Journal of the Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회논문지)

The Korean Institute of Electrical and Electronic Material Engineers (한국전기전자재료학회)
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Effect of Compaction Methods on the Microstructures and Mechanical Properties of α-Alumina

α-알루미나의 미세구조 및 기계적 성질에 미치는 성형방법의 영향

  • 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)
  • 백정현 (한국세라믹기술원 나노소재공정센터) ;
  • 이성갑 (경상대학교 공학원 나노신소재융합공학과) ;
  • 전명표 (한국세라믹기술원 나노소재공정센터)
  • Received : 2019.03.22
  • Accepted : 2019.05.09
  • Published : 2019.07.01
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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

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Fig. 1. Fabrication process of α-Al2O3 ceramics.

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Fig. 2. X-ray diffraction pattern of α-Alumina powder.

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Fig. 3. The scanning electron microscopy (SEM) ×10,000 images of α-Alumina powders.

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Fig. 4. Particle size distribution of alumina powder were taken by the particle size analyzer (PSA).

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Fig. 5. Variations of their shirinkage rate as a function of sintering temperature for the disk samples which were pressed uni-axially and isostatically, respectively.

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Fig. 6. The scanning electron microscopy (SEM) ×10,000 images of samples uniaxial pressed and sintered at (a) 1,200℃, (b) 1,300℃, (c) 1,400℃, (d) 1,450℃, (e) 1,500℃, and (f) 1,600℃ and isostatical pressed and sintered at (g) 1,200℃, (h) 1,300℃, (i) 1,400℃, (j) 1,450℃, (k) 1,500℃, and (l) 1,600℃ for 2 h.

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Fig. 7. Variations of their sintered (a) densities, and (b) porosity as a function of sintering temperature for the disk samples which were pressed uniaxially and isostatically, respectively.

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Fig. 9. Indentations of vicker’s hardness tester of samples uniaxially pressed and sintered at (a) 1,200℃, (a) 1,300℃, (c) 1,400℃, (d) 1,450℃, (e) 1,500℃, and (f) 1,600℃ and uniaxially pressed and sintered at (g) 1,200℃, (g) 1,300℃, (g) 1,400℃, (g) 1,450℃, (g) 1,500℃, and (g) 1,600℃.

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Fig. 10. Realationship between grain size and vickers hardness of Al2O3 sintered at various temperatures which were pressed uniaxially and isostatically, respectively.

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Fig. 8. Variations of their (a) vickers hardness and (b) fracture toughness as a function of sintering temperature for the disk samples which were pressed uni-axially and isostatically, respectively.

Table 1. Variations of their green density, and sintered density and porosity as a function of sintering temperature for the disk samples which were pressed uniaxially and isostatically, respectively.

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