Three-dimensional laser machining of structural ceramics

Three- dimensional laser machining of structural ceramics such as alumina (Al 2O 3), silicon nitride (Si 3N 4), silicon carbide (SiC) and magnesia (MgO) was carried out using a 1.06 μm wavelength pulsed Nd:YAG laser. The rate of machining predicted in terms of material removed per unit time (mg/s) i...

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Bibliographic Details
Published in:Journal of manufacturing processes 2010, Vol.12 (1), p.1-7
Main Authors: Samant, Anoop N., Dahotre, Narendra B.
Format: Article
Language:English
Subjects:
Analytical and numerical techniques
Applied sciences
Ceramics
Comparative analysis
Exact sciences and technology
Fundamental areas of phenomenology (including applications)
Heat transfer
Lasers
Machine tools
Mechanical engineering. Machine design
Physical properties
Physics
Silicon nitride
Studies
Thermography
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Summary:Three- dimensional laser machining of structural ceramics such as alumina (Al 2O 3), silicon nitride (Si 3N 4), silicon carbide (SiC) and magnesia (MgO) was carried out using a 1.06 μm wavelength pulsed Nd:YAG laser. The rate of machining predicted in terms of material removed per unit time (mg/s) increased with an increase in heating rate (K/s). A thermal model based on temperature dependent absorptivity and thermophysical properties, in addition to conduction, convection and radiation based heat transfer, was developed to predict material removal rate. Predicted values were compared with actual measurements made from machined cavities. Such a study would enable advance predictions of the laser processing conditions required to machine cavities of desired dimensions.
ISSN:1526-6125
2212-4616
DOI:10.1016/j.jmapro.2010.01.001