Improving the microstructural and mechanical properties of in-situ zirconia-mullite composites by optimizing the simultaneous effect of mechanical activation and additives

Sistani, Pooneh Barfi; Mollazadeh, Samaneh; Rashid, Ali Reza Kiani

doi:10.1016/j.ceramint.2019.09.113

Cited by 10 publications

(5 citation statements)

References 30 publications

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“…Besides, the lower ionic radius of Zn 2+ ion than Ca 2+ resulted in the formation of stronger bonds with oxygen atoms in the structure of BGs. Decreasing the crystallinity degree of BGs at the effect of ZnO could also increase the microhardness values of GIC samples in line with the previous study [31,35,36] . In summary, the homogenous distribution of BGs in the polymeric substrate and the smaller particles size of the samples could increase the microhardness of the samples.…”

Section: Microhardnesssupporting

confidence: 90%

The Effect of ZnO on the Physicochemical and Mechanical Properties of Aluminosilicate Dental Cements

kahrobaee¹,

Mazinani²,

Kermani³

et al. 2021

non-met. mater. sci.

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In this study, the effect of the addition of various amounts of ZnO (0, 1, 2, and 3 wt. %) to aluminosilicate bioactive glass (BGs) network (SiO2-Al2O3- P2O5-CaF2-CaO-K2O-Na2O) on the mechanical properties of the fabricated glass ionomer cement (GIC) samples was studied. The GIC samples were fabricated by mixing the synthesized aluminosilicate BGs with Rivaself cure liquid. The synthesized aluminosilicate glass was characterized using differential thermal analysis (DTA), X-Ray diffraction (XRD), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM). Besides, the mechanical properties of GICs were evaluated using Vickers microhardness and Diametral tensile strength (DTS) test. According to DTA analysis, the glass transition temperature (Tg) of aluminosilicate BGs was decreased from 575 to 525 °C. According to the results, the aluminosilicate BGs with an amorphous state (~90%) and the grain size of 36 μm were synthesized. Doping of the ZnO to glass network up to 3 wt. % could increase the amorphous phase up to 95% and decrease the grain size of the particles up to 28 μm. The microhardness and DTS of the GIC samples containing the aluminosilicate BGs were about 677 Hv and 8.5 MPa, respectively. Doping of ZnO to the glass network increased the mentioned values up to 816 Hv and 12.1 MPa, respectively.

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Section: Microhardnesssupporting

confidence: 90%

The Effect of ZnO on the Physicochemical and Mechanical Properties of Aluminosilicate Dental Cements

kahrobaee¹,

Mazinani²,

Kermani³

et al. 2021

non-met. mater. sci.

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“…The combination of the properties of mullite makes it a ceramic material of great technological importance, with wide applicability, both in traditional and advanced ceramics. Among the various products in which mullite is present, the following stand out: refractories [105][106][107][108][109][110], porcelain tiles [111,112], porcelains [113,114], porous high-resistance ceramics [115][116][117][118][119], membranes [18,120,121], crucibles [106], optical [122][123][124] and electronic components [28,[124][125][126][127], and matrix and reinforcement of composite materials [18,[128][129][130][131][132][133][134][135][136][137]. In recent years, many studies have been carried out to diversify the raw materials and methods used for the synthesis of mullite and, in this way, to further expand its applicability.…”

Section: Applicationsmentioning

confidence: 99%

“…Mullite-zirconia, mullite-cordierite, and mullite-corundum composites are widely known for their applications as refractories. High chemical stability, thermal shock resistance, and adequate mechanical properties, specifically high fracture toughness, are some of the characteristics that make these materials potential candidates for traditional and advanced industries [130][131][132]. Maldhure et al [128] prepared mullite-corundum composites using bauxite as the major raw material.…”

Section: Applicationsmentioning

confidence: 99%

“…The addition of 5 wt% of SiC was considered the ideal amount to obtain the best performance of the mullite-cordierite composite. Sistani et al [132] investigated the microstructural properties, mechanical strength, and surface roughness of zirconiamullite composites. The simultaneous effect of the duration of the mechanical activation process by grinding and the addition of TiO 2 and ZnO were studied.…”

Section: Applicationsmentioning

confidence: 99%

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Microstructural characteristics, properties, synthesis and applications of mullite: a review

et al. 2022

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Mullite, an intermediate phase of the binary alumina-silica system, is one of the most important phases of ceramic products containing alumina and silica in the initial composition. Its stoichiometry ranges from 3Al 2 O 3 .2SiO 2 (3:2) to 2Al 2 O 3 .SiO 2 (2:1) and its crystalline structure is orthorhombic, characterized by the presence of octahedral chains of AlO 6 interconnected by tetrahedral chains of aluminum-oxygen and/or silicon-oxygen (AlO 4 /SiO 4 ). Properties such as high chemical and thermal stability, low thermal expansion and conductivity, and good mechanical strength enable a wide range of applications. Due to the relevance of this material, it is important for the scientific community to understand its microstructural characteristics, properties, methods of synthesis, and various applications. Therefore, this article aimed to make a comprehensive review on the mullite to gather and present to the reader a series of relevant information that makes it possible to deepen the knowledge about mullite.

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“…Both the tensile strength and Vickers micro-hardness of the sintered samples were enhanced with increasing milling time. The same authors [20] studied the coinciding impact of the mechanical activation procedure and the addition of TiO 2 and zinc oxide (ZnO) to the starting materials. The impact on the diametral tensile strength, Weibull modulus, and surface roughness of the produced sintered samples was considered.…”

Section: Introductionmentioning

confidence: 99%

Characterization of in-situ zirconia/mullite composites prepared by sol-gel technique

Abdallah

Sayed

Awaad

et al. 2021

Journal of Asian Ceramic Societies

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The main objective of this study was to investigate the role of zirconia addition to mullite through an in-situ reaction aimed at improving both the mechanical properties and the sinterability behavior. In this work, mullite-zirconia composites were produced using a solgel technique. Different amounts of zirconia (0, 10, 15, and 20 wt.%) were added to the mullite, and the calcined gels were sintered at 1550-1700°C for 1 h. The apparent porosity and bulk density of the blank and zirconia/mullite composites were estimated in accordance with ASTM C-20. The phase composition and sample morphology were evaluated via X-ray diffraction (XRD) and scanning electron microscopy analysis (SEM), respectively. Furthermore, the mechanical properties and thermal expansion coefficient (TEC) were also evaluated. The results revealed that the apparent porosity decreased and the density of the zirconia/mullite composites increased when the sintering temperature was increased from 1550 to 1700°C. However, the mechanical properties improved with increasing zirconia content and MZ20 sintered at 1700°C exhibited the maximum bending strength. The TEC results reflected the influence of the composition on the sample TEC. Samples with higher ZrO 2 content yielded higher TEC figures than those with lower content.

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Improving the microstructural and mechanical properties of in-situ zirconia-mullite composites by optimizing the simultaneous effect of mechanical activation and additives

Cited by 10 publications

References 30 publications

The Effect of ZnO on the Physicochemical and Mechanical Properties of Aluminosilicate Dental Cements

The Effect of ZnO on the Physicochemical and Mechanical Properties of Aluminosilicate Dental Cements

Microstructural characteristics, properties, synthesis and applications of mullite: a review

Characterization of in-situ zirconia/mullite composites prepared by sol-gel technique

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