is as follows: the granularity is more than 1mm and less than or equal to 2mm, and the granularity is more than 0.5mm and less than or equal to 1mm and less than or equal to 5 mm.

The weight ratio of different particle sizes is: particle size 4: the particle size 5 is 5-15: 5 to 10.

The granularity of the alumina powder and the carbon black is as follows: less than or equal to 5 mu m, and the granularity of graphite is less than or equal to 0.088 mm; the particle sizes of the aluminum-silicon alloy, the metal silicon and the plate-shaped corundum powder are all less than or equal to 0.044 mm; the weight ratio of the graphite to the carbon black is 0-1: 1-2.

The aluminum-silicon alloy comprises the following components in percentage by mass: 70% -80%, Si: 30 to 20 percent.

The production method of the aluminum-zirconium-carbon sliding plate comprises the following steps:

(1) weighing various raw materials according to a ratio, and putting all fine powder with the particle size of less than or equal to 0.088mm into a mixer to be uniformly mixed to obtain mixed powder for later use;

(2) adding all the granules with the granularity of more than 0.088mm into a wet mill, uniformly mixing, and adding thermosetting phenolic resin into the wet mill;

(3) uniformly wrapping the thermosetting phenolic resin on the aggregate, adding the mixed powder, mixing for 35-45 min to obtain a pug for molding, ageing the pug for 48h, and then pressing for molding to obtain a skateboard green brick;

(4) drying the green bricks in a tunnel drying kiln at the drying temperature of 200 ℃ for 48h, and then firing the green bricks for 40-50 h in the reducing atmosphere of 1000-1100 ℃;

(5) after firing, the product of the invention is prepared by oil immersion, roasting, steel hoop sleeving, grinding and surface coating.

The concrete conditions of the ageing in the step (3) are as follows: the temperature is 20-30 ℃, and the relative humidity is 30-50%.

The heating rate in the step (4) is 25-30 ℃/h.

The invention has the beneficial effects that:

1. the product of the invention is sintered at low temperature by adopting a reasonable process, is environment-friendly and energy-saving, improves the production efficiency and has higher performance than the aluminum-zirconium-carbon sliding plate sintered at high temperature. The adopted plate-shaped corundum has better mechanical strength and wear resistance, and can improve the erosion resistance and the scouring resistance of the sliding plate; the fused zirconia mullite and graphite can improve the thermal shock stability and the erosion resistance of the sliding plate at different temperatures and in the using process, and ensure the high-temperature performance of the sliding plate; the alumina micro powder can reduce the porosity and improve the density; the carbon black has higher activity and better reaction performance, and can improve the wear resistance of the sliding plate; the silicon metal can improve the oxidation resistance of the sliding plate, and the components are reasonably compounded, thereby being beneficial to improving the comprehensive use performance of the sliding plate.

2. The sliding plate added with the aluminum-silicon alloy forms a non-oxide with carbon black and graphite with higher activity in the firing process, and compared with a sliding plate added with metal silicon alone, the sliding plate can reduce the temperature for forming the non-oxide, form the non-oxide with a network structure at low temperature, form the non-oxide filled pores, reduce the porosity of the sliding plate, improve the volume density and improve the mechanical strength of the sliding plate; meanwhile, the formed non-oxide has better oxidation resistance, reduces the oxidation of carbon, and improves the erosion resistance and the permeation resistance.

3. The invention limits the granularity of each raw material, adopts different granularity and gradation combination for addition, can improve the extrusion density of the pug and achieves higher volume density and lower porosity.

4. The product of the invention has excellent physical properties: an apparent porosity of 4.0 to 6.5% and a bulk density of 3.10 to 3.20g/cm³And can resist normal temperatureThe pressure intensity is 150.0-180.0 MPa, the normal temperature flexural strength is 30.0-36.0 MPa, and the high temperature flexural strength of 1400 ℃ in a reducing atmosphere for 0.5h is 19.0-23.0 MPa. The product of the invention is higher than the industrial standard YB/T5049-2019, and the using effect is equivalent to or superior to that of the existing high-temperature fired aluminum-zirconium-carbon sliding plate.

Detailed Description

The following examples further illustrate the embodiments of the present invention in detail.

The aluminum-zirconium-carbon sliding plate has the following raw material granularity requirements:

the particle size of the tabular corundum particles includes: the granularity is more than 1mm and less than or equal to 2mm, the granularity is more than 0.5mm and less than or equal to 1mm, the granularity is more than or equal to 0.088mm and less than or equal to 3 and less than or equal to 0.5 mm;

the granularity of the fused zirconia mullite grains comprises: the granularity is more than 1mm and less than or equal to 2mm, the granularity is more than 0.5mm and less than or equal to 1mm, and the granularity is more than or equal to 5 mm;

alumina powder and carbon black granularity: less than or equal to 5 mu m, graphite granularity: the granularity is less than or equal to 0.088 mm; the granularity of the aluminum-silicon alloy, the metal silicon and the plate-shaped corundum powder is as follows: the grain size is less than or equal to 0.044 mm.