采用压痕加载的方式在固相烧结碳化硅陶瓷材料的抛光表面分别加载维氏及努氏压头,获得不同形貌的表面裂纹,系统地研究了表面裂纹尺寸及裂纹倾斜角对材料强度的影响.实验结果表明,当尖锐的维氏裂纹尺寸约为10 μm时,该裂纹开始主导材料的断裂过程并导致材料强度的下降,而维氏压痕约3μm左右时,材料的强度几乎不受影响.研究还表明,1～2 N载荷下较小尺寸的努氏裂纹对材料强度具有一定的影响,但无规律性;5N以上载荷下尺寸较大的努氏裂纹在断裂过程中易发生偏转而主导材料的断裂,实验推导得出裂纹倾斜角θ与相应的四点弯曲强度σ存在关系式:σ∝ (sinθ)-1/2.
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