Brenner, B.B.BrennerBonss, S.S.BonssScheibe, H.H.ScheibeZiegele, H.H.Ziegele2022-03-082022-03-082002https://publica.fraunhofer.de/handle/publica/305335NOVELTY - Surface layer structure for titanium and its alloys consists of a 200-400 nm thick hard amorphous carbon layer (4), a 5-50 nm thick intermediate layer (3) and a 0.3-2.0 nm thick laser gas alloyed layer (2) having a hardness of 600-1400 HV0.1. DETAILED DESCRIPTION - An INDEPENDENT CLAIM is also included comprising melting the component surfaces to be protected with a high performance laser. The laser density p of the laser beam is 1 x 104 to 2 x 105 W/cm2. Melting is carried out at an oxygen partial pressure of less than 5 ppm. The reactive atmosphere consists of N2 and Ar, in which a relative nitrogen content of 40-80% is chosen. A degree of overlapping is expressed as: U = (a-c)/a (where a and c are track widths). The component is polished to a surface roughness of not more than 0.2 microns and purified in a high vacuum apparatus. The intermediate layer is applied by a vacuum arc process and the hard amorphous carbon layer also deposited by a vacuum arc process. USE - To pro tect oscillating human implants and for use in air and space travel. ADVANTAGE - The structure is highly wear resistant.de608667621671patent1997-19751337