cwCO_2レーザ光による熱・光学特性の測定 : 鉄に対するCO_2レーザ光の吸収率に及ぼす表面状態の影響

概要

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A new measurement, equipment was introduced which can measure the thermal properties and the optical absorptance of CO_2 laser light by stepwise heating system using low power CO_2 laser light as the heat source. Following results are obtained as to absorption characteristics of iron materials. (1) The absorptance μ increases as the CLA surface roughness σ increases. The relation between μ and σ is represented as μ∝σ^0.35,where σ> 0.1μm. (2) The absorptance on roughed surfaces considerably reduces by diminishing the surface defects through annealing. The main cause of absorptance increase on roughed surfaces would not exist in surface roughness itself but in residual surface strain which increases the DC electric resistance of specimen surfaces. (3) The asorptance make higher as the carbon content in the specimen increases. (4) When the oxidized layer over O.l, μm thick is formed on the surface, the absorptance extremely increases. (5) The absorption characteristics under a high energy density condition of ca. 10^5 W/cm^2 which is often generated in actual laser machining processes show a similar tendency to those of (1)-(4), so that the fundamental measurement of absorp-tion by this stepwise heating method is usuful for analysing the laser machining phenomena and for selecting the machining conditions.
公益社団法人精密工学会の論文
1985-12-05