Abstract: With respect to an oxide powder having a characteristic that a suspension suspending the oxide powder in pure water exhibits a pH value of 7 or less, a noble metal is loaded on the oxide powder by using a noble metal salt solution exhibiting a pH value lower than the pH value of the suspension in order to inhibit the granular growth of loaded noble metal particles at high temperatures. It is believed that the affinity enlarges between noble metal particles, generated by the decomposition of the noble metal salt, and the oxide powder because no coarse noble metal particles are generated by neutralizing the noble metal salt so that the binding force enlarges between the oxide powder and the noble metal salt.

Abstract: A catalyst for purifying an exhaust gas includes a composite oxide including gold (Au) and having crystalline unit cells in every one of which an Au ion is disposed. Since the Au exists in a state of an ion, the catalyst exhibits a good catalytic activity. Since the Au is present in such a manner that it is surrounded by the other elements, it is inhibited from moving. As a result, the catalyst is improved in terms of the heat resistance.

Abstract: A high-strength aluminum alloy having good porthole extrudability is provided. It has a Vickers hardness Hv of not less than 40 as measured in a homogenized state created by heat treatment before extrusion and a Vickers hardness Hv of not less than 20 imparted by plastic working after the heat treatment.

Abstract: The present invention provides a superplastic aluminum alloy in which fine particles not substantially dispersion hardening are dispersed in a sufficient amount to effect grain boundary pinning to suppress crystal grain growth during hot working thereby ensuring manifestation of superplasticity over wide ranges of working temperature and strain rate.

Abstract: The present invention provides a superplastic aluminum alloy in which fine particles not substantially dispersion hardening are dispersed in a sufficient amount to effect grain boundary pinning to suppress crystal grain growth during hot working thereby ensuring manifestation of superplasticity over wide ranges of working temperature and strain rate.

Abstract: The present invention relates to an alloy catalyst for purifying an exhaust gas, and particularly provides an alloy catalyst excellent in nitrogen oxide purification characteristics in the lean region by improving the catalytic activity by coating first catalytic metal particles with a second metal coagulated phase, and a process for producing the same, the alloy catalyst for purifying an exhaust gas having a structure in which metal coagulated phases being applied to and supported by a metal oxide, and comprising first catalytic metal particles having an average particle size of up to 30 nm, and a second metal coagulated phase containing at least one metal, differing from the catalytic metal particles, and applying to the first catalytic metal particles at a coating ratio of at least 45%, and the process for producing an alloy catalyst for purifying an exhaust gas, comprising the steps of allowing first catalytic metal particles having an average particle size of up to 30 nm to adhere onto a metal oxide, and

Abstract: The present invention relates to a process for producing a superplastic aluminum alloy capable of being used for plastic working such as extrusion, forging and rolling. An object of the present invention is to provide an ingot-made high speed superplastic aluminum alloy in which superplasticity is developed at a strain rate higher than that of conventional static recrystallization type superplastic aluminum alloys, and a process for producing the same. The superplastic aluminum alloy of the invention has structure which is obtained by adding to a basic alloy containing from at least 4.0 to 15% by weight of Mg and from 0.1 to 1.0% by weight of one or more elements selected from the group consisting of Mm, Zr, V, W, Ti, Ni, Nb, Ca, Co, Mo and Ta, and further selective elements of Sc, Cu. Li, Sn, In and Cd, which contains from 0.1 to 4.0% by volume fraction of spheroidal precipitates of intermetallic compounds having a particle size from 10 to 200 nm, and which has a mean grain size from 0.1 to 10 .mu.m.

Abstract: To provide a hot working method which can reduce working resistance during the early stage of hot plastic working, particularly extrusion and forging using a die.A hot plastic working method characterized by comprising the step of plastically working, using a die, a material having a structure of not more than 50 .mu.m in average grain diameter with dispersed spherical grains ranging in size from 10 to 200 nm, the working material having a recess formed on a surface thereof in its site facing a closed space formed by abutting the working material against the die surface at the time of plastic working.

Abstract: The present invention relates to a process for producing a superplastic aluminum alloy capable of being used for plastic working such as extrusion, forging and rolling. An object of the present invention is to provide an ingot-made high speed superplastic aluminum alloy in which superplasticity is developed at a strain rate higher than that of conventional static recrystallization type superplastic aluminum alloys, and a process for producing the same. The superplastic aluminum alloy of the invention has structure which is obtained by adding to a basic alloy containing from at least 4.0 to 15% by weight of Mg and from 0.1 to 1.0% by weight of one or more elements selected from the group consisting of Mm, Zr, V, W, Ti, Ni, Nb, Ca, Co, Mo and Ta, and further selective elements of Sc, Cu, Li, Sn, In and Cd, which contains from 0.1 to 4.0% by volume fraction of spheroidal precipitates of intermetallic compounds having a particle size from 10 to 200 nm, and which has a mean grain size from 0.1 to 10 .mu.m.