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高性能六铝酸钙耐材原料

高性能六铝酸钙耐材原料

Microstructure and physical properties of steel-ladle purging plug refractory materials

新形势下全国耐火原料发展战略研讨会

作者：龙斌周云鹏田忠凯 andus buhr 张兰银安迈铝业(青岛)有限公司

合成耐材原料六铝酸钙（CA6）比较成熟的商业化的产品有致密型的博耐特（Bonite）和轻质骨料SLA92。两种原料化学纯度高,耐火度高,热震稳定性好。其中博耐特（Bonite）相对于同等体密的耐材原料热导率低,保温效果好,抗冲刷性强,广泛应... 详细信息

合成耐材原料六铝酸钙（CA6）比较成熟的商业化的产品有致密型的博耐特（Bonite）和轻质骨料SLA92。两种原料化学纯度高,耐火度高,热震稳定性好。其中博耐特（Bonite）相对于同等体密的耐材原料热导率低,保温效果好,抗冲刷性强,广泛应用于炼铝及钢铁工业。轻质骨料SLA92热导率低,性能稳定,在保温材料中得到广泛的应用。

关键词：博耐特 SLA92 炼铝钢铁保温材料

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International Journal of Minerals,Metallurgy and Materials 2017年第2期24卷 186-193页

作者： Bin Long Gui-ying Xu buhr Andreas School of Materials Science and Engineering University of Science and Technology Beijing Beijing 100083 China Almatis Qingdao Co. Ltd. Qingdao 266071 China Almatis GmbH Frankfurt 60528 Germany

Three different castables were prepared as steel-ladle purging-plug refractory materials： corundum-based low-cement castable （C-LCC）, corundum-spinel-based low-cement castable （C-S-LCC）, and no-cement corundum-spinel castable （C-S-NCC）（hydratable alu- mina p-A1203 bonded）. The properties of these castables were characterized with regard to water demand/flow ability, cold crushing strength （CCS）, cold modulus of rupture （CMoR）, permanent linear change （PLC）, apparent porosity, and hot modulus of rupture （HMoR）. The re- sults show the CCS/CMoR and HMoR of C-LCC and C-S-LCC are greater than those of the castable C-S-NCC. According to the micro- structure analysis, the sintering effect and the bonding type of the matrix material differ among the three castables. The calcium hexaluminate （CA6） phase in the matrix of C-LCC enhances the cold and hot mechanical strengths. In the case of C-S-LCC, the CA6 and 2CaO·2MgO·14A12O3（C2MEA14） ternary phases generated from the matrix can greatly increase the cold and hot mechanical strengths. In the case of the no-cement castable, sintering becomes difficult, resulting in a lower mechanical strength.

关键词： refractory materials purging plugs castable physical properties microstructure

Fracture behavior and microstructure analysis of Al2O3–MgO–CaO castables for steel-ladle purging plugs

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International Journal of Minerals,Metallurgy and Materials 2016年第11期23卷 1333-1339页

作者： Bin Long Gui-ying Xu Yong Li Andreas buhr School of Materials Science and Engineering University Science and Technology Beijing Beijing 100083 China Almatis Qingdao Co. Ltd. Qingdao 266071 China Almatis GmbH Frankfurt 60528 Germany

Three different castables based on the Al_2O_3–MgO –CaO system were prepared as steel-ladle purging plug refractories： corundum-based low-cement castable（C-LCC）, corundum-spinel-based low-cement castable（C-S-LCC）, and corundum-spinel no-cement castable（C-S-NCC）（hydratable alumina（ρ-Al_2O_3） bonded）. The fracture behavior at room temperature was tested by the method of ＂wedge-splitting＂ on samples pre-fired at different temperatures; the specific fracture energy G′f and notched tensile strength σNT were obtained from these tests. In addition, the Young＇s modulus E was measured by the method of resonance frequency of damping analysis（RFDA）. The thermal stress resistance parameter R′′′′ calculated using the values of G′f, σNT, and E was used to evaluate the thermal shock resistance of the materials. According to the microstructure analysis results, the sintering effect and the bonding type of the matrix material were different among these three castables, which explains their different fracture behaviors.

关键词： castables alumina magnesia copper oxide fracture behavior microstructure thermal shock resistance

Dimensional characterization of cadmium selenide nanocrystals via indirect Fourier transform evaluation of small-angle X-ray scattering data

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Nano Research 2019年第11期12卷 2849-2857页

作者： Julian Cedric Porsiel Bilal Temel Alfred Schirmacher Egbert buhr Georg Garnweitner Institute for Particle Technology(iPAT) Technische Universität BraunschweigBraunschweig38104Germany Physikalisch-Technische Bundesanstalt Braunschweig Braunschweig38116Germany Laboratory for Emerging Nanometrology Technische Universität BraunschweigBraunschweig38106Germany

The correlation of single-particle imaging and absorption spectroscopy made the development of sizing curves possible and enabled rapid size determination of semiconductor nanocrystals based solely on optical *** increasing demand and production of such materials has resulted in a question of comparability between existing models and adequate volume-weighted size-determining measurement ***-angle X-ray scattering(SAXS)is a well-established method for obtaining nanostructural information from particle systems while operating sample quantities up to a commercial scale with a large amount of statistically based *** work utilizes laboratory SAXS to characterize cadmium selenide nanocrystals with band edge energies between 1.97 and 3.08 *** evaluation of the scattering patterns is based on an indirect Fourier transformation(IFT),while dimensional parameters are derived from the model-free pair distance distribution functions(Dmode and Dg),as well as the modeled volume(Dv)and number(Dn)-weighted size-density *** find that comparable data from D̅n agree well with existing X-ray diffraction(XRD)and with transmission electron microscopy(TEM)results described in literature;this qualifies SAXS as an equivalent integral characterization *** based on an estimate,the radius of gyration yields equivalent accurate ***,corresponding volume-weighted data are shown that can be useful when transferring information to other *** parametrization represents the largest estimated size of the sample and implies that particles interact and deviate from the spherical morphology,whereas Dv demonstrates results not considering such effects.A full set of the parameters discussed quantifies the quality of a sample.

关键词： quantum dots small angle scattering indirect Fourier transform transmission electron microscopy optical absorption spectroscopy particle size distribution

Application of New Calcium Aluminate Cement CA-670 in Low Cement Castables

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China's Refractories 2017年第3期26卷 23-31页

作者： LONG Bin ZHOU Yunpeng ZHANG Lanyin REAS buhr Qingdao Almatis Co. Ltd. Almatis GmbH

A new calcium aluminate cement CA-670 was studied in the system of tabular alumina, white fused alumina （WFA）, and bauxite based low cement castables. The flow ability, strength development, and hot strength （ HMOR ） were investigated. Different types of additives were used for the CA-670 bonded castables. The results show CA-670 provides a good workability for each type of＂ castables. CA-670 displays a good compatibility with different types of additives. Testing on different batches of CA-670 shows good reproducible properties in each castable, which manifests good consistency and reliability of CA-670.

关键词： CA-670 low cement castable flow ability strength development HMOR

Spinel Castables for Steel Ladle Lining:In-Situ Versus Preformed

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China's Refractories 2012年第3期21卷 7-15页

作者： Andreas buhr Marion SCHNABEL LONG Bin Reinhard EXENBERGER Christian RAMPITSCH Jerry DUTTON Almatis GmbH Frankfurt Germany Qingdao Almatis Co. Ltd. Qingdao 266071 China Voestalpine Stahl GmbH Linz Austria Stourbridge United Kingdom

The paper discusses the difference in the formulation concepts of alumina - spinel （spinel containing ） and alumina - magnesia （ spin, el forming） castables and the influence on their physical properties. The individual property profile is discussed with respect to the requirements of refactory lining materials for the different zones of a steel ladle.

关键词： in-situ spinel preformed spinel steel ladle lining

Review of Matrix Aluminas for Refractory Formulations

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China's Refractories 2015年第1期24卷 57-62页

作者： Andreas buhr Rainer KOCKEGEY_LORENZ Lanyin ZHANG Bin LONG Yunpeng ZHOU Zhongkai TIAN Almatis GmbH Qingdao Almatis Co. Ltd.

Historically,ground calcined aluminas were the first high-alumina matrix products that were used in refractory formulations, in both shaped and unshaped products. At that time the flow properties of castables were enhanced by the use of silica fume. This was followed later by the development of fully ground reactive aluminas which contributed to the design of the matrix below 63 μm. In addition to aggregate fines,a range of bi-modal and multi-modal reactive aluminas were also developed. These not only gave improved physical properties but also better castable workability. This paper reviews matrix alumina developments over time,from basic ground calcines to complex multi-modal matrix products and their globally standardised manufacture.

关键词： matrix fillers reactive alumina porosity strength global product concept

博耐特(Bonite)——一种新型的合成致密CA_6耐火原料

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耐火材料 2006年第1期40卷 60-64页

作者：刘新彧 Andreas buhr Gunter Büchel R P Racher 安迈铝业(青岛)有限公司青岛266071 Almatis GmbH FrankfurtGermany Almatis Inc. LeetsdaleUSA

介绍了基于六铝酸钙(CA_6)矿物相的一种新型合成致密耐火骨料——博耐特(Bonite);讨论了博耐特原料以及由博耐特、板状刚玉或者二者复合制备的多种试验用浇注料的理化性能;并结合博耐特的相关应用领域进行了博耐特耐火材料抗铝液侵蚀、... 详细信息

介绍了基于六铝酸钙(CA_6)矿物相的一种新型合成致密耐火骨料——博耐特(Bonite);讨论了博耐特原料以及由博耐特、板状刚玉或者二者复合制备的多种试验用浇注料的理化性能;并结合博耐特的相关应用领域进行了博耐特耐火材料抗铝液侵蚀、热机械性能、热导率和微气孔等较为前瞻性的试验和探索。

关键词：博耐特致密骨料六铝酸钙板状刚王抗铝液侵蚀热导率微气孔

Effects of Specific Surface Area and Impurities of Reactive Alumina on Properties of Corundum Based Castables

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China's Refractories 2017年第4期26卷 37-43页

作者： ZHANG Ju ZHOU Yunpeng LONG Bin ZHANG Lanyin LIU Jinxue Andreas buhr JIA Quanli YE Guotian Zhengzhou University Zhengzhou 450001China Qingdao Almatis Co. Ltd.Qingdao 266510China Almatis GmbH Frankfurt 60528Germany

Effects of specific surface area and tiny amount of impurities of reactive alumina on the workability, sinte- ring and high temperature mechanical strength of corun- dum based castables were investigated. The results show that the presence of reactive alumina with high specific surface area leads to accelerating of the hydration of calcium aluminate cement, thus shortening the working time and setting time of the castables, which can be as- cribed that the critical energy barrier for stable nuclei of hydration products of cement can be reduced by the high specific surface area of reactive alumina. The sintering of the corundum based castables can be accelerated by the reactive alumina with high specific surface area and high amount of impurities, however, the reactive alumina with too high specific surface area and impurities can al- so lead to noticeable shrinkage of castables. In addition, high temperature mechanical strength of corundum based castables can be decreased by the higher amount of trace impurities of reactive alumina due to formation of low- melting phase at high temperatures.

关键词： reactive alumina specific surface area impurity corundum based eastables workability sintering