High‐Temperature Mechanical Behavior of Stoichiometric Magnesium Spinel

Abstract

The elastic and mechanical behavior, from room temperature up to 13OO0C, of stoichiometric polycrystalline magnesium aluminum spinel is studied. Elastic modulus, fracture toughness, and modulus of rupture measurements and observations of polished and fracture surfaces have been performed. Two well-differentiated regions of fracture behavior as a function of temperature have been found. In the low-temperature region, this material behaves elastically, whereas in the high-temperature (>80OoC) region, plastic phenomena take place.

Preparação e caracterização de espinélio MgAl2O4 nanoestruturado através de síntese por combustão em solução

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INTRODUÇÃOO espinélio de alumínio e magnésio, MgAl 2 O 4 (MA), é um material que tem sido largamente utilizado para variadas aplicações [1][2][3]. O alto ponto de fusão (2135 °C), a resistência mecânica em altas temperaturas, inércia química e boa resistência ao choque térmico são propriedades consideráveis que conferem a aplicabilidade do MA na metalurgia, eletroquímica, radiotecnologia e outros campos industriais [4,5], como os relatados na literatura: material transparente ao infravermelho (infrared window material), variedade de aplicações na indústria nuclear, incluindo novos tipos de reatores nucleares, potencial de acomodar resíduos de cerâmica, e placas cerâmicas de circuitos integrados em compósitos de vidro de borossilicato [6].

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Synthesis and Characterization of a Nanorefractory Dimetaloxide Spinel

“…Magnesium aluminate spinel has received a great deal of attention because of its unique technologically important properties such as high melting point, high mechanical strength at elevated temperatures, high chemical inertness, and good thermal shock resistance [1][2][3]. Because of these properties, the MgAl 2 O 4 spinel has extensively been used for various purposes such as refractory material and humidity sensor in metallurgical, chemical, electro technical, catalysis and electronic industries [4,5].…”

Synthesis, characterization and ionic conductivity of MgAl2O4

“…Thanks to its high thermal stability (melting point at 2135 °C), high hardness (16 GPa), high mechanical resistance, high resistance against chemical attack, wide band gap energy, high electrical resistivity, relatively low thermal expansion coefficient (9.10 -6 1/°C) between 30 and 1400 °C, low dielectric constant (ε = 7.5), low density 3.58 g/cm 3 , high thermal shock resistance, hydrophobicity and low surface acidity, MgAl2O4 has been widely used in various applications such as in metallurgical, electrochemical, radiotechnical and chemical industrial fields [3][4][5][6][7][8][9][10].…”