کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5437496 | 1398174 | 2017 | 9 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
The effect of processing conditions on phase and microstructure of CaGeO3 ceramics
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
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چکیده انگلیسی
The present study illustrates the effects of processing conditions on phase and microstructure of CaGeO3 ceramics. It is shown that the fabrication of single phase, high density and crack-free CaGeO3 ceramics is particularly challenging using conventional sintering or spark plasma sintering. The main difficulties in achieving single phase are predominantly related to the segregation of an additional phase identified as Ca5Ge3O11, most likely driven by the volatilization of GeO2 during processing at high temperature. This can be mainly suppressed by adding an appropriate excess amount of GeO2. High density can be achieved by conventional sintering and spark plasma sintering (SPS), but in the temperature ranges that lead to the formation of Ca5Ge3O11. The presence of cracks observed in the ceramics is attributed to the development of local residual stresses caused by the anisotropy of the thermal expansion and elastic properties, and it can be avoided under certain SPS conditions.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 15, 15 October 2017, Pages 12035-12043
Journal: Ceramics International - Volume 43, Issue 15, 15 October 2017, Pages 12035-12043
نویسندگان
Giuseppe Viola, Fabiana D'Isanto, Abd El-razek Mahmoud, Michael John Reece, Grzegorz Cempura, Federico Smeacetto, Milena Salvo,