Mechanical properties of dense to porous alumina/lanthanum hexaaluminate composite ceramics

Negahdari, Zahra; Willert‐Porada, Monika; Pfeiffer, Carolin

doi:10.1016/j.msea.2010.01.050

Cited by 23 publications

(6 citation statements)

References 24 publications

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“…Table 3 shows the variations in the mechanical properties for the different ratios of rice husk ash content and porosity. Generally, the mechanical properties of the porous materials decrease with an increase in the porosity [33]. According to Rice's formula ( = ∘ (− ) ), where ∘ and are the strengths of the nonporous and porous materials, is the constant value related to the pore characteristics and is the porosity of the porous materials [34][35][36].…”

Section: The Porosity Density Mechanical Properties and Porementioning

confidence: 99%

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

Ali

Hanim

Tahir

et al. 2017

Advances in Materials Science and Engineering

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A porous ceramic is made from composite materials which consist of alumina and commercial rice husk ash. This type of ceramics is obtained by mixing the commercial rice husk ash as a source of silica (SiO2) and a pore forming agent with alumina (Al2O3) powder. To obtain this type of ceramic, a solid-state technique is used with sintering at high temperature. This study also investigated the effects of the rice husk ash ratios on the mechanical properties, porosity, and microstructure. The results showed that, by increasing the content of the rice husk ash from 10 to 50 wt%, there is an increase in the porosity from 42.92% to 49.04%, while the mechanical properties decreased initially followed by an increase at 30 wt% and 50 wt%; the hardness at 20 wt% of the ash content was recorded at 101.90 HV1. When the ash content was increased to 30 wt% and 50 wt%, the hardness was raised to 150.92 HV1and 158.93 HV1, respectively. The findings also revealed that the tensile and compressive strengths experienced a decrease at 10 wt% of the ash content and after that increase at 30 wt% and 50 wt% of rice husk ash. XRD analysis found multiple phases of ceramic formation after sintering for the different rice husk ash content.

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Section: The Porosity Density Mechanical Properties and Porementioning

confidence: 99%

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

Ali

Hanim

Tahir

et al. 2017

Advances in Materials Science and Engineering

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“…On the one hand, the greater ink application reduced the area and size of the glassy surfaces, until they canceled out at the maximum ink application, 800 dpi, which contributed to enhancing the coating's mechanical properties. On the other, the presence of pores in the VSI of these coatings, which increased with ink application, tended to lower coating mechanical properties 18,19,20 . The result of both effects led the variation of mechanical properties with ink application to peak at 400–600 dpi (Tables 4 and 5).…”

Section: Resultsmentioning

confidence: 97%

“…On the other, the presence of pores in the VSI of these coatings, which increased with ink application, tended to lower coating mechanical properties. 18,19,20 The result of both effects led the variation of mechanical properties with ink application to peak at 400-600 dpi (Tables 4 and 5).…”

Section: Microhardnessmentioning

confidence: 99%

Improvement of the mechanical and aesthetic properties of a coating by inkjet technology

Amorós

Blasco

Moreno

et al. 2021

Int J Applied Ceramic Tech

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Different amounts of ink, made up almost entirely of a frit that devitrified abundant small crystals of anorthoclase, were applied by inkjet printing onto a traditional unfired glaze substrate. The rheological properties of the ink and porous texture of the unfired glaze substrate were characterized. The fired coatings were analyzed by SEM-EDX to determine the elemental composition at different surface depths, and their microstructure was observed. The results confirmed the validity of the ink penetration model, developed in a previous study, for describing the composition profile How to cite this article: Amorós JL, Blasco E, Moreno A, Feliu C, Boschi AO, Marín N. Improvement of the mechanical and aesthetic properties of a coating by inkjet technology.

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“…Others determined an optimum LHA content of 20 vol% for maximum fracture toughness, hardness and elastic modulus . LHA features prominently among the HAs used for the reinforcement of composite ceramics. ,, , − It appears that the relatively weak mirror planes in the layered HA structure play an important role in crack deflection, while LHA grains also contribute to the limitation of grain growth of the host material (e.g., of alumina in alumina ceramics) . Similar arguments apply to the use of HAs as fiber-matrix interphases in fiber-reinforced ceramics , , , and oxide composite fibers .…”

Section: Lanthanum Hexaaluminate (Lha)mentioning

confidence: 99%

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

Heveling

2023

Ind. Eng. Chem. Res.

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Advanced materials based on lanthanum–aluminum oxides are useful for many practical applications, not the least in catalysis, energy conversion and energy storage systems designed for a sustainable world economy. The three main La–Al–O (LAO) combinations of commercial interest are La-doped aluminas (LDA), lanthanum monoaluminate (LMA, a perovskite), and lanthanum hexaaluminate (LHA). Usually, the literature treats doped aluminas, perovskites, and hexaaluminates separately. The current review tries to identify common trends and features with respect to structure, synthesis, and applications of LAOs, which should lead to a more holistic understanding of their chemistry. This, in turn, should trigger innovative ideas with respect to new or improved applications. Apart from a variety of uses at low temperatures, the main advantages of LDA, LMA, LHA, and related compounds are their high-temperature stability and the extended applicability that comes with it.

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Mechanical properties of dense to porous alumina/lanthanum hexaaluminate composite ceramics

Cited by 23 publications

References 24 publications

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

The Effect of Commercial Rice Husk Ash Additives on the Porosity, Mechanical Properties, and Microstructure of Alumina Ceramics

Improvement of the mechanical and aesthetic properties of a coating by inkjet technology

La-Doped Alumina, Lanthanum Aluminate, Lanthanum Hexaaluminate, and Related Compounds: A Review Covering Synthesis, Structure, and Practical Importance

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