高性能隧道防火涂料的产业化推广

鉴于隧道火灾特点及其危害性,隧道防火的重要性与日俱增。涂装隧道防火涂料是隧道防火的有效方法,文中简述了隧道防火涂料的防火机理,研制原则及制备流程。福建省防火阻燃材料重点实验室开展隧道防火涂料的研制,项目产品DP-3型混凝土隧道防火涂料完成在厦门大平公司的中试,并投入市场,产生良好的社会、经济效益,实现了隧道防火涂料成果产业化推广。该涂料已应用于数十项隧道工程的防火涂装,均一次性通过项目验收,获得优良评价

硬质合金深冷处理研究进展

硬质合金自1923年问世以来,人们主要通过改进其烧结工艺、制备超细WC-Co复合粉末以及表面强化等方法来不断优化它的性能。然而,由于上述方法存在设备复杂、制备成本高、技术难度大等问题,在一定程度上制约了我国硬质合金产业的转型升级。深冷处理作为一种低能耗、无污染、操作便捷的新型材料改性技术,能够有效提高材料的力学性能、耐磨性、尺寸稳定性、耐腐蚀性以及导电/导热性等多种性能,并在多种材料的产业化方面得到了成熟的应用。因此,将深冷处理用于优化硬质合金的性能,能够有效避免传统改性方法的不足,为高效、低成本地改善硬质合金性能提供了新的工艺路线。然而,由于硬质合金的深冷处理研究起步较晚,因此其深冷处理工艺和改性机理两方面依然面临诸多问题。近年来,人们在实验室研究了硬质合金经深冷处理后各方面性能的变化,同时对深冷处理工艺参数与宏观性能变化的影响规律,以及宏观性能发生变化的微观机制开展了深入的研究,并取得了一定的成果。大量试验表明,深冷处理能够显著改善硬质合金的抗弯强度、耐磨性和切削性能,可有效延长硬质合金工具的使用寿命,而对其硬度和韧性影响不大。硬质合金性能的改善效果与深冷处理工艺参数密切相关,较低的深冷处理温度与较长的保温时间有利于其性能的提高,但是硬质合金性能并不随深冷处理温度的降低和保温时间的延长而呈线性变化。一般而言,对于特定成分的硬质合金,存在最佳的深冷处理工艺参数。深冷处理对硬质合金服役性能的强化机制主要是黏结相Co的马氏体相变、η相的弥散析出以及材料表面残余应力状态的改变等方面。本文归纳了硬质合金深冷处理的研究进展,并结合本团队的研究工作,分别介绍了深冷处理对硬质合金的力学性能、服役性能、微观组织、残余应力等方面的影响,分析了深冷处理工艺参数对硬质合金的性能的影响规律,探索了微观组织、残余应力与性能之间的相互关系及作用机理。本文基于目前硬质合金深冷处理的研究现状及当前研究中存在的不足,对其未来的研究方向与产业化前景进行了展望。福建省自然科学基金(2018D0018);;福建省工业科技重大专项(2016HZ0001-9);;低温工程学重点实验室开放课题(CRYO201708);;中国科学院青年创新促进会(2016021)~

含氟硅低表面能共聚物的制备与表征

将丙烯酸六氟丁酯和γ-甲基丙烯酰氧基丙基三甲氧基硅烷与(甲基)丙烯酸(酯)进行共聚,合成含氟硅共聚物。用红外光谱(FT-IR)、X射线光电子能谱(XPS)和热重分析(TGA)对共聚物的结构和性能进行表征,并测试了共聚物膜的吸水率及对水和油的接触角。XPS结果表明,共聚物膜表面的F和Si元素相对物质的量明显高于150 nm深处,同时共聚物膜对水和油的静态接触角分别达到110°和80°以上,说明F、Si元素自组装迁移,形成了低表面能表面;TGA研究结果表明,共聚物膜的热分解温度从195℃提高到226℃,升温过程中分解速率明显降低。该含氟硅共聚物具有良好的热稳定性、低的吸水率和良好的疏水防污性

Production of renewable aviation fuel range hydrocarbons from sorbitol using aqueous phase aromatization

文章利用具有微、介孔双孔结构的机械混合分子筛催化剂(Ni/HZSM-5/SBA-15),在较温和的反应条件下,将山梨醇一步水相芳构化转化为航空燃料范围内的芳烃和环烷烃类碳氢化合物。采用X射线衍射(XRD)、透射电子显微镜(TEM)、N_2吸脱附实验、NH_3程序升温解吸(NH3-TPD)等技术对催化剂的结构、形貌和酸性质进行了表征分析。催化剂反应性能测试结果表明：反应温度为320℃时,油相产率达到42.0%,芳烃含量为69.7%；当反应温度升高到360℃时,油相产率增加到61.3%。油相产物主要由环烷烃、支链烷烃和芳烃组成,通过后续加氢脱氧提质,可以转化为高品质的生物航空燃油添加剂

Growth of Thick Ge Epitaxial Layers with Low Dislocation Density on Silicon Substrate by UHV/CVD

采用超高真空化学气相淀积系统,以高纯Si2H6和GeH4作为生长气源,用低温缓冲层技术在Si(001)衬底上成功生长出厚的纯Ge外延层.对Si衬底上外延的纯Ge层用反射式高能电子衍射仪、原子力显微镜、X射线双晶衍射曲线和Ra-man谱进行了表征.结果表明在Si基上生长的约550nm厚的Ge外延层,表面粗糙度小于1nm,XRD双晶衍射曲线和Ra-man谱Ge-Ge模半高宽分别为530″和5.5cm-1,具有良好的结晶质量.位错腐蚀结果显示线位错密度小于5×105cm-2.可用于制备Si基长波长集成光电探测器和Si基高速电子器件.Thick Ge epitaxial layers are grown on Si(001) substrates with low temperature buffer layers with ultra-high vacuum chemical vapor deposition systems using Si2H6 and GeH4 as precursors.The deposition process of the Ge layer on Si is investigated in real time by reflection high-energy electron diffraction,and the quality of the Ge layer was evaluated by atomic force microscopy,double crystal X-ray diffraction(XRD),and Raman measurement.The root-mean-square surface roughness of the Ge epilayer with a thickness of 550nm is less than 1nm and the full-width-at-half maximum of the Ge peak of the XRD profile and the Ge-Ge mode of the Raman spectra are about 530″ and 5.5cm-1,respectively.These measurements indicate that the Ge epitaxial layer is of good quality.The etch pit density related to threading dislocations is less than 5×105cm-2.This is a promising material for Si-based long wavelength photodetectors and electronic devices国家自然科学基金(批准号:60676027,50672079,60336010);; 福建省重点科技项目(批准号:2006H0036);; 教育部回国留学人员启动基金资助项目~

UHV/CVD法生长硅基低位错密度厚锗外延层

采用超高真空化学气相淀积系统,以高纯Si_2H_6和GeH_4作为生长气源,用低温缓冲层技术在Si（001）衬底上成功生长出厚的纯Ge外延层.对Si衬底上外延的纯Ge层用反射式高能电子衍射仪、原子力显微镜、X射线双晶衍射曲线和Ra-man谱进行了表征.结果表明在Si基上生长的约550nm厚的Ge外延层,表面粗糙度小于1nm,XRD双晶衍射曲线和Ra-man谱Ge-Ge模半高宽分别为530″和5.5cm~(-1),具有良好的结晶质量.位错腐蚀结果显示线位错密度小于5×105cm~(-2).可用于制备Si基长波长集成光电探测器和Si基高速电子器件

Study of nano-intercalation amino resin superficial modified tunnel fire proof coating

作者简介: 张小玲(1959-),女,厦门市消防支队 防火处高级工程师,主要从事消防监督管理工作, 福建 省厦门市湖滨北路119 号, 361012。[中文文摘]通过对主粘结剂、聚合物改性剂、骨料和无机阻燃剂等因素的研究,得到改进的常规厚涂型防火涂料,在其表面涂覆纳米插层氨基树脂以改善其耐腐蚀性。以原位插层法制备了蒙脱土/氨基树脂纳米复合材料,采用X射线衍射(XRD)、断面扫描电镜(SEM)及透射电镜(TEM)研究了其分散形态。试验表明通过表面涂覆改性得到的隧道防火涂料组合物具有良好的耐腐蚀性和耐火性能。[英文文摘]Via the investigation on factors such as main adhesive, polymeric modifier, bond materials and inorganic fire retardant, the performance of thick coated fire proof coating is improved. Surface modification by nano-intercalation amino resin improves the anti-corrosion property of the fire proof coating. The montmorillonite/amino resin nano-meter composite is made by the method of in-situ intercalation, and its dispersion morphology is analyzed by XRD, SEM and TEM. The experiments prove that the nano-intercalation amino resin modified fire proof coating performes well in fire proof and anti-corrosion

Effect of organic-inorganic composite binding materials on steel structure fire retardant coating

[中文文摘]以硅酸盐类凝胶材料为主粘接剂,采用有机无机复合方法,通过聚合物和改性水玻璃对主粘接剂进行改性,使涂层兼具水泥的刚性和聚合物的柔性,提高其粘结性、耐水性和柔韧性,克服涂层高温或骤冷条件下易爆裂、脱落,常温下易粉化、受潮、附着力差等缺点;理化性能测试和高温燃烧实验表明,防火涂层具有优良的耐火性能,与基材粘接性能良好。[英文文摘]In the steel structure fire-retardant coating silicate gel materials is as primary binder,which is modified by polymer and modified sodium silicate using organic-inorganic compound method.After modification,the coating possesses stiffness of cement and flexibility of polymer at the same time.The adhesive strength of coating increases as well as resistivity against water and flexibility.The coating is not easy to burst or scale off under high temperature or shock cooling condition.It is also hard to be chalked,wetted under room temperature condition. The physicochemical properties testing and combustion experiments prove that modified fire-ret ardant coating has good fireproof performance, and high adhesive strength to protected backing .福建省科技重点项目(2007T0013,2006I0026); 厦门市科技计划项目(3502Z20073006

Amplitude analysis of the decays D0 → π+π−π+π− and D0 → π+π−π0π0*

Using e+e− annihilation data corresponding to an integrated luminosity of 2.93 fb−1 taken at the center-of-mass energy √s = 3.773 GeV with the BESIII detector, a joint amplitude analysis is performed on the decays D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η). The fit fractions of individual components are obtained, and large interferences among the dominant components of the decays D0 → a1(1260)π, D0 → π(1300)π, D0 → ρ(770)ρ(770), and D0 → 2(ππ)S are observed in both channels. With the obtained amplitude model, the CP-even fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are determined to be (75.2 ± 1.1stat. ± 1.5syst.) % and (68.9 ± 1.5stat. ± 2.4syst.)%, respectively. The branching fractions of D0 → π+π−π+π− and D0 → π+π−π0π0 (non-η) are measured to be (0.688 ± 0.010stat. ± 0.010syst.)% and (0.951 ± 0.025stat. ± 0.021syst.)%, respectively. The amplitude analysis provides an important model for the binning strategy in measuring the strong phase parameters of D0 → 4π when used to determine the CKM angle γ(φ3) via the B− → DK− decay