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Effect of Matrix Composition on Physical Properties of Al_3CON In-situ Reaction Reinforced Corundum Composite

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Journal of Wuhan University of Technology(Materials Science) 2008年第6期23卷 927-931页

作者：杨丁熬 College of Materials Science and Engineering Xi'an University of Architecture and Technology Kaifeng Special Refractories Co.Ltd. Sanmenxia Polytechnic

60% white corundum used for aggregate, 5% aluminium powder for fixed additions and 35% various additives for matrix were prepared for specimens 1#,2#,3#. They were mixed uniformly with the suitable resin as a binder and pressed under pressure of 315 ton forging press, then dried at 200℃ for 24 h. Effects of various additives on 1500 ℃×2 h creep properties of Al3CON reinforced corundum composite were researched. The experimenal results show that creep coefficients of specimens 1#,2#,3# at 1500 ℃×2 h are 1.4×10^- 4, -9.4×10^-4, -22.6×10^-4, respectively. Crushing strength of the slide plate added with suitable additive A after fired at 1500 ℃ ×3 h reaches to 225 MPa, the creep rate is positive all the time from 0% to 0.014% at 1500 ℃ for 2 h. The microstructure result analysis shows that reinforced phases of Al3CON fiber composite have been formed after fired with Al powder in coke at high temperatures for specimen 1#, and the strength of the composite is increased. The hot modulus of rupture is up to 59 MPa at 1400 ℃ and the RUL is obviously higher than that at 1700 ℃. Its service life is two times as that of Al2O3-C slide plate when used in the process of pouring steel. The mechanism of creep rate resistance of the composites can be discovered by means of SEM and EDAX analysis. It is concluded that the active Al3CON and Al2O3 multiphases that were formed by N2 in gas, C, Al and Al2O3 inside the matrix of the composites during in-situ reaction,which gives the composites outstanding creep rate resistance for the dense zone resuiting from Al3CON oxidation that inhibits contraction at the high temperature. Besides, the matrix will turn into the multiphase with high refractoriness, N content and its Al3CON reinforced fiber will further increase accordingly. In addition, Al3CON formed by Al2O3 and C, Al in the matrix with N2 in gas will inhibit the creep rate and also greatly improve the creep rate resistance of the composites.

关键词： matrix additives creep rate corundum Al3CON composite hmor

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

载体组成对Ni-Mo/硅铝沸石基FCC汽油加氢异构化与芳构化催化剂性能的影响

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石油学报（石油加工） 2005年第2期21卷 1-7页

作者：范煜鲍晓军石冈魏伟胜徐健石油大学中国石油天然气集团公司催化重点实验室北京102249

采用浸渍法分别制备了以氢型丝光沸石(hmor)、Hβ和HZSM5及其组合为载体的一元、二元及三元沸石基Ni Mo催化剂,考察了载体组成对FCC汽油加氢异构化与芳构化改质反应性能的影响。结果表明,一元、二元沸石基Ni Mo催化剂难以提供平衡的加... 详细信息

采用浸渍法分别制备了以氢型丝光沸石(hmor)、Hβ和HZSM5及其组合为载体的一元、二元及三元沸石基Ni Mo催化剂,考察了载体组成对FCC汽油加氢异构化与芳构化改质反应性能的影响。结果表明,一元、二元沸石基Ni Mo催化剂难以提供平衡的加氢异构化和芳构化活性,不能满足FCC汽油选择性加氢改质的要求;由适宜比例的三者组合得到的沸石基Ni Mo催化剂的加氢异构化、芳构化活性及稳定性得到显著提高,可在降低FCC汽油烯烃含量的同时保持产品的辛烷值,这归功于不同沸石之间的酸性与孔结构的协同作用。吡啶吸附红外酸性测试表明,催化剂的加氢异构化和芳构化活性与酸类型及不同酸之间的平衡密切相关,与B酸相比,L酸更有利于提高加氢异构化活性,L酸与B酸之适宜比例对于改善催化剂的芳构化活性及稳定性至关重要。

关键词： hmor Hβ HZSM-5 FCC汽油加氢异构化与芳构化辛烷值酸性

α-Al2O3与uf-SiO2对莫来石微球质隔热耐火材料性能的影响

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α-Al2O3与uf-SiO2对莫来石微球质隔热耐火材料性能的影响