Abstract
Titanium substrates were ion plated with aluminium, producing under certain conditions a graded interface 5 μm deep. The graded interface consists of a solid solution of aluminium in titanium together with TiAl 3. The solid solution has a near perfect hexagonal close-packed structure and the hardness of the interface is about 850 VHN. The combination of increased hardness and modified structure results in low friction coefficients and wear rates, and the ion-plated aluminium film provides excellent corrosion resistance. Thus the method has immense practical application in preventing seizure and corrosion in aircraft fasteners.
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