Diamond/silicon carbide composites sintered under high pressure-high temperature conditions / by Jiang Qian.Show full item record
Title | Diamond/silicon carbide composites sintered under high pressure-high temperature conditions / by Jiang Qian. |
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Author | Qian, Jiang |
Date | 2003 |
Genre | Dissertation |
Degree | Doctor of Philosophy |
Abstract | In this dissertation work, novel bulk diamond composites with nano-size grain and nanocrystalline SiC bonding were sintered under high pressure-high temperature (HP-HT) conditions. While preserving the superior hardness, wear resistance of micron-composites, nano-composites have higher strength and fracture toughness due to effective blocking of microcrack propagation and dislocation movement by the nanocrystalline grains. New preparation method, wet mixing and high-energy ball milling, have been used to make starting materials to avoid the self-stop process due to pore closure in HP-HT liquid phase sintering. Key factors influencing the dynamics of the reaction between diamond and silicon, such as diamond graphitization process, phase composition and stress-strain, were thoroughly studied with Raman spectroscopy, x-ray diffraction, SEM and TEM techniques. Mechanical properties of the composites were characterized by ultrasonic interferometer and microindentation hardness measurements. Nanostructured composites represent a new field of fundamental science and manifest potential application in multiple industries. |
Link | https://repository.tcu.edu/handle/116099117/34138 |
Department | Physics and Astronomy |
Advisor | Zerda, T. Waldek Zhao, Y. |
This item appears in the following Collection(s)
- Doctoral Dissertations [1526]
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