کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1475040 991107 2014 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Densification behaviour and microstructural development in undoped yttria prepared by flash-sintering
ترجمه فارسی عنوان
رفتار ضریب نفوذ و ساختار میکروساختار در اتریتی بدون الیه تهیه شده توسط فلزی پخت
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد سرامیک و کامپوزیت
چکیده انگلیسی

Conventional sintering of undoped Y2O3 requires temperatures above 1400 °C for a few hours. We show that it can be sintered nearly instantaneously to nearly full density at furnace temperature of 1133 °C under a DC applied field of 500 V/cm. At 1000 V/cm sintering occurs at 985 °C. The FLASH event, when sintering occurs abruptly, is preceded by gradually accelerated field-assisted sintering (FAST). This hybrid behaviour differs from earlier work on yttria-stabilized zirconia where all shrinkage occurred in the flash mode. The microstructure of flash-sintered specimens indicated that densification was accompanied by rapid grain growth. The single-phase nature of flash-sintered Y2O3 was confirmed by high-resolution transmission electron microscopy. The non-linear rise in conductivity accompanying the flash led to Joule heating. It is postulated that densification and grain growth were enhanced by accelerated solid-state diffusion, resulting from both Joule heating and the generation of defects under the applied field.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of the European Ceramic Society - Volume 34, Issue 4, April 2014, Pages 991–1000
نویسندگان
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