Preparation and Mechanical Properties of Graphene Nanosheet Reinforced Alumina Composites

2014 ◽  
Vol 17 (1) ◽  
pp. 28-35 ◽  
Author(s):  
Xia Liu ◽  
Yu-Chi Fan ◽  
Jian-Lin Li ◽  
Lian-Jun Wang ◽  
Wan Jiang
Keyword(s):  
Mechanical Properties ◽  
Graphene Nanosheet ◽  
Alumina Composites

Mechanical Properties of Zirconia Toughened Alumina Composites with TZP Partially Nanostructured Sintered by Liquid Fase

2008 ◽  
Vol 591-593 ◽  
pp. 436-440
Author(s):  
João Marcos K. Assis ◽  
Francisco Piorino Neto ◽  
Francisco Cristóvão Lourenço de Melo ◽  
Maria do Carmo de Andrade Nono
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Weibull Modulus ◽  
Bending Test ◽  
Sintering Aid ◽  
Zirconia Composites ◽  
Alumina Composites ◽  
Grain Size And Shape ◽  
Zirconia Toughened Alumina ◽  
Zirconia Powders

A comparative study between alumina added niobia ceramics and two alumina zirconia composites from nanostructured TZP (7% and 14% weight) was made. On this composites the zirconia were yttria stabilized and the alumina were submicron structured. As sintering aid a mixture of magnesia, niobia and talc were used on all samples. The sintering was performed at 1450 oC during 60 minutes. The characteristic grain size and shape of an alumina and zirconia powders, aggregates and agglomerates were characterized. The sintering ceramics were evaluated through hardness, fracture toughness and 4 point bending test. Weibull statistic was applied on the flexural results. Although the fracture toughness result from ZTA were lower, and seems to be affected by the liquid fase, the hardness and Weibull modulus were higher than alumina niobia. The grains size and the homogeneity of its distributions on the microstructure of this ceramics was correlated to these higher values. The results from these alumina zirconia composites showed a potential to apply as a ballistic armor material.

Preparation of Graphene Nanosheet/Alumina Composites

2013 ◽  
Vol 745-746 ◽  
pp. 534-538 ◽  
Author(s):  
Xia Liu ◽  
Yu Chi Fan ◽  
Qian Feng ◽  
Lian Jun Wang ◽  
Wan Jiang
Keyword(s):  
Low Temperature ◽  
Composite Powder ◽  
Expanded Graphite ◽  
Structure And Properties ◽  
Composite Powders ◽  
Graphene Nanosheet ◽  
Residual Solvent ◽  
Grain Sizes ◽  
Alumina Composites ◽  
Mixed Gases

Graphene nanosheet (GNS)/ Al2O3 composite powder with homogeneously distributed GNSs has been fabricated from wet ball milled expanded graphite and Al2O3, and then followed by the rotary evaporator at relatively low temperature to dry the mixture and the residual solvent was removed in atmosphere-vacuum pipe-type furnace accessing mixed gases of Argon and Hydrogen at 600 for 6h. During the process, homogeneously dispersed and mixed GNS/ Al2O3 composite powders with quite few damage of GNSs structure and properties have been obtained. The microstructures and grain sizes of GNS/ Al2O3 composite powders have been investigated. The results showed that the addition of GNSs had diminished the size of Al2O3 particles and also the as-prepared GNSs/ Al2O3 composite powders can be dispersed and mixed more homogeneously remarkably with the presence of GNSs.

Co-milling-assisted exfoliated graphite nanoplatelets filler introduction in polyethylene and alumina composites

2018 ◽  
Vol 53 (13) ◽  
pp. 1815-1826
Author(s):  
Sheng Cai Tan ◽  
Jimmy KW Chan ◽  
Kian Ping Loh
Keyword(s):  
Mechanical Properties ◽  
Tensile Strength ◽  
Composite Materials ◽  
Exfoliated Graphite ◽  
Flexural Properties ◽  
Graphite Nanoplatelets ◽  
Alumina Composites ◽  
Exfoliated Graphite Nanoplatelets ◽  
Polyethylene Composites

This paper aims to investigate the effect of co-milling-assisted exfoliation of graphite into polyethylene and alumina matrices on the mechanical properties of the composites. Tensile mechanical properties of composite materials based on polyethylene reinforced with graphite and graphite-derived fillers at 0–0.75 wt% loading were investigated, while hardness and flexural properties of alumina composites with 0.25 wt% loading of the same additives were assessed. Exfoliated graphite, applied at 0.25–0.75 wt% in pre-exfoliated form or in a co-milling-assisted fashion, has been demonstrated to be effective in enhancing the tensile strength of polyethylene composites. Similar enhancement in hardness and flexural properties was observed in alumina composites with 0.25 wt% loading of the exfoliated graphite. Co-milling-assisted exfoliated graphite nanoplatelets additive introduction has been found to effect a more desirable mechanical properties enhancement in the composites investigated in this study.

Effect of small amount of alumina on structure, wear and mechanical properties of 3Y-TZP ceramics

2014 ◽  
Vol 11 (1) ◽  
pp. 9-16 ◽  
Author(s):  
Igor Danilenko ◽  
Serhii Prokhorenko ◽  
Tetyana Konstantinova ◽  
Leonid Ahkozov ◽  
Valerii Burkhovetski ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Fracture Toughness ◽  
Composite Structures ◽  
Tribological Behavior ◽  
Ceramic Composites ◽  
Synthesis Methods ◽  
Zirconia Ceramics ◽  
Alumina Composites ◽  
Co Precipitation ◽  
Metallic Parts

The use of ceramic instead of metallic parts in devices that operate in aggressive conditions increases the service life of machines and equipment for chemical, metallurgical and other industries. The wear resistant zirconia/alumina composites were sintered from nanopowders obtained by co-precipitation technique. In the case of addition of 1wt% of alumina in zirconia ceramics the wear resistance increased by approximately 30%.The formation of complex multilevel composite structures, such as Al3+ ion segregation on zirconia grain boundaries and intracrystalline alumina inclusions in zirconia grains, increased the fracture toughness values of composites obtained from co-precipitated nanopowders and consequently decreased the volume loss of ceramic material.In this study, we investigated the effect of nanopowders synthesis methods and alumina concentration on composite structure, fracture toughness and tribological behavior of 3Y-TZP/alumina ceramic composites and searched correlation between structures and mechanical properties.

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