نتایج جستجو برای: zrb2
تعداد نتایج: 406 فیلتر نتایج به سال:
The elevated temperature thermal properties of zirconium diboride ceramics containing boron carbide additions up to 15 vol% were investigated using a combined experimental and modeling approach. addition B4C led decrease in the ZrB2 grain size from 22 µm for nominally pure 5.4 B4C. measured room conductivity decreased 93 W/m·K 80 also as increased. For ZrB2, was 67 at 2000 °C compared 55 A mode...
Refractory transition-metal (TM) diborides have high melting points, excellent hardness, and good chemical stability. However, these properties are not sufficient for applications involving extreme environments that require mechanical strength as well oxidation corrosion resistance. Here, we study the effect of Cr addition on ZrB2-rich Zr1-xCrxBy thin films grown by hybrid high-power impulse dc...
In this study, the effect of Al2O3 addition as a diluent during mechanically activated self-propagating high temperature synthesis (MASHS) of Al2O3-ZrB2 composite was investigated. For this purpose, the thermite mixture of Al, ZrO2, H3BO3 and different amounts of Al2O3 (0, 3, 6, 9 wt.%) were used as the raw materials and mechanically activated for 5 h, then furnace sintering was performed at 65...
در این تحقیق، کامپوزیت zrb2-hfb2 به روش تف جوشی بدون فشار تولید و از پودرهای sic، mosi2 و b4c به عنوان افزودنی استفاده شد. برای ساخت نمونه های کامپوزیتی، ابتدا پودر zrb2 به مدت 2 ساعت آسیاب و سپس ذرات تقویت کننده به آن اضافه شد. مخلوط کامپوزیتی حاصل با استفاده از فرایندپرس هم فشار سرد (cip) شکل داده شد و پس از پیرولیز، در دو دمای oc2100 و oc2150 تحت عملیات تف جوشی قرار گرفت. برای مقایسه اثرات ا...
A comprehensive ab initio analysis of the ultra high temperature ceramics ZrB2 and HfB2 is presented. Density functional theory (DFT) computations were performed for the electronic, mechanical, thermal, and point defect properties of these materials. Lattice constants and elastic constants were determined. Computations of the electronic density of states, band structure, electron localization f...
Ceramic borides, carbides and nitrides with high melting point, relatively good resistance to oxidation and corrosive environments are considered by many researchers in various high temperature industries, which is known from the family of materials as high temperature ceramic (UHTC). To be. All UHTCs have very strong bonds that give them structural stability at high temperatures, and among the...
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