Low cement (LC) and ultra low cement (ULC) bauxite SiC castables are important and high performance monolithic refractories and they have been widely used in iron making and incinerator linings. In this work, rheol...Low cement (LC) and ultra low cement (ULC) bauxite SiC castables are important and high performance monolithic refractories and they have been widely used in iron making and incinerator linings. In this work, rheological behavior of LC and ULC bauxite based SiC containing castables has been studied, including the effects of SiC content and cement content on rheological properties of the castables. The results show that with an increase of SiC and cement content, rheological properties of the castables deteriorate. On the other hand, moderate amounts of SiC (4%～8%) and of calcium aluminate cement (2%～4%) have very slight influence on rheological properties, (i.e. when the castables are sheared their torque and yield torque only slightly increase with the shearing speed). The rheological characteristics of the castables follow Bingham fluid and always show shear thinning behavior.展开更多
Rheplpgy of castables is greatly affected and controlled by rheological behavior of their matrix. In this work ,the rheological properties of bauxite-based castable matrix have been studied. The effects of super-fine ...Rheplpgy of castables is greatly affected and controlled by rheological behavior of their matrix. In this work ,the rheological properties of bauxite-based castable matrix have been studied. The effects of super-fine silica and alumina addition , water/ cement ratio, dispersants and bauxite particle-size on viscosity, shear rate and shear stress of the slur-ries have been investigated . Based on these results, the range of optimum composition of the matrix with good rheological behavior has been obtained.展开更多
Oxidation of the added graphite and the bonding carbon is an imortant degradation mode of doloma-carbon refractories in service,In this work,the behavior and effects of various boron bearing materials(CaB6,ZrB2,Bc and...Oxidation of the added graphite and the bonding carbon is an imortant degradation mode of doloma-carbon refractories in service,In this work,the behavior and effects of various boron bearing materials(CaB6,ZrB2,Bc and colemanite)as an-tioxidants have been investigated and compared to the effect of Al-Mg alloy,For CaO-MgO-C mate-rials,the effect of boron bearingadditives is better than Al-Mg alloy,The borate melt formed at high temperature would retard or prevent carbon oxidation,thus contributing to improved oxidation resistance,Preliminary investigations on the effect of boron bearing additives and Al-Mg alloy on corrosion resistance of doloma-carbon materials have indicated that simultaneous addition of the two types of additives would lead to pronounced improvement of slag corrosion resistance.展开更多
In this work, the rheological behavior of ultra-low cement alumina-based castables with addition of flake graphite and extruded graphite pellets has been investigated by using IBB rheometer. Emphasis has been laid on ...In this work, the rheological behavior of ultra-low cement alumina-based castables with addition of flake graphite and extruded graphite pellets has been investigated by using IBB rheometer. Emphasis has been laid on the influence of the type and amount of carbon addition on rheological properties of the alumina-based castables and the results are compared with corresponding alumina castable samples without any carbon addition. It is found that alumina-based castables with extruded graphite pellets have good rheological behavior and flowability with lower water demand (<6.3%) and no segregation during the shearing of castable.展开更多
Zhengzhou University is one of the national key universities in China and is jointly supported by the Ministry of Education and Henan Provincial Government. It is located in Zhengzhou city, capital of Henan province i...Zhengzhou University is one of the national key universities in China and is jointly supported by the Ministry of Education and Henan Provincial Government. It is located in Zhengzhou city, capital of Henan province in central China which is the cradle of Chinese culture. The university campus covers an area of 4.3 million m2. There are 40 thousand undergraduate and 3600 post-graduate students. Its ceramics department enrolls about 350 students.展开更多
文摘Low cement (LC) and ultra low cement (ULC) bauxite SiC castables are important and high performance monolithic refractories and they have been widely used in iron making and incinerator linings. In this work, rheological behavior of LC and ULC bauxite based SiC containing castables has been studied, including the effects of SiC content and cement content on rheological properties of the castables. The results show that with an increase of SiC and cement content, rheological properties of the castables deteriorate. On the other hand, moderate amounts of SiC (4%～8%) and of calcium aluminate cement (2%～4%) have very slight influence on rheological properties, (i.e. when the castables are sheared their torque and yield torque only slightly increase with the shearing speed). The rheological characteristics of the castables follow Bingham fluid and always show shear thinning behavior.
文摘Rheplpgy of castables is greatly affected and controlled by rheological behavior of their matrix. In this work ,the rheological properties of bauxite-based castable matrix have been studied. The effects of super-fine silica and alumina addition , water/ cement ratio, dispersants and bauxite particle-size on viscosity, shear rate and shear stress of the slur-ries have been investigated . Based on these results, the range of optimum composition of the matrix with good rheological behavior has been obtained.
文摘Oxidation of the added graphite and the bonding carbon is an imortant degradation mode of doloma-carbon refractories in service,In this work,the behavior and effects of various boron bearing materials(CaB6,ZrB2,Bc and colemanite)as an-tioxidants have been investigated and compared to the effect of Al-Mg alloy,For CaO-MgO-C mate-rials,the effect of boron bearingadditives is better than Al-Mg alloy,The borate melt formed at high temperature would retard or prevent carbon oxidation,thus contributing to improved oxidation resistance,Preliminary investigations on the effect of boron bearing additives and Al-Mg alloy on corrosion resistance of doloma-carbon materials have indicated that simultaneous addition of the two types of additives would lead to pronounced improvement of slag corrosion resistance.
文摘In this work, the rheological behavior of ultra-low cement alumina-based castables with addition of flake graphite and extruded graphite pellets has been investigated by using IBB rheometer. Emphasis has been laid on the influence of the type and amount of carbon addition on rheological properties of the alumina-based castables and the results are compared with corresponding alumina castable samples without any carbon addition. It is found that alumina-based castables with extruded graphite pellets have good rheological behavior and flowability with lower water demand (<6.3%) and no segregation during the shearing of castable.
文摘Zhengzhou University is one of the national key universities in China and is jointly supported by the Ministry of Education and Henan Provincial Government. It is located in Zhengzhou city, capital of Henan province in central China which is the cradle of Chinese culture. The university campus covers an area of 4.3 million m2. There are 40 thousand undergraduate and 3600 post-graduate students. Its ceramics department enrolls about 350 students.
