skip to main content
OSTI.GOV title logo U.S. Department of Energy
Office of Scientific and Technical Information

Title: Measurement of temperature and absorptance for laser processing applications

Abstract

The use of CO[sub 2] lasers has been successfully demonstrated for several manufacturing processes such as cutting, drilling, scribing, etc., of a wide range of materials. The absorptance of a material at the laser wavelength and at the material removal temperature substantially affect the efficiency of the laser machining process. Some materials have absorption bands in the mid-infrared and the absorptance changes drastically with temperature at the CO[sub 2] laser wavelength of 10.6 [mu]m. Additionally, the absorptance of a material can change due to high-temperature effects such as decomposition, oxidation, etc., necessitating the measurement of absorptance at temperatures close to the material removal temperature and, preferably, during the laser machining process. A relatively simple experimental set-up is presented for the measurement of material removal temperature and of the absorptance of ceramic materials at the CO[sub 3] laser wavelength and at temperatures close to the material removal temperature. Experimental results have been obtained for hot-pressed silicon nitride and two continuous-fiber ceramic matrix composites, namely, carbon fibers embedded in a silicon carbide matrix (C/SiC) and silicon carbide fibers in a silicon carbide matrix (SiC/SiC). Temperatures were measured using an optical pyrometer while the absorptance measurements were performed with an integrating sphere. Themore » material removal temperatures show good agreement with extrapolated equilibrium decomposition data; the absorptance data were found to be repeatable to within [+-] 0.03.« less

Authors:
;  [1]
  1. (Pennsylvania State Univ., University Park, PA (United States). Dept. of Mechanical Engineering)
Publication Date:
OSTI Identifier:
6986354
Resource Type:
Journal Article
Journal Name:
Journal of Laser Applications; (United States)
Additional Journal Information:
Journal Volume: 6:1; Journal ID: ISSN 1042-346X
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; CARBON FIBERS; LASER BEAM MACHINING; COMPOSITE MATERIALS; TEMPERATURE MEASUREMENT; SILICON CARBIDES; SILICON NITRIDES; CARBON DIOXIDE LASERS; EXPERIMENTAL DATA; PERFORMANCE; REMOVAL; CARBIDES; CARBON COMPOUNDS; DATA; FIBERS; GAS LASERS; INFORMATION; LASERS; MACHINING; MATERIALS; NITRIDES; NITROGEN COMPOUNDS; NUMERICAL DATA; PNICTIDES; SILICON COMPOUNDS; 360201* - Ceramics, Cermets, & Refractories- Preparation & Fabrication; 360601 - Other Materials- Preparation & Manufacture

Citation Formats

Ramanathan, S., and Modest, M.F.. Measurement of temperature and absorptance for laser processing applications. United States: N. p., 1994. Web. doi:10.2351/1.4745334.
Ramanathan, S., & Modest, M.F.. Measurement of temperature and absorptance for laser processing applications. United States. doi:10.2351/1.4745334.
Ramanathan, S., and Modest, M.F.. Tue . "Measurement of temperature and absorptance for laser processing applications". United States. doi:10.2351/1.4745334.
@article{osti_6986354,
title = {Measurement of temperature and absorptance for laser processing applications},
author = {Ramanathan, S. and Modest, M.F.},
abstractNote = {The use of CO[sub 2] lasers has been successfully demonstrated for several manufacturing processes such as cutting, drilling, scribing, etc., of a wide range of materials. The absorptance of a material at the laser wavelength and at the material removal temperature substantially affect the efficiency of the laser machining process. Some materials have absorption bands in the mid-infrared and the absorptance changes drastically with temperature at the CO[sub 2] laser wavelength of 10.6 [mu]m. Additionally, the absorptance of a material can change due to high-temperature effects such as decomposition, oxidation, etc., necessitating the measurement of absorptance at temperatures close to the material removal temperature and, preferably, during the laser machining process. A relatively simple experimental set-up is presented for the measurement of material removal temperature and of the absorptance of ceramic materials at the CO[sub 3] laser wavelength and at temperatures close to the material removal temperature. Experimental results have been obtained for hot-pressed silicon nitride and two continuous-fiber ceramic matrix composites, namely, carbon fibers embedded in a silicon carbide matrix (C/SiC) and silicon carbide fibers in a silicon carbide matrix (SiC/SiC). Temperatures were measured using an optical pyrometer while the absorptance measurements were performed with an integrating sphere. The material removal temperatures show good agreement with extrapolated equilibrium decomposition data; the absorptance data were found to be repeatable to within [+-] 0.03.},
doi = {10.2351/1.4745334},
journal = {Journal of Laser Applications; (United States)},
issn = {1042-346X},
number = ,
volume = 6:1,
place = {United States},
year = {1994},
month = {3}
}