Transactions of the Korean Society of Mechanical Engineers A (대한기계학회논문집A)

The Korean Society of Mechanical Engineers (대한기계학회)
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A Steel Ball Impact Damage Behavior of RS-SiC Ceramic Materials

RS-SiC 세라믹 재료의 강구 입자충격 손상 거동

  • Oh, Sang-Yeob (School of Mechanical and Automotive Engineering, Kyungpook Nat'l Univ.)
  • 오상엽 (경북대학교 기계자동차공학부)
  • Received : 2010.03.26
  • Accepted : 2010.06.10
  • Published : 2010.08.01
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Abstract

In this study, the effect of the C/SiC composition ratio on the impact damage of a reaction sintered SiC (RS-SiC) plates was evaluated. An impact test was conducted by using an air gun. The impacter used was a steel ball with a diameter of 2 mm, and the impact velocities were 113, 122, and 180 m/s. The RS-SiC plates were $20\times20\times3$ mm with different C/SiC composition ratios. The ring crack diameters damaged by a steel ball were determined using SEM images. It was observed that the maximum diameter increased with increasing impact velocity, and it rapidly changed with increasing C/SiC composition ratio because of the effect of residual Si and the variation flexural strength. Cone cracks were formed in the case of C/SiC composition ratios of 0.4~0.5, this indicated that the impact damage changed from a ring crack to a cone crack in this critical range of C/SiC composition ratios. The C/SiC composition ratio of 0.3 was determined to be the optimal ratio for the RS-SiC manufacturing process.

본 연구에서는 반응소결 탄화규소(RS-SiC)의 제조공정 중에서 C/SiC 복합 비율(0.1, 0.3, 0.4, 0.5, 0.6, 0.7, 1.0)이 외부입자충격 손상 거동에 미치는 영향을 평가하였다. 충격시험은 공기총(air-gun)을 사용하였으며, 직경 2 mm 강구를 113 m/s, 122 m/s, 180 m/s의 충격속도로 RS-SiC 판재($20\times20\times3$ mm)에 충격시켜 발생된 링크랙의 직경 변화 및 콘크랙의 발생 거동을 SEM 영상으로 평가하였다. 결과적으로 RS-SiC에 발생한 링크랙의 최대직경이 충격속도가 증가함에 따라 대체로 증가하였지만, C/SiC 복합 비율에 따라서는 급격한 변화를 보였다. 이는 C/SiC 복합 비율에 따라 잔류 Si 함량 및 굽힘강도 변화의 영향으로 볼 수 있다. 특히 C/SiC 복합 비율이 0.4~0.5 범위에서 콘크랙이 발생됨에 따라 링크랙에서 콘크랙의 발생으로 변화되는 충격손상 메커니즘의 임계영역으로 판단할 수 있다. 아울러 콘크랙의 발생 임계영역을 고려할 때, RS-SiC 최적 제조 공정으로서 C/SiC 혼합 비율을 최대 0.3으로 하는 것이 효과적이다.

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References

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