Graphene Covered Alumina Nanofibers as Toughening Agent in Alumina Ceramics

2014 ◽  
Vol 88 ◽  
pp. 49-53 ◽  
Author(s):  
Irina Hussainova ◽  
Maria Drozdova ◽  
Marina Aghayan ◽  
Roman Ivanov ◽  
Domingo Pérez-Coll
Keyword(s):  
High Performance ◽  
Gas Flow ◽  
Fiber Surface ◽  
Alumina Ceramics ◽  
Ceramic Fracture ◽  
Mechanical And Electrical Properties ◽  
Alumina Nanofibers ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Monolithic Alumina

Graphene is a promising component for next-generation high-performance structural and multifunctional composite materials. Graphene deposited onto nanofibers of high aspect ratio can serve as reinforcement agent for improving ceramic fracture toughness and electroconductivity. It was found that quality and quantity of graphene sheets on the fiber surface essentially depends on the pyrolysis of carbon source conditions such as gas flow, duration, temperature and the composition of the gas mixture. The alumina/graphene composites of 10 and 15 wt% of nanofibers covered by graphene were produced by spark plasma sintering (SPS) at 1380 °C. Both composites show improvement in mechanical and electrical properties as compared to the monolithic alumina. The main advantage of the graphene growth on the fibers surface is a lack of complicated step of constituents mixing. Graphene platelets are believed to act as toughening agents prevailing crack propagation under loading.

scholarly journals Thermal Transport and Thermoelectric Effect in Composites of Alumina and Graphene-Augmented Alumina Nanofibers

Materials ◽  
2021 ◽  
Vol 14 (9) ◽  
pp. 2242
Author(s):  
Ali Saffar Shamshirgar ◽  
Manuel Belmonte ◽  
Girish C. Tewari ◽  
Rocío E. Rojas Hernández ◽  
Jani Seitsonen ◽  
...  
Keyword(s):  
Thermal Conductivity ◽  
Figure Of Merit ◽  
Filler Content ◽  
Alumina Ceramics ◽  
Thermoelectric Figure ◽  
Seebeck Coefficients ◽  
Alumina Nanofibers ◽  
Plasma Sintering ◽  
Carbon Structures ◽  
Spark Plasma

The remarkable tunability of 2D carbon structures combined with their non-toxicity renders them interesting candidates for thermoelectric applications. Despite some limitations related to their high thermal conductivity and low Seebeck coefficients, several other unique properties of the graphene-like structures could out-weight these weaknesses in some applications. In this study, hybrid structures of alumina ceramics and graphene encapsulated alumina nanofibers are processed by spark plasma sintering to exploit advantages of thermoelectric properties of graphene and high stiffness of alumina. The paper focuses on thermal and electronic transport properties of the systems with varying content of nanofillers (1–25 wt.%) and demonstrates an increase of the Seebeck coefficient and a reduction of the thermal conductivity with an increase in filler content. As a result, the highest thermoelectric figure of merit is achieved in a sample with 25 wt.% of the fillers corresponding to ~3 wt.% of graphene content. The graphene encapsulated nanofibrous fillers, thus, show promising potential for thermoelectric material designs by tuning their properties via carrier density modification and Fermi engineering through doping.

Improved performance of SrFe12O19 bulk magnets through bottom-up nanostructuring

Nanoscale ◽  
2016 ◽  
Vol 8 (5) ◽  
pp. 2857-2866 ◽  
Author(s):  
Matilde Saura-Múzquiz ◽  
Cecilia Granados-Miralles ◽  
Marian Stingaciu ◽  
Espen Drath Bøjesen ◽  
Qiang Li ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
High Performance ◽  
Single Domain ◽  
Bottom Up ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Improved Performance ◽  
Supercritical Synthesis

High-performance hexaferrite magnets of aligned single-domain nanoplatelets are obtained by supercritical synthesis and compaction through Spark Plasma Sintering.

scholarly journals Enhancing copper infiltration into alumina using spark plasma sintering to achieve high performance Al2O3/Cu composites

2018 ◽  
Vol 44 (1) ◽  
pp. 57-64 ◽  
Author(s):  
Yingge Shi ◽  
Wenge Chen ◽  
Longlong Dong ◽  
Hanyan Li ◽  
Yongqing Fu
Keyword(s):  
Spark Plasma Sintering ◽  
High Performance ◽  
Plasma Sintering ◽  
Spark Plasma

High-performance Ag0.8Pb18+xSbTe20 thermoelectric bulk materials fabricated by mechanical alloying and spark plasma sintering

2006 ◽  
Vol 88 (9) ◽  
pp. 092104 ◽  
Author(s):  
Heng Wang ◽  
Jing-Feng Li ◽  
Ce-Wen Nan ◽  
Min Zhou ◽  
Weishu Liu ◽  
...  
Keyword(s):  
Mechanical Alloying ◽  
Spark Plasma Sintering ◽  
High Performance ◽  
Bulk Materials ◽  
Plasma Sintering ◽  
Spark Plasma

scholarly journals Microstructure Evolution of Mg96.9Gd2.7Zn0.4 Alloy Containing Multiple Phases Prepared by Spark Plasma Sintering Method

Metals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 1355
Author(s):  
Zhiyong Xue ◽  
Xiuzhu Han ◽  
Wenbo Luo ◽  
Zhiyong Zhou ◽  
Zhizhong Cheng ◽  
...  
Keyword(s):  
Spark Plasma Sintering ◽  
Rapid Solidification ◽  
High Performance ◽  
Aging Treatment ◽  
Lpso Phase ◽  
Β Phase ◽  
Plasma Sintering ◽  
Spark Plasma ◽  
Molten Liquid ◽  
Sintering Method

The synergic strengthening of multiple phases is an essential way to achieve high-performance Mg alloys. Herein, Mg-Gd-Zn alloy containing four phases was prepared by rapid solidification (RS) ribbons and spark plasma sintering (SPS). The microstructure of the alloy consisted of α-Mg, nanosized β1 phase particles, lamellar long period stacking ordered (LPSO) phase, and β′ phase precipitates. The microstructural evolution was also investigated. The results show that the metastable β1 phase was formed in the as-cast solidification through rapid solidification, because both Zn atoms and the short holding-time at molten liquid facilitated the formation of the β1 phase. The β1 phase grew from 35.6 to 154 nm during the sintering process. Meanwhile, the fine lamellar LPSO phase was simultaneously formed after the Zn-Gd clusters were generated from the supersaturated solid solution, and the width of the LPSO phase was only in the range of 2–30 nm. The third strengthening phase, the metastable β′ phase, was obtained by aging treatment. The results of hardness testing implied that the hardness of the alloy containing the aforementioned three nanosized strengthening phases significantly improved about 47% to 126 HV compared with that of the as-cast ingot.

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