Aluminium based composite material enhanced by miscellaneous granules in situ
Technical field
What the present invention relates to is a kind of alumina-base material of technical field of composite materials, specifically, is a kind of aluminium based composite material enhanced by miscellaneous granules in situ.
Background technology
Traditional aluminum matrix composite is that enhanced granule is applied in the aluminum substrate, particle exists enhanced granule and the matrix wetting property is poor owing to adding in aluminum substrate, surface reaction is difficult to control, and defectives such as enhanced granule skewness have influenced the performance of aluminum matrix composite.Adopt simultaneously and add the particulate complicated process of preparation, cost is higher, is unfavorable for applying.Mix the deficiency that enhancing can improve single enhancing body, make various strongtheners of different nature additional mutually, generation mixes effect can improve the content that strengthens body simultaneously, further improves the performance of material.
Find that by prior art documents the Chinese patent publication number is: 1376805, open day be: 2002.10.30, denomination of invention is: a kind of high-strength in-situ Al-base composition, this matrix material are a kind of in-situ authigenic Al
2O
3, TiB
2Grain-mixing strengthened aluminium-base composite material.This matrix material generates in the product owing to the microcell uneven distribution of reacting powder causes and has fragility phase TiAl
3, influenced performance of composites.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of aluminium based composite material enhanced by miscellaneous granules in situ is provided, what make that it has solved that aluminium based composite material enhanced by miscellaneous granules in the past exists exists fragility mutually and distribution of material uneven defective, AlN and TiB
2Particle disperse in matrix distributes, and has played strengthening effect, and the intensity of matrix and modulus are improved significantly.
The present invention is achieved by the following technical solutions, and component of the present invention and mass percent thereof are: Si3~20%, Mg 0.2~3%, TiB
2Particle 0.1~25%, AlN particle 0.1~10%, surplus are Al.
Described AlN particle and TiB
2The particulate size is at 50~300nm.
Described AlN particle and TiB
2Particle shape is hexagon and rectangular parallelepiped, AlN particle and TiB
2Uniform particles is distributed in the matrix, and the interface is clean.
The present invention adds commercial-purity aluminium in crucible, make the aluminium ingot fusing, covers melt with JZF-03 type high temperature covering agent, is warming up to 850~1100 ℃; With KBF
4, K
2TiF
6Uniform mixing, oven dry adds mixing salt in the melt then, carries out mechanical stirring, uses silica tube to feed N simultaneously in melt
2After reaction finishes, take out to send out and answer slag, add Si, Mg, in melt, add the harmless aluminum refining agent of JZJ type and carry out the degasification refining, take off removing dross, leave standstill then; Be poured into then in the mould, obtain the original position hybrid reinforced aluminum-matrix composite material.
What the invention solves that aluminium based composite material enhanced by miscellaneous granules in the past exists exists fragility phase, the uneven defective of distribution of material.N
2Generate the AlN except participating in reaction, also play the effect of degasification refining and stirring.AlN and TiB
2Particle disperse in matrix distributes, and has played strengthening effect, and the intensity of matrix and modulus are improved significantly.The present invention has good mechanical performance and crystallized ability, can be widely used on requirement high strength, the complex-shaped part of high-modulus, also has a wide range of applications in fields such as aerospace, national defence, industry simultaneously.
Embodiment
Embodiment 1
Component of the present invention and mass percent thereof are: Si 3%, Mg 0.2%, TiB 0.1%2, AlN 0.1%, surplus is Al.
AlN and TiB in matrix material
2The particulate size is at 50~300nm, and particle shape is mainly hexagon and rectangular parallelepiped.Material is evenly fine and close, AlN and TiB
2The enhanced granule disperse is distributed in the matrix, AlN and TiB
2Clean with basal body interface, in conjunction with good.The mechanical property of the matrix material that process T6 handles: σ
b=320MPa, σ
0.2=262MPa, δ=3.4%, E=74GPa.
Embodiment 2
Component of the present invention and mass percent thereof are: Si 10%, Mg 1.5%, TiB
212%, AlN 5%, and surplus is Al.
AlN and TiB
2The particulate size is at 50~300nm, and particle shape is mainly hexagon and rectangular parallelepiped.Material is evenly fine and close, AlN and TiB
2The enhanced granule disperse is distributed in the matrix, AlN and TiB
2Clean with basal body interface, in conjunction with good.Handle the mechanical property of back matrix material: σ through T6
b=347MPa, σ
0.2=290MPa, δ=1.9%, E=84GPa.
Embodiment 3
Component of the present invention and mass percent thereof are: Si 20%, Mg 3%, TiB
225%, AlN 10%, and surplus is Al.
AlN and TiB
2The particulate size is at 50~300nm, and particle shape is mainly hexagon and rectangular parallelepiped.Material is evenly fine and close, AlN and TiB
2The enhanced granule disperse is distributed in the matrix, AlN and TiB
2Clean with basal body interface, in conjunction with good.Handle the mechanical property of back matrix material through T6:: σ
b=361MPa, σ
0.2=305MPa, δ=1.2%, E=92GPa.