Patent ID: 7918944

Claim:
A surface carburization technique for forming a medical titanium alloy femoral head for use in hip arthroplasty, comprising: a. placing a medical titanium alloy TC4 femoral head in an acetone solution, and cleaning by ultrasonics for about 30 min; b. placing the medical titanium alloy TC4 femoral head in a vacuum carburization furnace, evacuating the furnace to about 100 Pa, heating the furnace to about 1300° C., and holding the temperature constant; c. introducing C 2 H 2 in the vacuum carburization furnace forming a TiC ceramic on the femoral head until the pressure reaches to about 2000 Pa in the furnace; d. evacuating and discharging gas resulting from C 2 H 2 decomposition; e. repeat the steps c and d about every 30 min for about 4 times, then stop heating, while continuously evacuating; f. stopping evacuation when furnace temperature is cooled to about 25° C., and taking out from the furnace the resulting medical titanium alloy TC4 femoral head; and g. then polishing the surface of the resulting femoral head to obtain the medical titanium alloy TC4 femoral head for use in hip arthroplasty with a TiC ceramic surface thereon.