TY - JOUR
TI - Effect of variation of egg-shell particulate reinforcement on ultrasonic pulse velocity, attenuation, and hardness prediction in ceramic-metal composites
AU - Bilici Vildan Ozkan
AU - Pesmen Gunnur
AU - Yonetken Ahmet
AU - Erol Ayhan
JN - Thermal Science
PY - 2023
VL - 27
IS - 4
SP - 3179
EP - 3188
PT - Article
AB - In this study, ceramic-metal composite material reinforced with additive  prepared from waste egg-shell was produced. Waste egg-shells were cleaned,  dried, ground and then sieved. The effects of egg-shell reinforcement ratio  (0%, 1.66%, 3.34%, 5%, and 6.66 % by volume) and sintering temperature (1400°C) applications on Fe-B4C ceramic-metal powders were tested. For this  purpose, tests such as ultrasonic test, hardness and density were applied to  the composite material, and finally, microstructural analysis was performed  on the composites by SEM application. The changes in the crystal structure  of the egg-shell after sintering were revealed by diffractograms analysis.  It was observed that the hardness, ultrasonic longitudinal and transverse  wave velocities also increased with the increase in the reinforcement  ratios of the egg-shell. Considering the 6.66% egg-shell addition to the  ceramic-metal composite mixture, in the light of the numerical data  obtained, 5091 m/s longitudinal wave velocity, 2809 m/s transverse wave  velocity, 204.12 Hv hardness value, 0.315 dB per mm longitudinal attenuation  and 0.214 dB per mm transverse attenuation values with gave the best  physical and mechanical properties. According to the test results obtained,  it was determined that it would be appropriate to use the egg-shell in the  production of composite materials and to characterize it with the  ultrasonic test method.