Diamond/silicon carbide composites sintered under high pressure-high temperature conditions / by Jiang Qian.
Qian, Jiang
Qian, Jiang
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Date
2003
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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.
Contents
Subject
Subject(s)
Diamonds, Industrial
Silicon carbide
Composite materials
Sintering
Silicon carbide
Composite materials
Sintering
Research Projects
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Dissertation
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x, 114 leaves : illustrations
Department
Physics and Astronomy