Effects of Zirconia on Crystallization of Glasses with Lepidolite Composition

Kawai, Susumu; Motoyama, Munekazu

doi:10.2109/jcersj.102.360

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“…The flexural strength increases with heat‐treatment temperature from 720° to 850°C because of the randomly oriented and interlocked whisker β‐spodumene crystallites. These crystallites cause crack diversion or blunting, which limits further development of the flaw size, and increases the surface energy of fracture 10–14 . When the whisker β‐spodumene crystallites diameter exceeds the critical values, the bending strength decreases.…”

Section: Resultsmentioning

confidence: 99%

“…Fluorine plays an important role in lithium aluminosilicate glass–ceramics 8,9 . Kawai and Motayama 10,11 and Fang and Wu 12 found that in the LiF–KF(MgF 2 )–Al 2 O 3 –SiO 2 glass system, high‐strength (200 MPa) plate‐like lepidolite crystals can precipitate in the glass–ceramics, while in conventional LAS glass–ceramics the shapes of the crystals are usually typically spherical or equiaxed forms, 3–7 yielding a strength of 100 MPa for β‐quartz and 150 MPa for β‐spodumene.…”

Section: Introductionmentioning

confidence: 99%

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Preparation of Whisker β‐Spodumene Glass–Ceramics

Hu¹,

Li²,

Mao³

2005

Journal of the American Ceramic Society

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β‐spodumene glass–ceramics with a whisker‐like microstructure were prepared from the following materials (in wt%): 64.5 SiO2, 18.0 Al2O3, 4.2 Li2O, 4 ZrO2, and 8 MgF2. Scanning electron microscope (SEM) analysis showed that phase separation in the base glass leads to the formation of a primary crystal phase of MgF2 that promotes the formation of spherical β‐spodumene. Whisker spodumene crystals surrounded by spherical crystals are observed at 720°C after 1 h, and the whisker crystals grow at the cost of spherical crystals with increasing temperature and time. The flexural strengths of the glass–ceramics reach a maximum of 228 MPa after heat treatment at 850°C for 1 h.

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Section: Resultsmentioning

confidence: 99%