Abstract
The synthesis of CaSiN2 powder, starting from metal nitrides, is described. Fully dense CaSiN2 ceramics can be sintered from the prepared powder at 1700 °C. The samples were sintered in a closed Mo vessel to prevent evaporation of calcium nitride. The phase composition, and the chemical and mechanical properties of the as-prepared ceramics are described. The thermal conductivity at room temperature was evaluated as 2.4 Wm−1 K−1. A reasonable strength of 179 MPa and a fairly good fracture toughness of about 2.1 MPam1/2 were found. A hardness of 9.6 GPa and a Young's modulus of 174 GPa were measured. The value of the relative dielectric constant was measured as 13.3. The bandgap for CaSiN2 at room temperature was estimated from diffuse-reflectance spectra to be 4.5 eV. Considerable improvement in the properties are expected when the processing conditions which is well within reach are optimized.
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Groen, W.A., Kraan, M.J. & De With, G. New ternary nitride ceramics: CaSiN2 . JOURNAL OF MATERIALS SCIENCE 29, 3161–3166 (1994). https://doi.org/10.1007/BF00356657
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DOI: https://doi.org/10.1007/BF00356657