Ballistic behavior of alumina with niobia additions

Gomes, Alaelson Vieira; Louro, Luís Henrique Leme; Costa, Chiara

doi:10.1051/jp4:2006134154

Cited by 9 publications

(16 citation statements)

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“…The production of the MAS, total thickness of 25 mm, was made by the union of a 5 mm aluminum alloy plate as third layer, the produced epoxy/piassava composite 10 mm thick as second layer, and a 10 mm Al 2 O 3 + Nb 2 O 5 ceramic tile as first layer. The 5052 H34 aluminum alloy plate was supplied by Metalak Metais Ltd.a (Rio de Janeiro, Brazil), while the Al 2 O 3 + Nb 2 O 5 ceramic tile was produced as reported elsewhere [20]. Schematic illustration of the MAS, as well as its front and top view, are shown in Figure S3.…”

Section: Methodsmentioning

confidence: 99%

Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency

et al. 2021

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Since the mid-2000s, several studies were carried out regarding the development of ballistic resistant materials based on polymeric matrix composites reinforced with natural lignocellulosic fibers (NLFs). The results reported so far are promising and are often comparable to commonly used materials such as KevlarTM, especially when used as an intermediate layer in a multilayer armor system (MAS). However, the most suitable configuration for these polymer composites reinforced with NLFs when subjected to high strain rates still lacks investigation. This work aimed to evaluate four possible arrangements for epoxy matrix composite reinforced with a stiff Brazilian NLF, piassava fiber, regarding energy absorption, and ballistic efficiency. Performance was evaluated against the ballistic impact of high-energy 7.62 mm ammunition. Obtained results were statistically validated by means of analysis of variance (ANOVA) and Tukey’s honest test. Furthermore, the micromechanics associated with the failure of these composites were determined. Energy absorption of the same magnitude as KevlarTM and indentation depth below the limit predicted by NIJ standard were obtained for all conditions.

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Section: Methodsmentioning

confidence: 99%

Influence of Rigid Brazilian Natural Fiber Arrangements in Polymer Composites: Energy Absorption and Ballistic Efficiency

et al. 2021

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“…Estes resultados corroboram os obtidos por MEV, revelando que a adição do biovidro melhorou a sinterabilidade da hidroxiapatita, com a redução da porosidade. Esta otimização pode estar relacionada à formação da fase Ca4Nb2O9, uma vez que outras pesquisas apontaram que a formação de niobatos pode induzir um aumento na densificação em outros sistemas cerâmicos, como os à base de alumina [17,18]. O aumento da densificação é esperado, visto a ocorrência de uma sinterização em presença de fase líquida, proveniente da fusão do biovidro.…”

Section: Densificaçãounclassified

Influência Do Biovidro Niobo-Fosfato Na Sinterabilidade Da Hidroxiapatita

dos¹,

Rocha²,

Vasconcellos³

et al. 2019

ABM Proceedings

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Resumo Neste trabalho, foi produzido um compósito cerâmico à base de hidroxiapatita (HA) e biovidro (BV) niobo-fosfato, objetivando verificar a influência deste último na sinterabilidade da HA. Para tal, foi escolhida a fração de 4% em peso deste biovidro como aditivo à hidroxiapatita, tendo como referência a HA pura. Os materiais foram caracterizados por microscopia eletrônica de varredura, para análise morfológica, e por difração de raios X, para determinação das fases formadas. Além disso, para melhor estudo do efeito desta adição na sinterabilidade, os materiais foram avaliados quanto à retração linear e à densificação.

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“…It represents a relative increase of about 75% with the niobo-phosphate glass additivation. This is due to the better densification of the specimens with a 4 wt% of niobo-phosphate glass and its consequent greater efficiency in eroding the tip of the projectile 14,19,22,23,31 . Besides that, it can also be seen that the steel plates represent a non-significant percentage of energy dissipation, around 3.4%.…”

Section: Ballistic Testsmentioning

confidence: 99%

“…Several additives are used as sintering aid in an attempt to optimizing properties. Among these aids, Nb 2 O 5 (niobium oxide) [11][12][13] is an example of additive for reducing the alumina sintering temperature to 1400-1450 ºC 14,15 .…”

Section: Introductionmentioning

confidence: 99%

“…Due to their high compressive strength and hardness, many ceramic materials are used as the first component in a multilayered armor system. Its main function is to dissipate a significant amount of the projectile energy by means of the fragmentation of the projectile tip as well as by the fragmentation of the ceramic layer 14,[20][21][22][23][24][25] . The second layer, just behind the ceramic, may be either a high strength polymeric fiber, such as aramid, or a high molecular weight polyester, as composed of polymeric matrix composites and fibers.…”

Section: Introductionmentioning

confidence: 99%

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