کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
5438579 | 1398185 | 2017 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Effects of partial pressure of oxygen on sintering of a ZrO2-30Â mol% Ti powder mixture
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
سرامیک و کامپوزیت
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
A powder mixture of ZrO2-30 mol% Ti was sintered at 1500 °C/h under various controlled partial pressures of oxygen (PaO2). The microstructure of each sintered sample was characterized using x-ray diffractometry and analytical transmission electron microscopy/energy-dispersive spectroscopy. TiO and highly oxygen-deficient zirconia were found after sintering at PaO2 ~2.1Ã10â4 atm, which implies that the oxidation-reduction reaction is a controlling mechanism when there is a trace of residual oxygen. When the PaO2 was increased to 1.05Ã10â1 atm, the dissolution of residual oxygen and nitrogen in the chamber into the titanium led to the formation of TiO(N) with nitrogen in solid solution. It was inferred that the oxygen in TiO(N) was also supplied by zirconia since the zirconia became oxygen-deficient in the sintered composites. After sintering in air (PaO2 ~2.1Ã10â1 atm), TiO2 and TiN were formed along with nearly stoichiometric zirconia, indicating that oxygen and nitrogen in air played a major role in the oxidation and nitridization reaction of titanium. The degree of oxygen deficiency x in ZrO2âx decreased with increasing oxygen partial pressure, which led to an increased volume fraction of the monoclinic phase.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ceramics International - Volume 43, Issue 10, July 2017, Pages 7875-7880
Journal: Ceramics International - Volume 43, Issue 10, July 2017, Pages 7875-7880
نویسندگان
Kun-Lin Lin, Chien-Cheng Lin,