Improvement of flexure strength and fracture toughness in alumina matrix composites reinforced with carbon nanotubes

2009 ◽  
Vol 517 (1-2) ◽  
pp. 293-299 ◽  
Author(s):  
Sung Wan Kim ◽  
Won Sub Chung ◽  
Kee-Sun Sohn ◽  
Chang-Young Son ◽  
Sunghak Lee
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Flexure Strength

scholarly journals Effects of Sintering Additive on Mechanical Properties of Alumina Matrix Composites Reinforced with Carbon Nanotubes

2010 ◽  
Vol 4 (3) ◽  
pp. 460-469 ◽  
Author(s):  
Go YAMAMOTO ◽  
Mamoru OMORI ◽  
Toshiyuki HASHIDA ◽  
Hisamichi KIMURA ◽  
Toshiyuki TAKAGI
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Sintering Additive

Investigation on the Reinforcement of Multi-Walled Carbon Nanotubes on Alumina Matrix

2006 ◽  
Vol 51 ◽  
pp. 64-67
Author(s):  
Jing Sun ◽  
Lian Gao
Keyword(s):  
Carbon Nanotubes ◽  
Bending Strength ◽  
Weight Percent ◽  
Processing Route ◽  
Matrix Composites ◽  
Alumina Matrix ◽  
Multi Walled Carbon Nanotubes ◽  
Alumina Composites ◽  
Walled Carbon Nanotubes ◽  
Monolithic Alumina

In this paper, a colloidal processing route was adopted to disperse multi-walled carbon nanotubes (MWNTs) into alumina powders homogenously. Alumina matrix composites containing 0.1 to 2 weight percent of MWNTs were successfully fabricated by pressureless sintering. Also, 1wt% MWNTs-alumina composites were prepared by hot pressing for comparison. It was found that when the sample was sintered at 1450oC, the addition of 1wt% carbon nanotubes led to 10% increase in bending strength compared with monolithic alumina. The reinforcement mechanism was discussed based on the microstructure investigation. The broken nanotubes and pullout of MWNTs at interfaces are efficient in transferring the load from the alumina matrix to the nanotubes, leading to the improvement of the mechanical properties.

Preparation and Mechanical Properties of Carbon Nanotubes Reinforced Alumina Ceramic Composite

2011 ◽  
Vol 239-242 ◽  
pp. 2721-2727 ◽  
Author(s):  
Xi Wang Wu ◽  
Jian Zhong Xiao ◽  
Feng Xia ◽  
Yong Gang Hu ◽  
Zhou Peng
Keyword(s):  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Ceramic Composite ◽  
Hydrogen Atmosphere ◽  
Sem Analysis ◽  
Residual Tensile Stress ◽  
Alumina Matrix ◽  
Dispersion Method ◽  
Disperse Carbon ◽  
Key Issues

How to uniformly disperse carbon nanotubes (CNTs) and densely sinter green body are the key issues to prepare carbon nanotubes reinforced alumina (Al2O3) composite. We prepare CNTs-Al2O3 powder by shearing extruding dispersion method, and then obtain CNTs-Al2O3 composite by hydrogen atmosphere pressureless sintering. 93% of the relative increased fracture toughness can be achieved, when the CNTs content of composite is 1%. Because of Absorbing energy by pulling CNTs out from alumina matrix and refining grain by CNTs bundles sitting along alumina grain, the fracture toughness is improved obviously. By XRD and SEM analysis, the residual tensile stress which is caused by embedding CNTs into alumina matrix also plays an important role for the increase of fracture toughness.

Sintering temperature-microstructure-property relationships of alumina matrix composites with silicon carbide and silica additives

2017 ◽  
Vol 24 (4) ◽  
pp. 495-500 ◽  
Author(s):  
Apichart Limpichaipanit ◽  
Sukanda Jiansirisomboon ◽  
Tawee Tunkasiri
Keyword(s):  
Fracture Toughness ◽  
Silicon Carbide ◽  
Grain Size ◽  
Fracture Surface ◽  
Sintering Temperature ◽  
Matrix Composites ◽  
Reaction Sintering ◽  
Alumina Matrix ◽  
Powder Mixtures ◽  
Ceramic Samples

AbstractAlumina-based composites were fabricated by reaction sintering from two different sintering powder mixtures: alumina with silica (SiO2) and alumina with silicon carbide (SiC; to allow oxidation to form SiO2). After sintering, SiO2 underwent complete reaction to form alumina/mullite composites. In terms of microstructure, the density and grain size of ceramic samples were investigated. The density of the composites prepared by alumina and SiC was lower than those of alumina and the composites prepared by alumina and SiO2. The grain size increased as the sintering temperature increased. In terms of mechanical properties, fracture surfaces, hardness, and fracture toughness were investigated. It was found that the fracture surface of alumina was rather intergranular, whereas the fracture surface of the composites was more transgranular. The hardness of the composites was higher than that of alumina at the same sintering temperature. However, the fracture toughness of the composites was not significantly different compared to that of alumina.

scholarly journals Improvement of Wear Resistance in Alumina Matrix Composites Reinforced with Carbon Nanotubes

2009 ◽  
Vol 41 (2) ◽  
pp. 380-388 ◽  
Author(s):  
Sung Wan Kim ◽  
Won Sub Chung ◽  
Kee-Sun Sohn ◽  
Chang-Young Son ◽  
Sunghak Lee
Keyword(s):  
Carbon Nanotubes ◽  
Wear Resistance ◽  
Matrix Composites ◽  
Alumina Matrix

Dispersion of Carbon Nanotubes in Alumina Using a Novel Mixing Technique and Spark Plasma Sintering of the Nanocomposites with Improved Fracture Toughness

2014 ◽  
Vol 89 ◽  
pp. 76-81 ◽  
Author(s):  
Nabi Bakhsh ◽  
Fazal Ahmad Khalid ◽  
Abbas Saeed Hakeem ◽  
Tahar Laoui
Keyword(s):  
Mechanical Properties ◽  
Carbon Nanotubes ◽  
Fracture Toughness ◽  
Spark Plasma Sintering ◽  
Alumina Powder ◽  
Alumina Matrix ◽  
Pull Out ◽  
Plasma Sintering ◽  
Structural Applications ◽  
Spark Plasma

The present study emphasizes on the fabrication of carbon nanotubes (CNTs) reinforced alumina nanocomposites for structural applications. A new technique for the mixing and dispersion of CNTs in alumina powder was employed. Spark plasma sintering (SPS) technique was used for the fabrication of nanocomposites with varying amounts of as-received CNTs (1, 2 and 3 weight %) in alumina matrix. Densification behavior, hardness and fracture toughness of the nanocomposites were studied. A comparison of mechanical properties of the desired nanocomposites was presented. An improvement in fracture toughness of approximately 14% at 1 wt% CNT-alumina nanocomposite over monolithic alumina compacts was observed due to better dispersion of CNTs in alumina matrix that ultimately helped in grain growth suppression to provide finer grain in the nanocomposites. The fractured surfaces also revealed the presence of CNTs bridging and pull out that aided in the improvement of mechanical properties. The synthesized samples were characterized using field emission scanning electron microscopy, X-ray diffraction, Raman spectroscopy, densification, Vickers hardness testing and fracture toughness measurements.

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