摘要:
A process for producing a boehmite shaped product comprises slurrying a mixture of a gibbsite powder and at least one powder selected from the group consisting of powders of pseudo-boehmite, amorphous aluminum hydroxide, alumina cement and .rho.-alumina, molding the slurry thereby obtained and subjecting the molded product to hydrothermal treatment.
摘要:
A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising .alpha.-tricalcium phosphate and zirconia, or hydroxyapatite and zirconia formed on the surface of the sintered body of zirconia.
摘要:
A ceramic implant comprising a sintered body of zirconia and a coating layer of a porous sintered body of a mixture comprising .alpha.-tricalcium phosphate and zirconia, or hydroxyapatite and zirconia formed on the surface of the sintered body of zirconia.
摘要:
A boehmite having an orthorhombic crystal form in which the ratio of the maximum length in the direction of the a-axis of the crystal to the distance between the opposing crystal faces perpendicular to the c-axis of said crystal is at least 10, said maximum length in the direction of the a-axis of the crystal is at least 2500 .ANG. and said distance between the opposing faces perpendicular to the c-axis of said crystal is 250-900 .ANG..
摘要:
A boehmite having a crystal form wherein the ratio of the maximum length in the direction of the a-axis to the distance between the opposing crystal faces perpendicular to the c-axis is at least 10.
摘要:
A process for producing a ceramic implant which comprises creating a powder mixture comprising zirconia and .alpha.-tricalcium phosphate or zirconia and hydroxyapatite, in a weight ratio of 0.05 to 20 on the surface of a molded unsintered product of partially stabilized zirconia, followed by sintering at 1200.degree. to 1550.degree. C. The partially stabilized zirconia may have a BET specific surface area of from 5 to 10 m.sup.2 /g and have been subjected to wet pulverization to increase the BET specific surface area from 1.05 to 2.0 times relative to the starting material.
摘要:
A calcium silicate shaped product comprises heat-resistant particles having a radiation energy absorptivity of at least 20% throughout the entire range of the wavelength of from about 2 to about 5.mu., as measured by a 0.1 wt. % KBr disc method.
摘要:
Nitrogen oxides in exhaust gases are catalytically reduced in the presence of oxygen and ammonia at 200.degree. to 600.degree. C. over a catalyst of at least one catalyst component selected from the group consisting of compounds of metals of Groups 1B, 5A, 6A, 7A and 8 of the periodic table, and lanthanides and tin which is supported on a specific carrier comprising a main component of calcium silicate.
摘要:
A piezoelectric ceramic composition for actuators, composed of lead, lanthanum, zirconium, titanium, magnesium, zinc, niobium, manganese, chromium and oxygen atoms, which contains manganese in an amount of at most 1.5% by weight as calculated as Mn.sub.2 O and chromium in an amount of at most 0.5% by weight as calculated as Cr.sub.2 O.sub.3, relative to a main component composition of the formula (I):Pb.sub.(1-x) La.sub.x [(1-z)(Zr.sub.y Ti.sub.(1-y))+z{Mg.sub.q Zn.sub.(1-q)).sub.1/3 Nb.sub.2/3 }].sub.(1-x/4) O.sub.3 (I)wherein 0
摘要:
A calcium silicate shaped product is prepared by forming an aqueous slurry of calcium silicate hydrate by reacting a calcareous source with a siliceous source in water as a dispersion under heating; molding said aqueous slurry to form a molded product having a bulk density of less than 0.6 g/cm.sub.3 ; curing said molded product, in a closed tank having a capacity of 1.5 to 30 times of the volume of said molded product at 140.degree. to 300.degree. C. by dry-heating without feeding steam, and drying the product.
摘要翻译:通过使石灰质源与水中的硅质源在加热下作为分散体反应,形成硅酸钙水合物的水性浆料来制备硅酸钙形状的产物; 模塑所述含水浆料以形成堆积密度小于0.6g / cm 3的模制产品; 在密封容器中将所述模制产品固化,在密封容器中,其容量为所述模制产品的体积的1.5至30倍,在140至300℃下,通过干加热而不进料蒸汽,并干燥产物。