【摘 要】
：
采用激光熔注技术在Ti-6Al-4V表面制备了ZrO2p热障涂层,利用X-射线衍射、电子背散射衍射及扫描电镜技术,研究了激光熔注过程中ZrO2颗粒的组织演变规律。结果表明:通过原子固态扩散,团聚态ZrO2颗粒内的微粒尺寸增大,并由球状变为多面体状;激光熔注后,ZrO2颗粒中未发现单斜相(m-ZrO2);35%的稳定四方相(t'-ZrO2)转变为立方相(c-ZrO2
【机 构】
：
华中科技大学材料科学与工程学院,湖北武汉430074
论文部分内容阅读
采用激光熔注技术在Ti-6Al-4V表面制备了ZrO2p热障涂层,利用X-射线衍射、电子背散射衍射及扫描电镜技术,研究了激光熔注过程中ZrO2颗粒的组织演变规律。结果表明:通过原子固态扩散,团聚态ZrO2颗粒内的微粒尺寸增大,并由球状变为多面体状;激光熔注后,ZrO2颗粒中未发现单斜相(m-ZrO2);35%的稳定四方相(t'-ZrO2)转变为立方相(c-ZrO2);内应力降低,导致90%的正交相(o-ZrO2)转变为c-ZrO2。单个微粒内同时存在块状和纳米颗粒状t'-ZrO2和c-ZrO2,残留的o-ZrO2集中分布于微粒界面。ZrO2的组织演变使得微粒间的结合强度降低,促使ZrO2大颗粒离散成细小颗粒,提高了涂层的防热性能。
其他文献
To solve the issue of the contradiction between photovoltaic power generation and plant photosynthesis for sunlight demand, we propose a design method of multi-passband polymer multilayer optical structure. Using polycarbonate (PC) and polymethyl methacry
The original publication omitted the following authors from the list of authors on the title page:
In contrast to ion beams produced by conventional accelerators, ion beams accelerated by ultrashort intense laser pulses have advantages of ultrashort bunch duration and ultrahigh density, which are achieved in compact size. However, it is still challengi
从实验上和理论上对光折变晶体Bi12SiO20的电光效应和光电导效应进行了系统的研究,并进一步探讨了这两种效应中出现的非稳振荡现象.
利用研制的探测大气二氧化碳廓线的振动拉曼激光雷达系统采集的氮气分子振动拉曼散射信号,结合激光雷达探测时的大气消光数据,反演求出激光雷达的几何因子曲线。并对气溶胶波长指数变化对振动拉曼信号反演几何因子造成的影响进行分析与估算。气溶胶消光波长指数变化对振动拉曼散射信号反演几何因子会带来较大的误差影响。当气溶胶消光波长指数或其谱分布确定时,振动拉曼散射信号反演几何因子具有简便、可靠等优点,在振动拉曼激光雷达系统几何因子确定中可以充分应用此方法。
Multidimensional instabilities always develop with time during the process of radiation pressure acceleration, and are detrimental to the generation of monoenergetic proton beams. In this paper, a sharp-front laser is proposed to irradiate a triple-layer
In this work, we present a novel biochemical sensing approach based on a plasmonic sensor chip, combined with a specific receptor, excited and interrogated via a custom 3D-printed holder through a transmission-based experimental setup, exploiting polymer
We report a waveguide crossing based on a multimode-interference (MMI) structure for metal-insulator-metal (MIM) waveguides. The MMI-based crossing comprises two orthogonal intersecting MMI waveguides that are connected to the single-mode input/output wav
今年一月末，美国陆军电子学司令部将要求各航空公司投标研制以激光作数据显示与印刷的高强度光源的显示装置样机。激光显示早期的工作已由国际商业机械公司与德克萨斯仪器公司在陆军的举办下进行。