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http://dx.doi.org/10.4313/JKEM.2019.32.4.333

Effect of Compaction Methods on the Microstructures and Mechanical Properties of α-Alumina  

Baek, Jeong Hyun (Nano Convergence Materials Center, Korea Institute of Ceramic Engineering & Technology)
Lee, Sung gap (Department of Materials Engineering and Convergence Technology, Engineering Research Institute, Gyeongsang National University)
Chun, Myoung Pyo (Nano Convergence Materials Center, Korea Institute of Ceramic Engineering & Technology)
Publication Information
Journal of the Korean Institute of Electrical and Electronic Material Engineers / v.32, no.4, 2019 , pp. 333-340 More about this Journal
Abstract
The effects of compaction methods on the sintering density, microstructures, and mechanical properties were investigated in ${\alpha}-alumina$ ceramics. ${\alpha}-Alumina$ powders were granulated with a 10% aqueous solution of polyvinyl alcohol (PVA). Uniaxially pressed (UAP) and cold isostatic-pressed (CIP) samples were prepared by pressing uniaxially at a pressure of 1 ton for 1 min, and isostatically at 200 MPa for 15 min, respectively. Subsequently, both types of samples were sintered at $1,200^{\circ}C$, $1,300^{\circ}C$, $1,400^{\circ}C$, $1,450^{\circ}C$, $1,500^{\circ}C$, $1,550^{\circ}C$, and $1,600^{\circ}C$ at a rate of $5^{\circ}C/min$ for 2 h. The CIP samples were better than the UAP samples for all properties measured, such as the sintering density, Vicker's hardness, and toughness. The CIP sample sintered at $1,400^{\circ}C$ showed the maximum Vicker's hardness and toughness; this may be attributed to the competing effects of a decrease in porosity and the growth of grains with increasing sintering temperature.
Keywords
${\alpha}-Alumina$; Uniaxial press; Cold isostatical press; Hardness; Fracture toughness;
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