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The impact of the pressureless infiltration process and heat treatment system The composite of B_4C/Al organization , performance

Author: LeiPan
Tutor: XiaChangQing
School: Central South University
Course: Materials Science
Keywords: The B4C ceramic preform body The composite B4C/A1 material Pressureless Infiltration Heat treatment Microstructure Mechanical properties
CLC: TB33
Type: Master's thesis
Year: 2011
Downloads: 107
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Abstract


Modern armor materials, especially the bulletproof panel material in practical applications need to have good characteristics of light weight, anti-elastic ceramic particle reinforced aluminum matrix composites research and development is the hot spot to solve this problem, especially carbide boron ceramic composite of aluminum and its alloys as the focus of our study. This is because the B4C/Al density and the density of the boron carbide ceramic composites (2.5g · cm-3) substantially at the same level, still has a lightweight the characteristics; B4C/Al composites also because the addition of the metal component , to ensure the composite material of high strength while also has the advantages of high toughness. The main subject of using the Pressureless Infiltration prepared by B4C/Al composite materials, including the B4C / pure Al composites and B4C/2519A of composite materials. Firstly, prepared by different preparation B4C preform, followed by pressure the infiltration preparation B4C/Al composite material, the final composite different heat treatment. Integrated use of X-ray analyzer, optical microscopy, scanning electron microscopy, energy spectrum analyzer and mechanical properties tester equipment on B4C preform and B4C/Al-composite microstructure and mechanical properties of the test and analysis, research the relationship between the material microstructure and properties, draw the following conclusions: (1) no pressure infiltration process preparation B4C/Al of composite, the B4C ceramic preform preparation is the key step of the process. The experiment, preferably of the B4C ceramic preform the optimum system for: molding pressure is 100MPa, select 2min dwell time can be obtained φ = 25mm cylindrical body about 13mm high. The B4C ceramic preform particles are closely linked, and the average density in the range of 52% to 56%. (2) the B4C ceramic preform optimum sintering temperature can be determined as 1750 ° C. B4C ceramic preform is sintered at this temperature for completely internal grain bonded to each other, and the overall distribution uniformity, forming a three-dimensional continuous network structure communicate with each other, and provided an important condition for the full impregnation of the metal. By 1750 ℃ ??burn-B4C ceramic preform average density of 55.0%. (3) a size of 100 × 100 × 13mm B4C ceramic preform was prepared according to the molding pressure and dwell time on the density of the preform can be appropriately raise the molding pressure, to extend the dwell time. In this study, an appropriate extension of the dwell time for 3 min, while maintaining the molding pressure of 100MPa pressing process to prepare the ideal B4C ceramic preform. (4) by a microscopic X-ray diffraction (XRD) analysis, scanning electron microscopy (SEM) observation and spectroscopy (EDS) analysis showed: aluminum metal infiltrated the boron carbide preform, B4C and Al react at high temperatures, mainly generated AlB2 the phase and Al3BC phase. The AlB2 mainly generated in B4C / pure Al composites, followed by Al3BC phase; in B4C/2519A composite main generate Al3BC phase. (5) heat treatment process on microstructure and properties of the composites B4C/Al has important implications. After heat treatment, the phase composition in the B4C/Al composite A13BC, AlB2, B4C and Al phase. Studies show that, with the heat treatment temperature increases, the heat treatment time is extended, the composite material Al3BC phase content increased gradually AlB2 phase content is gradually reduced. 900 ℃ × 25h heat treatment after, B4C/2519A composites mainly generated phase was Al3BC the AlB2 phase mainly generated after 700 ° C × 25h heat treatment phase. (6) the use of boron carbide powder forming B4C preform of 100MPa 2min technology cold-pressed, sintered at 1750 ℃, 1200 ℃ × 2h the pressureless infiltration aluminum melt, last B4C/2519A composite prepared by 900 ° C × 25h heat treatment process material density of 2.75 g cm-3, hardness (HRC) 65.0 flexural strength 278.37MPa. Higher than the same prepared by the B4C / pure Al composites corresponding mechanical properties values. (7) B4C/2519A composite fracture toughness value of 2.87 MPa-m1 / 2, compared with B4C / pure Al composites with good toughness.

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