Influence of Laser Heat Treatment on Fracture Strength of Ceramic Thin Film

Abstract:

In our previous study, it has been shown that improvement of the adhesive strength and substrate hardness of ceramic coated steels without compromising the film hardness can be achieved by applying laser quenching. In the present research, in order to demonstrate further development of this method, the fracture strength of laser-irradiated ceramic thin films (CrAlN, TiAlN and CrN) was investigated by sphere indentation testing. To prevent heat-induced changes in the substrate hardness, a cemented carbide WC-Co rather than steel was used as substrate material. While the fracture strength of each film decreased significantly through furnace heat treatment, it remained almost unchanged in case of the laser irradiated films. Laser quenching has been shown to effectively reduce the fracture strength loss of the ceramic thin films in coated steels.

• Periodical: Advanced Materials Research (Volume 566)
• Pages: 145-149
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.566.145
• Online since: September 2012
• Authors: Hirotaka Tanabe, Keiji Ogawa, Yui Izumi, Tohru Takamatsu, Heisaburo Nakagawa, Takuya Saraie, Mitsuhiro Gotoh, Hideki Hagino, Takuto Yamaguchi
• Keywords: Cemented Carbide, Contact Stress, Fracture, Heat Treatment, Laser, Thin Film

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