TY - GEN
T1 - Physical, microstructure enhancement of K0.5Na0.5NbO3- based lead-free ceramics prepared via two-step sintering
AU - Saari, Muhammad Qusyairie
AU - Mohamed, Julie Juliewatty
AU - Bahanurddin, Nor Fatin Khairah
AU - Jumali, Mohammad Hafizuddin
AU - Rahman, Mohd Fariz Ab
AU - Yuwono, Akhmad Herman
N1 - Publisher Copyright:
© 2022 Author(s).
PY - 2022/6/9
Y1 - 2022/6/9
N2 - Electroceramic material of K0.5Na0.5NbO3-based lead-free ceramics has a high potential application to be used as sensors, actuators and transducers. To realize the potential of K0.5Na0.5NbO3, the material must exhibit a high density with homogenous grain size. In this work, the two-step sintering was used to enhance the density and microstructure of the K0.5Na0.5NbO3 (KNN) ceramic to produce better densification. The microstructure of the upper surface and cross section of the KNN pellet as a function of the different sintering conditions are systematically studied using Field Emission Scanning Electron Microscopy (FESEM). The calcined powder was pressed into a pellet using a hydraulic hand press with a pressure of 0.3 tons for 1 min. The KNN pellet then was sent to sinter through conventional sintering and two-step sintering. In the two-step sintering, the first step was sintered at 1120 °C for 10 minutes of soaking time and the second step was sintered at 1070 °C for 10 hours of soaking time. The surface of the sintered specimens under investigation is well polished and thermally etched below the sintering temperature. Evident from the microstructure reveals a highly dense spherical, cubic and rounded shape of grains were received better compactness for samples sintered via two-step sintering compared with conventional sintering that has a large pore between the grain. The sample sintered through two-step sintering showed the highest density (4.244536 g/cm3) compared to the sample sintered through conventional sintering (4.117893 g/cm3).
AB - Electroceramic material of K0.5Na0.5NbO3-based lead-free ceramics has a high potential application to be used as sensors, actuators and transducers. To realize the potential of K0.5Na0.5NbO3, the material must exhibit a high density with homogenous grain size. In this work, the two-step sintering was used to enhance the density and microstructure of the K0.5Na0.5NbO3 (KNN) ceramic to produce better densification. The microstructure of the upper surface and cross section of the KNN pellet as a function of the different sintering conditions are systematically studied using Field Emission Scanning Electron Microscopy (FESEM). The calcined powder was pressed into a pellet using a hydraulic hand press with a pressure of 0.3 tons for 1 min. The KNN pellet then was sent to sinter through conventional sintering and two-step sintering. In the two-step sintering, the first step was sintered at 1120 °C for 10 minutes of soaking time and the second step was sintered at 1070 °C for 10 hours of soaking time. The surface of the sintered specimens under investigation is well polished and thermally etched below the sintering temperature. Evident from the microstructure reveals a highly dense spherical, cubic and rounded shape of grains were received better compactness for samples sintered via two-step sintering compared with conventional sintering that has a large pore between the grain. The sample sintered through two-step sintering showed the highest density (4.244536 g/cm3) compared to the sample sintered through conventional sintering (4.117893 g/cm3).
UR - http://www.scopus.com/inward/record.url?scp=85132824674&partnerID=8YFLogxK
U2 - 10.1063/5.0079068
DO - 10.1063/5.0079068
M3 - Conference contribution
AN - SCOPUS:85132824674
T3 - AIP Conference Proceedings
BT - International Conference on Bioengineering and Technology, IConBET2021
A2 - Mohamad, Mardawani
A2 - Sulaiman, Muhammad Azwadi
A2 - Wan Osman, Wan Hasnidah
A2 - Mohammad, Rosmawan
A2 - Amini, Mohd Hazim Mohamad
A2 - Wee, Seng Kew
A2 - Shoparwe, Noor Fazliani
A2 - Boon, Jia Geng
A2 - Wong, Yee Ching
A2 - Mamat, Sarizam
PB - American Institute of Physics Inc.
T2 - 2021 International Conference on Bioengineering and Technology, IConBET2021
Y2 - 24 May 2022 through 25 May 2022
ER -