Physical and mechanical properties of low, ultralow and no cement refractory castables containing MgO nanoparticles developed in situ by means of polymeric resins

AUTOR(ES)

Alves Júnior, J. A.

FONTE

Cerâmica

DATA DE PUBLICAÇÃO

14/11/2019

RESUMO

Resumo A introdução de nanopartículas de MgO desenvolvidas in situ na matriz de concretos refratários de baixo teor de cimento, ultrabaixo e sem cimento foi feita por meio de uma resina polimérica aquosa de baixa viscosidade, produzida pelo método Pechini. A adição da resina líquida aos concretos desempenhou dois papéis: primeiro serviu como fornecedor de água de mistura e segundo como precursor de nanopartículas de MgO, que foram formadas in situ nas matrizes de concretos durante a queima. Os resultados confirmaram os benefícios trazidos pelas nanopartículas de MgO desenvolvidas in situ nas propriedades refratárias dos concretos investigados.Abstract The introduction of MgO nanoparticles developed in situ in the matrix of high-alumina low cement, ultra-low and no cement refractory castables was made by means of a low viscosity containing aqueous polymeric resin, produced by the Pechini method. The addition of the liquid resin to the castables played two roles: first to serve as a supplier of mixing water and second as a precursor of nanoparticles of MgO, which were formed in situ in the castables matrices during firing. The results confirmed the benefits brought by the developed in situ MgO nanoparticles on the refractory properties of the investigated castables.

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