检索结果-南通市图书馆

Temperature-insensitive microwave absorption of TiB2-Al_(2)O_(3)/MgAl_(2)O_(4) ceramics based on controllable electrical conductivity

引用

Science China(Technological Sciences) 2021年第6期64卷 1250-1263页

作者： LIU XiongZhang ZHANG Sealing LUO Hui CHEN Fu LI DongMeng WANG Xian GONG RongZhou School of Optical and Electronic Information Huazhong University of Science and TechnologyWuhan 430074China College of Mechanical and Electronic Engineering Northwest Agriculture and Forestry UniversityYangling 712100China School of Information Science and Engineering Wuhan University of Science and TechnologyWuhan 430081China

The design of the high-temperature microwave absorbing materials (MAMs) with temperature-insensitive and considerable microwave absorption (MA) capacity is a tremendous *** B2-Al_(2)O_(3)/Mg Al_(2)O_(4) MAMs are prepared by the spark plasma sintering (SPS).Further,the influences of the Al_(2)O_(3) content on the flexural strength,thermal stability,high-temperature electrical conductivity,dielectric and MA properties are *** results show that the Al_(2)O_(3) content is associated with flexural strength,high-temperature thermal stability,electrical conductivity,dielectric and MA ***,the temperatureinsensitive and considerable MA properties with the minimum reflection loss (RLmin) ranging from -19.4 to -14.3 dB and the effective absorption bandwidth (EAB,RL<-5 dB) of 3.19–3.55 GHz are attained at 25°C–700°C in 8.2–12.4 GHz as the Al_(2)O_(3) content increases from 70.6 wt%to 80.6 wt%.This is ascribed to the compensating effect of the positive and negative temperature coefficient materials on the high-temperature electrical conductivity as well as the co-play of the dipolar and interfacial polarization at elevated ***,Ti B2-Al_(2)O_(3)/Mg Al_(2)O_(4) ceramics exhibit the ideal prospect as the high-temperature MAMs.

关键词： titanium boride aluminium oxide magnesium-aluminate spinel high-temperature electrical conductivity temperatureinsensitive microwave absorption properties

来源：

维普期刊数据库

同方期刊数据库评论

在线全文

学校读者我要写书评

暂无评论

CHARACTERIZATION AND CATALYTIC PERFORMANCE OF PLATINUM SUPPORTED ON Sn-MgAl2O4

引用

Journal of Energy Chemistry 1997年第4期 292-299页

作者： DONG Wen-Sheng WANG Xin-Kui PENG Shao-Yi(Institute of Coal Chemistry The Chinese Academy of SciencesTaiyuan, Shanxi 030001)

Sn-MgAl2O4supports were Prepared by coprecipitation methodwith different Sn contents. Pt(0.35%（mass）) was incorporated with theseobtained supports by inciPient weiness impregnation. The obtained catalystswere characterized by TPR（temperature programmed reduction）, H2-TPD（temperature programmed desorption） and tested in propanedehydrogenation. The TPR results showed an assiSted reduction of tin byplatinum. However, the tin oxide was stabilized by interaction withMgAl2O4 support. TPD data indicated that tin inhibited inactivatedadsorption of hydrogen but promoted the activated adsorption. In addition,the activity of propane dehydrogenation over the Pt/Sn-MgAl2O4 catalystincreased with the increaSe of tin content. These results imply that tin canpromote platinUm dispersion by anchoring or interaction effect.

关键词： dehydrogenation platinum tin magnesium-aluminate spinel TPR H2-TPD

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Influence of Ferrovanadium Slag on Bauxite Based Self-flow Castables

引用

China's Refractories 2017年第3期26卷 28-31页

作者： ZHANG Junbo DONG Yifan Tang Xunhai XU Ziwei ZHANG Wenwen Central Research Institute of Building and Construction Co. Ltd.MCC Group Beijing Beizhong Steam Turbine Generator Co. Ltd. China Jingye Engineering Co. Ltd.

Bauxite based self-flow castables were prepared by using bauxite,ferrovanadium slag,microsilica,high efficient admixture as main starting materials,and calcium aluminate cement as binder. The cold modulus of rupture,cold crushing strength and permanent linear change were determined. The phase constituents of the specimens were analyzed by X-ray diffraction( XRD),and the microstructure was observed with scanning electron microscopy( SEM). The experimental results show that with increasing the addition of ferrovanadium slag,the strength of specimens dried at 110 ℃ decreases,while the strength of specimens fired at 1 350 ℃ first increases and then decreases,the bulk density of specimens slightly decreases,the crystalline phase content of the formed magnesium-aluminate spinel increases in the structure and the permanent linear change( PLC) of specimens transforms from contraction to expansion. The appropriate addition of ferrovanadium slag is beneficial to improve the sintering strength and volume stability of bauxite based castables and the optimal addition of ferrovanadium slag is 40 mass%.

关键词： ferrovanadium slag self-flow castables magnesium-aluminate spinel

来源：

同方期刊数据库评论

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

欢迎您,

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案：

请选择收藏分类：

通借通还

欢迎您,

建议与咨询 留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

时间限定

文献类型

馆藏选择

核心期刊

语言

文献类型

帮助

文字说明：

检索规则说明：

检索范例：

分类表

所选分类

限定检索结果

文献类型

馆藏范围

日期分布

学科分类号

主题

机构

作者

语言

在线全文

在线全文

在线全文

请选择保存的检索档案： 新增检索档案 确定 取消

请选择收藏分类： 新增自定义分类 确定 取消

通借通还

建议与咨询留下您的常用邮箱和电话号码，以便我们向您反馈解决方案和替代方法

请选择保存的检索档案：

请选择收藏分类：