Fabrication of homogenous dispersion TiB₂-Al₂O₃ composites

Abstract

In order to get a homogenous mixture and compact of TiB₂-Al₂O₃, hybridization as a surface modification method was used to prepare nano-scale Al₂O₃ coated TiB₂ particles. PE-wax particles were first coated onto TiB₂ particles by hybridization, and then the nano-scale Al₂O₃ particles were coated onto the surface of TiB₂ coated by PE-wax particles again. SEM, TEM and EDS were used to characterize the microstructure of as-received core/shell particles and its compacts. The experimental results show that a particle-scale homogenous dispersion of TiB₂ and Al₂O₃ can be formed not only in mixed powder but also in dewaxed compacts. The compacts then were sintered by gas-pressing sintering (GPS). Finial products show improved mechanic properties comparing with reference samples fabricated by normal ways.

Keywords

TiB₂/Al₂O₃ / hybridization / dispersion

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