自增韧锌尖晶石-透辉石微晶玻璃力学性能的研究

Mechanical Properties of Self-Toughening Gahnite-Diopside Glass-Ceramics

本文以SiO2、Al2O3、ZnO、CaO、MgO为主要原料制备锌尖晶石-透辉石体系微晶玻璃,利用自增韧技术提高了该体系微晶玻璃的力学性能。采用正交试验研究各热处理工艺参数对该体系微晶玻璃力学性能的影响,探究了微晶玻璃的晶相比例、微观形貌与其力学性能之间的关系。结果表明,提高透辉石相比例可显著提高微晶玻璃断裂韧性,但比例过高则会降低微晶玻璃抗弯强度,因此制备高韧性、高抗弯强度的微晶玻璃时需要柱状晶体交错和粒状晶体填充其间隙,起到协同强化的作用。基础玻璃经750℃保温2 h+810℃保温2 h+880℃保温2 h+950℃保温2 h后,微晶玻璃断裂韧性达5.1 MPa·m^(1/2),抗弯强度达255 MPa,维氏硬度为8.3 GPa。

Gahnite-diopside glass-ceramics were prepared with SiO2,Al2 O3,ZnO,CaO and MgO as main raw materials,and the mechanical properties of glass-ceramics were improved by self-toughening technology.The influences of heat treatment parameters on the mechanical properties of glass-ceramics were studied by orthogonal test,and the relationships between the proportion of crystal phase,microscopic morphology and mechanical properties of glass-ceramics were discussed.The results show that the fracture toughness of glass-ceramics increases significantly with the increase of diopside phase ratio,but the bending strength of glass-ceramics decreases when diopside phase ratio is too high.Therefore,in order to prepare glass-ceramics with high fracture toughness and bending strength,columnar crystals are required to crisscross and granular crystals are required to fill the gaps,which together play a synergistic strengthening role.When the basic glass with heat treatment at 750℃for 2 h+810℃for 2 h+880℃for 2 h+950℃for 2 h,the fracture toughness of glassceramics can up to 5.1 MPa·m^(1/2),the bending strength can up to 255 MPa,and the vickers hardness is 8.3 GPa.