ividedintothreelayers.TheinnerlayerisCVDSiClayer,themediumlayerisboron-containinglayer(BNorBC),andtheouterisCVDSiClayer.Athightemperatures,BO-SiOglassisformedfromtheoxidationofboron-containinglayerandSiCandsealseasilythemicro-crackstoprotectthecomposites[,].Theservicetemperatureofthiskindcoatingislowerthan℃becausetheborateglassesexhibithighvaporpressureathightemperature.Inordertoimprovetheservicetemperatureofoxidationprotectioncoating,itisnecessarytodevelopnewkindofcoatingmaterialssystem.Thispaperisacontinuationofanarticlespublishedpreviously[-],andtheaimsare(i)developanewkindofoxidationprotectioncoatingforC/SiCcompositeswhichcouldbeutilizedabove℃;(ii)investigatetheoxidationbehaviorofcoatedC/SiCcomposites,and;(iii)examinetheeffectsofoxidationonthemechanicalpropertiesandfailurebehaviorofthecomposites..Experimentalprocedure..Preparationofthreedimensionalcarbon/siliconcarbidecompositesPAN-basedcarbonfiberwasemployedandeachyarncontainedfilaments.Thefabricpreformwasprepared