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首页> 外文期刊>Journal of Materials Engineering and Performance >Sintering Behavior and Machinability of Phlogopite Glass Ceramics Containing Fe_2O_3
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Sintering Behavior and Machinability of Phlogopite Glass Ceramics Containing Fe_2O_3

机译：含Fe_2O_3的金云母玻璃陶瓷的烧结行为和可加工性

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摘要

Mica-based glasses in the SiO_2-Al_2O_3-MgO-K_2O-F system were prepared by a sintering method to investigate the effects of different amounts of hematite (Fe_2O_3) on thermal and sintering behaviors besides machinability of the glasses by means of differential thermal analysis (DTA), X-ray diffraction, and scanning electron microscope techniques. DTA analysis on fine and coarse glass powders indicated that the main crystallization mechanism in this system occurred in the bulk rather than the surface. Increasing Fe_2O_3 content to 5 wt.% improved machinability of the glass ceramic. Fe_2O_3 led to the disruption of the glass matrix and facilitated the nucleation of the crystalline phase. Precipitation of sellite (MgF_2) crystals as heterogeneous nucleating sites for potassium phlogopite crystals acted as a second contribution to the machinability of the 5 wt.% Fe_2O_3-containing sample. However, introducing more than 5 wt.% Fe_2O_3 to the base glass prohibited the nucleation of MgF_2, and as a result, large micas formed within the glass. This together with precipitation of cordierite aggregates in highly doped glass with Fe_2O_3 led to lower machinability in these samples.
机译：采用烧结法制备了SiO_2-Al_2O_3-MgO-K_2O-F体系中的云母基玻璃，通过差热分析，研究了不同赤铁矿（Fe_2O_3）对玻璃加工性能及热性能和烧结性能的影响。 （DTA），X射线衍射和扫描电子显微镜技术。对细和粗玻璃粉的DTA分析表明，该系统的主要结晶机理是发生在块状而非表面。将Fe_2O_3的含量增加至5重量％改善了玻璃陶瓷的机械加工性。 Fe_2O_3导致玻璃基质的破裂，并促进了结晶相的成核作用。作为钾金云母晶体异质成核位点的蝶鞍状（MgF_2）晶体的沉淀是对含5 wt％Fe_2O_3样品的可机械加工性的第二贡献。然而，向基础玻璃中引入超过5重量％的Fe_2O_3阻止了MgF_2的成核，结果，在玻璃内形成了较大的云母。这与堇青石聚集体在具有Fe_2O_3的高掺杂玻璃中的沉淀一起导致这些样品的可加工性降低。

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