Fragmentations of Alumina(Al2O3) and Silicon Carbide(SiC) under quasi-static compression

Zhang, Qingyan; Zheng, Yuxuan; Zhou, Fenghua; Yu, Tongxi

doi:10.1016/j.ijmecsci.2019.105119

Cited by 14 publications

(3 citation statements)

References 13 publications

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“…[30] In this paper, 35.5 MPa was used as the tensile strength of alumina, and the compressive strength of alumina is 2600 MPa. [31] The time required 076107-6 for the compressive stress to reach the compressive strength is the compressive stress shell-breaking response time. Similarly, the time required for the tensile stress to reach the tensile stress strength is the tensile shell-breaking response time.…”

Section: Results Analysis 31 Heating Process Of Micron-scale Aluminum...mentioning

confidence: 99%

Influence of particle size on the breaking of aluminum particle shells

Wang¹,

Zhou²,

Peng³

et al. 2022

Chinese Phys. B

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The rupture of the alumina shell (shell-breaking) is a prerequisite for the energy release of aluminum powder. The thermal stress overload in a high temperature environment is one of the important factors for the rupturing of the alumina shell. COMSOL Multiphysics was used to simulate and analyze the shell-breaking response of micron aluminum particles with different particle sizes at 650 ℃ under vacuum environment. The simulation result shows that the thermal stability time and shell-breaking response time of 10-100 μm aluminum particles are 0.15-11.44 μs and 0.08-3.94 μs respectively. It also shows the direct shell-breaking cause of aluminum particle with different particle sizes. When the particle size is less than 80 μm, the shell-breaking response is directly caused by compressive stress overload. When the particle size is 80-100 μm, the shell-breaking response is directly caused by tensile stress overload. This article has guiding significance for the research on the energy release of aluminum powder.

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Section: Results Analysis 31 Heating Process Of Micron-scale Aluminum...mentioning

confidence: 99%

Influence of particle size on the breaking of aluminum particle shells

Wang¹,

Zhou²,

Peng³

et al. 2022

Chinese Phys. B

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“…The results showed that the maximum pressure in the Al core of 100 nm Al nanoparticles at 600 °C was 0.051 Gpa (See Ref. [30] Figure 5b). To verify the accuracy of the Al particle model with this result, an Al nanoparticle model with a diameter of 100 nm and an alumina shell thickness of 4.6 nm was established.…”

Section: Finite Element Modelmentioning

confidence: 99%

“…The tensile strength of alumina is between 35.5 and 53.1 MPa [31]. In this paper, 35.5 MPa was used as the tensile strength of alumina, and the compressive strength of alumina is 2600 MPa [30]. The time required for compressive stress to reach compressive strength is the compressive stress shell-breaking response time.…”

Section: Breaking Characteristics and Mechanism Of Al Nanoparticlesmentioning

confidence: 99%

Study on the Size Dependence of the Shell-Breaking Response of Micro/Nano Al Particles at High Temperature

Zhou,

Chai,

Wang

et al. 2024

Nanomaterials

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The reactivity of Al nanoparticles is significantly higher than that of micron Al particles, and the thermal reaction properties exhibit notable distinctions. Following the previous studies on micron Al particles, the shell-breaking response of Al nanoparticles under vacuum conditions was analyzed using COMSOL simulation. Relationships between thermal stabilization time, shell-breaking cause, shell-breaking response time, and particle size were obtained, and a systematic analysis of the differences between micrometer and nanometer-sized particles was conducted. The results indicate that the thermal stabilization time of both micrometer and nanometer particles increases with the enlargement of particle size. The stress generated by heating Al nanoparticles with sizes ranging from 25–100 nm is insufficient to rupture the outer shell. For particles within the size range of 200 nm to 70 μm, the primary cause of shell-breaking is compressive stress overload, while particles in the range of 80–100 μm experience shell rupture primarily due to tensile stress overload. These results provide an important basis for understanding the shell-breaking mechanism of microns and nanoparticles of Al and studying the oxidation mechanism.

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