A spherical alumina powder having a maximum particle diameter showing a maximum peak in the range of 35 to 70 μm, a frequency of 5 to 15%, and an accumulated value of frequencies respectively at 20 particle diameter points, obtained by dividing a particle diameter range of 1 to 20 μm equally into 19 sections, of 3 to 17% by volume, the powder providing a ratio (V.sub.Y/V.sub.X) of a viscosity V.sub.Y of a resin composition Y to a viscosity V.sub.X of a resin composition X of 0.85 or more, composition X containing the powder and a vinyl group-containing polymethylsiloxane, the powder being contained in an amount of 88.1% by mass, the resin composition Y being the same as X except for containing the same powder as in composition X in an amount of 79.3% by mass and containing a powder for testing in an amount of 8.8% by mass.

The present invention relates to: an antibacterial composite material with a bactericidal effect, having a shape in which aluminum hydroxide is coupled, in an island form, to the surface of a copper compound; and a preparation method therefor, and since the antibacterial composite material rapidly exhibits an immediate bactericidal effect against bacteria or viruses for a short time of five minutes or less and the bactericidal effect is maintained for a long time, the antibacterial composite material is usable in various fields requiring an antibacterial effect, and thus an effective antibacterial and antiviral function can be provided.

A particulate composition contains α-alumina particles, and water-absorbing polymer particles. The content of the water-absorbing polymer particles is 2 parts by mass or more and 60 parts by mass or less with respect to 100 parts by mass of the α-alumina particles, and the content of the α-alumina particles in the particulate composition is 50% by mass or more.

A substrate 10 comprises: a first layer L1 containing crystalline aluminum nitride; a second layer L2 containing crystalline α-alumina; and an intermediate layer Lm sandwiched between the first layer L1 and the second layer L2 and containing aluminum, nitrogen, and oxygen, and the content of nitrogen in the intermediate layer Lm decreases in a direction Z from the first layer L1 toward the second layer L2, and the content of oxygen in the intermediate layer Lm increases in the direction Z from the first layer L1 toward the second layer L2.

Disclosed herein is a process for coating a component, comprising applying a bond coat on a substrate of a component; applying a thermal barrier material to the bond coat; and applying a coating containing polynuclear aluminum oxide/hydroxide clusters, to the thermal barrier material. Disclosed herein too is a gas turbine engine component, comprising a superalloy substrate; a bond coat on the substrate; a thermal barrier material on the bond coat; and a coating containing polynuclear aluminum oxide/hydroxide clusters on the thermal barrier material.

Disclosed herein is a process for coating a component, comprising applying a bond coat on a substrate of a component; applying a thermal barrier material to the bond coat; and applying a coating containing polynuclear aluminum oxide/hydroxide clusters, to the thermal barrier material. Disclosed herein too is a gas turbine engine component, comprising a superalloy substrate; a bond coat on the substrate; a thermal barrier material on the bond coat; and a coating containing polynuclear aluminum oxide/hydroxide clusters on the thermal barrier material.

Provided are nanophosphor-attached inorganic particles that can suppress the degradation of the nanophosphor when sealed in glass, and a wavelength conversion member using the nanophosphor-attached inorganic particles. The nanophosphor-attached inorganic particle 10 include: inorganic particles 1 having an average particle diameter of 1 μm or more; and a nanophosphor 2 attached to surfaces of the inorganic particles 1.

Provided are nanophosphor-attached inorganic particles that can suppress the degradation of the nanophosphor when sealed in glass, and a wavelength conversion member using the nanophosphor-attached inorganic particles. The nanophosphor-attached inorganic particle 10 include: inorganic particles 1 having an average particle diameter of 1 μm or more; and a nanophosphor 2 attached to surfaces of the inorganic particles 1.

A method is disclosed for treating an anodized metal surface. According to the method, polynuclear clusters comprising aluminum oxide hydroxide are applied to the anodized metal surface.

A method is disclosed for treating an anodized metal surface. According to the method, polynuclear clusters comprising aluminum oxide hydroxide are applied to the anodized metal surface.