高能球磨对Li2O-Al2O3-SiO2微晶玻璃粉体粒度及结晶的影响

摘要

通过高能球磨的方法对Li2O-Al2O3-SiO2微晶玻璃粉体细化,研究不同球磨时间对粉体粒度的影响.通过激光粒度分析仪、XRD、SEM、DSC、万能试验机等测试方法,对粉体的粒度,微晶玻璃的晶相、形貌、抗弯强度等进行表征.研究结果表明:高能磨75 min后,得到的粉体粒径为358 nm,其结晶温度比原始粉体的结晶温度降低了约50 ℃,并且球磨后得到的超细粉体在850 ℃ 烧结后,其抗弯强度达到61.67 MPa, 比没有经过高能球磨的原始粉体烧结后样品的强度提升了近40%.%Fine Li2O-Al2O3-SiO2(LAS) glass ceramics particles were crushed by high energy ball milling. The effect of the milling time on the particle size of LAS glass ceramics was investigated. Particle-size analyser, X-ray diffraction and scanning electron microscopy are used to characterize the particle size, phase and microstructure of the LAS glass ceramics. Meanwhile, the flexural strength of the sintered LAS glass ceramics were considered too. It's found that the particle size of LAS can be decreased to 358 nm after milled 75 min by high energy ball milling. The crystallization temperature of fine LAS glass ceramics powder is 50 oC lower than that of initial powder. The crystal phase is β-spodumene for the LAS sintered at 850 ℃. The bending strength of sintered LAS is 61.67 MPa, which is about 40% higher than that of specimens made from raw powder.