Correlation between Mechanical Strength and Surface Conditions of Laser Assisted Machined Silicon Nitride

  • F. M. Sciammarella
  • M. J. Matusky
Conference paper
Part of the Conference Proceedings of the Society for Experimental Mechanics Series book series (CPSEMS)

Abstract

High power fiber-coupled diode lasers for Laser-Assisted Machining (LAM) of ceramics provides an efficient, cost effective solution for surface finishing of ceramic products. This paper presents experimental evidence of advantages of LAM over the traditional diamond wheel grinding, a standard technique currently utilized in the finishing of ceramic surfaces. LAM, utilizing fiber-coupled diode lasers, also provides advantages over other types of lasers such as CO2 and Nd:YAG lasers. The emphasis of this work is in the evaluation of LAM in the strength of finished products of two different sources of silicon nitride. An optical technique based on evanescent illumination was utilized to measure the Ra of the finished surfaces utilizing LAM, laser glazed, diamond ground, and as-received surface conditions. Four point bending test for specimens of each surface condition were utilized to measure the fracture strength. A correlation was found between the measured Ra and the predicted strengths resulting from Weibull analysis. The correlation shows a decrease of strength with the increase of Ra. The fracture surfaces were observed both optically and with a SEM, and the flaw sizes were measured. The analysis of the fractographs indicated that the flaw sizes are consistent with Fracture Mechanics predictions. Explanations of the correlation between Ra, strength, and flaw sizes require further testing.

Keywords

Silicon Nitride Lasers Machining Flexure Strength Surface Roughness 

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Copyright information

© Springer Science+Businees Media, LLC 2011

Authors and Affiliations

  • F. M. Sciammarella
    • 1
  • M. J. Matusky
    • 1
  1. 1.College of Engineering & Engineering TechnologyNorthern Illinois UniversityDeKalbUSA

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