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Preparation and Performance Study on SiC_f/Ti Matrix Composites

Author: MaXingHua
Tutor: LiuZhiGuang
School: Harbin Institute of Technology
Course: Materials Processing Engineering
Keywords: SiC fiber reinforced titanium matrix composites Interfacial reaction and interfacial strength Mechanical Properties Slurry with casting
CLC: TB333
Type: Master's thesis
Year: 2010
Downloads: 76
Quote: 0
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Abstract


SiC fiber reinforced titanium matrix composites set SiC fiber high-strength , high rigidity and high creep resistance with titanium and titanium-aluminum compounds damage tolerance in one . Further, the SiC fiber was introduced into the titanium substrate can further reduce the density of the material . Therefore, this lightweight materials that can withstand great mechanical loads at room temperature and high temperature will undoubtedly lead to the great revolution of the engine design and mechanical engineering and other high-tech fields . In this paper, domestic uncoated SiC fibers , TiN coated SiC fibers and Ti - 6Al- 4V foil , foil - fiber - foil prepared SiCf/Ti-6Al-4V and SiCf/TiN/Ti-6Al-4V composite material . Using scanning electron microscopy, energy dispersive spectroscopy to observe and analyze the composite microstructure and interfacial reaction . Results show the preparing state SiCf/Ti-6Al-4V exist interface reaction layer thickness of approximately 0.5μm , while no obvious interface layer SiCf/TiN/Ti-6Al-4V Description TiN play a good barrier coating effect. On the two composites vacuum heat treatment of 960 ° C / 9h/25h , both interfacial reactions are severe with time , and TiN coating Quedui interfacial reaction played a role in promoting . Interface strength of the two composites , the results showed that the uncoated fiber interface strength is higher , up to 205MPa ; the interface SiCf/TiN/Ti-6Al-4V strength 146MPa . In addition, the edge of the interfacial strength of the composite material is lower than the center portion . Composites SiCf/Ti-6Al-4V tensile strength test its strength than the original Ti - 6Al - 4V foil strength increased slightly , but only slightly . The main reason is that the brittle material of the fiber and the matrix produced by the reaction , so that the composite material occurs at the interface of the brittle fracture , in particular the interface reaction surface damage caused by defects such as fibers , resulting in a serious decline in the strength of the fibers in the composite material is plays bearing loads . Explore the slurry zone casting Preparation SiCf / Ti composite materials , fiber and matrix composite good interface , no defects such as \parameters to improve . Comprehensive analysis, the method is a promising and cost- preparation process .

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CLC: > Industrial Technology > General industrial technology > Materials science and engineering > Composite materials > Metal - non-metallic composite materials
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