Abstract: A transmission shaft set includes a shaft for use in a motor for power output and an axle bush adapted to support the shaft, the shaft and the axle bush being respectively made of material of high toughness and material of high harness such that the hardness difference between the shaft and the axle bush is about Hv100˜Hv400, and the hardness of the axle bush is higher than the shaft.

Abstract: A method of manufacturing a high-density titanium alloy article is disclosed. The method comprises a mixing and granulating step, a high-pressure molding step, and a high-temperature sintering step. Moreover, by means of selecting proper size of titanium raw powder and granulating the titanium raw powder and other metallic powder into titanium-based grains, a titanium alloy article having a high density is obtainable.

Abstract: The present invention discloses a method of manufacturing a combination heat sink having a best heat transfer efficiency and a combination heat sink made thereby. The present method comprises steps (a) to (d). In step (a), the plurality of radiating fins are piled up by sparing the radiating fins apart from each other in a substantially parallel manner with the bottom edges thereof being oriented in a same direction. In step (b), a recess is formed on the top surface of the common surface. In step (c), a heat-conductive brazing alloy is applied to the recess of the common surface. In step (d), the plurality of radiating fins are joined with the common base by seating the bottom edges of the fins onto the recess of the common base and heating the brazing alloy.

Abstract: A fusion welding method for binding the surfaces of two metals including the steps of (a) coating a layer of a powdery media capable of forming eutectics with both the two metals for lowering the melting points of the two metals, onto at least one of the binding surfaces of the two metal to be bound; and (b) sintering, in a vacuum furnace, the two metals with said powdery media being coated on their binding surfaces as produced in step (a) until the two metals are fused together by eutectic welding, and the sintering temperature being controlled at a temperature higher than the eutectic points of the two metals and the powdery medium, but lower than the melting points of the two metals.