87results about How to "Microporous reduction" patented technology

An aluminum silicon die cast alloy having a very low iron content and relatively high strontium content that prevents soldering to dies into die casting process. The alloys of the present invention also have a modified eutectic silicon and modified iron morphology, when iron is present, resulting in low microporosity and high impact properties. The alloy comprises 6-22% by weight silicon, 0.05 to 0.20% by weight strontium and the balance aluminum. Preferably, the alloy of the present invention contains in weight percent: 6-20% silicon, 0.05-0.10% strontium, 0.40% maximum iron and most preferably 0.20% maximum iron, 4.5% maximum copper, 0.50% maximum manganese, 0.60% maximum magnesium, 3.0% maximum zinc, balance aluminum. On cooling from the solution temperature, the strontium serves to modify the eutectic silicon structure as well as create an iron phase morphology change if iron is present, facilitating feeding through the aluminum interdendritic matrix. This, in turn, creates a finished die cast product with extremely low levels of microporosity defects. The strontium content also appears to create a non-wetting monolayer of strontium atoms on the surface of a molten casting, preventing die soldering, even at very low iron contents. The alloy may be used to cast any type of object and is particularly suited for casting outboard marine propellers, driveshaft housings, gear case housings, Gimbel rings and engine blocks.

The invention relates to a waterproof and air-permeable shoe, which comprises a waterproof and air-permeable upper. The upper is made of an elastic waterproof material. Micropores which run through the upper surface and the lower surface of the upper are distributed on the surface of the upper. The micropores are air-permeable and watertight. At the same time, the invention additionally disclosesthe production method of the waterproof and air-permeable shoe. The method comprises the following steps of: 1) molding the semi-finished upper of the waterproof and air-permeable shoe by using the elastic waterproof material, wherein the semi-finished upper has the shape and the size of the upper; 2) cooling the semi-finished upper; 3) using a fine needle to pierce the surface of the cooled semi-finished upper to form the micropores of the upper, so as to form the upper of the waterproof and air-permeable shoe; and 4) hermetically connecting the upper and a sole to form the waterproof and air-permeable shoe. The production method of the waterproof and air-permeable shoe is simple, the cost is low and the waterproof and air-permeable performance is good.