A composite for a porous transport layer may include a particulate substrate including at least one selected from a group consisting of an oxide of a first metal and a second metal, and nanoparticles of a third metal formed on a surface of the particulate substrate, a sintered body thereof, and a method for preparing the same.

A method for manufacturing a porous metal body according to the present invention includes: a surface oxidizing step of heating a titanium-containing powder in an atmosphere containing oxygen at a temperature of 250° C. or more for 30 minutes or more to provide a surface-oxidized powder; and a sintering step of depositing the surface-oxidized powder in a dry process, and sintering the surface-oxidized powder by heating it in a reduced pressure atmosphere or an inert atmosphere at a temperature of 950° C. or more.

The present application can provide a composite material which comprises a metal foam, a polymer component and an electrically conductive filler, has other excellent physical properties such as impact resistance, processability and insulation properties while having excellent thermal conductivity, and is also capable of controlling electrical conductivity characteristics.

The present application provides a composite material and a method for preparing the same. The present application can provide a composite material which comprises a metal foam and a polymer component and if necessary, further comprises a thermally conductive filler, and has other excellent physical properties such as impact resistance, processability and insulation properties while having excellent thermal conductivity.

The present application provides a composite material and a method for preparing the same. The present application can provide a composite material which comprises a metal foam and a polymer component and if necessary, further comprises a thermally conductive filler, and has other excellent physical properties such as impact resistance, processability and insulation properties while having excellent thermal conductivity.

The present invention addresses the problem of providing a sintered alloy valve guide capable of inhibiting valve adhesion even in a high-temperature environment. The problem can be solved by a sintered alloy valve guide impregnated with a lubricating oil including pores that are sealed on the valve guide outer circumferential surface. More particularly, the problem is solved by the sealing step of performing a sealing treatment of pores on the outer circumferential surface of a sintered body impregnated with a lubricating oil.

The present invention provides an automated device for degassing and/or foaming of metals and their alloys and process thereof. Said automated device for degassing and/or foaming of molten metals and their alloys and a process facilitates in controlled degassing and/or foaming of molten metals and thereby increases tensile strength, impact strength, hardness, malleability, corrosion resistance, conductivity of metals and their alloys and further eliminates the use of harmful chemicals and injectable gases in degasification of metal and alloys. Present automated device mainly comprises of plurality of sonic generator 1, controller 2, first assembly 3, second assembly 4, third assembly 5, fourth assembly 6. Said process comprises of steps including; 1. Selecting the mode of operation and setting parameters; 2. Activating said assemblies and facilitating Formation of ultrasonic cavitation in metal and their alloys; 3. Degassing of the molten metal and their alloys due to formation of micro bubbles.

The present invention provides an automated device for degassing and/or foaming of metals and their alloys and process thereof. Said automated device for degassing and/or foaming of molten metals and their alloys and a process facilitates in controlled degassing and/or foaming of molten metals and thereby increases tensile strength, impact strength, hardness, malleability, corrosion resistance, conductivity of metals and their alloys and further eliminates the use of harmful chemicals and injectable gases in degasification of metal and alloys. Present automated device mainly comprises of plurality of sonic generator 1, controller 2, first assembly 3, second assembly 4, third assembly 5, fourth assembly 6. Said process comprises of steps including; 1. Selecting the mode of operation and setting parameters; 2. Activating said assemblies and facilitating Formation of ultrasonic cavitation in metal and their alloys; 3. Degassing of the molten metal and their alloys due to formation of micro bubbles.

The present application provides a method for manufacturing a metal foam. The present application can provide a method for manufacturing a metal foam, which is capable of forming a metal foam comprising uniformly formed pores and having excellent mechanical properties as well as the desired porosity, and a metal foam having the above characteristics. In addition, the present application can provide a method capable of forming a metal foam in which the above-mentioned physical properties are ensured, while being in the form of a thin film or sheet, within a fast process time, and such a metal foam.

A metal porous body having a three-dimensional network structure, includes: a framework forming the three-dimensional network structure; and a coating layer having fine pores and coating the framework, the three-dimensional network structure including a rib and a node connecting a plurality of ribs, the framework including an alkali-resistant first metal, the fine pores having an average fine pore diameter of 10 nm or more and 1 μm or less, the coating layer including an alkali-resistant second metal and optionally including an alkali-soluble metal, the alkali-soluble metal being contained at a proportion of 0% by mass or more and 30% by mass or less with reference to a total mass of the framework and the coating layer.