Mechanical properties and electrical conductivity of alumina/MWCNT and alumina/zirconia/MWCNT composites
Source abstract
Abstract
Abstract The alumina/multi-wall carbon nanotubes (MWCNT) and Al2O3/ZrO2/MWCNT composites with up to 2 vol% of MWCNT were prepared and characterized. The homogeneity of the composite powders was ensured by application of freeze drying and granulation as a method for drying of stabilized aqueous suspensions. The soft spherical granules were hot pressed at 1500 °C for 2 h under uniaxial mechanical pressure of 30 MPa to prepare dense composites. The mechanical properties, namely Vickers hardness (HV1) and fracture toughness (K1c), together with DC electrical conductivity (σ) were measured, and compared with the pure alumina reference prepared under similar conditions. Incorporation of 1 vol% of the MWCNT into the alumina, and alumina/zirconia matrices (composites AC and AZC, respectively) lead to the increase of fracture toughness by 8% and 35%, in comparison to the monolithic alumina reference. The electrical conductivity increased from 10−12 S/m in the pure alumina to 2.7×10−1 S/m in the composites containing 2 vol% of the MWCNT.
Source: openaire · Quality: candidate unverified · Source record ↗
Research context
OpenAlex topics: Advanced ceramic materials synthesis · Thermal properties of materials · Carbon Nanotubes in Composites
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (37)
Show source-provided references
1. Helical microtubules of graphitic carbon10.1038/354056a0 ↗
2. Exceptionally high Young’s modulus observed for individual carbon nanotubes10.1038/381678a0 ↗
3. Tensile loading of ropes of single wall carbon nanotubes and their mechanical properties10.1103/PhysRevLett.84.5552 ↗
4. Growing carbon nanotubes10.1016/S1369-7021(04)00446-8 ↗
5. Carbon nanotube composites for thermal management10.1063/1.1469696 ↗
6. Mechanical and electrical properties of multiwalled CNT-alumina nanocomposites prepared by a sequential two-step processing of ultrasonic spray pyrolysis and spark plasma sintering10.1111/j.1551-2916.2011.04689.x ↗
7. Electrical properties of nanoceramics reinforced with ropes of single-walled carbon nanotubes10.1063/1.1600511 ↗
8. Preparation and microstructure of multi-wall carbon nanotubes-toughened Al2O3 composite10.1111/j.1551-2916.2005.00774.x ↗
9. Colloidal processing of carbon nanotube/alumina composites10.1021/cm020736q ↗
10. Effect of sintering temperature on a single-wall carbon nanotube-toughened alumina-based nanocomposite10.1016/j.scriptamat.2007.02.007 ↗
11. Processing of carbon nanotube reinforced silicon nitride composites by spark plasma sintering10.1016/j.compscitech.2004.10.006 ↗
12. Carbon nanotube toughened aluminium oxide nanocomposite10.1016/j.jeurceramsoc.2009.09.032 ↗
13. In situ growth of carbon nanotubes in alumina–zirconia nanocomposite matrix prepared by solution combustion method10.1016/j.ceramint.2011.12.033 ↗
14. Tribological properties of hot-pressed alumina–CNT composites10.1016/S0043-1648(03)00216-3 ↗
15. The sintering and grain growth behaviour of ceramic–carbon nanotube nanocomposites10.1016/j.compscitech.2010.02.010 ↗
16. Sinter and hot isostatic pressing (HIP) of multi-wall carbon nanotubes (MWCNTs) reinforced ZTA nanocomposite: microstructure and fracture toughness10.1016/j.ijrmhm.2009.12.007 ↗
17. Microstructure and physicomechanical properties of pressureless sintered multiwalled carbon nanotube/alumina nanocomposites10.1016/j.ceramint.2011.07.023 ↗
18. Correlation between microstructure and mechanical properties of Al2O3/ZrO2 nanocomposites10.1016/j.ceramint.2008.02.002 ↗
19. Zirconia-toughened alumina (ZTA) ceramics10.1007/BF02385721 ↗
20. Particle interactions in zirconia-toughened alumina10.1111/j.1151-2916.1989.tb09720.x ↗
21. Purification of single-wall carbon nanotubes by ultrasonically assisted filtration10.1016/S0009-2614(97)01265-7 ↗
22. On the stacking behavior of functionalized single-wall carbon nanotubes10.1021/jp014019f ↗
23. Alumina/MWCNTs composites by aqueous slip casting and pressureless sintering10.1016/j.ceramint.2013.01.087 ↗
24. Average grain size in polycrystalline ceramics10.1111/j.1151-2916.1969.tb11975.x ↗
25. Indentation fracture of WC–Co cermets10.1007/BF00555296 ↗
26. Measurement of sheet resistivities with the four-point probe10.1002/j.1538-7305.1958.tb03883.x ↗
27. The influence of ageing on consolidation and sinterability of a sub-micron alumina powder10.1016/j.powtec.2011.08.034 ↗
28. Reinforcement of alumina matrix with multi-walled carbon nanotubes10.1016/j.ceramint.2004.10.002 ↗
29. Single-wall carbon nanotubes as attractive toughening agents in alumina-based nanocomposites10.1038/nmat793 ↗
30. A new structure for multi-walled carbon nanotubes reinforced alumina nanocomposite with high strength and toughness10.1016/j.matlet.2007.06.025 ↗
31. Fracture toughness of alumina and ZTA ceramics: microstructural coarsening effects10.1016/S0924-0136(03)00396-0 ↗
32. In situ carbon nanotube reinforcements in a plasma-sprayed aluminum oxide nanocomposite coating10.1016/j.actamat.2007.10.038 ↗
33. The production of advanced fine-grained alumina by carbon nanotube addition10.1016/j.jeurceramsoc.2011.07.011 ↗
34. Mechanisms of toughening partially stabilized zirconia (PSZ)10.1111/j.1151-2916.1977.tb15509.x ↗
35. Fracture toughness enhancement for alumina systems: a review10.1111/j.1744-7402.2008.02224.x ↗
36. Tribological properties of nanoscale alumina–zirconia composites10.1016/S0043-1648(98)00403-7 ↗
37. Percolative mechanism of sliding wear in alumina/zirconia composites10.1016/j.jeurceramsoc.2005.05.008 ↗