Dibismuth trioxide enveloped ceramic phase reinforced aluminium base composite material

Abstract

The present invention relates to composite material, and aluminum base composite material comprising dibismuth trioxide, reinforcing ceramic phase and aluminum base, the reinforcing ceramic phase accounts for 5-50 vol%, and the added amount of dibismuth trioxide is 2-20 wt% of the reinforcing ceramic phase. The coating dibismuth trioxide is distributed in the interface between the reinforcing body and the base body basically through alumino-thermic reaction with the aluminum base body. During hot deformation of the composite material and after the temperature is higher than the smelting point of bismuth, 270 deg.c, low smelting point bismuth in the interface melts into liquid to act as lubricant between the reinforcing body and the base body, lower the deformation temperature and machining cost, reduce damage to the ceramic phase and maintain excellent mechanical performance of deformed composite material.

Description

Technical field: [0001] The invention relates to a novel composite material, in particular to a bismuth trioxide (Bi 2 o 3 ) reinforced aluminum matrix composites. Background technique: [0002] In recent years, ceramic phase reinforced metals, especially reinforced aluminum matrix composites are receiving widespread attention. The most attractive properties of this material are its excellent properties such as high strength, high modulus and low coefficient of thermal expansion. Much attention has been paid to the potential advantages of ceramic phase-reinforced aluminum matrix composites, and some composites have applications in the automotive, aerospace, astronomical, and general engineering fields. Although commercial applications are emerging, the low plasticity of composite materials is a fatal weakness, and it becomes a difficulty that composite materials cannot be produced by conventional molding methods at room temperature, which seriously restricts the commercia...

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Problems solved by technology

If the composite material is plastically deformed at medium temperature, the matrix is ​​not softened, and the rotation of the reinforcement and the plastic deformation of the matrix cannot be coordinated, which will lead to damage to the reinforcement and seriously reduce the mechanical properties of the composite material; if the liquid close to the matrix at high temperature The solidus carries out the plastic deformation of the composite material, because the matrix has softened at this time, and even a liquid phase appears, the reinforcement is easy to rotate, and the damage is reduced, but because the deformation temperature is close to the liquid-solidus line of the matrix, the distribution of the reinforcement in the matrix is ​​not good. Uniform, "enrichment zone" and "depletion zone" appear, which also reduces the mechanical properties of the material, and also increases the secondary processing cost of the composite material because the deformation temperature is too high

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