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首页> 外文期刊>International Journal of Microstructure and Materials Properties >Microstructure and indentation fracture toughness of mica glass ceramics
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Microstructure and indentation fracture toughness of mica glass ceramics

机译：云母玻璃陶瓷的显微组织和压痕断裂韧性

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摘要

Mica glass ceramics were produced through controlled crystallisation of a glass in the SiO_2-Al_2O_3-CaO-MgO-K_2O-MgF system. TiO_2, P_2O_5 and ZrO_2 were added individually as nucleating agents in the amount of 0.5 or 1.0 wt% of the glass. Crystalline phases were identified by X-ray diffraction. The effects of small amounts of various nucleating agents on the microstructure were determined by scanning electron microscopy. Microstructural analyses were supplemented with measurements of the Vickers microhardness and indentation fracture toughness. The amount and kind of nucleating agent did not change the number of crystalline phases present but had an influence on the shape and size of the crystals, and hence on the indentation fracture toughness of the mica glass ceramics. The values for the indentation fracture toughness for the mica glass ceramics containing 0.5 wt% of TiO_2, P_2O_5 and ZrO_2 were 1.69±0.09 MPa.m~(1/2), 1.74 ±0.10 MPa.m~(1/2) and 1.77 ± 0.12 MPa.m~(1/2), respectively.
机译：云母玻璃陶瓷是通过在SiO_2-Al_2O_3-CaO-MgO-K_2O-MgF系统中玻璃的受控结晶生产的。 TiO_2，P_2O_5和ZrO_2作为成核剂的添加量分别为玻璃的0.5或1.0 wt％。通过X射线衍射鉴定结晶相。通过扫描电子显微镜确定了少量各种成核剂对显微结构的影响。微结构分析辅以维氏显微硬度和压痕断裂韧性的测量值。成核剂的量和种类不会改变存在的结晶相的数量，但是会影响晶体的形状和尺寸，从而影响云母玻璃陶瓷的压痕断裂韧性。含有0.5wt％的TiO_2，P_2O_5和ZrO_2的云母玻璃陶瓷的压痕断裂韧性值为1.69±0.09 MPa.m〜（1/2），1.74±0.10 MPa.m〜（1/2）和1.77。分别为±0.12 MPa.m〜（1/2）

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