狭缝式铝—碳质浸入式水口

本文介绍了防止连铸中浸入式水口堵塞的方法，在浸入式水口材料中少加或不加ＳｉＯ２，能提高钢的质量。     

锆钙碳质浸入式水口上的Al2O3结瘤

1 前言 ZCG(ZrO_2-CaO-C)质浸入式水口,作为防止连铸时因Al_2O_3附着而引起水口内孔狭窄、堵塞的技术之一已实用化。其防止机理可理解为:水口内壁附着的Al_2O_3粒子与水口中ZrO_2-CaO骨料分解生成的CaO反应,生成低熔点化合物,继而被钢水除去。但是,目前实际上还存在着必须与吹Ar沸腾并用,以及防止附着效果不明显等不清楚之处。尤其是防止附着机理虽然有许多研究例子,但关于ZCG质     

吹气式浸入式水口的透气性

1 前言 连铸工艺中使用的吹气式浸入式水口,其Al_2O_3附着及夹杂物成了阻碍全连铸和造成钢坯质量缺陷的原因。为了防止Al_2O_3附着及促使夹杂物上浮,浸入式水口具有通过其内壁吹人惰性气体的功能,由于这种类型水口的透气性对钢质量的影响很大,所以对这种特性进行控制是极其重要的。 以前关于透气性已有很多报道,但这次研究的是透气质碳材料对该种浸入式水口狭缝内孔材质透气性的效果,其内容报道如下。     

提高连铸用含石墨浸入式水口的寿命

本文叙述了连铸时在渣线上含石墨浸入式水口受到侵蚀的主要原因，以及不同组成的试验制品在生产条件下的试验结果，按寿命排列的材料的顺序如下：Ａｌ２Ｏ３－Ｃ－ＳｉＣ－ＢＮ→ＺｒＯ２－Ｃ－ＳｉＣ→Ａｌ２Ｏ３－Ｃ－ＳｉＣ。     

浸入式水口防堵塞材料的开发与应用

将无碳材料应用于浸入式水口中，研究了其防止氧化铝堵塞的机理。由于氧化铝粘附量减少，故钢水能顺利流动，且钢水质量也得以提高。     

钢铁工业用定型含碳镁质和白云石耐火材料

镁质和白云石-碳试块系由不同等级的死烧中国镁砂和埃及白云石加工而成的。作为碳源采用10％～20％片状石墨以及适宜数量的沥青，采用甲阶酚醛树腊作为含碳结合剂及金属Al作为抗氧化剂。加工出的试块其抗氧化性、致密参数和常温耐压强度与还原气氛下在1500℃烧成后的固相组成和显微结构有关。在200％热处理镁碳和白云石-碳试块后常温耐压强度达到最大值，在还原气氛中于1000％烧成届稍微降低。这和沥青，树脂成分聚合成细的空心的纤维有关，持续达到1500℃。增加片状石墨的含量，从10％到15％和20％，在还原气氛中于1500℃烧成后体积密度随显气孔率的增加而显著降低。     

钢铁工业用定型含碳镁质和白云石质耐火材料

由分级的中国死烧镁砂和埃及白云石制取镁碳和白云石碳团块。10%～20%片状石墨作为碳源,以及适量的沥青、酚醛树脂作为碳质结合剂,金属Al作为抗氧化剂,用来加工这些团块。团块的抗氧化性、致密性参数和常温耐压强度被用来评价在还原气氛中于1500℃烧成之后,与固相组成和显微结构的关系。指出镁碳和白云石碳团块在200℃热处理并在还原性气氛中于1000℃下轻微还原后,常温耐压强度最大。这与沥青的聚合作用/树脂成分进入细的空纤维有关,可持续达1500℃。增加片状石墨含量,从10%到15%～20%,可以看到在还原气氛中于1500℃下烧成之后,随显气孔率增加,体积密度降低。     

Review of Basic Refractories and Development History of Sinosteel Luonai Basic Refractories

The importance of basic refractories during the development of steel,non-ferrous and cement industries was introduced.The process of magnesia-chrome bricks was ...     

连铸用浸入式水口砖--现状与发展远景

探讨了连铸用石英质及刚玉石墨质侵入式水口砖的生产工艺、性能及应用的现状。刚玉石墨质水口砖具有较低的抗热震性、较高的空气渗透性及在环保方面存在着危险性。在浇铸不脱氧钢及其它牌号钢时，采用以已知的方法改进的刚玉石墨质水口砖时仍未能解决铸孔堵塞的问题。按照传统工艺制造的石英质水口砖则消除了上述缺点，但是在浇铸低合金刚时，由于钢的构均不相同的石英质浸入式水口砖的对比试验结果表明，以石英玻璃为原料生产用于浇铸普通钢及低合金钢的制品的新型工艺和方法是有发展前途的。为了浇铸普通品种的钢，研制了结构经过改进的石英质浸式入水口砖，用它在板坯连铸机浇铸时，其寿命达720t钢，而资源性寿命为1200t钢。为了浇低合金钢，推荐采用经过变性处理的石英质水口砖，其使用寿命为360t钢，而资源性寿命为540t钢。     

High-Temperature Firing of Basic Refractories

An investigation was conducted to determine the hot modulus of rupture strength, the tendency to burst under iron oxide attack, the tendency to creep, and the hot-load-bearing strength of chromite-bearing basic refractories fired from 1400° to 2000°C. Petrographic examination was employed to define the mechanisms of improved bonding which resulted from firing at high temperatures. The results of these physical and chemical tests and the observed microstructure indicated that a greatly improved, highly stabilized basic refractory could be obtained by proper brick design and firing to temperatures of approximately 1700°C. Control of design features such as total silica content, chromite/periclase ratio, and chromite sizing was found to be necessary to achieve superior properties through high-temperature firing.     

Progress of Environment-friendly Basic Refractories for Cement Industry

The chrome pollution from cement industry was introduced briefly,the research on chrome free basic refractories for cement kilns was reviewed,the production technologies of magnesia calcia,magnesium aluminate spinel,magnesia hercynite refractories,etc. were specified,the principles to improve thermal shock resistance and coating adhesiveness of refractories were analyzed,the measures to extend service life by improving production equipment and service conditions of refractories were put forward,the future of chrome free refractories was expected and some developing suggestions were given.     

Oxidation Kinetics of Graphite Phase in Magnesia-Carbon Refractories

Decarbonization of resin-bonded magnesia-graphite refractories, as one of the most important parameters for brick lining performance in service, has been studied kinetically in the temperature range from 1000° to 1400°C in air, where carbon burnout by oxygen is the dominant decarbonizing mechanism. The rate of carbon burnout was followed by gas analysis, measuring the amount of CO converted into CO₂ as a function of reaction time. The experimental results have been rationalized using a mathematical model proposed for the oxidation kinetics, wherein the rate of inward diffusion of oxygen from the exterior atmosphere is predominant.     

玻璃熔窑蓄热室系列配套优质碱性耐火材料研制及其应用

玻璃熔窑蓄热室系列配套优质碱性耐火材料研制及其应用黄渊麟，丘必云，林剑成（轻工业部玻璃搪瓷工业科学研究所２０００５２）ＤｅｖｅｌｏｐｍｅｎｔａｎｄＡｐｐｌｉｃａｔｉｏｎｏｆａＳｅｒｉｅｓｏｆＨｉｇｈ－ＤｕｔｙＢａｓｉｃＲｅｆｒａｃｔｏｒｉｅｓｆｏｒＲ...     

An Innovative Submerged Entry Nozzle Design for Billet and Bloom Casting

Fluid flow in the mold has a significant impact on the quality of continuously cast steel products.Since it is strongly influenced by the SEN design,attention h...