Fibrous Grain-Aligned Silicon Nitrides Large Grains

Fibrous Crain-Aligned Silicon Nitrides (Large Grains) 

Another feature of this material is its narrow distribution of the fracture strength. When the strength distribution was expressed in Weibull statistics, the Weibull modulus was 46 - substantially higher than the value of 26 obtained for a conventional, self-reinforced silicon nitride. Thus, the seeded and tape-cast silicon nitride showed a synergistic improvement in all of the important fracture attributes, such as fracture strength, fracture toughness, and strength stability (Weibull modulus). 

P-seed crystals, hot-pressed at 1750°C for 0.33 h (d) p-powder without p-seed crystals, hot-pressed at 1750°C for 2 h. Reprinted with permission from Ref [21] 1998, Blackwell 

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Figure 8.21 Microstructures of porous silicon nitride with large fibrous grain alignment (porosity 14%). Reprinted with permission from Ref [50] 2000, Blackwell Publishing, Inc.

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