Microstructure and mechanical properties of Al2O3 matrix nanocomposites produced by solid state precipitation

Mukhopadhyay, Amartya; Todd, Richard I.

doi:10.1016/j.jeurceramsoc.2009.12.007

Cited by 26 publications

(25 citation statements)

References 24 publications

(32 reference statements)

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“…In general, it is necessary to start from a nanosized second phase that would react with the matrix particles during sintering process. Al 2 O 3 -FeAl 2 O 4 nanocomposites, with improved wear resistance as compared to that of single-phase alumina with similar grain sizes, have been produced by solidstate precipitation during the aging of Al 2 O 3 -10 wt% Fe 2 O 3 solid solutions in reducing atmosphere (Mukhopadhyay & Todd, 2010a;Mukhopadhyay & Todd, 2011). The microstructure of the materials was further improved by doping with 250 ppm Y 2 O 3 (Mukhopadhyay & Todd, 2010b.…”

Section: In Situ-formed Nanocompositesmentioning

confidence: 99%

Processing of Alumina and Corresponding Composites

Baudı́n

2014

Comprehensive Hard Materials

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Section: In Situ-formed Nanocompositesmentioning

confidence: 99%

Processing of Alumina and Corresponding Composites

Baudı́n

2014

Comprehensive Hard Materials

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“…The core of the material is made up of the spinel FeAl 2 O 4 and Al 2 O 3 (and the surface may contain FeAl 2 O 4 too depending on the experimental conditions). Other authors [7] also reported the formation of Fe-FeAl 2 O 4 -Al 2 O 3 nanocomposites by aging sintered solid solutions in N 2 -H 2 gas atmosphere. The first aim of this paper is to study the in situ formation of Co-Al 2 O 3 coatings during SPS of CoAl 2 O 4 powders.…”

Section: Introductionmentioning

confidence: 90%

“…Metal-Al 2 O 3 ceramic matrix nanocomposites and nano/ micro hybrid composites could be interesting for tribological applications [1][2][3][4][5][6], although some authors [7] suggested that metal particles may be detrimental and that oxide-Al 2 O 3 composites may be more desirable. The preparation of metalAl 2 O 3 composites usually involves firstly the synthesis of a metal-Al 2 O 3 composite powder and then its consolidation by hot-pressing or Spark Plasma Sintering (SPS).…”

Section: Introductionmentioning

confidence: 99%

Hardness and friction behavior of bulk CoAl2O4 and Co–Al2O3 composite layers formed during Spark Plasma Sintering of CoAl2O4 powders

Pavia

Billon

Weibel

et al. 2012

Ceramics International

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OATAO is an open access repository that collects the work of Toulouse researchers and makes it freely available over the web where possible. powders. The Co particles are precipitated because of a combination of high temperature and low O 2 partial pressure. The precipitation and densification processes hamper each other and thus the way the uniaxial pressure is applied during the sintering cycle is an important parameter to control the microstructure of composite layer and its thickness (about 100 mm) and obtain a dense sample (about 4 g/cm 3 ). The friction coefficient of the CoAl 2 O 3 composites against an Al 2 O 3 ball is lower than that found for an Al 2 O 3 specimen, which could reveal the lubricating role of submicrometer Co particles. However, increasing the load from 5 to 10 N load causes major changes in the friction contact, which are detrimental. Bulk CoAl 2 O 4 was found to have a Vickers microhardness about 15.5 GPa and an average friction coefficient lower than that of an Al 2 O 3 sample.

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“…15 In this paper, the reduction processes were conducted at 600 C, 500 C, and 400 C by using pure hydrogen. appeared, and no peaks of Al 2 O 3 could be detected in the sample reduced at 400 C. Mössbauer (MS) spectra were collected at room temperature to obtain the accurate phase composition.…”

Section: Phase Characterizationmentioning

confidence: 99%

Microstructure and metal–dielectric transition behaviour in a percolative Al2O3–Fe composite via selective reduction

et al. 2013

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Dou, S. (2013). Microstructure and metal-dielectric transition behaviour in a percolative Al2O3-Fe composite via selective reduction. RSC Advances, 3 (48), 26110-26115. Microstructure and metal-dielectric transition behaviour in a percolative Al2O3-Fe composite via selective reduction AbstractThe electromagnetic (EM) medium plays a key role in many areas, such as communications, stealth technology, etc. Different EM properties are required for different applications. In this paper, we have obtained tunable EM properties in an Al2O3-Fe composite via selective reduction. By adjusting the content of one functional component, the composite shows totally different EM properties, in accordance with the predictions of effective medium theory. Hybrid EM behaviour is obtained near the percolation threshold, which has a close relationship with its microstructure.

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Microstructure and mechanical properties of Al2O3 matrix nanocomposites produced by solid state precipitation

Cited by 26 publications

References 24 publications

Processing of Alumina and Corresponding Composites

Processing of Alumina and Corresponding Composites

Hardness and friction behavior of bulk CoAl2O4 and Co–Al2O3 composite layers formed during Spark Plasma Sintering of CoAl2O4 powders

Microstructure and metal–dielectric transition behaviour in a percolative Al2O3–Fe composite via selective reduction

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