کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
11031021 | 1646090 | 2019 | 33 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Microstructure and mechanical behavior of ternary phase ZrB2-SiC-AlN nanocomposite
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موضوعات مرتبط
مهندسی و علوم پایه
مهندسی مواد
فلزات و آلیاژها
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چکیده انگلیسی
The ZrB2-SiC nano composite was produced in a pressureless sintering method. The micro AlN powder was used as an additive. In order to investigate the effect of the simultaneous presence of nano and micro particles of SiC, the ZrB2 powder with various percentages of nano and micro SiC particles were mechanically milled in a planetary mill for 2â¯h at a speed of 200â¯rpm. The resulting mixture was subjected to an initial hot press at 80â¯Â°C and a pressure of 100â¯MPa and then cold isostatic pressing was done (CIP) and the resulting sample sintered at 2150â¯Â°C. The AlN particles were then added to ZrB2-SiC composite and its microstructure and mechanical properties were evaluated. The results show that by changing the volume percentage of nano SiC particles from 20% to 15% and 5% for the micro particles, the porosity decreases and the density increases. Microstructural analysis and mechanical properties of the samples showed the highest hardness (15.9â¯GPa) and fracture toughness (4.9â¯MPa.m1/2) for the sample with 15 and 5â¯vol% of nano and micro SiC particles respectively. Addition of 7.5â¯vol% of AlN particles resulted to the density of 98.1% and the hardness and toughness values increased to 17.1â¯GPa and 5.7â¯MPa.m1/2.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: International Journal of Refractory Metals and Hard Materials - Volume 78, January 2019, Pages 186-192
Journal: International Journal of Refractory Metals and Hard Materials - Volume 78, January 2019, Pages 186-192
نویسندگان
Zeynab Nasiri, Mehri Mashhadi,