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Preparation and Mechanical Property of B-doped Carbon Nanotubes Reinforced Magnesium Matrix Composites

Author: HouZhen
Tutor: ShiChunSheng
School: Tianjin University
Course: Materials Science
Keywords: Carbon nanotubes Magnesium Matrix Composites Boron-doped Interface
CLC: TB333
Type: Master's thesis
Year: 2010
Downloads: 82
Quote: 2
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Abstract


Carbon nanotubes (CNTs) with its high strength, high modulus , overall performance and extremely small size , is recognized as the ideal of the composite reinforcing phase . Combined with a direct impact on the performance of the composite in CNTs reinforced magnesium matrix composite materials , CNTs magnesium matrix interface is . Explore how to improve the CNTs with magnesium matrix interface , on the development of high performance magnesium matrix composites, has important theoretical significance and practical value . In this paper, B 2 O 3 boron source , high temperature directly on the original CNTs doped with boron , and study the effect of temperature on the amount of boron-doped . Prepared by powder metallurgy combined with hot extrusion method CNTs reinforced magnesium matrix composites . Study different CNTs content , the different CNTs types of CNTs / Mg composite microstructure , compressive strength , microhardness , fracture morphology of the composite was observed . Vacuum evaporation prepare the CNTs / Mg film , combined with the thinned sample of the composite material the CNTs with magnesium matrix interface analyzed . The research results show that the experiment was a success on boron- doped CNTs on , and the amount of boron - doped with doped boron temperature rise first and then decreased trend in 1150 ℃ , the largest amount of boron - doped . Boron-doped CNTs / Mg composite compressive strength and microhardness showed a trend first and then decreased with the increase of CNTs content , and in the CNTs content 0.5wt.% The highest value 405.9MPa and 59.4HV . When the CNTs content of boron-doped CNTs / Mg composite performance is better than the original of CNTs / Mg composites . The fracture morphology showed that boron-doped CNTs with magnesium matrix interface is better than the original of CNTs and magnesium matrix interface . TEM observation , the CNTs the boron doped processing , can improve the wettability with the magnesium matrix and improve the interfacial bonding .

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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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