| 가스압 소결된 질화규소의 R-Curve 거동 |
| 김상섭, 김성진, 백성기 |
| 포항공과대학 재료·금속공학과 |
| R-Curve Behavior in a Gas-Pressure Sintered Silicon Nitride |
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| ABSTRACT |
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R-curves, fracture resistance (KR) as a function of crack extension (Δa), of a gas-pressure sintered monolithic Si3N4 were determined by controlled flaw/strength technique. Rising R-curve behavior was observed, confirming the operation of microstructural toughening process during crack growth. The R-curve parameters, k and m in the equation, KR=k(Δa)m, were determined to 30.301 and 0.1146, respectively. Microstructural observation of growing crack revealed that the bridging in the crack wake by unbroken ligament of large elongated ${beta}$-grains was the mechanism primarily for the rising R-curve behavior. |
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