Patent ID: 8734598
Filing Date: 2014-05-27
Classification: C23C

Abstract:
1. An aluminum surface treatment process, comprising: preparing an aluminum material that contains 7.0 to 12.0% by mass of silicon and less than 1.5% by mass of magnesium; plasma nitriding the aluminum material to form an aluminum nitride region on a surface of the aluminum material, the plasma nitriding comprising: sputtering the aluminum material, before the plasma nitriding, to remove alumina from the surface of the aluminum material, wherein a sputtering current density is 0.018 to 52.9 μA/mm wherein the aluminum nitride region has a composite structure of alternating columnar and granular structure units linked together, wherein an inner surface of the aluminum nitride region in contact with the aluminum material comprises a columnar structure unit, a granular structure unit or a combination thereof, and wherein an outer surface of the aluminum nitride region, opposite from the inner surface of the aluminum nitride region, comprises a columnar structure unit, a granular structure unit or a combination thereof.