Microstructure and mechanical properties of CaAl12O19 reinforced Al2O3-Cr2O3 composites

Cui, Kunkun; Fu, Tao; Zhang, Yingyi; Wang, Jie; Mao, Haobo; Tan, Tianbiao

doi:10.1016/j.jeurceramsoc.2021.08.024

Cited by 63 publications

(22 citation statements)

References 59 publications

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“…Therefore, to improve the TSR of ceramic materials and explore the mechanism of thermal shock damage of ceramic materials has become a key problem to be solved urgently. Many researchers have used experiments, theories, and numerical simulation methods to study the thermal shock behaviors of ceramics and discuss the TSR of ceramics, and they have achieved important results (Cui et al, 2021b;Zhang et al, 2022).…”

Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal Shock Cracking Behaviors of Ceramics Based on the Force-Heat Equivalence Energy Density Principle

Pang

Lü

et al. 2022

Front. Mater.

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Thermal shock is one of the main causes for the fracture of ceramic materials due to their inherent brittleness. Aiming to explore the mechanism of thermal shock cracking behavior of ceramics under different thermal shock conditions, a novel temperature-dependent failure criterion of thermal shock fracture of the ceramic materials was deduced based on the force-heat equivalence energy density principle. Combining this failure criterion and the finite element method, the thermal shock cracking behaviors of the thin circular and rectangular ceramic slabs under different thermal shock initial temperature were simulated. Results show that the morphology, periodicity, hierarchy, and number of thermal shock cracks obtained by numerical simulation are in good agreement with the experimental results. These essential characteristics verify the validity of the temperature-dependent failure criterion for thermal shock fracture. Furthermore, the strain energy of tension produced by thermal shock is proved to be the dominated mechanism for thermal shock-induced fracture.

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Section: Introductionmentioning

confidence: 99%

Numerical Analysis of Thermal Shock Cracking Behaviors of Ceramics Based on the Force-Heat Equivalence Energy Density Principle

Pang

Lü

et al. 2022

Front. Mater.

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“…Under the influence of an elevated temperature, the chemical composition and physical structure of the cement paste changes significantly, the C-S-H phase is remodeled [ 72 ]. In addition, the thermal shock resistance of cement composites is influenced by such variables as modulus of elasticity, fracture energy, thermal conductivity or thermal expansion [ 73 ]. The best results among the mortars exposed to high temperatures were obtained by samples with 5% wt.…”

Section: Resultsmentioning

confidence: 99%

Properties and Strength Prediction Modeling of Green Mortar with Brick Powder Subjected to a Short-Term Thermal Shock at Elevated Temperatures

et al. 2021

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The cement industry is responsible for 8% of global CO2 production. Therefore, a clear trend has been observed recently to replace to some extent the main binder of cement composites with environmentally friendly or recycled materials with a lower carbon footprint. This paper presents the effect of brick powder (BP) on the physico-chemical and mechanical properties of cement mortars. The effect of a short-term thermal shock on morphology and strength properties of green mortars was investigated. BP addition caused increase in porosity and decrease in compressive and flexural strength of mortars. The best results were obtained for samples with 5% wt. BP addition. Above this addition the strength decreased. The mechanical performance of the samples subjected to thermal loading increased compared to the reference samples, which is the result of a process called as the “internal autoclaving”. The BP addition positively affects the linear shrinkage, leading to its reduction. The lowest linear shrinkage value was achieved by the mortar with the highest BP addition. An intelligent modeling approach for the prediction of strength characteristics, depending on the ultrasonic pulse velocity (UPV) is also presented. To solve the model problem, a supervised machine-learning algorithm in the form of an SVM (support vector machines) regression approach was implemented in this paper. The results indicate that BP can be used as a cement replacement in cement mortars in limited amounts. The amount of the additive should be moderate and tuned to the features that mortars should have.

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“…At present, the alloying and surface-coating technology are the main methods to increase the oxidation resistance of the basal materials [15,16]. The types of molybdenum alloys and the various surface coating technologies of Mo and its alloys are shown in Figure 1 [17][18][19][20]. It can been seen that the Ti, Zr, W, Re, Si, B, Hf, C and rare earth oxides are often added to pure Mo as beneficial elements to prepare molybdenum alloys.…”

Section: Introductionmentioning

confidence: 99%

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

Shen

Zhang

et al. 2022

Coatings

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Molybdenum and its alloys, with high melting points, excellent corrosion resistance and high temperature creep resistance, are a vital high-temperature structural material. However, the poor oxidation resistance at high temperatures is a major barrier to their application. This work provides a summary of surface modification techniques for Mo and its alloys under high-temperature aerobic conditions of nearly half a century, including slurry sintering technology, plasma spraying technology, chemical vapor deposition technology, and liquid phase deposition technology. The microstructure and oxidation behavior of various coatings were analyzed. The advantages and disadvantages of various processes were compared, and the key measures to improve oxidation resistance of coatings were also outlined. The future research direction in this field is set out.

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Microstructure and mechanical properties of CaAl12O19 reinforced Al2O3-Cr2O3 composites

Cited by 63 publications

References 59 publications

Numerical Analysis of Thermal Shock Cracking Behaviors of Ceramics Based on the Force-Heat Equivalence Energy Density Principle

Numerical Analysis of Thermal Shock Cracking Behaviors of Ceramics Based on the Force-Heat Equivalence Energy Density Principle

Properties and Strength Prediction Modeling of Green Mortar with Brick Powder Subjected to a Short-Term Thermal Shock at Elevated Temperatures

Oxidation Protection of High-Temperature Coatings on the Surface of Mo-Based Alloys—A Review

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