气压烧结氮化硅陶瓷的研究与应用进展

氮化硅陶瓷具有高强度高硬度、耐磨、损耐腐蚀等优点,是一种综合性能优异的结构材料。气压法烧结氮化硅能够提高烧结温度从而促进氮化硅陶瓷的致密化,而且适于烧制异形件。因此,是一种经济、实用的重要烧结技术。本文论述了氮化硅陶瓷气压烧结的基本原理、工艺要求及烧结过程,在此基础上总结了气压烧结氮化硅陶瓷在陶瓷轴承、航空航天等领域的应用。

Improvement in Performance of Carbon-based Perovskite Solar Cells through Interface Modification with CTAC

Carbon-based perovskite solar cells have attracted much attention,due to their low cost,simple preparation process and high chemical stability.However,the devices exhibit low photoelectric conversion efficiency,owing to the presence of defects and interface impedance between the perovskite active layer and the contact interface.In order to minimize the interfacial defects and improve the charge transfer performance between the perovskite layer and the contact interface,cetyltrimethylammonium chloride(CTAC)was introduced into the lower interface of HTL-free carbon-based perovskite solar cells,because CTAC can be used as interface modification material to passivate the buried interface of perovskite and promote grain growth.It was found that CTAC can not only passivate the interface defects of perovskite,but also improve the crystalline quality of perovskite.As a result,the photovoltaic conversion efficiency of reaches 17.18%,which is 12.5%higher than that of the control group.After 20 days in air with 60%RH humidity,the cell can still maintain more than 90%of the initial efficiency,which provides a new strategy for interfacial passivation of perovskite solar cells.

高强度碱激发地质聚合物的热稳定性

以偏高岭土、水玻璃、氢氧化钠、去离子水为主要原料,通过碱激发反应制备出地质聚合物,研究了H2O与Al2O3摩尔比(M)对地质聚合物抗压强度的影响,以及地质聚合物在不同煅烧温度保温2 h后的质量变化、线收缩率和微观结构。结果表明:当M=13.02时,材料的抗压强度达到83.56 MPa;600℃之前材料的结构较为稳定,材料具有低的质量损失和线收缩;600℃保温2 h后材料的抗压强度和体积密度分别为83.27 MPa和1.34g/cm3。