BaCO3基低温共烧陶瓷基板工艺及性能分析

对用于封装的BaCO3基低温共烧陶瓷基板LTCC材料进行了研究,包括组分配制以及陶瓷制备工艺研究。对烧结后陶瓷的部分热性能以及力学性能进行了测试。结果表明:BaCO3基低温共烧陶瓷较为致密的密度在3.8～4.2g/cm3,在900℃烧结的陶瓷机械形变较小。     

基于黏弹性理论液相共烧结模型的建立及应用研究

目前液相共烧结工艺相容性问题是限制功能梯度材料制备技术的关键问题之一,研究其理论模型具有重要的意义。基于现有液相烧结、液相迁移和固相共烧结模型的分析,提出了以颗粒半径、相对密度和液相体积分数为基本参数的液相共烧结模型,模拟预测了液相共烧结两端异种材料致密化和液相迁移的过程,并通过YG类硬质合金实验加以验证。实验结果表明：共烧结试样界面两端材料的密度及Co含量呈现梯度变化,其梯度分布与计算拟合的变化趋势一致,本研究建立的模型较准确地预测了YG8梯度硬质合金Co含量和密度沿梯度方向的变化规律。     

烧结应力的缓冲及Al2O3/不锈钢微滤膜的制备

以多孔不锈钢片为基体、以氧化铝粉体(平均粒径0.5 μm)为膜材料, 用三种工艺制备了Al₂O₃/不锈钢微滤膜。采用扫描电子显微镜和金相显微镜分别对样品表面和断面形貌进行了表征, 用毛细流动法测定了Al₂O₃/不锈钢膜的孔径分布, 并通过超声震荡法考察了膜的附着力。研究表明, 在基体与氧化铝涂层间预洗引入一层不锈钢细粉作为过渡层再进行共烧结,有效地解决了Al₂O₃膜层易于剥落的问题, 并成功制备了Al₂O₃/不锈钢复合微滤膜, 膜厚为40~50 μm。该不锈钢粉末过渡层不仅可以修饰基体表面, 还能够缓冲Al₂O₃层在热处理过程中产生的热膨胀和烧结收缩应力, 并对Al₂O₃层和不锈钢基体产生粘结作用, 提高了膜的附着力。本工作所采用的共烧结法既简化了制备工艺, 又节约了能源。共烧结温度是影响膜附着力与孔径分布的关键因素, 经1100、1150、1200和1250℃共烧结, 所制备的Al₂O₃/不锈钢膜平均孔径为0.2、0.3、0.5和3.9 μm, 其纯水通量分别为3.8、4.1、6.9和20.5 m³/(m²·h·bar)。     

YSZ/Al2O3/YSZ多层陶瓷叠层制备方法的研究

本文分别采用三种叠层方式制备YSZ/Al2O3/YSZ多层陶瓷,通过实验得出:由于YSZ与Al2O3陶瓷烧结性能的差异,导致YSZ与Al2O3陶瓷叠层共烧时容易分层翘曲,YSZ与Al2O3主要依靠层间的物理啮合作用而结合。通过在流延YSZ层与丝网印刷Al2O3层之间增加印刷YSZ过渡层的叠层方法,可以改善YSZ流延层与Al2O3丝网印刷层之间的结合,而得到结合良好的YSZ/Al2O3/YSZ多层陶瓷共烧结合界面。     

用涂布共烧结法制备固体氧化物燃料电池

以８％Ｙ２Ｏ３稳定的超细ＺｒＯＺ２（８ＹＳＺ）粉末为固体电解质材料，以喷雾热解法制备的超细Ｌａ０．８Ｓｒ１－ｘＭｎＯ３、（２０ＬＳＭ）粉末为空气极电极材料，以ＮｉＯ／８ＹＳＺ粉末为燃料电极原料，采用浆料涂层共烧结法制备电极薄膜，并组装了固体氧化物燃料电池（ＳＯＦＣ）。在Ｈ２－Ｎｉ－８ＹＳＺ－２０ＬＳＨ－Ａｉｒ体系中，分别测定了８００℃用１０００℃时的开路电压及电池Ⅰ—Ⅴ特性曲线。     

Effects of electrolytic manganese residue (EMR) to co-sintering mechanism of ceramic aggregate

The influences of co-sintering temperature on the physical properties of EMR (electrolytic manganese residue) ceramic aggregate were investigated over the gradient of co-sintering by EMR, CFA (coal fly ash), and P (perlite) that were used as raw materials. Seven EMR samples were prepared to sinter at different temperatures that were decided by the data of a thermal mass spectrometer, and four ceramic aggregate embryos were sintered at 1120, 1140, 1160, and 1180°C. The mechanisms of co-sintering temperature action on performance were determined by means of X-ray diffraction and scanning electron microscopy with energy-dispersive X-ray spectroscopy. The optimal temperature of 1160°C and the temperature increment lead to an enhancement of cylinder compressive strength and a damping of 1-h water absorption, softening coefficient, and grain shape coefficient was discovered. Gypsum of EMR dissolved and exhausted gas during co-sintering resulted in CaO. The crystalline transformation of wollastonite and gehlenite produced anorthite, which boosts the strength of aggregate and the content of anorthite, was proportional to the co-sintering temperature and the pressure strength of cylinder. The liquid phase of “overfiring”-coated crystal contributed to the further improvement of strength, but the aggregate sphere deformation generated a reduction of comprehensive performance. The formation of bustamite calcian in co-sintered ceramic aggregate realized the solidification of Mn, and the solidification rate of leaching toxicity test was 99.92%, and the absence of radioactivity was demonstrated.     

High-flux whisker layer ceramic membrane prepared by gel spin-coating method for low-pressure oil/water emulsion filtration

Insufficient permeability and membrane fouling significantly influence the efficiency of ceramic microfiltration (MF) membranes in oil/water emulsion treatment. In this study, a high-flux whisker layer ceramic MF membrane with super-hydrophilicity was successfully fabricated through gel-spin coating method and a low-temperature oxidation method, which was used to separate oil/water emulsion. The effects of the whisker layer and surface wettability were systematically investigated, and the mechanism of in-situ gelling and pore size distribution was proposed. The super-hydrophilic ceramic MF membrane with an average pore size of 250 nm exhibited a high gas flux of 934 m³/(m²·h·bar) and excellent pure water flux of 9754 L/(m² h bar). Even after a long-term circulating filtration process, the super-hydrophilic ceramic MF membrane still maintained a high water flux of over 50 L/(m²·h) at a transmembrane pressure of 5 KPa during the treatment of oil-in-water emulsion with a concentration of 1000 mg/L. Overall, the developed ceramic MF membrane demonstrated high permeability and excellent anti-fouling performance, making it a promising candidate for oil/water emulsion wastewater treatment.     

高温共烧铂电极浆料的制备研究

汽车所用的片式氧传感器需要多层高温共烧结制备,烧结温度大于1500℃,如此高的烧结温度对铂电极浆料的耐热性提出较高的要求,要求反应铂电极浆料有较高耐热性能,高温烧结收缩较小,反应电极有高致密性多孔层叠的结构进而使得铂电极-YSZ-气体三相界面增长,使得片式氧传感器的氧敏响应性能和催化性能显著提高;要求加热铂电极要有致密的结构,阻值稳定,连续性好,长时间通电不易烧断。传统的铂电极浆料烧结温度为800~1200℃,明显不能满足高温烧结的需要。本文研究制备了适用于高温烧结的铂反应电极浆料和铂加热电极浆料。     

LTCC铁氧体叠层片式器件及材料的国内外发展动态

根据最近(2008.10.10)举行的第十届国际磁铁氧体会议(ICF10)和第十三届全国磁学会议(2008.10.31)资料,以及近两年有关专业会议文献,综合介绍了近期国内外制作叠层片式电感、滤波器和变压器的LTCF(低温共烧铁氧体)工艺、低温烧结NiCuZn、MnZn、Co_2Z、Co_2Y、BaM等铁氧体技术以及LTCC(低温共烧陶瓷)叠层片式电感的研发进展,展望了LTCC和叠层片式电感的发展趋势.     

流延-共烧法制备掺杂氧化铈基阳极／电解质双层结构

采用甘氨酸／硝酸盐（GNP）法合成了具有较高烧结活性的Ce0.8Gd0.05Y0.15O1.9（GYDC）粉体，通过流延-共烧法制备了NiO—GYDC阳极／GYDC电解质双层结构。结果表明：GYDC电解质薄膜经过1400℃保温4h后可烧结致密，说明GNP法制备的GYDC粉体的烧结活性较高；通过流延．共烧法可以成功制备外观完好、平整的NiO-GYDC／GYDC双层结构，满足SOFC的组装要求。