CN110467472A - 一种连铸中间包永久层浇注料 - Google Patents

一种连铸中间包永久层浇注料 Download PDF

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CN110467472A
CN110467472A CN201910800559.5A CN201910800559A CN110467472A CN 110467472 A CN110467472 A CN 110467472A CN 201910800559 A CN201910800559 A CN 201910800559A CN 110467472 A CN110467472 A CN 110467472A
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permanent layer
continuous casting
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casting production
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胡玲军
王新杰
史佳朋
陈亮
刘丽
颜浩
任林
赵伟
刘美荣
高梅
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Beijing Lier High Temperature Materials Co Ltd
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Abstract

本发明提出了一种连铸中间包永久层浇注料，由下述重量份的原料制成：烧结莫来石颗粒70～90份，α‑Al2O3微粉3～10份，硅微粉2～8份，不锈钢纤维1～3份，防爆剂0.1～0.2份以及减水剂0.1～0.4份；防爆剂为聚丙烯纤维，减水剂为六偏磷酸钠。本发明的有益效果如下：采用硅微粉作为结合剂，不添加铝酸盐水泥，减少了氧化钙含量，提高了浇注料的高温性能，同时也提高了浇注料的烧结强度和抗热震性；同时浇注料中添加了α‑Al2O3微粉，其高温下与硅微粉发生反应生成莫来石，莫来石生成过程中伴随着浇注料体积微膨胀，既填充了耐火材料气孔，又大幅增强了浇注料的抗热震性，有效延长中间包永久层的使用寿命。

Description

一种连铸中间包永久层浇注料
技术领域
本发明涉及冶金行业耐火材料制备技术领域，特别是指一种连铸中间包永久层浇注料。
背景技术
中间包是短流程炼钢中用到的一种耐火材料容器，用于接收从钢包浇下来的钢水，在多流连铸系统中通过中间包将钢水分配至各个结晶器，是炼钢生产流程的中间环节，是由间歇操作转向连续操作的衔接点。中间包作为冶金反应器是提高钢产量和质量的重要环节，起着对钢液分流、连浇、减压以及对钢液进行保护和清除杂质的作用，对连铸操作的顺利进行及钢液品质起重要作用。
在连铸中间包内设置永久层的作用是对工作层起支撑作用，当工作层被侵蚀透时，临时替换工作层使用，同时也对隔热层起保护作用。
中间包永久层的损毁主要是由浇注料反复冷热循环导致其剥落引起的，中间包永久层不仅要长期经受1300℃以上高温作用，还要经受温度频繁波动引起的自身剥落以及翻包所产生的机械振动等。因此，中间包永久层浇注料的损毁原因主要有：1、经受急冷急热发生龟裂和剥落；2、浇注料强度低以及经受剥落后导致包璧部位倒塌。
因此，迫切要求中间包永久层浇注料具备高强、抗热震的特性，还要有较好的体积稳定性，以延长永久层的使用寿命。
发明内容
本发明提出一种连铸中间包永久层浇注料，解决了现有技术中中间包永久层浇注料强度低、抗热震性能差、使用寿命短的问题。
本发明的技术方案是这样实现的：
一种连铸中间包永久层浇注料，由下述重量份的原料制成：烧结莫来石颗粒70～90份，α-Al2O3微粉3～10份，硅微粉2～8份，不锈钢纤维1～3份，防爆剂0.1～0.2份以及减水剂0.1～0.4份。
作为优选，所述防爆剂为聚丙烯纤维，所述减水剂为六偏磷酸钠。
作为优选，所述烧结莫来石颗粒由下述重量份的烧结莫来石颗粒组成：粒径为8～5毫米的烧结莫来石颗粒15～25份，粒径为5～3毫米的烧结莫来石颗粒10～20份，粒径为3～1毫米的烧结莫来石颗粒15～25份，粒径为1～0.083毫米的烧结莫来石10～20份以及粒径为0.083～0.074毫米的烧结莫来石颗粒15～25份。
作为优选，所述烧结莫来石颗粒的密度为2.5～2.8g/cm3，其中氧化铝含量为58％～64％，氧化铁含量为0.8％～1.4％，氧化钛含量为1.8％～2.5％。
作为优选，所述α-Al2O3微粉的粒径为3微米，其中氧化铝含量为98.5％～99.5％，氧化钾或氧化钠含量为0.25％～0.45％。
作为优选，所述硅微粉的粒径大小为0.03～0.045毫米，筛余量为1％～3％，所述硅微粉中的二氧化硅含量为92％～95％，氧化铁含量为0.6％～1.1％，氧化钾或氧化钠含量为1.2％～1.5％。
作为优选，所述不锈钢纤维为采含镍铬合金元素耐热钢制成的不锈钢纤维，其规格大小为(0.1～0.2)*(0.8～1.2)*(38～42)毫米。
上述制备原料中的不锈钢纤维具备以下功效：增强产品韧性，提高抗应力-应变能力，提高抗机械冲击性；提高产品抗热震性，提高抗开裂与剥落性；抑制产品在养护、干燥及热处理后的线收缩。
本发明的有益效果为：
本发明采用硅微粉作为结合剂，不添加铝酸盐水泥，减少了氧化钙含量，提高了浇注料的高温性能，同时也提高了浇注料的烧结强度和抗热震性；同时浇注料中添加了α-Al2O3微粉，其高温下与硅微粉发生反应生成莫来石，莫来石生成过程中伴随着浇注料体积微膨胀，既填充了耐火材料气孔，又大幅增强了浇注料的抗热震性，有效延长中间包永久层的使用寿命。
主原料采用烧结莫来石，相对于使用低档矾土的永久层浇注料，体积密度更低，施工时加水量少，因此制备出的永久层浇注料强度更高，打结永久层用浇注料用量少，显著提高经济效益。
具体实施方式
下面将结合本发明实施例，对本发明实施例中的技术方案进行清楚、完整地描述，显然，所描述的实施例仅仅是本发明一部分实施例，而不是全部的实施例。基于本发明中的实施例，本领域普通技术人员在没有作出创造性劳动前提下所获得的所有其他实施例，都属于本发明保护的范围。
实施例1
一种连铸中间包永久层浇注料，由下述重量的原料制成：粒径为8～5毫米的烧结莫来石颗粒20千克，粒径为5～3毫米的烧结莫来石颗粒10千克，粒径为3～1毫米的烧结莫来石颗粒15千克，粒径为1～0.083毫米的烧结莫来石10千克，粒径为0.083～0.074毫米的烧结莫来石颗粒15千克，α-Al2O3微粉3千克，硅微粉2千克，不锈钢纤维1千克，聚丙烯纤维0.1千克以及六偏磷酸钠0.1千克。
将上述原料按照上述重量配比称重后加入混料机内干混4～5分钟，得到混合均匀的物料，将制得物料放入搅拌锅，加入洁净自来水搅拌均匀，然后振动浇注成尺寸为40mm×40mm×160mm的条状试样，自然养护24小时后脱模，在110℃下烘干24小时；干燥后的条状试样在1400℃下保温3小时，得到中间包永久层浇注料成品样块。
上述制得的中间包永久层浇注料成品样块在1400℃下烧结，保温3小时，线变化率为0.10％～0.50％，冷却后样块显气孔率20％，体积密度2.35g/cm3，常温耐压强度109MPa，常温抗折强度23.2MPa，烧结性能好，强度高。
实施例2
一种连铸中间包永久层浇注料，由下述重量的原料制成：粒径为8～5毫米的烧结莫来石颗粒24千克，粒径为5～3毫米的烧结莫来石颗粒11千克，粒径为3～1毫米的烧结莫来石颗粒17千克，粒径为1～0.083毫米的烧结莫来石11千克，粒径为0.083～0.074毫米的烧结莫来石颗粒17千克，α-Al2O3微粉6.5千克，硅微粉5千克，不锈钢纤维2千克，聚丙烯纤维0.15千克以及六偏磷酸钠0.25千克。
将上述原料按照上述重量配比称重后加入混料机内干混4～5分钟，得到混合均匀的物料，将制得物料放入搅拌锅，加入洁净自来水搅拌均匀，然后振动浇注成尺寸为40mm×40mm×160mm的条状试样，自然养护24小时后脱模，在110℃下烘干24小时；干燥后的条状试样在1400℃下保温3小时，得到中间包永久层浇注料成品样块。
上述制得的中间包永久层浇注料成品样块在1400℃下烧结，保温3小时，线变化率为0.10％～0.50％，冷却后样块显气孔率20％，体积密度2.4g/cm3，常温耐压强度115MPa，常温抗折强度23.9MPa，烧结性能好，强度高。
实施例3
一种连铸中间包永久层浇注料，由下述重量的原料制成：粒径为8～5毫米的烧结莫来石颗粒28千克，粒径为5～3毫米的烧结莫来石颗粒12千克，粒径为3～1毫米的烧结莫来石颗粒19千克，粒径为1～0.083毫米的烧结莫来石12千克，粒径为0.083～0.074毫米的烧结莫来石颗粒19千克，α-Al2O3微粉10千克，硅微粉8千克，不锈钢纤维3千克，聚丙烯纤维0.2千克以及六偏磷酸钠0.4千克。
将上述原料按照上述重量配比称重后加入混料机内干混4～5分钟，得到混合均匀的物料，将制得物料放入搅拌锅，加入洁净自来水搅拌均匀，然后振动浇注成尺寸为40mm×40mm×160mm的条状试样，自然养护24小时后脱模，在110℃下烘干24小时；干燥后的条状试样在1400℃下保温3小时，得到中间包永久层浇注料成品样块。
上述制得的中间包永久层浇注料成品样块在1400℃下烧结，保温3小时，线变化率为0.10％～0.50％，冷却后样块显气孔率20％，体积密度2.32g/cm3，常温耐压强度102MPa，常温抗折强度22.5MPa，烧结性能好，强度高。
以上所述仅为本发明的较佳实施例而已，并不用以限制本发明，凡在本发明的精神和原则之内，所作的任何修改、等同替换、改进等，均应包含在本发明的保护范围之内。

Claims (7)

1.一种连铸中间包永久层浇注料，其特征在于，由下述重量份的原料制成：烧结莫来石颗粒70～90份，α-Al2O3微粉3～10份，硅微粉2～8份，不锈钢纤维1～3份，防爆剂0.1～0.2份以及减水剂0.1～0.4份。
2.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述防爆剂为聚丙烯纤维，所述减水剂为六偏磷酸钠。
3.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述烧结莫来石颗粒由下述重量份的烧结莫来石颗粒组成：粒径为8～5毫米的烧结莫来石颗粒15～25份，粒径为5～3毫米的烧结莫来石颗粒10～20份，粒径为3～1毫米的烧结莫来石颗粒15～25份，粒径为1～0.083毫米的烧结莫来石10～20份以及粒径为0.083～0.074毫米的烧结莫来石颗粒15～25份。
4.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述烧结莫来石颗粒的密度为2.5～2.8g/cm3，其中氧化铝含量为58％～64％，氧化铁含量为0.8％～1.4％，氧化钛含量为1.8％～2.5％。
5.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述α-Al2O3微粉的粒径为3微米，其中氧化铝含量为98.5％～99.5％，氧化钾或氧化钠含量为0.25％～0.45％。
6.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述硅微粉的粒径大小为0.03～0.045毫米，筛余量为1％～3％，所述硅微粉中的二氧化硅含量为92％～95％，氧化铁含量为0.6％～1.1％，氧化钾或氧化钠含量为1.2％～1.5％。
7.根据权利要求1所述的一种连铸中间包永久层浇注料，其特征在于，所述不锈钢纤维为采含镍铬合金元素耐热钢制成的不锈钢纤维，其规格大小为(0.1～0.2)*(0.8～1.2)*(38～42)毫米。
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