共查询到19条相似文献,搜索用时 109 毫秒
1.
铝镁尖晶石炭钢包砖的研制 总被引:2,自引:0,他引:2
在高铝质材料基质中加入MgO粉,并添加适量的碳素材料及抗氧化剂,研制出了铝镁尖晶石炭钢包砖。该铝镁尖晶石炭砖质量稳定,在太钢第二炼钢厂70t钢包上使用两年多来,包龄基本上稳定在75次左右,并且使用过程中侵蚀均匀,与打结包相比,挂渣少,无剥落。 相似文献
2.
盛钢桶用优质不烧铝镁炭砖的研制目前我国钢包中普遍采用的是铝镁不烧砖及铝镁炭不烧砖,尤其是铝镁炭不烧砖具有较好的抗渣能力和抗热震性,克眼了钢水和渣的渗透引起的结构剥落现象,使用寿命明显提高。但铝镁炭不烧砖具有抗氧化性较差,以及导热过快引起的钢包粘渣等缺... 相似文献
3.
盛钢桶用不烧镁铝尖晶石炭砖的研制及使用随着炼钢技术的发展,盛钢桶除了作为盛钢容器外,还兼有二次精炼等功能。由于出钢温度的升高,钢水滞留时间延长,钢液沸腾与气体搅拌作用,使用条件越来越苛酷,使传统的粘土衬砖、高铝材砖、铝镁砖等内衬寿命大幅度下降。为了寻... 相似文献
5.
6.
7.
8.
矾土-尖晶石钢包不烧砖的蚀损研究 总被引:4,自引:0,他引:4
研究了矾土-尖晶石钢包不烧砖使用后的结构变化。结果表明:矾土-尖晶石银包不烧砖损毁的主要原因是炉渣对砖的侵蚀和结构变化引起的剥落 相似文献
9.
10.
11.
《Ceramics International》2021,47(22):31407-31412
The magnesia-carbon bricks are used at the ladle slag line adds carbon to molten steel and thus has an adverse effect on the smelting process. Steel production enterprises hope to remove carbon from the ladle slag line. This study presents a Silica sol (SS)–magnesium aluminate spinel(MA) coating that can be applied to the surfaces of periclase–MA spinel brick (spinel brick) to improve their slag erosion resistance, facilitating the elimination of carbon from the ladle slag line. The slag corrosion resistance mechanism of a spinel brick covered with the SS–MA coating was analyzed through scanning electron microscopy and simulation using FactSage software. The results show that increasing the SS content (CSS) led to the formation of fine cracks during the coating-drying process and was detrimental to the slag erosion resistance of the coating. The optimum CSS was 20%. In the high-temperature slag erosion experiment, the MA in the coating was capable of forming solid solutions with Fe and Mn in the slag, and the nano-SiO2 in the coating interacted with the slag, increasing the viscosity of the slag and reducing its penetration. In addition, the presence of the coating extended the penetration path of the slag and reduced the contact area between the slag and the spinel brick and their chances to undergo chemical reactions, thereby protecting the spinel brick from slag erosion. The coated spinel bricks outperformed the magnesia-carbon brick in terms of slag erosion resistance, providing a basis for selecting carbon-free refractory materials for the ladle slag line. 相似文献
12.
铁水包内衬材料长期服役于间隔周期较长的高、低温交替环境,极易发生剥落与侵蚀损毁。为了探索影响铁水包内衬材料使用寿命的主要因素,对市面上四种铁水包Al2O3-SiC-C内衬砖的化学成分、物相组成、物理性能和微观结构进行了分析,并以高炉渣为侵蚀介质,重点研究了不锈钢冶炼用铁水包Al2O3-SiC-C内衬砖的侵蚀机理。结果表明:铁水包Al2O3-SiC-C内衬砖中Al2O3含量越高,高温下制品的液相量越低,越有利于提高耐火砖的高温力学性能;随着含碳量的增加,铁水包Al2O3-SiC-C内衬砖的抗渣性得到明显改善,但抗氧化性及高温抗折强度呈下降趋势;高炉渣中CaO、MgO向耐火砖中渗透,与耐火砖中的Al2O3、SiO2发生反应形成高熔点的镁铝尖晶石及低熔点的钙长石等,生成的低熔相会加剧耐火砖的侵蚀。 相似文献
13.
The manufacture of clean steel needs high performance carbon-free bricks for ladle lining.Based on long term application experiences of the prefab Al2O3-MgO blocks,unburnt Al2O3-MgO brick has been developed by pressing a mix of alumina,spinel and magnesia as major raw materials and Al2O3-MgO gel powder as binder.In addition to low open porosity and high strength,the unburnt Al2O3-MgO brick shows superior corrosion resistance and thermal shock resistance to the prefab block.Field trials in a 300t steel ladle have indicated the residual lining of unburnt Al2O3-MgO bricks showed smooth surface without large spalling and seldom steel infiltration,consequently longer service life than the prefab blocks.The reliable,unburnt Al2O3-MgO bricks have more advantages of high efficiency,energy-saving and eco-friendly production.It will be one of the best options for ladle lining in the manufacture of high-purity steel. 相似文献
14.
15.
16.
The residual expansion of in-situ spinel formation in using of alumina-magnesia-carbon(AMC)bricks monolizes the lining of steel-making ladles with the closure of their joints,which has been an effective solution avoiding washing out of the joints in ladle lining by the reduction of the penetration of liquid slag and molten steel.Alumina-magnesiacarbon refractories are overall reviewed,in terms of major raw materials,thermal evolution,corrosion and oxidation,and thermomechanical behavior,as well as type,addition and fraction of magnesia used.General commercial products contain 5%-10%MgO and 5%-10%C with a certain amount of metallic aluminum powder,which is believed to facilitate spinel formation at early stage of heating-up,although high magnesia containing AMC bricks are studied and used sometimes.With low ratio of Al2O3/C=12.9 and the carbon content of 6.4%C,AMC brick exhibits the highest corrosion resistance.It is important to determine the type,addition and fraction of magnesia used in AMC refractories for demonstrating high corrosion resistance and superior thermomechanical behavior. 相似文献
17.
18.
S. I. Shcheglov V. A. Karasik V. A. Sazhin 《Refractories and Industrial Ceramics》1967,8(5-6):272-276
Conclusions A technology was developed for making ladle brick from Ch1PK semiacid clays mined in the Chasov Yar area.The biggest difference between semiacid ladle brick and firebrick is the after-expansion at service temperatures of 1500–1600° C which reaches about 3% and which densifies the structure of the ladle.The life of semiacid brick in 250-ton steel ladles on average is 11% higher than ordinary ladle brick.The production of ladle brick from semiacid raw materials is economic. The lower cost of the product is a result of using cheaper raw materials and firing the clay into chamotte and products at lower temperatures.Translated from Ogneupory, No. 5, pp. 3–7, May 1967. 相似文献
19.
Z. Aslano?lu 《Ceramics International》2011,37(8):3419-3423
In steel production, ladles must be preheated to minimize the heat loss of the steel melt, prevent thermal shock of refractory bricks (MgO-C), and to maximize the lining life of ladle. Partial oxidation of MgO-C bricks begins in the graphite bond during the preheating. Oxidation of graphite bond also causes a decrease in performance of the bricks because of an increase in the brick porosity. In this article, coating on a MgO-C brick surface by a ceramic film to protect against carbon oxidation was studied. Coated and un-coated bricks were heated at 1200 °C, cooled to room temperature, then the brick properties investigated. The oxidization resistance properties of brick with coating were much better than those without coating, which should lead to longer refractory service life. 相似文献