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 piezoelectric ceramic composition for actuators, which consists essentially of a composite of perovskite compounds represented by the formulaPb.sub.(1-x) La.sub.x [z{(Zn.sub..alpha. Mg.sub.(1-.alpha.))1/3Nb.sub.2/3 }+(1-z){Zr.sub.y Ti.sub.(1-y) }].sub.(1-x/4) O.sub.3wherein 0.03.ltoreq.x.ltoreq.0.07, 0.50.ltoreq.y.ltoreq.0.65, o
摘要:
The present invention relates to a piezoelectric ceramic composition for an actuator which is a ceramic composition comprising a main component represented by the formula: Pb.sub.(1-x) La.sub.x [Zr.sub.y Ti.sub.(1-y) ].sub.(1-x/4) O.sub.3 and, as a sub component, antinomy in an amount of more than 0.05% by weight and less than 3.0% by weight in terms of anitmony pentoxide relative to the main component. The piezoelectric ceramic composition of the present invention has a high electromechanical coupling factor, a high piezoelectric strain constant and a high Curie point, and is particularly excellent as a material for a piezoelectric actuator.
摘要:
A piezoelectric actuator comprising a longitudinal effect-type laminated piezoelectric element composed of piezoelectric ceramic sheets laminated in their thickness direction, and a supporting member fixed to one side in the longitudinal direction of the element and being bending and capable of constraining expansion of the element.
摘要:
A piezoelectric element of laminate type comprising a plurality of films or thin sheets of piezoelectric material of the same size, each having an internal electrode formed on its entire surface, said films or sheets being laminated so that the end face of each internal electrode is exposed at the side of the laminate, wherein an insulating layer is formed by a photosensitive composition to electrically connect every second internal electrode.
摘要:
A piezoelectric actuator comprising a longitudinal effect-type laminated piezoelectric element composed of piezoelectric ceramic sheets laminated in their thickness direction, and a supporting member fixed to one side in the longitudinal direction of the element and being bending and capable of constraining expansion of the element.
摘要:
A process for preparing a slender or thin ceramic green body, which comprises discharging a raw material slurry comprising a ceramic powder raw material, a binder and a solvent from a discharge outlet in a slender or thin shape, and then contacting it with a solidifying liquid composed of a liquid in which the solvent is soluble and the ceramic powder raw material and the binder are insoluble or hardly soluble so that the solvent in the slurry is dissolved and removed to form the green body.
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:
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:
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.