Control of calcium hexaluminate grain morphology in in-situ toughened ceramic composites

An, Liqiong; Chan, Helen M.; Soni, K. K.

doi:10.1007/bf00354672

Cited by 107 publications

(41 citation statements)

References 15 publications

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“…Regarding the CA 6 formation, reducing the microsilica content led to the generation of equiaxed crystals, as observed for the fine MgO source [7] and also pointed out by An et al [20]. This result is confirmed in Fig.…”

Section: Microsilica Effect On Al 2 O 3 -Mgo Castables Containing Coasupporting

confidence: 84%

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Braulio

Brant²,

Bittencourt³

et al. 2009

Ceramics International

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Section: Microsilica Effect On Al 2 O 3 -Mgo Castables Containing Coasupporting

confidence: 84%

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Braulio

Brant²,

Bittencourt³

et al. 2009

Ceramics International

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“…The development of CA 6 grains with different morphology can be explained in terms of distinct CA 6 reaction mechanisms, resulting from differences in the reactivity of the powders [12]. In this work, samples CA-CaCO 3 presented a platelet structure, whereas for the HA-CaCO 3 ones, a more equiaxial morphology was observed, as showing at …”

Section: Resultsmentioning

confidence: 53%

“…Calcium hexaluminate (CaAl 12 O 19 , CaO.6Al 2 O 3, or simply CA 6 ), also known as hibonite, is an alumina-rich intermediate compound of the CaO-Al 2 O 3 system, with high thermal stability and refractoriness (melting point of 1830°C) [1,[4][5][6][7]. It is formed according with the general expression: 6Al 2 O 3 + CaO → CaAl 12 O 19 (1)…”

Section: Introductionmentioning

confidence: 99%

Production of porous ceramic materialusing different sources of alumina and calcia

et al. 2015

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Numerous papers and publications report the use of microporous calcium hexaluminate (CaO.6Al 2 O 3 ; CA 6 ) as a key raw material for high temperature insulating materials. This material has unique properties with respect to chemical purity and mineral composition. Another important property of CA 6 is its structure, which consists of platelet-shaped crystals that interlock. The free distance between the crystals defines the microporous structure. The low density in combination with the micropores hampers heat transfer by radiation at temperatures exceeding 1000 o C and results in a low thermal conductivity. Given the advantages presented by this material, it is necessary to understand the formation mechanism of CA 6 grains in order to better develop the potential applications of this material. CA 6 can be fabricated using organic binders to consolidate the Al 2 O 3 -CaCO 3 powder mixture and to provide green strength so that a green body can be formed and retains the desired shape before heating. However, these organic binders must be completely thermally decomposed so that they do not remain in the sintered body as carbon or ash. Moreover, the use of organic binders releases large volumes of gases such as carbon dioxide from the green body during heating. Therefore, an eco-friendly ceramic fabrication process has been developed that employs an inorganic binder (hydraulic alumina). The aim of the present work was to study the synthesis of porous calcium-hexaluminate ceramics using calcined alumina or hydraulic alumina combined with different sources of calcia (CaCO 3 and Ca(OH) 2 ) at different temperatures. The materials produced were characterized by X-ray diffraction, scanning electron microscopy, apparent porosity and mercury intrusion porosimetry. The materials produced by hydraulic alumina presented higher porosity and larger pores compared to those produced from calcined alumina.

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“…However, according to the standard [5], it appears that the value is still lower than the standard which must not be less than 9.00 Kg.cm -2 . On the other hand, the calcium hexaluminate,CA 6 exhibites the most good thermal properties of the calcium aluminate system with a melting point above 1850 °C [14][15][16][17]. Also, the Permanent Linear Change (PLC) values show decreasing trend with increasing cured time.…”

Section: Mechanical and Chemical Propertiesmentioning

confidence: 99%

Thermal Insulation and Strength Characteristics of Refractory Incorporating Natural Silica

Namboonruang

2016

MATEC Web Conf.

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Abstract. This work emphasizes on the studying of using silica to develop for the production of refractory materials. Materials are tested at the cured times of 7, 14 and 28 days. Results show that the cold crushing strength, flexural strength and bulk density increase with increasing cured times. On the other hand, the permanent linear change (PLC) decreases with increasing cured times. It is also found that adding more silica contents can increase the durability of cracking property due to temperature changing. This study concludes that the silica refractory materials (SRM) shows the enough quality to produce as the refractory material, type of the Conventional Cast/Pound (815 °C) for the agroindustry using the thermal energy of Thailand.

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Control of calcium hexaluminate grain morphology in in-situ toughened ceramic composites

Cited by 107 publications

References 15 publications

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Microsilica or MgO grain size: Which one mostly affects the in situ spinel refractory castable expansion?

Production of porous ceramic materialusing different sources of alumina and calcia

Thermal Insulation and Strength Characteristics of Refractory Incorporating Natural Silica

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