Provided is a hydrophilization treatment agent for an aluminum-containing metal material, for forming a film that can provide excellent hydrophilicity and hydrophilic sustainability, as well as odor property to an aluminum-containing metal material for use in a heat exchanger or the like.

The hydrophilization treatment agent for an aluminum-containing metal material contains: organic-inorganic composite particles obtained by combining a water-soluble resin (A) having a hydroxyl group, a poorly water-soluble inorganic oxide (B), an organoalkoxysilane (C), and a surfactant (D) at specific ratios; and water, and the organic-inorganic composite particles are 40 to 100 mass % based on total solid content by mass.

Provided is a hydrophilization treatment agent for an aluminum-containing metal material, for forming a film that can provide excellent hydrophilicity and hydrophilic sustainability, as well as odor property to an aluminum-containing metal material for use in a heat exchanger or the like.

The hydrophilization treatment agent for an aluminum-containing metal material contains: organic-inorganic composite particles obtained by combining a water-soluble resin (A) having a hydroxyl group, a poorly water-soluble inorganic oxide (B), an organoalkoxysilane (C), and a surfactant (D) at specific ratios; and water, and the organic-inorganic composite particles are 40 to 100 mass % based on total solid content by mass.

Silica particles includes a nitrogen-containing compound. The ratio of the integral C of a signal observed at a chemical shift of −50 ppm or more and −75 ppm or less in a .sup.29Si solid-state nuclei magnetic resonance (NMR) spectrum of the silica particles, the .sup.29Si solid-state NMR spectrum being obtained by cross polarization/magic angle spinning (CP/MAS), to the integral D of a signal observed at a chemical shift of −90 ppm or more and −120 ppm or less in the .sup.29Si solid-state NMR spectrum, that is, C/D, is 0.10 or more and 0.75 or less. The amount X of the nitrogen-containing compound extracted from the silica particles with a mixed solution of ammonia and methanol is 0.1% by mass or more. The amount X of the nitrogen-containing compound extracted and the amount Y of the nitrogen-containing compound extracted from the silica particles with water satisfy Y/X<0.3.

Silica particles includes a nitrogen-containing compound. The ratio of the integral C of a signal observed at a chemical shift of −50 ppm or more and −75 ppm or less in a .sup.29Si solid-state nuclei magnetic resonance (NMR) spectrum of the silica particles, the .sup.29Si solid-state NMR spectrum being obtained by cross polarization/magic angle spinning (CP/MAS), to the integral D of a signal observed at a chemical shift of −90 ppm or more and −120 ppm or less in the .sup.29Si solid-state NMR spectrum, that is, C/D, is 0.10 or more and 0.75 or less. The amount X of the nitrogen-containing compound extracted from the silica particles with a mixed solution of ammonia and methanol is 0.1% by mass or more. The amount X of the nitrogen-containing compound extracted and the amount Y of the nitrogen-containing compound extracted from the silica particles with water satisfy Y/X<0.3.

Molybdenum-silicon carbide composite powder and a fabrication method thereof are provided. The molybdenum-silicon carbide composite powder includes a micro-scale silicon carbide powder and a plurality of submicron-scale molybdenum particles bonding on the surface of the silicon carbide powder.

Molybdenum-silicon carbide composite powder and a fabrication method thereof are provided. The molybdenum-silicon carbide composite powder includes a micro-scale silicon carbide powder and a plurality of submicron-scale molybdenum particles bonding on the surface of the silicon carbide powder.

The present invention provides a means that can improve density and mechanical strength in a sintered body of a composition containing a sintering aid and a silicon carbide particle, and a molded article containing the sintered body. The present invention relates to a coated silicon carbide particle powder containing a silicon carbide particle, and a coating layer coating the silicon carbide particle, in which the coating layer contains an aluminum element, and the mass of the aluminum element per unit surface area of the silicon carbide particle is 0.5 mg/m.sup.2 or more.

The present invention provides a means that can improve density and mechanical strength in a sintered body of a composition containing a sintering aid and a silicon carbide particle, and a molded article containing the sintered body. The present invention relates to a coated silicon carbide particle powder containing a silicon carbide particle, and a coating layer coating the silicon carbide particle, in which the coating layer contains an aluminum element, and the mass of the aluminum element per unit surface area of the silicon carbide particle is 0.5 mg/m.sup.2 or more.

Silicon particles with a reduced and/or delayed propensity to generate hydrogen gas by reaction with water in aqueous inks for preparing lithium ion battery anodes are prepared by milling silicon, preferably in an oxidative atmosphere, followed by heat treating at an elevated temperature in vacuum or an inert atmosphere.

Silicon particles with a reduced and/or delayed propensity to generate hydrogen gas by reaction with water in aqueous inks for preparing lithium ion battery anodes are prepared by milling silicon, preferably in an oxidative atmosphere, followed by heat treating at an elevated temperature in vacuum or an inert atmosphere.