Untersuchungen von PVD -Hartstoffschichten zur Steigerung der Tragfähigkeit und Verschleißfähigkeit

FKM 1996
Booklet No. 216
Project No. 170

Abstract:

For the heat-treatable steel 42CrMo4V and the case-hardening steel 16UnCr5E, increases in load-bearing capacity can be achieved by PVD coatings. This applies to both tooth root and tooth flank load-bearing capacity. In the area of fatigue strength, the tooth root load-bearing capacity can be increased by PVD coatings. For rolling stress on the tooth flanks, only tungsten carbide-carbon coatings achieve increases in running time. Coatings with a closed and compact structure are required for rolling stresses. The pre-treatment of the substrate surface before coating has a major influence. In the case of multi-layer coatings, a large hardness gradient must be avoided, which leads to coating flaking. PVD coatings can be used as wear protection for gears. In addition to gears, any type of rolling pairing that is exposed to comparable loads is suitable. Due to the low friction coefficients and the wear resistance of PVD coatings resulting from the high hardness, the service life of gear pairs that are operated without lubrication or with insufficient lubrication can be significantly increased by such coatings. In addition, PVD coatings serve as press protection for slow-running and insufficiently lubricated gears. Scope of report:
79 pages, 76 illustrations, 50 references Start of work:
01. 01. 1989 End of work:
31. 03. 1994 Sponsor:
AVIF / A 27 Author:
Dipl.-lng. J. leng Research unit:
Laboratory for Machine Tools and Production Engineering at RWTH Aachen University Head of institute:
Prof. Dr.-lng. Dr.-lng. E.h. M. Weck Supervising FVA working group:
Materials Chairman:
Dr. mont. F. Hengerer Supervising FVA working group:
PVD gear coatings References:
FVA -Research Report 1989, 1990, 1991, 1992, 1993 and 1994