Influence of Cr2O3 additive and sintering temperature on the structural characteristics and piezoelectric properties of Bi4Ti2.95W0.05O12.05 Aurivillius ceramics

In this paper, Cr_2O_3(0–0.4 wt%) as an additive was added into Bi_4Ti_(2.95)W_(0.05)O_(12.05)(BITW) for preparing a kind of W/Cr co-doped BIT(BITW-yCr) Aurivillius ceramics, both W~(6+) and Cr~(3+) are considered to substitute Ti~(4+) in the [TiO_6] octahedron of BIT. Besides the orthorhombic Bi_4Ti_3O_(12) as the major phase, BITW-yCr ceramics also contain the cubic Bi_2Ti_2O_7 as the second phase which was formed due to the doping effect of WO_3, but its formation could be depressed by the addition of less Cr_2O_3. Additionally, the cell parameters of BITW ceramics are also changed by the incorporation of Cr_2O_3, as the distortion degree of the orthorhombic structure(a/b)increases firstly and then decreases with its addtional amount(y). On the other hand, the grain growth of BITWyCr ceramics is mainly controlled by the sintering process, there a higher sintering temperature results in a larger grain size. In comparison to BIT ceramics, BITW-yCr ceramics with less Cr-addition(y=0–0.2) require a higher sintering temperature to attain the best dense state, moreover, as y increases, the sintering temperature to gain the highest piezoelectric activity also increases. Finally, BITW-0.2Cr which was sintered at 1150 °C exhibits a higher piezoelectric activity than the others, which could be attributed to its larger orthorhombic distortion and larger grain size, its ideal piezoelectric constant(d_(33)=28pC/N) provides it with great applying potentiality.     

Microstructural evolution and growth kinetics of thermally grown oxides in plasma sprayed thermal barrier coatings

The formation of thermally grown oxide(TGO) during high temperature is a key factor to the degradation of thermal barrier coatings(TBCs)applied on hot section components. In the present study both the Co Ni Cr Al Y bond coat and Zr O_2-8 wt.% Y_2O_3(8YSZ) ceramic coat of TBCs were prepared by air plasma spraying(APS). The composition and microstructure of TGO in TBCs were investigated using scanning electron microscopy(SEM), energy dispersive spectroscopy(EDS) and X-ray diffraction(XRD) analysis. The growth rate of TGO for TBC and pure BC were gained after isothermal oxidation at 1100 °C for various times. The results showed that as-sprayed bond coat consisted of β and γ/γ'phases,β phase reducesd as the oxidation time increased. The TGO comprised α-Al_2O_3 formed in the first 2 h. Co O, Ni O, Cr_2O_3 and spinel oxides appeared after 20 h of oxidation. Contents of Co O and Ni O reduced while that of Cr_2O_3 and spinel oxides increased in the later oxidation stage.The TGO eventually consisted of a sub-Al2O3 layer with columnar microstructure and the upper porous CS clusters. The TGO growth kinetics for two kinds of samples followed parabolic laws, with oxidation rate constant of 0.344 μm/h~(0.5) for TBCs and 0.354 μm/h0.5for pure BCs.     

陶瓷膜管与铁磁膨胀合金的连接工艺研究

对陶瓷膜管两端镀镍，用含PbO-B2O3-SiO2高铅基玻璃钎焊粉，在SG2—7．5—12设备上实现了陶瓷膜管与铁磁膨胀合金的连接。     

Ceramic Ultra Filtration Membrane Bioreactor for Domestic Wastewater Treatment

IntroductionThe membrane bioreactor system was firstused by Smith et al[1] to filter activated sludge inthe 1 960 s. Since then,membrane manufacturingtechniques have improved and the membranebioreactor for wastewater treatment has beendeveloped and improved[2 7] . The performance of amembrane bioreactordepends to a large parton themembrane characteristics[8,9] .Although differenttypes of membrane bioreactors have been studiedfor and even applied to a variety of waste watertreatment problems,t…     

共沉淀法超精细陶瓷微粉的制备与烧结

本实验主要是应用化学共沉淀法制备超细易烧的「ＭｇＯ－Ｙ２Ｏ３」－ＺｒＯ２粉末。通过实验得知：烧结特性对于快速沉淀，清洗十分敏感，通过改进实验方法，获得一种制备工艺简单，可用常规烧结，适用生产的方法。     

楔横轧模具CAD/CAPP集成化信息模型

针对楔横轧模具的特点,提出了基于特征的楔横轧模具CAD/CAPP集成化信息模型的建模方法及其结构.并应用该信息模型对一典型对称楔横轧模具进行实例化分析,结果表明该特征信息模型不仅能清楚地反映了模具的基本组成结构,而且完整地描述了楔横轧模具的加工工艺信息.     

ZrO_2－TiO_2多孔陶瓷膜的制备研究

以Ｔｉ（ＯＣ４Ｈ９）４和Ｚｒ（ＮＯ３）４·５Ｈ２Ｏ为前驱物，用Ｓｏｌ－ｇｅｌ方法制备ＺｒＯ２－ＴｉＯ２多孔陶瓷膜，研究了不同Ｚｒ／Ｔｉ比和浓度对ＺｒＯ２－ＴｉＯ２干ｇｅｌ的影响．研究了不同Ｚｒ／Ｔｉ比和烧结过程对ＺｒＯ２－ＴｉＯ２多孔陶瓷膜结构的影响．制备出了孔径小（约１８ｎｍ）、孔径分布很窄、孔隙率较高（约３６％）、面积较大的ＺｒＯ２－ＴｉＯ２多孔陶瓷膜     

尖晶石结构ZnLiFeO4材料导电特性的研究

用固相反法制备ＺｎＬｉＦｅＯ４导电陶瓷材料．研究烧结工艺、Ｌｉ的添加量对导电陶瓷材料导电特性的影响．在氮气氛下１４００℃烧结，可获得电导率为９×１０－３Ω·ｃｍ尖晶石结构的导电陶瓷材料．     

WRD的特性及其响应因子的校正

本文介绍了楔环阵列探测器（ＷＲＤ）的特性，理论上论述了ＷＲＤ线性响应因子校正的方法，并从实验上获得验证。