Sialon ceramic with gradient microstructures

In order to combine the high hardness of alpha -Sialon and high toughness of beta -Sialon, a graded Sialon ceramic was developed in this work. The microstructures and the properties of the graded Sialon ceramic change gradually from spherical alpha -Sialon grains on the surface (HV10=19 GPa, HV0.1=3...

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Bibliographic Details
Published inSurface & coatings technology Vol. 100-101; no. 1-3; pp. 320 - 323
Main Authors Chen, L, Kny, E, Groboth, G
Format Journal Article
LanguageEnglish
Published 16.06.1997
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Summary:In order to combine the high hardness of alpha -Sialon and high toughness of beta -Sialon, a graded Sialon ceramic was developed in this work. The microstructures and the properties of the graded Sialon ceramic change gradually from spherical alpha -Sialon grains on the surface (HV10=19 GPa, HV0.1=34 GPa, and K sub 1c =4.3 MPam exp 1/2 ) to elongated beta -Sialon grains in the inner core (HV10=15.7 GPa, HV0.1=24 GPa and K sub 1c =7.3 MPam exp 1/2 ). Mixtures of the alpha -Sialon grains and the beta -Sialon grains were observed in the transitional zone with hardness HV0.1=24-30 GPa. The graded Sialon ceramic was produced in situ by using a green compact starting from a homogeneously mixed powder mixture.
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ISSN:0257-8972