Effect of zinc oxide on microhardness and sintering behavior of MgO–Al2O3–SiO2 glass–ceramic system
2012; Elsevier BV; Volume: 14; Issue: 4 Linguagem: Inglês
10.1016/j.solidstatesciences.2012.01.010
ISSN1873-3085
AutoresBahman Mirhadi, Behzad Mehdikhani, Nayereh Askari,
Tópico(s)Microwave Dielectric Ceramics Synthesis
ResumoGlass–ceramic in the MgO–Al2O3–SiO2 system with crystallization ability of gahnite (ZnO·Al2O3) and mullite were synthesized. It was found that the glass–ceramic containing gahnite phase had desirable mechanical behavior and reached to an acceptable hardness and density. The compositions were designed based on magnesium oxide replacement (from MgO–Al2O3–SiO2 glass–ceramic system) with zinc oxide. Glass–ceramics were characterized by DTA, X-ray diffraction and scanning electron microscopy. Heat treatment at 1100 °C cause form gahnite crystals in glass–ceramic. Microhardness increased with increasing gahnite crystals. To achieve good mechanical properties, the initially formed high gahnite phase must transform.
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