Abstract No.:
5305

 Scheduled at:
Thursday, June 08, 2017, Hall 26 3:00 PM
Laser Cladding & PTA


 Title:
Aptitude of different types of carbides for production of endurable rough surfaces by laser dispersing

 Authors:
Andreas Wank* / GTV Verschleißschutz GmbH, Germany
Christian Schmengler / GTV Verschleiss-Schutz GmbH, Germany
Karin Müller-Roden/ GTV Verschleiss-Schutz GmbH, Germany
Frank Beck/ GTV Verschleiss-Schutz GmbH, Germany
Thomas Schläfer/ GTV Verschleiss-Schutz GmbH, Germany

 Abstract:
Surfaces with defined, long-term stable roughness are needed in various applications e.g. for traction control in logistic centres, paper conveyors in paper or printing machines, metal sheet conveyors in steel or aluminium mills, fixation of semi-finished parts in moulds, etc.. Laser dispersing is an alternative to deposition of rough, wear resistant coatings that results in only small change of the respective components surface contour and features metallurgical bonding between the component material that acts as metallic matrix and the dispersed material as a prerequisite for high durability.
Different types of tungsten carbide materials (fused tungsten carbide, Ni-clad fused tungsten carbide, macrocrystalline WC and sintered and crushed WC/Co) are used for laser dispersing of construction steel surfaces. Surface roughness analyses and metallographical evaluation of cross sections concerning efficiency of carbide embedding as well as crack formation tendency are carried out. Generally, all types of tested carbides permit production of rough surfaces with metallurgical bonding to the metallic matrix, but only use of Ni-clad fused tungsten carbide permits to prevent crack formation.
The effectiveness of aluminium alloy laser dispersing with silicon carbide is compared to dispersing with silicon. Both silicon and silicon carbide qualify for production of rough surfaces by laser dispersing. While silicon carbide particles show higher hardness, use of silicon does not include danger of embrittlement due to formation of aluminium carbide.


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