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LaserablationbehaviorsofC/SiCcompositesinair

, PP. 37-47

Keywords: laser,ablation,C/SiC,finite,element,analysis,surface,temperature,ablation,profile,ablation

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Abstract:

Ablationbehaviorsofsiliconcarbide(SiC)coated2Dcarbonfiberreinforcedsiliconcarbidematrix(designatedas2DC/SiC)compositespreparedbychemicalvaporinfiltration(CVI)wereinvestigatedbyacontinuouswaveCO2laser.The2DC/SiCspecimenswereexposedunderlaserfor0.5sinambientair,andthelaserpowersvariedfrom500Wto1500W.A3Dfiniteelementmodelwasestablishedtocalculatethetemperaturedistributioninthelaserablationprocess.Theablationdepth,widthandprofileweremeasuredbyLaserConfocalMicroscope(LCM).Theresultsindicatethattheincreaseofablationdepthfollowsalinearrelationwiththeincreaseoflaserpower,andtheincreaseofablationwidthfollowsasimilartrendwiththeincreaseoftheisothermdiameterof1712℃.Theablatedsurfacecanbedistinguishedintothreedifferentregionsbyscanningelectronmicroscope(SEM)observation,includingablationcenter,transitionzoneandablationfringe.TheablationbehaviorsofcarbonfibersandSiCmatricesindifferentregionswerepresentedanddiscussedinthestudy.

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