کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1583558 1514893 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Joining of zirconium diboride-based ultra high-temperature ceramic composites using metallic glass interlayers
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد دانش مواد (عمومی)
پیش نمایش صفحه اول مقاله
Joining of zirconium diboride-based ultra high-temperature ceramic composites using metallic glass interlayers
چکیده انگلیسی

Three zirconium diboride (ZrB2)-based ultra-high-temperature ceramic-matrix composites: ZrB2–SCS9–SiC (ZSS), ZrB2–SiC–C (ZSC), and ZrB2–SiC (ZS), were joined to themselves and to commercially pure Ti using two boron-containing amorphous Ni-base braze alloys (MBF-20 and MBF-30). The SEM and EDS examinations of the joint microstructure and interface composition revealed intimate composite-to-braze contact and metallurgically sound joint interfaces. The dissolution of Ti and ZrB2 in molten braze, and redistribution of Zr, Si, Ti and Cr across the joint region was observed. Fine hairline cracks formed in some of the joints due to thermal stresses from joining. The Knoop microhardness measurements revealed a peak hardness of 1600 KHN within the braze region in the ZSS and ZSC composites, and lower (<1000 KHN) hardness within the composites. The incomplete densification of ZSS during composite fabrication, and addition of carbon (and the resulting weakening of interfaces) in ZSC led to low hardness values within these composites in spite of the presence of hard ZrB2 and SiC phases. In contrast, the fully dense, hot-pressed ZrB2–SiC (ZS) composites exhibited high hardness (about 2100 KHN).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Materials Science and Engineering: A - Volumes 460–461, 15 July 2007, Pages 153–162
نویسندگان
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