Titanium alloy having a hard layer formed by the process and which forms a hard layer of titanium

摘要

The present invention, on the surface of the titanium, at low cost, is excellent while, to a method capable of forming a hard layer having also the properties of the FGM. The method of forming the hard layer according to the present invention, (a) heat treatment apparatus of titanium were introduced into and evacuated, the step to maintain such pressure is less than ¹⁰ -4 torr; ^730~800 ℃ to (b) the titanium in and heated 10 minutes to 5 hours, the pre-processing step to remove the oxide film formed on the surface of the titanium; (c) in the heat treatment apparatus, nitrogen, oxygen, one or more gases selected from carbon The injected and heated 30 minutes to 20 hours at 740~950 ℃ the titanium, the step is so hard layer is formed having a concentration gradient of the gas on the surface of the titanium alloy; and, (d) the It includes the; step of cooling the titanium.