Obtaining transparent silica glass from nano-silica hydrosol

Chen, YuHui; Hu, Xing; Lin, Tong; Li, Yang; Ling, Zhiyuan

doi:10.1016/j.ceramint.2021.03.270

Cited by 10 publications

(3 citation statements)

References 27 publications

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“…29−31 The improvement is rooted in the ultra-high hardness of stishovite, which is 5 times harder than the silica glass matrix. 32,33 Despite excellent hardness, brittleness is also an important parameter to evaluate a good transparent armor. It is known that brittleness will lead to the fast propagation of cracks under shock compression and ballistic impact.…”

Section: ■ Introductionmentioning

confidence: 99%

“…Fused silica has been substantially investigated as a facing material for transparent armor because of its high hardness and transparency. − Previous studies indicate that fused silica will transform into stishovite when it experiences heavy shock compression, improving the ballistic protection performance. − The improvement is rooted in the ultra-high hardness of stishovite, which is 5 times harder than the silica glass matrix. , Despite excellent hardness, brittleness is also an important parameter to evaluate a good transparent armor. It is known that brittleness will lead to the fast propagation of cracks under shock compression and ballistic impact. , The propagation of cracks will continuously decrease the ballistic resistance under multi-hit impacts.…”

Section: Introductionmentioning

confidence: 99%

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Amorphization Toughening Induced by Microcracks in SiO₂ Thin Films

Gao

Zhang

et al. 2023

J. Phys. Chem. C

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Fused silica, a widely used facing material of transparent armor, was found to transform into stishovite under heavy shock compression. The ballistic-resistant performance of the partially transformed fused silica, which is highly correlated to the crack initiation and propagation processes, is important for multi-hit possibility. The ultra-high hardness and strength of stishovite are beneficial for the reduction of crack initiation. However, how the pre-existing cracks in stishovite propagate is an open question. Here, by combining molecular dynamics simulations and density functional theory calculations, we investigate the fracture behavior of crystalline stishovite with pre-existing cracks at room temperature. It is found that the crystalline stishovite phase transforms into an amorphous phase via a deformed phase under tensile loading, leading to a ductile fracture. Amorphization is localized on crack tips because of the strain concentration. Amorphization helps to inhibit crack propagation by volume expansion, increasing the final fracture strain. The amorphization mechanism and crack propagation path are robust when the shape of cracks changes. These results provide a reference for application of fused silica-based transparent armor systems.

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Section: ■ Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Amorphization Toughening Induced by Microcracks in SiO₂ Thin Films

Gao

Zhang

et al. 2023

J. Phys. Chem. C

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show abstract

“…Nowadays, silica sand is the most widely used raw material for several high technology applications (Santos et al, 2015;Ashrafi-Shahri et al, 2019). It is a unique material for crystalline silicon manufacturing in panel construction (Dai et al, 2021), transparent silica glass (Chen et al, 2021), cement mixtures (Ramezanianpour et al, 2021) cement mortar, foundry materials (Kumar Sinha et al, 2021), corrosion protection (Ashrafi-Shahri et al, 2019), automotive engineering (sandblasting) (Cai et al, 2016), etc. Silica sand is one of the most important additive materials and it has been considered by many researchers.…”

Section: Introductionmentioning

confidence: 99%