【摘 要】
：
MCrAlY (M=Ni,Co,NiCo) alloys have been widely used as a bond layer for thermal barrier coatings (TBCs).However,oxides form discontinuously on MCrAlY surface in the marine environment since Cr2O3 can react with NaCl and H2O at temperatures above 500 ℃.Repl
【机 构】
：
Key Laboratory of Marine Materials and Related Technologies,Zhejiang Key Laboratory of Marine Materi
论文部分内容阅读
MCrAlY (M=Ni,Co,NiCo) alloys have been widely used as a bond layer for thermal barrier coatings (TBCs).However,oxides form discontinuously on MCrAlY surface in the marine environment since Cr2O3 can react with NaCl and H2O at temperatures above 500 ℃.Replacing Cr with other alloying elements (such as Si) might prevent severe salt-spray corrosion effectively.To save time and efforts in materials design of the Ni-Si-Al-Y system,we obtained the thermodynamic descriptions of the ternary compounds by coupling the CALPHAD (CALculation of PHAse Diagrams) approach and first-principles calculations.Seven and eighteen ternary compounds were evaluated and calculated in the Al-Si-Y and Ni-Si-Y systems,respectively.Phase diagrams of the two systems were depicted after a series of experimental Al/Ni-Si-RE(RE denotes rare earth elements,including La,Ce,Pr,Nd,Sm,Gd,Dy,Ho,and Er) systems being analyzed.It is found that the RE elements with the same reference states tend to form ternary compounds with the same crystal structures.The model-based descriptions are the basis for the research and development of novel NiSiAlY alloys in resisting high-temperature corrosion.
其他文献
SiO2/TiO2 composite films have been frequently used to realize the functions of self-cleaning and antire-flection.Increasing the TiO2 volume ratio in SiO2/TiO2 composite film is beneficial to enhance the self-cleaning effect,while high TiO2 content leads
Implementation of novel γ/γ\'Co-based superalloys with higher strength and improved creep durabil-ity is a challenging task for researchers.The lack of atomic-level understanding of plastic deformation behavior has seriously limited the exploration of t
Liquid phase sintering (LPS) is a proven technique for preparing large-size tungsten heavy alloys (WHAs).However,for densification,this processing requires that the matrix of WHAs keeps melting for a long time,which simultaneously causes W grain coarsenin
Efficient removal of pollutant formaldehyde (HCHO) at room temperature using transition-metal oxides remains a huge challenge to date.Manganese oxide can oxidize formaldehyde,however,how to control the valence states of manganese is the key to further imp
近年来,我国医疗器械行业发展迅速,特别是在2019年底新冠疫情暴发以来,医疗器械更是成为逆势获益的行业之一。但根据相关调查表明,我国医疗器械市场还是以低端医疗器械市场为主,高端医疗器械占比较低,其主要原因是国内高端医疗器械产业化水平不足。B公司CHA项目属于Ⅲ类高风险医疗器械,其产业化过程由于技术难度大,产品工艺复杂使得产业化面临诸多风险,项目管理难度较大。本文将B公司CHA产业化项目作为研究对象
物流网络是区域物流发展的重要载体,在构建现代物流产业体系过程中起着非常重要的作用。云南省作为我国面向南亚、东南亚的重要门户,其省内物流网络布局对本省现代物流业发展、国民经济发展均具有重要意义。因此,本文以云南省物流网络结构为研究对象,基于物流能力评价结果构建轴辐式物流网络,并利用系统动力学仿真方法预测不同网络结构方案下的物流发展水平,验证物流网络布局的合理性,为云南省优化物流网络布局、提升物流业及
In this work,a facile “carbonization-activation” strategy is developed to synthesize N,P-codoped hier-archical porous carbon.Phosphoric acid is innovatively introduced during the hydrothermal process to achieve in-situ P doping as well as create abundant
随着无人驾驶等新兴交通领域研究的飞速发展,高速公路中的无人驾驶车辆编队构成了一种由直线型道路所决定的链状拓扑无线网络,车辆间进行数据交互过程中可能存在高维度的庞大数据。这种计算密集型任务虽然数据规模非常大,但其具有可并行处理和可任意划分的特性,可分负载调度模型可将任务根据网络中节点处理能力和通信能力分发给网络节点。可分负载调度模型可得到最优解的解析解,由于节点在链状拓扑无线网络中位置关系,在链状拓
Graphene oxide (GO),a new and promising material,has been widely used as a co-catalyst in photocat-alytic reactions;however,its capacity as a sole photocatalyst has rarely been investigated.In this study,ultraviolet (UV) light irradiation was used as a mo
由于盐湖地区的产业发展对交通基础设施提出了更高的要求,环境变化使得盐湖地区的盐岩卤水路基病害多发。为解决这些关键问题,本文提出使用石灰和粉煤灰等无机结合料提高盐岩的力学强度和抗溶蚀性能,形成石灰粉煤灰稳定盐岩混合料作为路面基层材料。本文在研究过程中采用有约束的配方均匀设计方法,在较大取值范围内得出了石灰与粉煤灰掺量变化与混合料7d无侧限抗压强度、温缩系数和干缩系数的回归关系,回归结果表明,合理剂量