Fracture behaviour of α-Al2O3 ceramics reinforced with a mixture of single-wall and multi-wall carbon nanotubes

Research on the interface properties and strengthening–toughening mechanism of nanocarbon-toughened ceramic matrix composites

“…Therefore, for the composites people just use energy dissipation (i.e., the integral of stress-strain curves) to define the toughness. The common methods used for the evaluation of the resulting composite materials have been tabulated (see Table 1) [23][24][25][26][27][28][29][30]. The foregoing are critical factors that affect the properties of nanocarbonstrengthened and-toughened ceramic matrix composites.…”

An Overview on the Improvement of Mechanical Properties of Ceramics Nanocomposites

“…Despite these positive results, the alumina composites with CNTs addition have not been sufficiently documented and recently some contrasting results came up. For example, Aguilar-Elguézabal and Bocanegra-Bernal [48] studied the fracture behaviour of alumina ceramic reinforced with a mixture of 0.05 wt% MWCNTs + 0.05 wt% SWCNTs. Although the small amounts of CNTs added to the alumina matrix, the results showed a general decrease in Vickers hardness and fracture toughness for these samples compared to monolithic alumina matrix ( Figure 6).…”

“…Although the small amounts of CNTs added to the alumina matrix, the results showed a general decrease in Vickers hardness and fracture toughness for these samples compared to monolithic alumina matrix ( Figure 6). The hardness and fracture toughness of the CNCs with different types of Journal Figure 6: Variation of (a) Vickers hardness and (b) fracture toughness with relative density for various nanocomposites [48].…”

Effect of Single Walled Carbon Nanotube Addition to thePhysical Properties of Monolithic Alumina

“…Al2O3 is a well-known ceramic because of its exceptional properties which makes it suitable for wide range of application [1][2][3][4][5][6][7][8][9]. Al2O3 has magnificent hardness around [15][16][17][18][19][20][21][22], good flexibility [11] high melting point where the value is 2000°C [12] and also has great wear resistance material with high electrical resistivity and corrosion resistance [10]. Al2O3 suitable for cutting tool application because it more stable when operating at high temperature condition, which it resistant to chemical reaction when operated at high working temperature [13].…”

“…Types of CNTs can be categorized into two classes, which are Single-Ahmad Zahirani Ahmad Azhar et al, 2018 Walled Carbon Nanotubes (SWCNT) and Multi-Walled Carbon Nanotubes (MWCNTs). In this study, SWCNT is preferred because are more malleable than MWCNT and also capable of generally self-assemble into bundles as in order to minimize surface energy [18]. The SWCNT are described by strongly bonded by covalent bond, unique one-dimensional (1D) structure and also nanometer size which give astonishing properties, such as magnificent tensile strength more tha 100 GPa [17] good resilience,Young Modulus of up to 1 TPa [19], great electrical conductivity [20] and excellent thermal conductivity, almost 3500 Wm -1 K -1 with length and diameter of 2.6 μm 1.7 nm, repectively [21].…”