Abstract
SiC/BN nanocomposite powders with the microstructure of micrometer‐sized SiC particles coated with nanometer‐sized BN particles were prepared via a chemical reaction, which used a mixture of boric acid (H3BO3) and urea (CO(NH2)2) as reactants coated on the surface of the SiC particles to react under a nitrogen‐gas atmosphere. The results of XRD, TEM, and SAED studies showed that the coating layer (BN) was composed mostly of amorphous and nanometer‐sized BN particles at the reaction temperature of 850°C. When the nanocomposite powders were hot‐pressed at 1850°C, machinable SiC/BN ceramic nanocomposites with fine grain size and homogeneous microstructure were fabricated. The composite that contained 20 wt% BN exhibited high strength (the three‐point bending strength was 588.4 ± 26.8 MPa) and excellent machinability.
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