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β-Si 3 N 4  whiskers with a diameter of 0.2 – 1.7 μm and length of over 100 μm were synthesized by means of microwave sintering at 1550 °C for 30 min in a flowing nitrogen atmosphere. The β-Si 3 N 4  whiskers grew on Si 3 N 4  substrate without catalyst by the vapor–liquid–solid mechanism. Microwave energy and Y 2 O 3 –Al 2 O 3 –ZrO 2  additives played a significant role in the growth of β-Si 3 N 4  whiskers. The microwave energy provided an orientation temperature gradient and the additives formed the low viscosity glass phase at a low eutectic temperature.

Fabrication of β-Si 3 N 4 whiskers by microwave sintering using ZrO 2 –Y 2 O 3 –Al 2 O 3 as liquid phase