Abstract
Sintering anisotropy in slip-cast SiC-whisker/Si3N4-powder compacts was studied at 1750°C in 0.1 MPa N2 or at 1825°C in 1.0 MPa N2. It was shown that whiskers oriented parallel to the mould surface and nearly 1.5-dimensionally along the slip flow direction when the whisker content was 10 wt%. Linear shrinkage was largest perpendicular to the mould surface and smallest perpendicular to the whisker alignment. It was shown that the retardation of densification by whiskers is due to the formation of a rigid network along the whisker alignment, which is in accordance with percolation theory. The addition of up to 20 wt% whisker did not affect sintering kinetics but lowered sinterability by 2-dimensional alignment of the whiskers. The anisotropy in fracture toughness is related to the orientation of the whiskers.
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Mitomo, M., Saito, SI., Matsuda, T. et al. Sintering anisotropy in slip-cast SiC-whisker/Si3N4-powder compacts. JOURNAL OF MATERIALS SCIENCE 28, 5548–5553 (1993). https://doi.org/10.1007/BF00367829
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DOI: https://doi.org/10.1007/BF00367829