Solid oxide fuel cell stacks with barium and strontium ceramic bodies
    62.
    发明授权
    Solid oxide fuel cell stacks with barium and strontium ceramic bodies 失效
    固体氧化物燃料电池堆叠有钡和锶陶瓷体

    公开(公告)号:US5807642A

    公开(公告)日:1998-09-15

    申请号:US699753

    申请日:1996-08-20

    摘要: A ceramic body based on barium and strontium titanates has a composition defined essentially by the formula Ba.sub.1-x Sr.sub.x TiO.sub.3, where x ranges from 0 to 1. The ceramic body is chemically and dimensionally stable in solid oxide fuel cell (SOFC) operation environments, which encounter oxidizing and reducing atmospheres at temperatures as high as 1,000.degree. C. In addition, the ceramic of which the body is comprised can be tailored to yield a ceramic in which the thermal expansion coefficient (CTE) is adjusted between 11.3.times.10.sup.-6 /.degree.C. and 12.4.times.10.sup.-6 /.degree.C. to match the CTE of the other SOFC materials, thereby avoiding the adverse effects of thermal stress. These features make the ceramic body especially suited for use as manifolds in SOFC stacks, or other non-electrical structural components, such as the inflow and outflow gas manifold materials, the stack housing, or other support structure or spacers in the stack, and the like.

    摘要翻译: 基于钡和钛酸锶的陶瓷体具有基本上由式Ba1-xSrxTiO3定义的组成,其中x的范围为0至1.陶瓷体在固体氧化物燃料电池(SOFC)操作环境中化学和尺寸稳定,其遇到 在高达1000℃的温度下氧化和还原气氛。此外,可以调整包含人体的陶瓷以产生陶瓷,其中热膨胀系数(CTE)在11.3×10 -6 /℃ 和12.4×10-6 /℃,以匹配其他SOFC材料的CTE,从而避免热应力的不利影响。 这些特征使得陶瓷体特别适合用作SOFC堆叠中的歧管或其它非电气结构部件,例如流入和流出气体歧管材料,堆叠壳体或堆叠中的其它支撑结构或间隔物,以及 喜欢。

    Ternary silicon-rare earth nitrides and process for their preparation
    63.
    发明授权
    Ternary silicon-rare earth nitrides and process for their preparation 失效
    三元硅 - 稀土氮化物及其制备方法

    公开(公告)号:US5292489A

    公开(公告)日:1994-03-08

    申请号:US720272

    申请日:1991-06-24

    摘要: This invention provides a compound having the formula LnSi.sub.3 N.sub.5 wherein Ln is selected from the group consisting of scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium, and lutetium. In addition, there is provided a method for making the compound Ln'Si.sub.3 N.sub.5 wherein Ln' is a radical selected from the group consisting of lanthanum, scandium, yttrium, cerium, praseodymium, neodymium, promethium, samarium, europium, gadolinium, terbium, dysprosium, holmium, erbium, thulium, ytterbium and lutetium, comprising the step of reacting SiO.sub.z, Ln'.sub.x O.sub.y in a nitrogen atmosphere in the presence of carbon at a temperature of from 1200.degree. C. to about 2000.degree. C. for at least 2 hrs., x being an integer equal to or greater than 2, y being an integer equal to or greater than 3, and z being an integer selected from 1 and 2, with the proviso that x and y are selected to result in a stable compound of Ln'.sub.x O.sub.y.

    摘要翻译: 本发明提供具有式LnSi 3 N 5的化合物,其中Ln选自钪,钇,铈,镨,钕,ium,钐,铕,钆,铽,镝,钬,铒,ium,镱和镥 。 此外,提供了一种制备化合物Ln'Si3N5的方法,其中Ln'是选自镧,钪,钇,铈,镨,钕,ium,钐,铕,钆,铽,镝的基团 钬,铒,ium,镱和镥,包括在碳存在下,在1200℃至约2000摄氏度的温度下,在氮气气氛中使SiO 2,L 1 O 10反应至少2小时的步骤 x是等于或大于2的整数,y是等于或大于3的整数,z是选自1和2的整数,条件是选择x和y以产生稳定的化合物 的Ln'xOy。

    Super tough monolithic silicon nitride
    65.
    发明授权
    Super tough monolithic silicon nitride 失效
    超坚固的单片氮化硅

    公开(公告)号:US5100847A

    公开(公告)日:1992-03-31

    申请号:US759970

    申请日:1991-09-17

    IPC分类号: C04B35/593

    CPC分类号: C04B35/5935

    摘要: A monolithic silicon nitride ceramic is densified at temperatures lower than 2000.degree. C. and heat treated at temperatures greater than 2000.degree. C. in the presence of at least 6.5 w % of multi-component sintering aids. This monolithic silicon nitride has a highly acicular microstructure Chevron Notch fracture toughness greater than 9 MPa.multidot.m.sup.1/2, R-curve behavior, high Weibull modulus, excellent damage tolerance, high thermal conductivity, and other desirable properties.

    摘要翻译: 整体式氮化硅陶瓷在低于2000℃的温度下致密化,并且在至少6.5w%的多组分烧结助剂的存在下,在高于2000℃的温度下进行热处理。 这种单片氮化硅具有高度针状微观结构,Chevron Notch断裂韧性大于9 MPaxm1 / 2,R-曲线行为,威布尔模量高,耐损伤性好,导热性好等优点。

    Preparation of lanthanum chromate powders by sol-gel
    66.
    发明授权
    Preparation of lanthanum chromate powders by sol-gel 失效
    通过溶胶 - 凝胶法制备铬酸镧粉末

    公开(公告)号:US5061402A

    公开(公告)日:1991-10-29

    申请号:US515787

    申请日:1990-04-25

    摘要: This invention relates to a process for the preparation of a crystalline compound having an empirical formula LaCr.sub.x A.sub.1-x O.sub.4.yH.sub.2 O where A is a metal selected from the group consisting of Mg, Sr, Ca and Ba, x ranges from 0.99 to about 0.7 and y ranges from 0 to 0.15. The process comprises adding a solution of the appropriate metal salts to a solution of ammonium hydroxide thereby precipitating a hydroxide gel intermediate, which is dried and calcined in air to yield the resultant crystalline compound which has a huttonite structure. Additionally, this invention relates to a process for the preparation of a ceramic powder having the empirical formula LaCr.sub.x A.sub.1-x O.sub.3, where A is a metal selected from the group consisting of Mg, Sr, Ca and Ba, and x ranges from 0.99 to about 0.7. Finally, a ceramic composition having the empirical formula LaCr.sub.x A.sub.1-x O.sub.4.yH.sub.2 O having a huttonite structure is also disclosed.

    摘要翻译: 本发明涉及制备具有经验式LaCrxAl-xO4.yH2O的结晶化合物的方法,其中A是选自Mg,Sr,Ca和Ba的金属,x为0.99至约0.7,y为 范围从0到0.15。 该方法包括将合适的金属盐溶液加入到氢氧化铵溶液中,由此使氢氧化凝胶中间体沉淀,将其在空气中干燥和煅烧,得到所得到的具有钙钛矿结构的结晶化合物。 另外本发明涉及制备具有经验式LaCrxAl-xO3的陶瓷粉末的方法,其中A是选自Mg,Sr,Ca和Ba的金属,x在0.99至0.7的范围内 。 最后,还公开了具有钙钛矿结构的经验式LaCrxAl-xO4.yH2O的陶瓷组合物。