摘要：针对ZL114A合金框架铸件的特点,分析了框架铸件铸造工艺要点,开展了ZL114A合金成分优化、合金组织细化、熔体处理、铸件铸造工艺方案设计、铸造CAE数值仿真技术及铸件热处理变形控制技术的研究。研制结果表明:通过采用高纯原料、合金成分优化、合金组织细化、合金熔体纯净化处理、热处理制度优化,使ZL114A合金的性能大幅度提高;铸件采用低压浇注方法,缝隙式浇注系统,厚大部位放置冷铁的铸造工艺,研制出的铸件内部质量优良,达到设计要求;通过设计热处理工装对框架支架铸件热处理淬火尺寸变形进行控制,结合采用液压静压力校正工艺,使铸件尺寸达到设计要求。

摘要：以ZL205A厚大舱体铸件为研究对象,针对舱体铸件的特点,开展了铸造工艺方案设计、铸造工艺方案数值仿真计算及熔体处理等技术的研究。研究结果表明:铸件采用差压浇注方法,低热量浇注系统,配合低热量浇注系统使用的冷铁,铸件实现了顺序凝固;铸件经检测,内部质量优良,切取试样力学性能远超过了指标值,各项指标均满足设计要求。

摘要：Covalent organic frameworks(COFs)with photoactive units have attracted significant interest in visible light photocatalysis and can present a metal‐free scenario for activating O_(2).As a typical photoactive unit,thiazolo[5,4‐d]thiazole(TzTz)has rarely been added to ***,circumventing the low reversibility of TzTz,it could be embedded into the building blocks beforehand,along with other bonds likeβ‐ketoenamine in forming *** was embedded into 1,1′‐biphenyl‐4,4′‐diamine(BD)using this approach to produce 4,4′‐(TzTz‐2,5‐diyl)dianiline(DTz).Under organobase‐modulated solvothermal conditions,combining 1,3,5‐triformylphloroglucinol(Tp)with BD and DTz resulted in the production ofβ‐ketoenamine‐linked TpBD‐COF and TpDTz‐*** TpDTz‐COF and TpBD‐COF are ***‐COF possessed more adequate separation and charge migration than TpBD‐*** resulted in superior performance for the blue light photocatalytic selective oxidation of benzylamine with O_(2).Furthermore,with O_(2) as the main oxidant,a wealth of benzylamines could be converted into imines over TpDTz‐*** investigations substantiate that oxidation of benzylamines obeys an electron transfer pathway,in which superoxide anion(O_(2)•–)is the crucial reactive oxygen *** study highlights the superiority of TzTz‐embedded COFs in developing effective photocatalytic systems for organic transformations.