Abstract:
The invention offers a magnesium alloy sheet material having excellent plastic processibility and rigidity and a magnesium alloy formed body having excellent rigidity. The sheet material has magnesium alloy that forms the matrix containing hard particles. The region from the surface of the sheet material to a position away from the surface by 40% of the thickness of the sheet material is defined as the surface region, and the remaining region as the center region. Hard particles existing in the center region have a maximum diameter of more than 20 μm and less than 50 μm, and hard particles existing in the surface region have a maximum diameter of 20 μm or less. Because the hard particles existing at the surface side are fine particles, they are less likely to become the starting point of cracking or another defect at the time of plastic processing. Because the hard particles existing in the center region are coarse, they can increase the rigidity of the sheet material.
Abstract:
The present invention relates to a gas-absorbing substance that contains at least Li and a solid material having a hardness of 5 or more, and absorbs at least nitrogen or oxygen at 25° C. under normal pressure, and a gas-absorbing alloy that contains at least two kinds of metals that are not allowed to mutually form an intermetallic compound, with a mixing enthalpy of the two kinds of metals being greater than 0 and at least one portion of the two kinds of metals being atomically mixed, and also concerns a gas-absorbing material that contains the gas-absorbing substance and the gas-absorbing alloy
Abstract:
A member for a semiconductor device of low price, capable of forming a high quality plating layer on a surface, having heat conductivity at high temperature (100° C.) of more than or equal to 180 W/m·K and toughness that will not cause breaking due to screwing, and will not cause solder breaking due to heat stress when it is bonded to other member with solder, and a production method thereof are provided. A member for a semiconductor device (1) having a coefficient of thermal expansion ranging from 6.5×10−6/K to 15×10−6/K inclusive, and heat conductivity at 100° C. of more than or equal to 180 W/m·K, has: a base material (11) formed of an aluminum-silicon carbide composite material starting from powder material in which particulate silicon carbide is dispersed in aluminum or aluminum alloy, and the content of the silicon carbide is from 30% by mass to 85% by mass inclusive; and a superficial layer (12) containing aluminum or aluminum alloy starting from a melt material bonded on top and bottom faces of the base material (11).
Abstract:
Metal-matrix composites with combinations of physical and mechanical properties desirable for specific applications can be obtained by varying and controlling selected parameters in the material formation processes, particularly by increasing the microstructural homogeneity of the composite, while maintaining a constant mixture ratio or volume fraction. In one embodiment of the invention, a CuSiC composite having increased thermal conductivity is obtained by closely controlling the size of the SiC particles. In another embodiment of the invention, AlSiC composites which exhibit increased ultimate tensile and yield strengths are made by closely controlling the size of SiC and Al particles.
Abstract:
The present invention is a process for producing a radiator member for electronic appliances, and is characterized in that, in a process for producing a radiator member for electronic appliances, the radiator member comprising a composite material in which SiC particles are dispersed in a matrix metal whose major component is Al, it comprises a filling step of filling an SiC powder into a mold, a pre-heating step of pre-heating the mold after the filling step to a pre-heating temperature which falls in a range of from a melting point or more of said matrix metal to less than a reaction initiation temperature at which a molten metal of the matrix metal and SiC particles in the SiC powder start to react, and a pouring step of pouring the molten matrix metal whose molten-metal temperature falls in a range of from the melting point or more of the matrix metal to less than the reaction initiation temperature, into the mold after the pre-heating step, and impregnating the SiC powder with the molten metal by pressurizing.When the molten-metal temperature and the pre-heating temperature are from the melting point or more of the matrix metal to less than the reaction initiator temperature, it is possible to inhibit the generation of low thermal conductive materials while securing the impregnation of the molten metal into the SiC powder.
Abstract:
A three-phase nanocomposite that comprises about 0.5 to 10 vol % nano-scale aluminum oxide particles and about 1 to 45% high modulus ceramic particles and an aluminum alloy matrix. The nano phase is to enhance nanocomposite strength and the modulus phase is to enhance the specific modulus of the resulting nanocomposite.
Abstract:
To provide a substrate material made of an aluminum/silicon carbide composite alloy which has a thermal conductivity of 100 W/m×K or higher and a thermal expansion coefficient of 20×10−6/° C. or lower and is lightweight and compositionally homogeneous. A substrate material made of an aluminum/silicon carbide composite ally which comprises Al—SiC alloy composition parts and non alloy composition part and dispersed therein from 10 to 70% by weight silicon carbide particles, and in which the fluctuations of silicon carbide concentration in the Al—SiC alloy composition parts therein are within 1% by weight. The substrate material is produced by sintering a compact of an aluminum/silicon carbide starting powder at a temperature not lower than 600° C. in a non-oxidizing atmosphere.
Abstract:
Although MIM (metal injection molding) has received widespread application, aluminum has not been widely used for MIM in the prior art because of the tough oxide layer that grows on aluminum particles, thus preventing metal—metal bonding between the particles. The present invention solves this problem by adding a small amount of material that forms a eutectic mixture with aluminum oxide, and therefore aids sintering, to reduce the oxide, thereby allowing intimate contact between aluminum surfaces. The process includes the ability to mold and then sinter the feedstock into the form of compacted items of intricate shapes, small sizes (if needed), and densities of about 95% of bulk.
Abstract:
The present invention is generally directed towards a carrier of a motor vehicle. The carrier is formed of a first portion and the second portion. The first portion is made of aluminum having ceramic particles reinforcing the aluminum matrix. The second portion is made of unreinforced aluminum metal or metal alloy. Preferably the second portion is present in form of discrete pockets in the first portion and is adapted to be machined or welded.
Abstract:
A method for making aerospace face seal rotors reinforced by rhenium metal, alloy, or composite in combination with silicon carbide or other ceramic. The resulting rotor also is disclosed. Ceramic grains, preferably silicon carbide (SiC), are mixed with powdered metallic (PM) binder that may be based on a refractory metal, preferably rhenium. The mixture is applied to a rotor substrate. The combined ceramic-metal powder mixture is heated to sintering temperature under pressure to enable fusion of the ceramic in the resulting metal-based substrate. A load may then be applied under an elevated temperature. The resulting coated rotor can exhibit high hot hardness, increased durability and/or high hot wear resistance, as well as high thermal conductivity.