Reaction hot-pressing of zircon-alumina mixtures

Rupo, E. Di; Gilbart, E.; Carruthers, T. G.; Brook, R. J.

doi:10.1007/bf00772734

Cited by 38 publications

(8 citation statements)

References 6 publications

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“…7 Different processing techniques have been developed to synthesize mullite-zirconia composites such as sol-gel processing, 8,9 co-precipitation 10,11 and reaction sintering. [12][13][14][15][16][17][18] Out of all these routes, reaction sintering is an economical, simple and only process in which natural zircon can be used directly to develop mullite-zirconia composites. In this process, reactions among the starting materials and densification can be accomplished simultaneously in a single heat treatment process.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of mullite–zirconia composites by reaction sintering of zircon flour and sillimanite beach sand

et al. 2015

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Mullite-zirconia composites containing 10-30 wt% zirconia were prepared by reaction sintering of zircon flour, sillimanite beach sand and calcined alumina. Raw materials were attrition milled, shaped into pellets and bars and sintered in the temperature range of 1450-1600 • C with 2 h soaking at peak temperature. Sintered products were analysed in terms of various physical, mechanical and thermo-mechanical properties. The analyses of phases developed and microstructural analyses were carried out by X-ray diffraction (XRD) and scanning electron microscope (SEM), respectively. It was observed that the addition of ZrO 2 up to 20 wt% significantly improves flexural strength and fracture toughness. The transformation of t → m zirconia was found to be the dominant mechanism for enhancement in mechanical properties. ZrO 2 occupies both the intergranular as well as intragranular positions. However, intragranular zirconias are much smaller compared to intergranular zirconias.

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Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of mullite–zirconia composites by reaction sintering of zircon flour and sillimanite beach sand

et al. 2015

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“…The strong influence of its content, composition, and spatial distribution has been shown. 2 Although reaction sintering between zircon and alumina to produce zirconia-toughened mullite has been largely investigated, [5][6][7][8][9][10][11] not much research was devoted 10,11 to the sintering behavior of mullite itself. The latter studies mainly concern the effect of sintering temperature on the microstructure and strength of dense mullite that has been obtained from very-pure sol-gel powders far from the composition of commonly available commercial products.…”

Section: Introductionmentioning

confidence: 99%

Sintering of Industrial Mullites in the Presence of Magnesia as a Sintering Aid

Montanaro

Perrot

Esnouf

et al. 2000

Journal of the American Ceramic Society

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The sinterability of two industrial mullite powders, in the presence of MgO as a sintering aid, was investigated. A glassy phase, which was generated during preparation, was present in both powders; this glassy phase had a strong influence on sintering, depending on its content, composition, and spatial distribution. MgO promoted sintering in the presence of a liquid phase, both in the as-received materials and in samples washed with HF, in which most of the pre-existing glassy phase was eliminated. Investigations using transmission electron microscopy, coupled with energy-dispersive spectroscopy, as well as dilatometric measurements and X-ray diffraction data, on washed and unwashed materials and on quenched and slow-cooled samples allowed a better understanding of the influence of MgO and the glassy phase on the sintering behavior and the formation of new phases. Most of the phases, in fact, can be explained by using the MgO-Al 2 O 3 -SiO 2 phase diagram, even in such complex systems.

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“…The amorphous silicon dissolves Al 2 O 3 and then reacts with it giving mullite in its most stable form (3:2). The authors [1,2,4,5] point out the presence of a transitory amorphous phase nSiO 2 ÁmAl 2 O 3 , known as non-crystalline mullite.…”

Section: Introductionmentioning

confidence: 99%

“…There are several methods of production of mullite-zirconium composites. These are, among others, sintering of mullite with zirconium oxide, solgel methods, and reactive sintering of aluminum oxide with zircon sand [1][2][3][4][5][6][7][8][9][10][11]. The last method seems to be the best one for industrial production.…”

Section: Introductionmentioning

confidence: 99%

“…Thus, they are commonly used in automobile industry as well as in the industry of refractory materials [1][2][3][4][5], most thermally loaded engine components [6], as catalyst carriers in chemical industry, as heat exchangers, filters, and also as light construction refractory materials [7]. There are several methods of production of mullite-zirconium composites.…”

Section: Introductionmentioning

confidence: 99%

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