Fabrication of transparent MgAl2O4 from commercial nanopowders by hot-pressing without sintering additive

Zhu, Linlin; Park, Young-Jo; Gan, Lin; Go, Shin-Il; Kim, Ha Neul; Kim, Jin-Myung; Ko, Jae‐Woong

doi:10.1016/j.matlet.2018.02.010

Cited by 29 publications

(10 citation statements)

References 14 publications

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“…Recently, with the continuous innovation of sintering technology, increasing numbers of different sintering techniques have been used to prepare MgAl 2 O 4 ceramics, including: spark plasma sintering [16], pressure assisted microwave sintering [17], pressureless sintering [13], reactive sintering followed by HIP [5], dilatometry [18], and the most advanced hot pressing (HP) [19]. In particular, HP has been recognized as an advanced method for ceramic fabrication.…”

Section: Introductionmentioning

confidence: 99%

Characterization of MgAl2O4 sintered ceramics

et al. 2019

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Single phase MgAl 2 O 4 was made from a one-to-one molar ratio of MgO and Al 2 O 3 powders mixed using ball-milling. Mixtures of MgO and Al 2 O 3 were subsequently treated in planetary ball mill for 30, 60, 90 and 120 minutes in air. The aim of this study was to examine phase composition, microstructure, and densification behavior of sintered specimens. After sintering in dilatometer at 1500 °C, the powder was converted to single phase MgAl 2 O 4. The results show that mechanical activation improved the densification behavior of MgAl 2 O 4 sintered specimens, and it reduced the onset temperature for sintering by approx. 100 o C. Based on dilatometer data, powders were subsequently densified at 1450 o C by hot pressing. Almost аll specimens exhibited full density, while sample activated for 30 minutes showed the fastest densification rate.

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Section: Introductionmentioning

confidence: 99%

Characterization of MgAl2O4 sintered ceramics

et al. 2019

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“…Another approach employs wet ball milling to break up hard agglomerates, but dries the powder before compacting it leaving behind carbon‐based molecules on the surface of the powder . While the application of pressure during sintering can alleviate the need for careful green body formation, powders sintered using Spark Plasma Sintering (SPS), Hot Press sintering, or post sintering Hot Isostatic Pressing often suffer discoloration and/or retain carbon in the final product as a result of the interaction between the ceramic and tooling of the apparatus . In these cases, the powder processing or sintering technique can add contaminants, which can be retained in the dense ceramics and impact the bulk properties.…”

Section: Introductionmentioning

confidence: 99%

“…30,[37][38][39][40][41] While the application of pressure during sintering can alleviate the need for careful green body formation, powders sintered using Spark Plasma Sintering (SPS), Hot Press sintering, or post sintering Hot Isostatic Pressing often suffer discoloration and/or retain carbon in the final product as a result of the interaction between the ceramic and tooling of the apparatus. [42][43][44][45][46] In these cases, the powder processing or sintering technique can add contaminants, which can be retained in the dense ceramics and impact the bulk properties. Therefore, there exists an opportunity to develop a processing route free from additive-based green body formation and carbon-based high pressure sintering.…”

Section: Introductionmentioning

confidence: 99%

Pressureless low temperature sintering of nanocrystalline zirconia ceramics via dry powder processing

et al. 2019

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Pressureless sintering approaches provide a simple avenue to manufacture dense ceramic parts with minimal processing equipment, but current pressureless sintering techniques have yet to demonstrate capabilities of producing dense ceramics while maintaining sub‐50 nm grain sizes. Nanocrystalline yttria stablized zirconia ceramics were process from 4 mol% yttria stablized zirconia (4YSZ) nanopowders with a crystallite size of 7.5 nm using dry cold isostatic pressing (CIP) where powders are dried immediately prior to green compact formation and CIP vacuum bagging. It is shown that CIP pressures >75 000 psi (517 MPa) effectively remove pores larger than 100 nm and that pressureless sintering occurs at reduced temperatures for green densities ≥50%. Though the sintering kinetics are shown to be similar to other zirconia nanopowder sintering studies, the small initial crystallize size and reduced sintering temperature allowed densities as high as 97.2%, while retaining a ceramic grain size at or below 40 nm. Produced nanocrystalline 4YSZ ceramics with a grain size of 30.3 nm and a density of 96.3% had Vicker's hardnesses as high as 14.2 GPa and Vicker's indentation fracture resistance of 3.43 MPa·m, demonstrating that simple processing approaches can be refined to fabricate nanocrystalline ceramics while maintaining high hardness and indentation fracture resistance.

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“…Magnezyum alüminat (MgAl2O4) endüstride en iyi bilenen spinellerdendir [1]. Son yıllarda yüksek mukavemet, sertlik ve yüksek sıcaklıkta kararlılık özellikleri ve bu özelliklerin iyi kombinasyonu nedeniyle magnezyum alüminat (MgAl2O4) seramiklere ilgi artmıştır [2]. Mükemmel fiziksel, kimyasal ve termal özelliklere sahiptirler ve bu özelliklerini yüksek sıcaklıkta da korumaktadırlar.…”

Section: Gi̇ri̇ş (Introduction)unclassified

“…Bu nedenle metalurji sektöründe refrakter uygulamalarında ve diğer yüksek sıcaklık proseslerinde yaygın şekilde kullanılmaktadırlar [3]. Ayrıca, bazı uygulamalarda kataliz desteği olarak, sensör, membran, adsorblayıcı olarak, optik özellikleri sebebiyle saydam seramik olarak kullanılmaktadırlar [1, 2,4]. Magnezyum alüminatın ergime derecesi 2135°C'dir.…”

Section: Gi̇ri̇ş (Introduction)unclassified

The Effect of ZnO Addition on Properties of Magnesium Aluminate Spinel

Canikoğlu

2019

Politeknik Dergisi

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MgO ve Al2O3 karışımının katı hal reaksiyonu sonucunda magnezyum aluminat (MgAl2O4) spinel oluşmaktadır. Bu çalışmada spinel sentezi için başlangıç malzemesi olarak manyezit atığı ve Al2O3 kullanılmıştır. Bu sayede manyezit fabrikasından çıkan atığın değerlendirilmesi amaçlanmıştır. Ayrıca başlangıç karışımına ilave edilen ZnO'in magnezyum alüminat spinelin yoğunlaşması üzerine etkileri incelenmiştir. Manyezit atığı, Al2O3 ve ağ. %1, 2, 3 ve 4 oranlarında ZnO ilavesiyle hazırlanan karışımlar kuru preslenmiş ve sonrasında farklı sıcaklıklarda (1300-1350-1400-1450 ve 1500°C) 1 saat süre ile sinterlenmişlerdir. Üretilen ürünlerin XRD, SEM-EDS analizleri yapılmış, bulk yoğunluk, görünür gözenek ve mikro sertlik değerleri ölçülmüştür. Elde edilen sonuçlara göre magnezyum alüminat üretimi için optimum şartlar belirlenmiştir.

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Fabrication of transparent MgAl2O4 from commercial nanopowders by hot-pressing without sintering additive

Cited by 29 publications

References 14 publications

Characterization of MgAl2O4 sintered ceramics

Characterization of MgAl2O4 sintered ceramics

Pressureless low temperature sintering of nanocrystalline zirconia ceramics via dry powder processing

The Effect of ZnO Addition on Properties of Magnesium Aluminate Spinel

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