Title of article
Role of Si3N4 on microstructure and hardness of hot-pressed ZrB2−SiC composites
Author/Authors
Bahararjmand ، Zahra Department of Biophysics - Istanbul University-Cerrahpasa , Khalilzadeh ، Mohammad A. Department of Forest Biomaterials - College of Natural Resources - North Carolina State University , Saberi Movahed ، Farshad Department of Materials Science and Engineering - North Carolina State University , Lee ، Tae Hyung Department of Materials Science and Engineering - Research Institute of Advanced Materials - Seoul National University , Wang ، Jinghan Department of Materials Science and Engineering - Research Institute of Advanced Materials - Seoul National University , Lee ، Sea-hoon Division of Powder/Ceramics Research - Korea Institute of Materials Science , Jang ، Ho Won Department of Materials Science and Engineering - Research Institute of Advanced Materials
From page
34
To page
40
Abstract
The impact of Si3N4 content on the hardness and microstructural developments of ZrB2-SiC material has been investigated thoroughly in the present investigation. Having prepared the raw materials in a jar mill, the ZrB2-SiC samples containing various amounts of Si3N4 were hot-pressed at 1850 °C. Furthermore, XRD, FESEM, and HRTEM were utilized to evaluate the microstructure of samples. The formation of in-situ h-BN was proved by the mentioned methods. Also, it was shown that the Vickers hardness of ZrB2-SiC increases up to 20 GPa in presence of 4.5 wt% Si3N4 which is 3 GPa more than the sample without Si3N4. Results show that the positive effect of increased relative density on hardness is more than the negative effect of h-BN soft phase formation.
Keywords
Hot , pressing , ZrB2 , SiC , Si3N4 , Microstructure , Hardness
Journal title
Synthesis and Sintering
Journal title
Synthesis and Sintering
Record number
2772682
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