简介：Theswunggelfiberswereheatedto400℃at0.5,1,1.5,2,2.5,3and4℃·min-1ofheatingrate,respectively,andsoakedfor1h;thenheatedto600℃at3℃·min-1ofheatingrateandsoakedfor1h;atlastcalcinedat1000,1100,1200,1300,and1400℃for1h,respectively.Theaveragesinglefibertensilestrengthsoffibersaftercalciningat600℃orhighertemperaturesweredeterminedandtheirsurfacemorphologywasobserved.Theresultsshowthat:(1)whentheheatingratebelow400℃is0.5-1℃·min-1,theaveragesinglefibertensilestrengthsof95polycrystallinealuminafibersaftercalciningat600℃and1000-1100℃exceed1000and800MPa,respectively,surfaceofthefibersaftercalciningat1000-1100℃issmooth,α-Al2O3appearsat1200℃,andalargeamountofα-Al2O3formsabove1300℃;(2)whentheheatingrateexceeds3℃·min-1,thefiberspulverizeobviously.
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