کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
7972842 | 1514622 | 2018 | 22 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Pressureless sintering of TiB2 with low concentration of Co binder to achieve enhanced mechanical properties
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
چکیده انگلیسی
This paper studies the pressureless sintering of TiB2 based materials with a low concentration of 3â¯wt% Co binder to result in enhanced mechanical properties. Utilizing ultra-fine TiB2 powders obtained from a special carbon coated precursors method, TiB2-3â¯wt% Co composite can be densified to a relative density of ~98.6% at a temperature of 1500â¯Â°C without external pressure, which is over ~200â¯Â°C lower than literature reported temperatures. The Co binder partially reacts with TiB2 and converts into Co2B and Ti-B-Co with good wettings with TiB2. Due to the low sintering temperature, the microstructure is fine with a grain size of ~1.75â¯Â±â¯0.16â¯Âµm. The sample also combines superior mechanical properties including Vickers hardness of ~28.4â¯Â±â¯0.6â¯GPa, elastic modulus of ~519.6â¯Â±â¯17.2â¯GPa, indentation fracture toughness of ~7.0â¯Â±â¯0.4â¯MPaâm, and flexural strength of ~638.3â¯Â±â¯34.9â¯MPa. The variation of the Co content to 1, 10, or 20â¯wt% either leads to low relative density (~91.5% for 1â¯wt% Co even at a temperature of 1600â¯Â°C) or deteriorated mechanical properties (the combination of hardness and fracture toughness, for samples containing 10 and 20â¯wt% Co) due to the formation of significant amount of brittle Co2B. Correlations between mechanical properties and microstructure are further discussed.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volume 721, 4 April 2018, Pages 22-27
Journal: Materials Science and Engineering: A - Volume 721, 4 April 2018, Pages 22-27
نویسندگان
Zhezhen Fu, Rasit Koc,