Ceramic composition, composite material, composite material production method, porous body, oxygen separator, and chemical reactor

• Main Authors: SAKON, TADASHI, NAGAI, TORU, ITO, WATARU, DOHNOMAE, HITOSHI, YAMADA, NORIKO
• Format: Patent
• Language: English; French; German
• Published: 02.05.2001
• Edition: 7
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; LIME, MAGNESIA; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; REFRACTORIES; SEPARATION; SLAG; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF NATURAL STONE

A ceramic composite is a mixed conducting oxide that has a perovskite type crystal structure of äLn1-aAaüäBxB'yB''züO(3- delta ) where a, x, y, and z are within the range of 0.8 ≤ a ≤ 1, 0 < x, 0 < y ≤ 0.5, 0 ≤ z ≤ 0.2, 0.98 ≤ x + y + z ≤ 1.02, and delta denotes a value that is determined so as to meet a charge neutralization condition; Ln denotes a combination of one or more kinds of elements selected from Y or lanthanoide elements; A denotes a combination of one or more kinds of elements selected out of Ba, Sr, and Ca; B denotes a combination of one or more kinds of elements selected out of Co, Fe, Cr, and Ga, the combination always containing Fe or Co, wherein a summation of molar numbers of Cr and Ga is 0 % to 20 % of a total molar number 'x' of element B; B' denotes a combination of one or more kinds of elements selected out of Nb, Ta, Ti, and Zr, the combination always containing Nb or Ta, and where a summation of molar numbers is 0 % to 20 % of a total molar number 'y' of element B'; and B'' denotes a combination of one or more kinds of elements selected out of Cu, Ni, Zn, Li, and Mg. This ceramic composite has its excellent properties as a dense film as well as a porous support body. In addition, another type of porous support body that the present invention provides is composed of a mixed conducting oxide and a ceramic composite, wherein, when the compositional formula is expressed as AFexO(3- delta ), the composite formula is constituted, A is selected out of Ba, Sr, and Ca, and is within the range of 0.98 ≤ x ≤ 1.02, and delta denotes a value determined so as to meet the charge neutralization conditions.