Aqueous tape casting of B 4 C ceramics

Abstract

B₄C green tapes are prepared by aqueous tape casting and a spark plasma sintering (SPS) process using polyethylenimine (PEI) as dispersant, hydroxypropyl methyl cellulose (HPMC) as binder and polyethylene glycol (PEG) as plasticiser. The influences of solid content, dispersant content, mass ratio of plasticiser to binder (R value) and milling time on the slurry viscosity are studied. The samples are characterised by means of hardness tester, universal testing machine and scanning electron microscopy. The results indicate that the solid content of B₄C slurry achieves 47.5 wt-% with milling time of 12 h when the content of PEI, HPMC and PEG is 1.5, 5 and 5 wt-%, respectively. The relative density of B₄C ceramics subject to SPS at 1600°C and 50 MPa for 8 min is up to 97.2%. The Vickers hardness, flexural strength and fracture toughness of B₄C ceramics reach 36.5 ± 0.7 GPa, 510.3 ± 19.4 MPa and 5.04 ± 0.29 MPa m^−1/2, respectively.

Keywords

Aqueous tape casting SPS Mechanical properties

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