کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1523168 995320 2013 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Combining in situ HT-ESEM observations and dilatometry: An original and fast way to the sintering map of ThO2
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Combining in situ HT-ESEM observations and dilatometry: An original and fast way to the sintering map of ThO2
چکیده انگلیسی

The sintering of ThO2 pellets prepared from the initial precipitation of thorium oxalate was investigated by the means of HT-ESEM observations and dilatometric measurements. On the one hand, the use of environmental microscope allowed the in situ observation of the pellet behaviour during heat treatments between 1250 °C and 1400 °C. Subsequent image analysis led to the determination of local (i.e. at the grain scale) and global (i.e. at the pellet scale) kinetic parameters. Particularly, the average grain size was plotted versus the holding time for the three considered temperatures. On the other hand, analogous experiments were performed by dilatometry and led to monitor both linear shrinkage and density of the samples. On this basis, the combination of the two sets of data allowed us to establish for the first time a sintering map for ThO2. This latter clearly evidenced two different zones driven by densification (d ≤ 92%) then by grain growth (d ≥ 92%) which can be used efficiently to monitor the final microstructure of sintered thorium oxide.

Figure optionsDownload as PowerPoint slideHighlights
► Thorium oxide was prepared from the firing of oxalate precursors.
► Sintering of ThO2 pellets was investigated between 1250 °C and 1400 °C.
► In situ HT-ESEM observations allowed the determination of grain growth kinetics.
► Dilatometric measurements led to the evolution of linear shrinkage and density.
► ThO2 sintering map was built from the combination of HT-ESEM and dilatometry data.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Chemistry and Physics - Volume 137, Issue 3, 15 January 2013, Pages 742–749
نویسندگان
, , , , ,