Meticulously tailoring phase boundary in KNN-based ceramics to enhance piezoelectricity and temperature stability

Although KNN-based ceramics with high electrical properties are obtained through a variety of strategies, the temperature sensitivity is still one of the key technical bottlenecks hindering practical applications. Here, we use a new strategy, meticulously tailoring phase boundary, to refine the ferroelectric boundary of KNN-based ceramics, leading to high piezoelectricity companied with improving temperature stability. The highest d₃₃ value in this system reaches 501 pC/N with a T_C ∼ 240°C, whereas a large strain of ∼0.134% can be kept with 10% lower deterioration until 100°C. The origin of high piezoelectricity is mainly attributed to the well-preserved multiphase coexistence and the appearance of nanodomains, which greatly facilitate the polarization rotation. Instead of the changed intrinsic thermal insensitivity, the precision phase boundary engineering plays an important role in strengthening the temperature stability of electric-induced strain. This work provides a simple and effective method to obtain both high electrical properties and excellent thermal stability in KNN-based ceramics, which is expected to promote the practical applications in the future.     

多场耦合下微波碳热氯化回收铟的动态仿真

以实验室微波反应器为研究对象,基于有限元软件COMSOL Multiphysics,采用多场耦合方法对微波强化碳热氯化回收In Cl3的反应过程进行了动态仿真,并分析了其影响因素。结合微波加热过程、计算流体力学和物质传输过程,建立了由射频、传热、传质和流场4个物理场耦合的数学物理模型。通过考察腔室内的电场强度,得到微波加热过程的热源项与样品体的温度分布。结果表明,本研究模型能够准确描述微波输入功率、HCl通入浓度等多因素对铟化物回收过程的影响,为微波碳热氯化提铟过程的分析提供新的方法与依据。     

用于金属密封联接的自动热压封接设备研制

针对手工作业难以保证铟封工艺的质量和一致性,研制了一台自动热压封接设备,用于实现某型号精密金属器件的密封。分析了金属铟封的热压工艺过程和工艺参数;介绍了自动热压封接设备的基本结构和控制系统;详细说明了设备温度、压力等工艺参数的控制方法,并对研制设备的压力、温度的控制性能进行了测试实验。使用研制的设备进行了热压铟封实验,并对连接的可靠性和密封性能进行了测试。结果表明,热压铟封后的金属器件符合产品要求。该设备能够保证精密金属器件的封接质量和一致性,提高了铟封工艺的自动化程度,提高了生产效率。     

Liquid‐Phase Exfoliated Indium–Selenide Flakes and Their Application in Hydrogen Evolution Reaction

Single‐ and few‐layered InSe flakes are produced by the liquid‐phase exfoliation of β‐InSe single crystals in 2‐propanol, obtaining stable dispersions with a concentration as high as 0.11 g L⁻¹. Ultracentrifugation is used to tune the morphology, i.e., the lateral size and thickness of the as‐produced InSe flakes. It is demonstrated that the obtained InSe flakes have maximum lateral sizes ranging from 30 nm to a few micrometers, and thicknesses ranging from 1 to 20 nm, with a maximum population centered at ≈5 nm, corresponding to 4 Se–In–In–Se quaternary layers. It is also shown that no formation of further InSe‐based compounds (such as In₂Se₃) or oxides occurs during the exfoliation process. The potential of these exfoliated‐InSe few‐layer flakes as a catalyst for the hydrogen evolution reaction (HER) is tested in hybrid single‐walled carbon nanotubes/InSe heterostructures. The dependence of the InSe flakes' morphologies, i.e., surface area and thickness, on the HER performances is highlighted, achieving the best efficiencies with small flakes offering predominant edge effects. The theoretical model unveils the origin of the catalytic efficiency of InSe flakes, and correlates the catalytic activity to the Se vacancies at the edge of the flakes.     

广西铟工业发展浅论

阐述广西铟工业的现状和发展趋势，提出发展技术含量高，附加值高的高科技产品，使铟资源优势转化为产业经济优势，提高铟工业的市场竞争力，同时应加强环境保护工作，使铟工业与生态环境保护协调发展，实现可持续发展，提出加快发展铟产品及相关高科技深加工产业的对策，产业规划和配套措施。     

发挥铟资源优势发展铟的高新产业

介绍了国内外铟的生产应用动态 .发挥我国铟资源优势 ,根据市场的需求 ,有计划地开发铟的高新技术产品 ,优化铟的产业结构 ,不至于浪费资源 ,并提高市场竞争能力 .     

金属铟提高Cu-Al合金抗失泽能力机理的研究

本文采用常规腐蚀试验与电化学试验方法以及金相、X射线衍线、电子探针等分析方法研究了含铟的Cu-Al合金在人工汗液中抗失泽能力的机理。结果表明,铟能细化合金的晶粒,并使合金呈现均匀腐蚀,减弱合金的择优取向;合金中存在富铟偏析相,这些相影响合金的失泽行为。     

粗铟真空蒸馏除镉的研究及生产实践

粗铟真空蒸馏除镉的试验结果表明，在450-500℃、真空度20-30Pa、蒸馏时间2h的条件下，除镉率可达97％～99％．生产实践表明，采用该工艺除镉，粗铟含镉可降至0．01％。除镉后的铟能够满足电解工艺对原料的要求．     

铟生产中锌含量的控制

研究了在铟生产中的置换过程和电解精炼过程中的酸度对锌含量的影响,以及锌含量的控制。在置换过程中,当酸含量控制在15～25g/L时,能控制反应的速度,从而降低粗铟中锌的含量;在电解精炼中,溶液的pH值为2～3,可使铟中锌的含量降低至0 5μg/g,并提出了采用硫酸或氢氧化钠来控制溶液酸度的方法;用海绵铟熔铸阳极时,采用NaOH熔炼的同时,加入NaCl能降低碱性熔渣的黏度,提高NaOH对Zn(OH)2、Na2ZnO2等的吸收能力,降低铟中锌的含量。