Anomalous densification behavior of Al2O3–Cr2O3 system

Nath, Mithun; Kumar, Pawan; Maldhure, Atul V.; Sinhamahapatra, Somnath; Dana, Kausik; Ghosh, Arup; Tripathi, Himansu Sekhar

doi:10.1016/j.matchar.2015.11.005

Cited by 26 publications

(20 citation statements)

References 23 publications

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“…It has been shown that all peaks were matched of α-Al 2 O 3 with small shifting, corresponding to JCPDS card No 43-1484. As known, the addition of Cr 2 O 3 in the Al 2 O 3 , the distances between a-Al 2 O 3 planes increase and there is a shift of all the peaks conforming to the pure alumina which indicates the formation of solid solution [3][4][5].…”

Section: X-ray Diffraction (Xrd)mentioning

confidence: 81%

“…Al 2 O 3 sesquioxides having the same corundum crystal structure ( system with the Al 3+ and Cr thirds of the octahedral interstitial sites). At high temperature, they form complete substitutional solid solution without consistence over the entire composition range [3,5]. Al Cr 2 O 3 system is great interest refractoriness and chemical stability at high temperatures.…”

Section: Fabrication Of Carbon Nanotube Reinforced Al 2 Nanocompositementioning

confidence: 99%

“…Recent researches are incorporation of carbon nanotubes (CNTs) i ceramic matrix composites in order to improve same corundum crystal structure (hexagonal and Cr 3+ ions taking two thirds of the octahedral interstitial sites). At high temperature, they form complete substitutional consistence of any eutectic over the entire composition range [3,5]. Al 2 O 3system is great interest due to of its high fractoriness and chemical stability at high temperatures.…”

Section: Fabrication Of Carbon Nanotube Reinforced Al 2 Nanocompositementioning

confidence: 99%

“…Al 2 O 3system is great interest due to of its high fractoriness and chemical stability at high temperatures. Also, this system has superior mechanical properties and good thermal shock ensification behavior, strength, modulus of rupture and hardness exhibited dependency reliance on each other [5,6]. However, low fracture toughness of ceramics still cannot match the command of many practical fields, which greatly limits its applications [7].…”

Section: Fabrication Of Carbon Nanotube Reinforced Al 2 Nanocompositementioning

confidence: 99%

“…5 also, it has been shown that the nanocomposite samples from Al 2 O 3 -10 wt% Cr 2 O 3 having higher values of apparent density than Al 2 O 3 -20 wt% Cr 2 O 3 , at different carbon nanotube content. This is attributed to increasing the Cr 2 O 3 content that has higher specific gravity of (5.22) as compared to Al 2 O 3 (3.94) [5].…”

Section: Fig 5 Reveals the Apparent Density Versusmentioning

confidence: 99%

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Fabrication of Carbon Nanotube Reinforced Al2O3/Cr2O3 Nanocomposites by Coprecipitation Process

Jaber¹

2017

alkej

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In this research, the effect of multi-walled carbon nanotubes (MWCNTs) on the alumina/chromia (Al2O3/Cr2O3) nanocomposites has been investigated. Al2O3/Cr2O3-MWCNTs nanocomposites with variable contents of Cr2O3 and MWCNTs were fabricated using coprecipitation process and followed by spark plasma sintering. XRD analysis revealed a good crystallinity of sintered nanocomposites samples and there was only one phase presence of Al2O3-Cr2O3 solid solution. Density, Vickers microhardness, fracture toughness and fracture strength have been measured in the sintered samples. The results show that the relative density, microhardness and fracture strength of nanocomposites are significantly improved at low contents of Cr2O3 and MWCNTs. The increase of MWCNT’s content in the nanocomposites has adversely affected due to increasing the tangle and interaction of MWCNTs with each other, which leads to agglomeration in the nanocomposites. Increasing of Cr2O3 content in nanocomposites increases formation of Al2O3-Cr2O3 solid solution that actually requires the high sintering temperature to achieve good densification. The fracture toughness of Al2O3/Cr2O3-MWCNTs nanocomposites was enhanced by increasing the carbon nanotube content.

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Section: X-ray Diffraction (Xrd)mentioning

confidence: 81%

Section: Fabrication Of Carbon Nanotube Reinforced Al 2 Nanocompositementioning

confidence: 99%

Section: Fabrication Of Carbon Nanotube Reinforced Al 2 Nanocompositementioning

confidence: 99%