Formation and mechanical properties of alumina ceramics based on Al2O3 micro- and nanoparticles

Zemtsova, E. G.; Monin, A. V.; Смирнов, В. М.; Semenov, B. N.; Морозов, Н. Ф.

doi:10.1134/s1029959915020058

Cited by 14 publications

(4 citation statements)

References 13 publications

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“…Consequently, the flexural strength in 1400 °C sintered samples is slightly higher than that of 1500 °C sintered batch. This is in accordance with literature, which suggests an increase in the flexural strength for a decrease in the grain diameter [8,10,11,16,[33][34][35]. On the other hand, although, the samples sintered at 1300 °C and 1350 °C have smaller grain sizes than 1400 °C sintered batch, but possess higher total porosity fractions of 6.7±2.6 % and 5.2±2.6 % respectively, which resulted in smaller flexural strength values.…”

Section: Flexural Strength Resultssupporting

confidence: 91%

“…In another study [35], it was demonstrated that flexural strength of amorphous anodized microporous (pore diameter > 50 nm) alumina decreased from 182 MPa to 48 MPa for an increase in the porosity from 22.7 % to 51.7 %, suggesting a decreasing trend for strength as a function of porosity fraction, similar to our analysis. In a recent report [16], ultrafine 95 % dense alumina (grain diameter of 150 nm) fabricated by sol-gel and sintering techniques, showed a flexural strength of 420 MPa, which is in the same range as that of 1350 °C samples batch in the current study. However, this article is not exhaustive because, the pore size data and reproducibility of the flexural strength data were not reported.…”

Section: Flexural Strength Resultssupporting

confidence: 71%

“…Limited literature is available on the flexural strength of non-equiaxed fully dense α−Al2O3 samples [9]. Although, it has been well established that flexural strength increases with a decrease in the grain size [8], [9], [10], [11], very limited literature is available on the flexural strength of fine grained fully dense α−Al2O3 samples [16].…”

Section: Introductionmentioning

confidence: 99%

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Flexural strength evaluations and fractography analyses of slip cast mesoporous submicron alumina

Rowthu

Saeidi

Wasmer

et al. 2018

Ceramics International

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Mesoporous submicron α−Al2O3 green compacts were fabricated using slip casting of ultrafine alumina powders. The pre-sintered samples were sintered in air atmosphere at 1300 °C, 1350 °C, 1400 °C, and 1500 °C to obtain a variety of grain morphologies namely submicron equiaxed and micro rod structures. The resulting grain diameters lie between ∼270 nm and ∼1590 nm and total porosity fraction between 0.05 % and 13 %. The room temperature flexural strength (σ) evaluations and fractography analyses of sintered alumina samples were performed. It was observed that the total porosity fraction dictates the flexural strength as compared to grain diameter. Further, it was found that the flexural strength exhibited a decreasing trend for an increase in the total porosity fraction, and proved to be a better effective parameter than open porosity fraction. The fractography analyses suggest that samples sintered at 1300 °C and 1350 °C predominantly underwent intergranular fracture, while those sintered at 1400 °C and 1500 °C underwent a mixture of intergranular and transgranular fracture.

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Section: Flexural Strength Resultssupporting

confidence: 91%

Section: Flexural Strength Resultssupporting

confidence: 71%

Section: Introductionmentioning

confidence: 99%

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Flexural strength evaluations and fractography analyses of slip cast mesoporous submicron alumina

Rowthu

Saeidi

Wasmer

et al. 2018

Ceramics International

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“…are weak mechanically, i.e., lower porosity gives greater strength and porous materials are mechanically weak [31]. The measurement of porosity is used to identify the quality and strength of ceramic material [16,32]. Figure 7 shows the porosity vs. rock residue addition.…”

Section: Porosity Of Ceramic Bodiesmentioning

confidence: 99%

Ceramic bodies with rock processing residues (RPR) for constructing materials

Vijayaragavan¹,

Mullainathan

Nithiyanantham

2020

Waste Dispos. Sustain. Energy

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The rock processing residue (RPR) waste is used for part of the ceramic products. The present work deals with the unused waste useful for making ceramic materials and save the area and the dump space. The residues are initially analyzed with the chemical and spectroscopic method. The residues are mixed with clay of proportions 0-50 wt% in steps of 10%. The prepared specimens are characterized with Fourier transform infrared (FTIR), X ray fluorescence (XRF) for chemical, mechanical, and physiochemical properties, such as density, compressive strength, weight loss on ignition and porous nature, which are measured through the selective instrument. The thermal stability of the product was tested by firing at 950 °C. This says the rock residues are useful for making ceramic and related materials with high concentrations.

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