摘要:
This disclosure relates to a method of densifying a lanthanide chromite ceramic or a mixture containing a lanthanide chromite ceramic. The method comprises mixing one or more lanthanide chromite ceramics with one or more sintering aids, and sintering the mixture. The one or more lanthanide chromite ceramics are represented by the formula (Ln1-xAEx)zCr1-yByO3-δ, wherein Ln is a lanthanide element or yttrium, AE is one or more alkaline earth elements, B is one or more transition metals, x is a value less than 1, y is a value less than or equal to 0.5, and z is a value from 0.8 to 1.2. The sintering aids comprise one or more spinel oxides. The one or more spinel oxides are represented by the formula AB2O4 or A2BO4 wherein A and B are cationic materials having an affinity for B-site occupancy in a lanthanide chromite ceramic structure, e.g., ZnMn2O4, MgMn2O4, MnMn2O4 and CoMn2O4. This disclosure also relates in part to products, e.g., dense ceramic structures produced by the above method.
摘要翻译:本公开涉及致密化镧系铬铁矿陶瓷或含有镧系铬铁矿陶瓷的混合物的方法。 该方法包括将一种或多种镧系亚铬酸盐陶瓷与一种或多种烧结助剂混合,并烧结该混合物。 一种或多种镧系亚铬酸盐陶瓷由式(Ln1-xAEx)zCr1-yByO3-δ表示,其中Ln是镧系元素或钇,AE是一种或多种碱土金属元素,B是一种或多种过渡金属,x 是小于1的值,y是小于或等于0.5的值,z是0.8至1.2的值。 烧结助剂包括一种或多种尖晶石氧化物。 一种或多种尖晶石氧化物由式AB2O4或A2BO4表示,其中A和B是对镧系铬铁矿陶瓷结构中的B位占据的亲和性的阳离子材料,例如ZnMn 2 O 4,MgMn 2 O 4,MnMn 2 O 4和CoMn 2 O 4。 本公开还部分地涉及产品,例如通过上述方法制备的致密陶瓷结构。
摘要:
A method of making ceramic electrode materials comprising intimate mixtures of two or more components, including at least one nanoscale ionically conducting ceramic electrolyte material (e.g., yttrium-stabilized zirconia, gadolinium-doped ceria, samarium-doped ceria, etc.) and at least one powder of an electrode material, which may be an electrically conducting ceramic electrode material (e.g., lanthanum strontium manganite, praseodymium strontium manganese iron oxide, lanthanum strontium ferrite, lanthanum strontium cobalt ferrite, etc.) or a precursor of a metallic electrode material (e.g., nickel oxide, copper oxide, etc.). The invention also includes anode and cathode coatings and substrates for solid oxide fuel cells prepared by this method.
摘要:
Aqueous coating slurries useful in depositing a dense coating of a ceramic electrolyte material (e.g., yttrium-stabilized zirconia) onto a porous substrate of a ceramic electrode material (e.g., lanthanum strontium manganite or nickel/zirconia) and processes for preparing an aqueous suspension of a ceramic electrolyte material and an aqueous spray coating slurry including a ceramic electrolyte material. The invention also includes processes for depositing an aqueous spray coating slurry including a ceramic electrolyte material onto pre-sintered, partially sintered, and unsintered ceramic substrates and products made by this process.
摘要:
Self-supporting thin film membranes of ceramic materials and related electrochemical cells and cell stacks. The membrane structure is divided into a plurality of self-supporting thin membrane regions by a network of thicker integrated support ribs. The membrane structure may be prepared by laminating a thin electrolyte layer with a thicker ceramic layer that forms a network of support ribs.
摘要:
Ceramic membranes with integral seals and support, and related electrochemical cells and cell stacks. The membrane comprises a thin electrolyte layer supported on a porous electrode layer which in turn is supported on a thick ceramic support layer, preferably a ceramic electrolyte support. The support layer is divided into a plurality of self-supporting thin membrane regions by a network of thicker integrated support ribs. The thin electrolyte layer and thick ceramic support layer preferably define a sealing perimeter surrounding the porous electrode layer.
摘要:
Electrode materials systems for planar solid oxide fuel cells with high electrochemical performance including anode materials that provide exceptional long-term durability when used in reducing gases and cathode materials that provide exceptional long-term durability when used in oxygen-containing gases. The cathode materials comprise zinc-doped lanthanum strontium ferrite (LSZF) or an alternative ferrite, cobaltite or nickelate ceramic electrode material. The cathode material also may comprise a mixed-conducting ceria-based electrolyte material, a palladium dopant, or a combination of these. The cathode may have a bi-layer structure. A ceramic-based interfacial layer may be provided at the electrolyte/cathode interface. The multilayer cathode system and its palladium doped cathode material exhibit a high degree of tolerance to chromium contamination during operation with metallic interconnect materials.
摘要:
Electrode materials systems for planar solid oxide fuel cells with high electrochemical performance including anode materials that provide exceptional long-term durability when used in reducing gases and cathode materials that provide exceptional long-term durability when used in oxygen-containing gases. The anode materials may comprise a cermet in which the metal component is a cobalt-nickel alloy. These anode materials provide exceptional long-term durability when used in reducing gases, e.g., in SOFCs with sulfur contaminated fuels. The cermet also may comprise a mixed-conducting ceria-based electrolyte material. The anode may have a bi-layer structure. A cerium oxide-based interfacial layer with mixed electronic and ionic conduction may be provided at the electrolyte/anode interface.
摘要:
A sulfur tolerant anode current collector material includes a mesh or foam that includes a cermet. The cermet includes a metallic component and a ceramic component. The metallic component includes nickel, an alloy including nickel and cobalt, or a mixture including a nickel compound and a cobalt compound. The ceramic component includes a mixed conducting electrolyte material.
摘要:
The invention relates to perovskite oxide electrode materials in which one or more of the elements Mg, Ni, Cu, and Zn are present as minority components that enhance electrochemical performance, as well as electrode products with these compositions and methods of making the electrode materials. Such electrodes are useful in electrochemical system applications such as solid oxide fuel cells, ceramic oxygen generation systems, gas sensors, ceramic membrane reactors, and ceramic electrochemical gas separation systems.