【摘 要】
：
The densification and the structure evolution of the plasma activated sintered (PAS sintered) ZrB2-ZrO2 composite via the ZrO2-coated ZrB2 powder (ZrB2@ZrO2) pr
【机 构】
：
State Key Laboratory of Advanced Technology for Materials Synthesis and Processing, Wuhan University
【出 处】
：
武汉理工大学学报（材料科学版）（英文版）
论文部分内容阅读
The densification and the structure evolution of the plasma activated sintered (PAS sintered) ZrB2-ZrO2 composite via the ZrO2-coated ZrB2 powder (ZrB2@ZrO2) prepared by in situ passivation method were investigated. The composition and microstructure were characterized by XRD, Raman, SEM, and EDS techniques. The coated powder has excellent sintering performance. The relative density of the composite reaches above 90％ at 1200 ℃, and the main sintering process occurs between ZrO2 particles. While at above 1500 ℃, the relative density reaches above 95％ and the main sintering process occurs between ZrB2 and ZrO2 particles. With the increase of ZrO2 coating content, the structure of the sintered body changes from ZrB2 conti-nuous network structure to island structure. When the content is 20％, an island structure is formed. Increasing the ZrO2 content further causes the overheating of ZrO2. Thus, the best sintering performance reaches when the coating content is 20wt％.
其他文献
装配式建筑固有的生产、运输、装配多空间调度特点,导致其与现行传统现浇建筑的调度节点存在诸多不兼容之处,制约了装配式建筑的快速发展。如何从多空间特点出发优化装配式建筑的项目调度,成为行业和学术界热切关注的焦点问题。本文运用文献研究、现场调研、问卷调查等方法辨识出14个关键影响因素,采用解释结构模型(ISM)揭示各因素之间的层级结构关系,借助交叉影响矩阵相乘法(MICMAC)从驱动力和依赖性角度对各影响因素进行机理分析。研究结果表明:信息技术应用与总承包管理水平是优化装配式建筑多空间项目调度的深层次影响因素,
The adhesion between warp sizing and fiber was systematically studied by using the roving method. Cotton roving and polyester roving were sized with various con
为研究外掺石灰石粉对水泥基材料抗碳硫硅钙石侵蚀性能的影响,本文采用电场加速侵蚀技术,对不同石灰石粉掺量水泥净浆试件进行低温硫酸盐侵蚀试验,并利用形貌变化、XRD及FTIR测试等手段分析其侵蚀过程。结果表明:外掺石灰石粉掺量越大,水泥基材料发生硫酸盐侵蚀的时间越早、侵蚀进程越快且侵蚀等级越高;外掺石灰石粉掺量不大于15%时,低温硫酸盐侵蚀条件下水泥基材料的侵蚀类型以钙矾石型与石膏型为主;当掺量不小于20%时,将同时发生钙矾石型、石膏型及碳硫硅钙石型硫酸盐侵蚀;为避免水泥基材料在低温硫酸盐侵蚀环境下发生TSA
为准确评价装配式建筑吊装施工安全风险等级并反映风险变化趋势,提出一种基于改进组合赋权-动态模糊理论的评价模型。综合考虑装配式建筑吊装施工特点,以人员、设备、构件、管理与环境等5个方面为视角识别并筛选出23个二级评价指标,并以此构建装配式建筑吊装施工安全风险评价指标体系;采用改进层次分析法耦合熵权法的改进组合赋权法计算各级评价指标权重;运用动态模糊理论计算各级评价指标的动态模糊值,从而直观反映出各级评价指标与总体的风险等级及其变化趋势。以黄石市某装配式建筑项目为实例对该方法进行验证。研究结果表明:该项目吊装
在数字孪生、智慧城市的浪潮下,建筑行业正积极探索一种能快速重塑"既有建筑"3D信息模型的方法。从深度学习3D目标检测算法角度出发,着手大规模建筑数据集的生成和点云深度学习理论,分析点云深度学习框架所需输入数据类型,重点介绍了各类建筑构件的3D边界框及三维点云的创建过程,对比具有相同数据结构的不同点云数据集并实现了基于ScanNet数据集的目标检测算法,进而整合出一套可行的基于深度学习的三维点云自动
We reported a rapid synthesis of Sm3+/Zr4+ co-doped Gd2Ti2O7 pyrochlore simulated nuclear wastes solidification by self-propagation plus quick pressing techniqu
Hollow nitrogen-doped porous carbon materials covered with different thicknesses of carbon layers were synthesized to assist evaluation of the influence of nitr
The ceramifiable polymer composite of MgO-Al2O3-SiO2/boron phenolic resin(MAS/BPF) with 40wt％ of inorganic fillers was calcined at 1200 ℃ for different time to
Nonequilibrium thermodynamics and transportation kinetics near the propagating solid-liquid interface dominates the rapid solidification process, which is far f
The crystallization behavior of Li2O-Al2O3-SiO2 glasses with various concentration of Li2O were investigated by DSC, XRD, and FE-SEM. The h/l-quartz s.s. is the