Mechanical Properties and Thermal Conductivity of Ytterbium-Silicate-Mullite Composites

Xiao, Jie; Chen, Wenbo; Wei, Liangliang; He, Wenting; Guo, Hongbo

doi:10.3390/ma13030671

Cited by 7 publications

(4 citation statements)

References 41 publications

(40 reference statements)

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“…The decrease in the hardness value with zirconia additions above 3% appears to be due to the increase in porosity, or the hardness values were measured in regions containing pores. In general, the hardness of mullite-composite materials was affected by the crystal size, porosity, and microstructure of mullite-zirconia composite [18]. The compressive strength values of the mullitezirconia composite are shown in Fig.…”

Section: Resultsmentioning

confidence: 99%

Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia

Aswad

Alfatlawi

Saud³

2021

Cerâmica

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The refractory materials used in the wall of the furnaces for glass melting can be prepared from mullite-zirconia composite material. The composite of mullite/zirconia was synthesized from Iraqi kaolin, γ-alumina, and zirconia using thermal decomposition with reaction sintering at 1600 °C. Several batches were prepared with various ratios of kaolin, γ-alumina, and zirconia, and the composite compositions were selected from the Al 2 O 3-SiO 2-ZrO 2 phase diagram. The mullite-zirconia composite was prepared with different steps beginning with milling the starting materials, semi-dry uniaxial pressing, and then reactive sintering at various temperatures (1200, 1400, and 1600 °C). The predicted phases ZrO 2 and Al 6 Si 2 O 13 were identified by X-ray diffraction patterns according to the phase diagram for all the batches. The lower amount of the zirconia added to mullite reduced porosity and improved the bulk density of the mullite/zirconia composite. The thermal expansion coefficient slightly increased with the addition of zirconia. It also enhanced the thermal shock resistance of the composite. Finally, the mechanical properties were improved by increasing the amount of zirconia particles in a matrix of mullite due to the phase transformation of zirconia from tetragonal to monoclinic phase.

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Section: Resultsmentioning

confidence: 99%

Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia

Aswad

Alfatlawi

Saud³

2021

Cerâmica

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“…However, too high content of mullite corresponds to too much impurities, resulting in lower relative density. Meanwhile, the optimal sintering temperature range for mullite ceramics is 1300-1500°C [54,55].…”

Section: Densificationmentioning

confidence: 99%

Effects of flake-shape and content of nano-mullite on mechanical properties and fracture process of corundum composite ceramics

Lian

Liu

Wang

et al. 2021

Journal of Asian Ceramic Societies

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Coal gangue is used to prepare flake nano-mullite with a molten salt method. In order to increase the utilization value, corundum composite ceramics were prepared from the nanomullite and alumina. The effect of particle size of the raw material size and the content of mullite on mechanical properties of the corundum composite ceramics was studied. It is found that the mullite with appropriate sizes can be filled in between the corundum grains, thus increasing the density of the samples. The mechanical properties were enhanced due to the variation in the crack propagation mode. The optimized sample exhibited flexural strength and fracture toughness of 263.7 MPa and 5.0 MPa•m 1/2 , respectively. Griffith fracture theory analysis results indicated that the critical crack size reached 173.9 μm and the fracture energy was 127.6 J/m 2. Coal gangue has realized deep resource utilization, and the mechanical properties of composite ceramics are higher than alumina ceramics prepared under the same conditions. Flake nanomullite contributes to mechanical properties.

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“…These include a high melting point, low volatility [9], excellent mechanical properties, low thermal conductivity, and good phase structure stability above 1400 • C [10][11][12][13][14][15][16]. Some thermal-mechanical properties of bulk ytterbium silicate materials are shown in Table 1 [17]. Compared with YbDS, YbMS exhibits better resistance to water vapor corrosion and CMAS (CaO 2 -MgO-Al 2 O 3 -SiO 2 ) attack [6,13].…”

Section: Introductionmentioning

confidence: 99%

“…The gas-tightness of such a typical structure is not sufficient for use as an EBC. Plasma spray-physical vapor deposition (PS-PVD) is an emerging coating preparation technology that can be used to prepare various advanced coatings [20,21], such as columnar structured coatings, as well as thin and dense coatings by depositing gas and/or liquid and/or solid phases [17,[22][23][24]. In ytterbium silicate, silicon oxide is easily vaporized during the spraying process [25].…”

Section: Introductionmentioning

confidence: 99%

Microstructures and Phases of Ytterbium Silicate Coatings Prepared by Plasma Spray-Physical Vapor Deposition

et al. 2020

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Ytterbium silicate coatings were deposited on SiCf/SiC ceramics matrix composite (CMC) substrates by plasma spray-physical vapor deposition (PS-PVD), and the microstructures and phase constituents of the coatings were studied. The results show that the Yb2SiO5 coating prepared with high power and low pressure (65 kW/2 mbar) had quasi-columnar structure, mainly deposited from the vapor phase, whereas the coating prepared with low power and high pressure (40 kW/10 mbar) had a typical layered structure, mainly deposited from the liquid phase. The deposition efficiency of parameter A (~2 μm/min) was also significantly lower than that of parameter B (~20 μm/min). After annealing at 1300 °C for 20 h, the coating prepared by 65 kW/2 mbar was mainly composed of ytterbium disilicate phase (77.2 wt %). The coating also contained some silicon-rich phase. The coating prepared by 40 kW/10 mbar basically consisted of ytterbium monosilicate (63.6 wt %). In addition, a small amount of silicon-rich phase and ytterbium-rich phase were also present in the coating. Accompanied with calculation results by the FactSage software, the cause of deviations in phase compositions was analyzed.

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Mechanical Properties and Thermal Conductivity of Ytterbium-Silicate-Mullite Composites

Cited by 7 publications

References 41 publications

Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia

Thermal decomposition and reaction sintering for synthesis of mullite-zirconia composite using kaolin, γ-alumina and zirconia

Effects of flake-shape and content of nano-mullite on mechanical properties and fracture process of corundum composite ceramics

Microstructures and Phases of Ytterbium Silicate Coatings Prepared by Plasma Spray-Physical Vapor Deposition

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