Mechanical evaluation of cordierite precursor green bodies obtained by starch thermogelling

Sandoval, María Laura; Pucheu, M.A.; Talou, Mariano H.; Martínez, A.G. Tomba; Camerucci, M.A.

doi:10.1016/j.jeurceramsoc.2009.07.008

Cited by 25 publications

(18 citation statements)

References 24 publications

(33 reference statements)

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“…2. One of the most significant differences between the microstructures developed by CR and PGR is the presence or absence of starch granules (confirmed by EDAX 19 ) that preserved their integrity. These starch granules together with granules without integrity and, principally, amylose molecules leached by the granules as they swell, form the gel structure in the green disks providing a binding effect between ceramic particles.…”

Section: Characterization Of Green Disksmentioning

confidence: 92%

Two alternative routes for starch consolidation of mullite green bodies

Talou

Camerucci

2010

Journal of the European Ceramic Society

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Section: Characterization Of Green Disksmentioning

confidence: 92%

Two alternative routes for starch consolidation of mullite green bodies

Talou

Camerucci

2010

Journal of the European Ceramic Society

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“…Also clay‐based materials, and, very recently, porcelain foams have been prepared using starch consolidation casting. At the same time, processing details as well as process optimization and material characterization issues of starch consolidation casting were further investigated for alumina and cordierite . While in the first applications of starch consolidation casting to cordierite modified potato starch (modified by hydroxypropylation and crosslinking) has been used, the aforementioned later research was primarily focused on the use of native potato starch and native and modified cassava (tapioca) starches.…”

Section: Introductionmentioning

confidence: 99%

Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

et al. 2015

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The rheology of suspensions and mechanical properties of green bodies with cordierite composition (raw materials 37 wt% kaolin, 41 wt% talc, 22 wt% alumina, resulting in 46.6 wt% SiO2, 38.1 wt% Al2O3, 13.6 wt% MgO) and two types of starch (corn or potato) are investigated. Rotational viscometry of suspensions with solids loading 50, 60, and 70 wt% without starch showed that all tend to be shear‐thinning with a small degree of thixotropy. Suspensions with a total solids loading of 60 wt% with 25 wt% replaced by starch exhibited higher viscosity and thixotropy, but the viscometric behavior is almost identical for the two starch types (apparent viscosities 130–50 mPa·s). Oscillatory rheometry shows that for suspensions with potato starch the onset temperature for gelatinization is 61°C–63°C, that is, lower than for corn starch (72°C–73°C). Maximum storage moduli and phase shift values after gelatinization are similar for both systems. The mechanical properties of green disks, measured via diametral compression tests, reveal clear differences between materials prepared with corn and potato starch, with the latter showing higher elastic modulus, higher strength, and higher deformation at fracture, obviously because of incompletely gelatinized starch granules in the green bodies prepared with corn starch.

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“…Experimental conditions (temperature and dwell time) used for the consolidation of suspensions were established on the basis of results previously reported by the authors (Sandoval et al (2009), Sandoval et al (2010) and other data reported in the literature (Alves et al (1998)). The suspensions were poured into cylindrical bronze molds, which were heated in an electric stove with forced circulation of air (UFP 400, Memmert, Germany) at 80 °C for 4 h and dried at 40 °C for 12 h. Once the consolidation was completed, the samples were taken out of their molds.…”

Section: Preparation and Characterization Of Porous Cordierite-based mentioning

confidence: 99%

High Temperature Mechanical Behavior of Porous Cordierite-based Ceramic Materials Evaluated Using 3-point Bending

Gass

Sandoval

Talou

et al. 2015

Procedia Materials Science

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Cordierite-based ceramics are an important segment of the present ceramic industry. In the last years, cordierite-based porous ceramics have received great attention as light structural materials, thermal insulting and catalyst supports, among others. For these applications, a combination of high porosity and low weight of the component are required, together with mechanical stability even at high temperatures which might prevail in use. The combination of these requirements is a challenge due to the compromise existing among them. In this work, materials prepared from two precursor mixes of cordierite based on kaolin, talc and alumina by thermal consolidation (80 °C, 4 h) of stable aqueous suspensions mix-starch were evaluated. Two different native starches, potato and corn, were employed. The starch gel, which acted as binder in the green body, generated the pores when it was eliminated during a further thermal treatment (650 °C, 2 h). The transformation of the raw materials in cordierite was carried out by reaction-sintering at 1330 °C, 4 h. Cylindrical bars of 35-50 mm in length and 3.5-4.0 mm in diameter were prepared using this method, and then, they were mechanically tested from room temperature to 1100 °C using 3-point bending. A servohydraulic testing machine INSTRON 8501 and a SiC fixture (span: 30 mm) were used for the mechanical testing. The tests were performed in displacement control with a constant rate of 0.1 mm/min. The difference observed in the behavior and the mechanical parameters (Young modulus and mechanical strength) of final materials were related with the characteristics of raw materials and their composition, texture and microstructure, especially porosity and the presence of glassy phase.

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Mechanical evaluation of cordierite precursor green bodies obtained by starch thermogelling

Cited by 25 publications

References 24 publications

Two alternative routes for starch consolidation of mullite green bodies

Two alternative routes for starch consolidation of mullite green bodies

Starch Consolidation Casting of Cordierite Precursor Mixtures—Rheological Behavior and Green Body Properties

High Temperature Mechanical Behavior of Porous Cordierite-based Ceramic Materials Evaluated Using 3-point Bending

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