高温下稳定的钛酸铝材料的研究

运用正交试验法，从钛酸铝材料热稳定性能出发，寻找高温下稳定的钛酸铝材料的最佳工艺参数；得出了各参数对其热稳定性的影响趋势和实验条件下的最佳工艺参数值。     

高温烧结炉用堇青石一莫来石耐火砖结合剂研究

采用反应烧结法制备了高温烧结炉用堇青石一莫来石耐火砖,研究了不同结合剂对耐火砖组织结构和性能的影响.结果发现,与黏土结合剂在烧结过程巾有大量莫来石相生成相比,堇青石质结合剂在烧结过程中有大量新生相堇青石生成,热膨胀系数和抗折强度普遍较低,气孔率和热震稳定性较高,随着堇青石质结合剂含量的增加,热膨胀系数逐渐减小,气孔率和...     

全铝与钢-铝混合车身轻量化的连接技术探讨

铝合金的应用比重有所增大,会导致传统钢制车身逐渐转向全铝、钢-铝混合车身。而随之材料匹配方式也将会从钢钢组合转变成全钢组合、全铝组合、钢-铝组合等多种方式,涉猎同种与异种材料之间的有效连接。铝合金的物理化学属性会直接造成焊接性大大降低。而传统电阻焊和弧焊工艺根本不能满足铝合金连接与应用需要,所以,深层开发并熟练应用新型铝合金连接工艺势在必行。通过对主流车型全铝与钢-铝混合车身的轻量化材料、连接技术的应用现状分析,把铝合金主流连接工艺划分成焊接、机械连接、粘接三种类型,对其工艺、技术优势以及实际应用做了深入探究,以期能够为轻量化车身设计与制造奠定坚实的基础。     

铝活塞的挤压铸造

概述了挤压铸造技术的发展情况。重点评述了铝活塞挤压铸造工艺特点及其优势以及此技术在实际中的应用。     

锂离子电池负极材料钛酸锂的研究进展

尖晶石型钛酸锂（Li4Ti5O12）在充放电过程中具有较高的安全性和结构稳定性,被认为是非常有潜力的锂离子电池负极材料。本文从工业应用的角度分析总结了目前Li4Ti5O12的主要制备方法及其优缺点、Li4Ti5O12的改性方法及其特点,并对钛酸锂材料今后的研究重点进行了预测。     

原位自生颗粒增强BH135活塞材料的组织与高温力学性能研究

将KFB4、K2TiF6混合盐加入到BH135合金熔体中通过原位合成反应制备了TiB2颗粒增强BH135铝基复合材料。光学显微镜、扫描电子显微镜对材料的微观组织结构分析表明TiB2颗粒尺寸在200nm左右,其均匀分布与晶界及α-Al初晶内。高温拉伸试验表明复合材料在300？C的抗拉强度较基体合金提高了30%,其值为160MPa,且复合材料的断裂方式为韧性断裂。复合材料高温性能提高的机理在于原位自生纳米级颗粒的加入,提升了复合材料晶界及α-Al初晶的高温强度。     

17-4PH钢激光辐照组织的透射电镜微观分析

对17-4PH钢进行固溶+高温时效处理后,再进行激光辐照+低温时效处理,利用透射电镜(TEM)对每步工艺下材料的微观组织进行了分析.结果表明:17-4PH钢经固溶+高温时效后,析出强化相ε-Cu和NbC(N),尺寸介于20～30 nm,并形成逆转变奥氏体;激光辐照+低温时效后,强化相ε-Cu和NbC(N)的尺寸小于20 nm,位错密度很高,激光辐照时间对组织影响不大.     

基于热处理工艺的羽毛球拍杆用铝基复合材料性能研究

对不同热处理工艺下羽毛球拍杆用铝基复合材料的物理性能进行了实验分析,所采用的热处理工艺分别有单级固溶+单级时效、双级固溶+单级时效、单级固溶+双级时效、双级固溶+双级时效四项方案,分别测试铝基复合材料在不同处理工艺下的耐磨损性能、阻尼性能及抗弯刚度性能.经实验研究发现,440℃x1.5 h+480℃x0.5 h双级固溶...     

Electrophoretic Deposition of TiO2/Nb2O5 Composite Electrode Thin Films for Photovoltaic Application

Nano sized powders of TiO2 （titanium dioxide） and Nb2O5 （Niobium （V） oxide） were used to fabricate TiO2/Nb2O5 composites thin films by EPD （electrophoretic deposition） technique. The metal oxide powders, together with magnesium nitrate hexahydrate pellets, were suspended in propan-2-ol inside an EPD cell. The electrodes, placed 1.2 cm apart, were partially immersed in the suspension and a DC potential applied across them. Key EPD process parameters, which include applied DC electric field, deposition time and solid concentration in suspension, were optimized through visual inspection and from UV-Vis-NIR spectrophotometer spectra. The highest （55%） transmittance was obtained for films with deposition time of 90 s, powder concentration of 0.01 g/40 mL, and 35 V DC （direct current） voltage. XRD micrographs confirmed that TiO2 and Nb2O5 particles were presented in the composite film. SEM （scanning electron microscope） micrographs of the composite electrode thin films showed that porous films of high quality with well controlled morphology were deposited by using the EPD technique.     

钒基催化剂NH3-SCR低温反应特性研究

利用固定床反应器及原位漫反射傅里叶变换红外光谱仪,通过稳态及瞬态反应,研究了v205-wO,rri02催化剂低温NH3选择性催化还原(SCR)机理及低温活性的影响因素.结果表明:低温时,V205-WO3l'iO2 SCR催化剂首先吸附气态NH3,形成吸附态NH3nnH4．,然后吸附态NH3vnh^和气态NO反应,生成N...     

小型超高温梭式窑的研制

介绍使用温度１８００℃的小型高温梭式窑，可用于科研实验及一些小型制品的烧成，如将关键技术移植可用于大型梭式窑。其主要特点是使用轻质高温耐火材料窑墙厚度低于２００ｎｍ，先进的余热回收利用技术，空气预热温度达５００℃，１６００℃以上升温速率可达８０℃／ｈ以上，使用预混式调温高速烧嘴实现先进的二次燃烧技术，燃烧产物中ＮＯｘ生成量较低，有利于对环境的保护。     

Effects of surface lithiated TiO2 nanorods on room-temperature properties of polymer solid electrolytes

Polymer solid electrolyte with high ionic conductivity at room-temperature is most likely to be widely used in solid-state lithium batteries. In this work, the novel surface lithiated TiO₂ nanorods were firstly used as ionic conductor in polymer solid electrolyte. The surface lithiated TiO₂ nanorods-filled polypropylene carbonate polymer composite solid electrolyte (CSE) has an uniform composite structure with a thickness of about 60 μm. The ionic conductivity at room-temperature is 1.21 × 10⁻⁴ S cm⁻¹ and the electrochemical stability window is up to 4.6 V (vs Li⁺/Li). The assembled NCM622/CSE/Li solid-state battery shows a stable cycle performance with a retention capacity of 120 mAh g⁻¹ after 200 cycles at the current density of 0.3 C and a high coulomb efficiency of 99%. Compared with TiO₂ particles, this novel surface lithiated TiO₂ nanorods can provide more continuous ion transport channels and more Lewis acid-base reactive sites, provide a novel way to enhance the lithium ion transport in polymer solid electrolyte.     

Influence of TiO2/TiC composite materials with different crystal structures on the electrochemical properties as sulfur-loaded matrix for lithium-sulfur batteries

Lithium-sulfur battery is a type of high-performance chemical power supply system, and the structure of composite substrate material will influence on the electrochemical properties of sulfur cathode active materials. In this paper, a TiO₂/TiC composite substrate material with the different crystal structure by means of changing sintering temperature is synthesized and its physical properties and electrochemical performances have been researched. Through X-ray diffraction analysis, it can be found that the crystal structures of TiC and TiO₂ in the TiO₂/TiC composite substrate material sinter at different temperature both have been changed obviously due to the strong interaction between the oxygen atom and titanium and carbon atoms. By comparison, when sintering at 600°C, the composite matrix material has higher crystallinity and they accordingly have some confusion after sintering at 500°C. Raman spectrum information displays that TiO₂/TiC composite substrate materials with high crystallinity allow the loaded sulfur to enter the pores and it is easier to form a stable physical adsorption. However, TiO₂/TiC composite substrate material with some confusion is easier to form chemical adsorption with sulfur. Electrochemical test results illustrate that the specific discharge capacities of TiO₂/TiC composite substrate material with the higher crystallinity loaded 55% sulfur can be achieved to 1247.91 and 834.62 mAh g⁻¹ at 0.1 and 0.5C, respectively. Then, after 300 times charge and discharge cycles at 0.2C, the discharge capacity retention rate of TiO₂/TiC composite substrate material with some confusion loaded 45% sulfur can reach 54.40%. To sum up, we can conclude that the TiO₂/TiC composite materials with different crystal structures will have a serious impact on the electrochemical performances of sulfur cathode for lithium-sulfur batteries.     

以工业级锐钛型TiO2为载体V2O5-WO3型催化剂脱氮性能试验研究

为降低脱氮催化剂成本,以工业级锐钛型TiO2为载体,制备V2O5-WO3/TiO2型烟气脱氮催化剂,在自制催化反应器中测试其活性,研究反应温度、空速比、O2浓度、NO浓度、NH3/NO比及V2O5含量等对NO、NO2和N2O转化的影响,采用BET、FT-IR、SEM和XRD等进行微观表征,并与商业催化剂进行比较.结果表明以工业级锐钛型TiO2为载体的催化剂成本较低,在电站锅炉对于脱氮要求不太高的场合还是可行的.     

整体型V2O5-WO3-MoO3/TiO2催化剂的制备

采用静态氮物理吸附法、X射线衍射及扫描电镜对自行研制的V2O5-WO3-MoO3/TiO2催化剂进行了物化性能表征测定,并在固定床连续积分反应器上进行了活性评价,研究了V2O5、WO3、MoO3等成分的含量对催化剂活性的影响,以及催化剂制备过程中浸泡时间、浸泡液浓度、温度等因素对催化剂负载量的影响.结果表明：催化剂活性成分及助剂比例均存在着最佳值,试验制备的催化剂V2O5/TiO2最佳比例为3%左右,WO3/TiO2比为15%,MoO3/TiO2比为30%;浸泡时间、浸泡液浓度对催化剂负载量的影响基本上呈指数衰减,在足够长的时间内,浸泡液温度只影响催化剂的负载速度,而对于负载量的影响可以忽略.     

Al(H2PO4)3对玻化微珠保温材料性能的影响

研究了结合剂Al(H2PO4)3对玻化微珠保温材料抗折/耐压强度、重烧线变化率和体积密度等性能的影响。     

Facile synthesis of MoS2 QDs/TiO2 nanosheets via a self-assembly strategy for enhanced photocatalytic hydrogen production

The MoS₂ quantum dots (QDs) were interspersed on anatase TiO₂ nanosheets with exposed (001) facets by a facile self-assembly strategy. As expected, the MoS₂ QDs/TiO₂ nanosheets display an excellent photocatalytic performance for hydrogen production, and its hydrogen evolution rate is 139 μmol/h/g. More importantly, the hydrogen evolution rate of MoS₂ QDs/TiO₂ nanosheets is almost 4-fold in comparison to that of nude TiO₂ nanosheets. Based on the detailed characterizations, it can be obtained that the improved photocatalytic activity for hydrogen production can be ascribed to the particular characteristics of MoS₂ QDs, which can intensify the photo-absorption efficiency of TiO₂ nanosheets and enhance the separation and transfer efficiency of photo-excited charge carriers. It is anticipated that this work provides a novel paradigm to fabricate the highly-efficient photocatalysts for hydrogen evolution.     

锅炉高温腐蚀原因分析

本文针对潍坊电厂1#炉的高温腐蚀情况,根据运行及试验数据,对高温腐蚀的原因进行了分析,为锅炉的安全运行提供了理论依据。