熔融石英对Al2O3-SiC-C浇注料性能的影响

探讨了熔融石英加入量对Al2O3-SiC-C质浇注料性能的影响.少量的熔融石英加入量对材料性能没有不利影响,并且可以改善材料的抗氧化性能.衍射分析证明,无论是还原还是氧化气氛下处理,随着石英量增加,莫来石生成量增加,但是过量的莫来石生成可能引起较大膨胀,产生局部开裂.     

用莫来石质自流浇注料修复高炉钢砖

重钢4号高炉由于炉喉钢砖严重变形,对高炉生产带来很不利的影响.为此采用莫来石自流浇注料快速修复钢砖,取得了很好的效果.     

Effects of cement content on the microstructural evolution and mechanical properties of cement-bonded corundum castables

The cement-bonded corundum castables are often subjected to great temperature gradient in the service process of purging plugs for refining ladle. The mechanical properties of such castables are of particular interest in the serviceability and the safety of purging plug, which are significantly influenced by the microstructures including the amount, size and morphology of materials. The reported cement contents in compounds of purging plugs are generally low or ultralow, which inevitably limits the adjustable range of the mechanical properties enhancement by regulating their microstructures. In the present research, a serial of comprehensive experiments have been carried out, including the high cement contents (10–15 wt%), so as to further understand the role of cement content on the microstructural evolution and mechanical properties of castables. It is found that the phase compositions and microstructure can be optimized through adjusting the cement content in corundum castables. When the cement content is below 10 wt%, the hexagonal flake CA₆ grains are platelet-shaped both in the matrix and at the border of the aggregates, their amount and size increase and distributions are more uniformly with cement content. When the cement content is above 10 wt%, small amount of granular crystals CA₂ are detected in matrix, and CA₆ crystals transform to equiaxial morphologies after cement content of 10 wt%. This research also provides quantitative relationship between the mechanical properties of the castables and the cement content. Castables with cement content of 10 wt% contain most hexagonal flake CA₆ crystals, so that they have the highest CMOR and HMOR after heating at 1600 °C. However, CMOR decreases after cement content of 10 wt% due to the porosity and volumetric expansion from the formation of in-situ CA₆ and CA₂.     

低水泥自流耐火浇注料

简述了加有ＳｉＯ２、Ａｌ２Ｏ３微粉的高铝质低水泥自流浇注料中所涉及的化学过程。研究了ＳｉＯ２、Ａｌ２Ｏ３微粉、高铝水泥含量、加水量对低水泥耐火浇注料物理性能的影响。讨论了分散剂、促凝剂、延迟硬化剂在低水泥自流耐火浇注料中的作用。     

高性能镁尖晶石质浇注料的研制

以不同粒度的电熔镁砂(≤8、≤0.088 mm)和铝镁尖晶石细粉(≤0.088 mm)为主要原料,经振动成型制备了一系列镁尖晶石质浇注料试样,探讨了镁质结合剂和活性氧化铝微粉加入量(w)分别为1%、2%、3%、4%和5%时对浇注料试样分别经110、1 000和1 600℃热处理后物理性能的影响,并将优选的合适配方试样与RH炉用烧成镁尖晶石砖进行了常规物理性能、抗热震性能和抗渣性能比较。结果表明:当镁质结合剂加入量(w)由1%增至2%时,试样经不同温度处理后的强度显著增加;但当其加入量超过2%(w)后,试样经不同温度处理后的强度尤其是在1 450℃的高温抗折强度逐渐向相反的方向变化;当活性氧化铝微粉加入量(w)由1%增至3%,试样经110℃热处理后的强度下降较快,但经1 000和1 600℃热处理后的强度和线膨胀率及高温抗折强度却呈现增加的趋势;当加入量超过3%(w)后,试样的高温抗折强度开始下降。研制的镁尖晶石质浇注料经1 600℃处理后具有较高的致密度及骨料和基质间存在微细裂纹的特征,与烧成镁尖晶石砖相比,具有较好的抗热震性能、抗渣性能和较低的高温强度。     

eρ-Al2O3和铝酸盐水泥对磷酸铝结合高铝浇注料性能的影响

以优质高铝矾土或板状刚玉、烧结α-Al2O3微粉为主要原料,采用磷酸铝和ρ-Al2O3为固化剂,研究铝酸盐水泥和ρ-Al2O3对磷酸盐结合高铝质浇注料性能的影响。结果表明,单独采用ρ-Al2O3为固化剂其硬化效果差,且随ρ-Al2O3加入量的增大,施工性能降低;单独采用铝酸盐水泥不利于浇注料的高温性能;而采用ρ-Al2O3和铝酸盐水泥复合固化硬化效果好,且浇注料综合性能比单独使用ρ-Al2O3或铝酸盐水泥均有显著提高。     

钢包用碱性耐火浇注料的性能研究

以镁砂为主要原料,通过改变基质中Al2O3细粉的加入量,在110℃、24h烘干,1500℃、3h烧成制度下,研究了Al2O3细粉的加入对碱性浇注料性能的影响。结果表明,当Al2O3细粉的加入量大于或小于5%时,碱性浇注料显气孔率大、耐压强度低、抗渣性能差。当Al2O3细粉加入量为5%时,碱性浇注料综合性能优良。     

添加Si、Al、Si_3N_4对Al_2O_3－SiC－C质浇注料性能的影响

通过对Ａｌ２Ｏ３－ＳｉＣ－Ｃ质浇注料的力学性能、抗氧化性和抗渣蚀性的研究，表明添加Ｓｉ、Ａｌ、Ｓｉ３Ｎ４可提高材料的抗氧化性和抗法侵蚀性，并对烧后力学性能有一定改善。     

RH TB浸渍管长寿技术研究与应用

结合鞍钢1700ASP中薄板坯连铸生产硅钢的实践，系统分析了RH TB浸渍管的损毁机理，并据此采取了相应的改进措施。通过优化烘烤制度、维护方式、生产组织模式和生产工艺，有效地提高了鞍钢1700ASP线RH TB浸渍管的使用寿命，为鞍钢1700ASP线硅钢的稳定生产提供了保证。