METHOD FOR FORMING A HARD LAYER ON TITANIUM AND A TITANIUM ALLOY WITH THE HARD LAYER FORMED BY THE SAME, CAPABLE OF OBTAINING A HARD LAYER OF EXCELLENT MATERIAL PROPERTIES AT LOW COST

摘要

PURPOSE: A method for forming a hard layer on titanium and a titanium alloy with the hard layer formed by the same are provided to enable the removal of an oxide film and the formation of an inclined coating layer with a single device.;CONSTITUTION: A method for forming a hard layer on titanium includes the following steps of: inserting titanium into a heat treatment device and maintaining atmospheric pressure at 10-4torr or less by exhausting gas from the heat treatment device; removing an oxide film formed on the surface of the titanium by heating the titanium at a temperature of 730-800°C for 10 minutes to 5 hours; forming the hard layer having a concentration gradient of the gases on the surface of the titanium alloy by injecting one or more kinds of gases selected from nitrogen, oxygen, and carbon and heating the titanium at a temperature of 740-950°C for 30 minutes to 20 hours; and cooling the titanium.;COPYRIGHT KIPO 2013;[Reference numerals] (AA) Temperature (°C); (BB) Time (hrs)