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EVOLUTION OF SURFACE TECHNOLOGIES FOR TITANIUM ALLOYS

Titanium alloys with superior corrosion resistance, high specific strength, stable performance at moderate temperatures are restricted in application owing to its inherent shortcomings such as sensitive to adhesive wear, fretting wear, oxidation and poorly adhesive to polymer, metals and ceramic coatings The strategies and ways to overcome above shortcomings by surface technologies for titanium alloys are described It is pointed out that Ag, Cd plating is used for anti wear at low temperature and Co+CrO 3 composite plating and anode oxidation with dry lubricant and so on are used for anti wear at moderate temperatures. Ti x Al y N coatings represent the developing direction on anti wear for titanium alloys at elevated temperatures.