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Effects of Tabular Corundum Types on properties of Corundum-spinel Castables

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China.s.refractories 2017年第4期26卷 50-52页

作者： ZHAO Hongbo HUANG Jin YU Tongshu CHEN Lu ZHANG Hui LU Xiangyang state Key Laboratory of Advanced refractories Sinosteel Luoyang Institute of Refractories Reasearch Co.Ltd.Luoyang 471039China

The corundum - spinel castables were prepared by six kinds of tabular corundum, as aggregates, respective- ly, and their linear change rate on heating, apparent porosity, bulk density, cold modulus of rupture, coht crushing strength, hot modulus of rupture and thermal shock resistance were compared and studied. The results show that： 1） the six tabular corundum materia.s.have similar main chemical composition but their physical properties vary for the different technical procedures which result in different properties of castables ; 2 ） the optimal properties of corundum - spinel castables corre- spotut to different tabular corundum types, so the corundum type shall be selected according to the application of the castables.

关键词： tabular corundum corundum - spinel castables properties

Comparison with Molecular surface Electrostatic potential and Thermal Reactivity of Nitramines

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含能材料 2015年第12期23卷 1155-1161页

作者： svatopluk Zeman Zdenek Friedl Monika Bartoskova Qi-Long YAN Institute of Energetic Materials Faculty of Chemical TechnologyUniversityo f PardubiceCZ-53210PardubicetheCzechRepublic Facultyof Chemistry Brno Universityof TechnologyCZ.-61200Brnothe Czech Republic

Molecular surface electrostatic potentia.s.V_s(r) ( Esp) of seventeen nitramines have been calculated. As a criterion of the imbalance between the maximum positive,V_(s,max) and minimum negative,V_(s,min),values of molecular surface electrostatic potentia.s.their sum was derived and used as a new simple characteristic for Esps-V_(s,Σ). These V_(s,Σ) values have close relationships with the Arrhenius parameters,activation energy E_a and preexponent log A,of thermal decomposition of the nitramines studied. The correlation between the V_(s,Σ) values and hea.s.of fusion of the nitramines studied is described. These findings suggested analyzing the physico-chemical behavior of the nitramine crysta.s.during this decomposition; in this connection an investigation was carried out using isothermal thermogravimetry and scanning electron microscopy of thermally exposed crysta.s.of cis-1,3,4,6-tetranitrooctahydroimidazo-[4,5-d]imidazole( sintering of its crystal surfaces),of β-1,3,5,7-tetranitro-1,3,5,7-tetrazocane( cracking of its crysta.s.during β !δ tra.s.tion) and of 2,4,6,8,10,12-hexanitro-2,4,6,8,10,12-hexaaza.s.wurtzitane. The results suggest a need to study the pre-decomposition states on thermal decomposition of the nitramines' molecule's crysta.s.

关键词：爆破器料含能材料材料烟火材料

preparation and properties of Calcium Hexaaluminate porous Ceramics

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China.s.refractories 2020年第1期29卷 15-19页

作者： WANG Gang ZHANG Qi HAN Jia.s.en YUAN Bo LI Hongxia state Key Laboratory of Advanced refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang 471039China

In this paper,calcium hexaaluminate(CA6)porous ceramics were prepared by a foaming method combined with cement solidification *** effects of the foaming agent addition on the microstructure and the properties of the ceramics were *** results show that the microstructure and the porosity of the ceramics can be controlled by adjusting the addition of the foaming *** the addition of the foaming agent increased,the bulk density reduced from 1 g·cm^-3 to 0.35 g·cm^-3,the porosity increased from 70.4%to 89.6%,the compressive strength reduced from 18.46 Mpa to 1.66 Mpa,and the thermal conductivity at 1000°C decreased from 0.382 W·m^-1·K^-1 to 0.144 W·m^-1·K^-*** is indicated that calcium hexaaluminate porous ceramics with low density,high strength and low thermal conductivity can be obtained by the foaming *** the lining material of high temperature electric furnaces,the ceramic has excellent energy saving effect.

关键词： calcium hexaaluminate porous ceramics foaming method

Internal stress of dense Refractory Castables during Unilateral Heating

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China.s.refractories 2018年第1期27卷 30-34页

作者： zhang xin liu yan wang zhanmin cao xiying zhao jin lu zhiqiang state Key Laboratory of Advanced refractories Sinosteel Luoyang Institute of Refractories Research Co. Ltd. Luoyang 471039 China

The change of the internal stress of dense refractory castables during unilateral rapid heating was studied by the electric stress measurement. The results indicate that：（1） during rapid heating, the position near the heated surface is under compressive stress ; the closer the position to the heated surface, the larger the compressive stress; （2） the specimen bursts during the rapid heating; （3） the calculated stress of the structure at the burst moment shows that the compressive stress produced at the same depth as the cracking surface exceeds the ultimate strength of the structure.

关键词： dense refractory castables stress electric stress measurement burst

RUL of Un-burnt High purity silica Bricks Used in Gla.s.Industry

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China.s.refractories 2014年第4期23卷 53-56页

作者： HAN Bo LI Yushan ANH(Tianjin) refractories Co. Ltd.

High purity silica bricks have stable physical properties,except for the RUL （0.2 Mpa） exhibiting extreme two different levels of high-level RUL T0.6 of 1 683-1 686 ℃ and low-level RUL T0.6 of1 174-1 184 ℃.The low RUL phenomenon was researched,the formation reasons and solutions were analyzed in this *** low-level RUL T0.6 of 1 174-1 184 ℃ of the un-burnt high purity silica bricks is a pseudo RUL T0.6 phenomenon for the tra.s.ormation of crystalline *** real RUL T0.6 of the specimen hot treated at 1 093 ℃ is ＞ 1 680 ℃.Therefore,the un-burnt high purity silica bricks shall be hot treated at about 1 100 ℃ firstly before testing *** the heating up of the lining of gla.s.tank arch,baking curves with long holding time at 1 100 ℃ shall be strictly obeyed to avoid the obvious shrinkage negatively influencing the lining stability.

关键词： silica brick refractoriness under load polymorph tra.s.ormation

Mechanisms behind elevated serum levels of plasminogen activator inhibitor-1 in frontotemporal lobar degeneration

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Neural Regeneration Research 2025年第8期20卷 2317-2318页

作者： Francesco Angelucci Jakub Hort Memory Clinic Department of NeurologySecond Faculty of MedicineCharles University and Motol University HospitalPragueCzech Republic International Clinical Research Centre St.Anne’s University HospitalBrnoCzech Republic

Frontotemporal lobar degeneration(FTLd)is a form of progressive dementia characterized by degeneration of the frontal and temporal lobes of the *** pathology involves a.s.ries of cognitive,behavioral,and neurological ... 详细信息

关键词： degeneration elevated pathology

Influence of pre-synthesized Al_(2)O_(3)-siC composite powder from clay on properties of low-carbon MgO-C refractories

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Journal of Iron and steel Research International 2022年第7期29卷 1080-1088页

作者： Bei-yue Ma Xin-ming Ren Zhi Gao Fan Qian Zhao-yang Liu Guo-qi Liu Jing-kun Yu Gao-feng Fu Key Laboratory for Ecological Metallurgy of Multimetallic Mineral(Ministry of Education) Shenyang 110819LiaoningChina school of Metallurgy Northeastern UniversityShenyang 110819LiaoningChina state Key Laboratory of Advance refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang 471039HenanChina

To improve the properties of low-carbonization of MgO–C refractories,the introduction of composite additives is an effective ***_(2)O_(3)–siC composite powder was prepared from clay using electromagnetic induction heating and carbon embedded ***,the Al_(2)O_(3)–siC composite powder synthesized by electromagnetic induction heating at 600 A was added into low-carbon MgO–C refractories(4 wt.%)to improve their *** results showed that when the addition amount of Al_(2)O_(3)–siC composite powder is within the range of 2.5–5.0 wt.%,the properties of low-carbon MgO–C samples were significantly improved,e.g.,the apparent porosity of 7.58%–8.04%,the bulk density of 2.98–2.99 g cm-3,the cold compressive strength of 55.72–57.93 Mpa,the residual strength after three air quenching at 1100°C of 74.86%–78.04%,and the decarburized layer depth after oxidized at 1400°C for 2 h of 14.03–14.87 ***,the idea for the rapid synthesis of Al_(2)O_(3)–siC composite powder provides an alternative low-carbon MgO–C refractories performance optimization strategy.

关键词： MgO–C refractory Electromagnetic induction heating Al_(2)O_(3)–siC composite powder Oxidation

production and Running status of China.s.refractories and Main downstream Industries in 2021

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China.s.refractories 2022年第3期31卷 1-4页

作者： LI Yongquan The a.s.ciation of China refractories Industry Beijing 100711China

1 production and Running status of China.s.refractories Industry in 20211.1 production and Running status In 2021,the overall output of China.s.refractory products remained *** to the statistical data from The a.s.ciation of China refractories Industry,China.s.refractories output was 24.0267 million tons,decreasing by 3.04%YOY,in which the outputs of dense shaped refractory products,insulating refractory products,and monolithic refractories were 13.2051 million tons decreasing by 3.68%YOY,609.8 thousand tons decreasing by 1.98%YOY,and 10.2118 million tons decreasing by 2.26%YOY,*** outputs of the main varieties are shown in Fig.1.

关键词： Running shaped refractories

strengthening Mullite Ceramic Materia.s.by Gas Infiltration

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China.s.refractories 2023年第2期32卷 37-40页

作者： ZHANG Qi WANG Gang WANG Qu YUAN Bo LI Hongxia state Key Laboratory of Advanced refractories Sinosteel Luoyang Institute of Refractories Research Co.Ltd.Luoyang471039China

In order to improve the high-temperature performance of mullite ceramic materia.s.mullite ceramic bodies were placed in closed containers with AlF_(3)·3H_(2)O powder and kept at 1 600 ℃ for 6 ***_(3)·3H_(2)O reacts with O_(2) to produce gaseous compounds AlOF and F,which penetrate into the bodies,promote Al2O3 and siO_(2) to form mullite whiskers,and strengthen the mullite ceramic *** results show that the mullite ceramics have enhanced hot strength,increased bulk density and declined apparent porosity by adding a certain amount of AlF_(3)·3H_(2)O in a closed *** the addition of AlF_(3)·3H_(2)O is 6%,the bulk density of the ceramic material reaches the maximum and the apparent porosity is the lowest;and when the addition of AlF_(3)·3H_(2)O is 8%,the hot strength of the material is the highest.

关键词： mullite whiskers ceramic materials gas infiltration high temperature performance