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Preparation and Properties of Porous Si3N4 Reinforced 2024Al Composites

Author: LiuShiChao
Tutor: YeFeng
School: Harbin Institute of Technology
Course: Materials Science
Keywords: Porous Si3N4 ceramics Aluminum matrix composites Mechanical properties Aging
CLC: TB33
Type: Master's thesis
Year: 2010
Downloads: 75
Quote: 0
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Abstract


The pressureless sintering method synthesis of porous Si 3 < / sub > N 4 < / sub > ceramic preform pressure infiltration of liquid aluminum was prepared the Si 3 N 4 / 2024Al composite . Reinforcement content ( 18.8-34.5 vol % ) and aging treatment on the composite microstructure and mechanical properties of the law , to achieve the optimization of the mechanical properties ; determination of the coefficient of thermal expansion and thermal conductivity of the composites and its model calculations . XRD analysis showed that the porous Si 3 N 4 ceramics Si 3 N 4 's alpha > beta transformation of increased with increasing porosity . Si 3 < / sub > N 4 < / Sub > / 2024Al composite microstructure uniformity , macro-defect ; aluminum alloy matrix composite material was striping , fine grain size ; reinforcement particles in a small amount of stacking faults ; aluminum alloy matrix Si 3 N 4 enhance the body 's interface is clean and neat , and the presence of interface reactants . The 495 ° C/1h solid solution 175 ° C aging test results show that , the Si 3 < / sub > N 4 < / sub > / 2024Al composite peak aging time than 2024Al alloy in advance ; precipitated phase away from the Si 3 N 4 enhance the density of the body region , a larger size . Vickers hardness and elastic modulus of the Si 3 N 4 / 2024Al composite composite rule of mixtures . Without aging treatment, composite materials , the tensile strength with enhanced body content increases the trend first increases and then decreases , up to 330 MPa ; fracture toughness with enhanced body content decreases , the bending strength with reinforcement content the increase , the maximum value of 11.3MPa · m1 / 2 and 540MPa , respectively ; body content with enhanced compressive strength increases and the deformation rate of the increase ,10-3S-1 under the conditions of compressive strength of 650MPa . Aging treatment can further improve the tensile strength and flexural strength , 434MPa and 705MPa , respectively , 31.5 % and 30.5 % , respectively, compared to before aging . The Si 3 < / sub > N 4 < / sub > / 2024Al composite material having a low coefficient of thermal expansion and high thermal conductivity, and exhibit the trends with reinforcement content decreases . The test measured the room temperature, thermal expansion coefficient and thermal conductivity ratios were lt ; 4.2 x 10- 6K- 1 and GT ; 90 W · m -1 · K -1 .

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