Nanosilver‐Coated Porous SiC–Si 3 N 4 Composite Using Microwave‐Assisted Process

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Using a novel microwave‐assisted process, nano‐Ag‐coated continuous porous SiC–Si 3 N 4 substrate was fabricated from a solution containing AgNO 3 salts and ethylene glycol. The detailed microstructure of the fabricated substrate was investigated depending on the amount of AgNO 3 salts in the starting solution and the microwave irradiation time. From a solution containing 0.4 g of AgNO 3 for 60 s irradiation time, the Ag nanoparticles, ∼25 nm in diameter, were homogeneously coated on the continuous porous SiC–Si 3 N 4 matrix as well as on the surface of the Si 3 N 4 whiskers. However, the Ag nanoparticles (∼15 nm) deposited from a solution containing 0.6 g of AgNO 3 for 60 s irradiation time showed maximum homogeneity and narrow size distribution. The components of Si, N, and Ag were homogeneously distributed on the deposited layer. The deposited Ag nanoparticles covered with a thin (∼2 nm), amorphous layer had nanocrystallinity and adhered well to the surface of the Si 3 N 4 whiskers.