Abstract
The synthesis of Al28C6O21N6 powder (ALCON), starting from the binary compounds is described. The powder is resistant to oxidation in air up to 760°C. From the prepared powder, fully dense ceramics have successfully been prepared using hot pressing. The as-prepared ceramics had a thermal conductivity of 20 W m−1 K−1. Experiments showed that it is also possible to prepare ALCON ceramics by reactive hot-pressing, starting from Al2O3, AlN and Al4C3. Further optimization is expected to raise the thermal conductivity significantly. The strength, about 300 MPa, is similar to that of AlN. The thermal expansion coefficient of 4.8 × 10−6K−1 closely matches that of silicon, making application of ALCON ceramics as heat sinks an interesting possibility.
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Groen, W.A., Van Hal, P.F., Kraan, M.J. et al. Preparation and properties of ALCON (Al28C6O21N6) ceramics. J Mater Sci 30, 4775–4780 (1995). https://doi.org/10.1007/BF01154484
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DOI: https://doi.org/10.1007/BF01154484