METHOD FOR FORMING HARD LAYER OF TITANIUM AND TITANIUM HAVING HARD LAYER FORMED BY THE SAME

摘要

The present invention is to form a hard layer having an excellent characteristics of low cost, yet functionally gradient on the surface of the titanium will be on the way. The method of forming the hard layer according to the invention, (a) In the titanium and the exhaust to the atmospheric pressure in the heat treatment device 10 ^-4 maintaining such that torr or less; (B) pre-heating from 10 to 5 minutes at 730 ~ 800 by removing the titanium oxide film formed on the surface of the titanium dioxide; (C) nitrogen in the heat-treating apparatus, oxygen, by injecting at least one gas selected from carbon dioxide and heated for 30 minutes to 20 wherein the time at 740 ~ 950 , the concentration gradient of the gas to the surface of the titanium alloy stage such that the hard layer is formed with; And (d) cooling the titanium dioxide; and a ;