Preparation And Properties Of MgO-Al₂O₃-SiO₂ Glass-ceramics

Glass-ceramics, also known as (Glass Ceramics), as a new functional materials and structural materials, for its excellent optical, electrical, magnetic, biological, and chemical properties in micro-electronics technology, biomedical, defense advanced technology, machinery manufacturing and other fields have been widely used. Cordierite-based glass-ceramic is a high-strength glass-ceramics. Because of its low production costs, abundant raw materials, low dielectric constant, low coefficient of thermal expansion, high mechanical strength and good electrical insulation properties, is considered promising engineering materials and dielectric materials widely used Therefore, in it's research and application development has been very active. In this paper, the application of deep-sea buoyancy material against the backdrop of glass beads, to explore a high-strength glass-ceramic filler as a buoyancy material—glass-ceramic beads preparation materials, to increase the use of the depth of the buoyancy material.In this paper, MgO-Al₂O₃-SiO₂ based glass composition, the system studied the system and the preparation of glass crystallization behavior; discussed the nucleating agent of the Department of the glass crystallization properties; analysis of nuclear and chemical in different time ,nucleation temperature, crystallization time, crystallization temperature under the glass-ceramic materials have mechanical properties and microstructure; and come to the preparation of high-performance glass-ceramic process parameters better.The results show that the glass in MgO-Al₂O₃-SiO₂/B₂O₃ have relatively low melting temperature, suitable for glass-ceramic prepared by melting; ZrO₂-TiO₂ composite nucleating agent on the MgO-Al₂O₃-SiO₂ glass with the crystallization role in promoting effective use of ratio (2% ZrO₂ +3% TiO₂) composite nucleating agent prepared MgO-Al₂O₃-SiO₂ glass-ceramics department, the main crystalline phase for theα-cordierite, and small grains, uniform and is conducive to the improvement of strength of glass-ceramics; nucleation temperature, nucleation time and crystallization temperature, crystallization time on the mechanical properties of glass-ceramics have a strong impact; of MgO-Al₂O₃-SiO₂ glass, mixing (2% ZrO₂ +3% TiO₂) for the crystal nucleating agent, in 1550℃under the glass prepared by melt the sample, the sample in 600℃, 4h nuclear and chemical processing, in 1100℃, 4h crystallization treatment, get better performance with the cordierite-based glass-ceramics, and its flexural strength is 182MPa, Vickers hardness is 12.89 GPa, fracture toughness is 6.61 MPam^1/2.