Effects of optical absorbance with ablation characteristics in femtosecond laser irradiation of carbon reinforced Al2O3 composites. (2nd April 2016)

• Record Type: Journal Article
• Authors: Lee, J. Y.; Kang, M. C.; Kim, K. H.; Park, W. I.; Cho, S. H.
• Is Part Of: Advances in applied ceramics. Volume 115:Number 3(2016)
• Page Start: 123
• Page End: 128
• Publication Date: 2016-04-02
• Subjects: Ceramic composites -- Carbon reinforcements -- Optical absorbance -- Femtosecond laser -- Ablation characteristics; Ceramics -- Periodicals; 620.1405
• DOI: 10.1179/1743676115Y.0000000046
• Languages: English
• ISSNs: 1743-6753

Abstract

Abstract : The thresholds and depths of ablation of carbon [carbon nanotubes (CNTs) or graphene nanoplatelets (GNPs)] reinforced Al2 O3 composites were compared and correlated with those of monolithic Al2 O3 using femtosecond pulsed laser irradiation (λ = 1027 nm, τP = 380 fs). These composites were processed using a spark plasma sintering method ( T s = 1500°C, τs = 10 min and P = 40 MPa) through which highly densified (more than 97%) composites were fabricated. The optical absorbance of each composite improved in the wavelength range from ultraviolet to near infrared. Compared with the corresponding values for monolithic Al2 O3, the ablation thresholds of CNT/Al2 O3 and GNP/Al2 O3 were 50 and 75% lower respectively, and their ablation depths were two to three times deeper.