A New Combustion Process for Nanosized BaCe_(0.95)Y_(0.05)O_(3-δ) Powders

Nanosized BaCe_(0.95)Y_(0.05)O_(3-δ) powders with the homogeneous composition were synthesized by a new combustion process based on the Pechini method. A polymeric precursor sol was formed by use of citric acid and ethylene glycol as the chelating agents of metal ions. The perovskite-type BaCe_(0.95)Y_(0.05)O_(3-δ) powders with uniform shape and smaller than 40 nm in sized were obtained through the combustion of the polymeric precursor sol at the existence of nitric acid and ammonium hydroxide. It was found the particle size could be controlled by modulating the quantities of nitric acid and ammonium hydroxide, the quantities of the residue, carbonate ions were also affected by the quantities of the citric acid and ethylene glycol.

低温烧结纳米掺杂Ag-SnO_2电接触合金放电性能研究

利用化学共沉淀、高能球磨技术及热压烧结等方法制备出Fe掺杂纳米复合Ag-SnO2电接触合金,测定了纳米复合电接触合金密度、硬度、电阻率、耐电压强度、耐烧蚀性等基本物理性能,运用扫描电镜(SEM)对电性能测试前后组织进行观察分析。结果发现,Fe元素的加入,细化了纳米SnO2;Fe掺杂含量越多,纳米氧化物粒度越小,纳米复合电接触合金组织也越细小均匀,纳米复合电接触材料硬度、电阻率、平均耐电压强度和电弧寿命上升,截流值降低;且Fe掺杂对纳米复合电接触合金电弧烧蚀速率有明显影响。

Ag-ASQA复合抗菌剂的合成和性能评价

采用化学还原法,以硝酸银和过氧化氢为原料制备了粒径为30 nm～70 nm的纳米银粉无机抗菌剂。对氨乙基氨丙基二甲氧基硅烷(DL-602)进行酰胺化,再经季铵化反应制备了有机硅季铵盐类抗菌整理剂N,N-二甲基-N-(β-油酰胺乙基)-γ-氨丙基二甲氧基硅烷硫酸氢铵(ASQA)。最后,将纳米银粉与ASQA进行复配制得Ag-ASQA复合抗菌整理剂,测定了产物的抗菌性能,并与纳米银粉和ASQA进行性能对比。结果表明,Ag-ASQA复合抗菌整理剂与纳米银粉相比,抑菌率提高了近20%,抗皱回复角提高了约24%,白度提高了约4%,柔软性提高了2个级别;与ASQA相比,抑菌率提高了约78%,抗皱回复角提高了约13%。

稳定氧化锆固体电解质研究进展

稳定氧化锆作为固体氧化物燃料电池的电解质是最好的可用材料,介绍了这方面的研究进展,包括:纳米粉的制备,火花等离子体烧结法获得亚微米晶粒结构的高强度陶瓷,二次烧结前体清除法改善晶界的电导率和一个准三元系稳定的5% In2O3-8%Y2O3-ZrO2(式中均为摩尔百分数)。与准二元系稳定的8%Y2O3-ZrO2相比,该稳定氧化锆具有周期性晶格畸变大的各向异性和在实用温度范围不随老化松弛各向异性的特征,保证固体氧化物燃料电池工作时有稳定的和高的电效率。