Cold laser machining of nickel-yttrium stabilised zirconia cermets: Composition dependence

Journal Article · Tue Sep 15 00:00:00 EDT 2009 · Materials Research Bulletin

DOI:https://doi.org/10.1016/J.MATERRESBULL.2009.05.006· OSTI ID:22029856

Sola, D ^[1]; Gurauskis, J ^[1]; Pena, J I; Orera, V M ^[1]

---

1. Instituto de Ciencia de Materiales de Aragon, CSIC- Universidad de Zaragoza, C/ Pedro Cerbuna 12, E-50009, Zaragoza (Spain)

Cold laser micromachining efficiency in nickel-yttrium stabilised zirconia cermets was studied as a function of cermet composition. Nickel oxide-yttrium stabilised zirconia ceramic plates obtained via tape casting technique were machined using 8-25 ns pulses of a Nd: YAG laser at the fixed wavelength of 1.064 {mu}m and a frequency of 1 kHz. The morphology of the holes, etched volume, drill diameter, shape and depth were evaluated as a function of the processing parameters such as pulse irradiance and of the initial composition. The laser drilling mechanism was evaluated in terms of laser-material interaction parameters such as beam absorptivity, material spallation and the impact on the overall process discussed. By varying the nickel oxide content of the composite the optical absorption (-value is greatly modified and significantly affected the drilling efficiency of the green state ceramic substrates and the morphology of the holes. Higher depth values and improved drilled volume upto 0.2 mm{sup 3} per pulse were obtained for substrates with higher optical transparency (lower optical absorption value). In addition, a laser beam self-focussing effect is observed for the compositions with less nickel oxide content. Holes with average diameter from 60 {mu}m to 110 {mu}m and upto 1 mm in depth were drilled with a high rate of 40 ms per hole while the final microstructure of the cermet obtained by reduction of the nickel oxide-yttrium stabilised zirconia composites remained unchanged.

• OSTI ID: 22029856
• Journal Information: Materials Research Bulletin, Vol. 44, Issue 9; Other Information: Copyright (c) 2009 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); ISSN 0025-5408
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ABSORPTION
ABSORPTIVITY
CERAMICS
CERMETS
DEPOSITION
INTERACTIONS
LASER BEAM MACHINING
LASER MATERIALS
MICROSTRUCTURE
MORPHOLOGY
NEODYMIUM LASERS
NICKEL OXIDES
SUBSTRATES
YTTRIUM
ZIRCONIUM OXIDES