CN100404715C - Hybrid particles reinforced aluminium-based composite material and preparation method thereof - Google Patents

Hybrid particles reinforced aluminium-based composite material and preparation method thereof Download PDF

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CN100404715C
CN100404715C CNB2006100286451A CN200610028645A CN100404715C CN 100404715 C CN100404715 C CN 100404715C CN B2006100286451 A CNB2006100286451 A CN B2006100286451A CN 200610028645 A CN200610028645 A CN 200610028645A CN 100404715 C CN100404715 C CN 100404715C
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sic
aluminium
composite
melt
mixing salt
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CNB2006100286451A
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CN1876866A (en
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马乃恒
吕映宾
王浩伟
李险峰
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上海交通大学
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Abstract

The present invention relates to a hybrid particle reinforced aluminium-based composite material which comprises the components by the weight percentage: 4.5 to 13.0% of Si, 0 to 1.5% of Mg, 0 to 1.5% of Cu, 0 to 1.5% of Ni, 5.0 to 20.0% of SiC, 5.0 to 10.0% of TiB2 and Al as the rest. A preparing method comprises the following steps: an aluminium ingot is melted in a crucible, and then a melt is covered by a covering agent; after heat insulation is carried out to the aluminium melt, a dried K2TiF6 and KBF4 salt mixture is added to the aluminium melt and then is sufficiently agitated, and then a reaction product of the salt mixture is scooped out after reaction is realized; a SiC/Al composite material is added to the melt and then is agitated after being fully melted, and then Si, or Si and Mg, or Si, Mg, Al-Cu and Al-Ni, or Si, Mg and Al-Cu are added to the melt for adjusting chemical compositions; after being made to stand, the melt is poured in an ingot mould. The SiC particles and the TiB2 particles of the present invention are in dispersing distribution in a basal body to solve the defects of the easy sedimentation of the large SiC particles and the low elastic modulus of a single TiB2 particle reinforced aluminium-based composite material so as to further enhance the property of the material.

Description

Aluminium based composite material enhanced by miscellaneous granules and preparation method thereof
Technical field
The present invention relates to the metal-base composites technical field, be in particular a kind of aluminium based composite material enhanced by miscellaneous granules and preparation method thereof.
Background technology
Traditional aluminum matrix composite all is enhanced granule to be applied in the aluminum substrate singlely or single enhanced granule to be generated in aluminum substrate, all there is obvious defects in these two kinds of methods, for example: enhanced granule is applied to the method in the aluminum substrate because enhanced granule is subjected to action of gravity generation sedimentation in preparation and casting process singlely, make particle skewness in matrix material, influenced the performance of aluminum matrix composite; The method that enhanced granule is generated in aluminum substrate is few owing to enhanced granule content, is difficult to the aluminum matrix composite of preparation high elastic coefficient.The miscellaneous granules reinforced composite that the method that combines with reaction in and stirring casting prepares can improve the deficiency of single method preparation, and various strongthener different propertiess can be replenished mutually, produces to mix effect, further improves the performance of material.
Find that by prior art documents Zhao Degang etc. are in " casting " 2004,53 (2): the " (TiB that delivers on the 97-100 2+ SiC)/and the preparation and the mechanical property thereof of ZL109 matrix material ", this article has been introduced with stirring casting and the synthetic method that combines of original position and has been prepared (TiB 2+ SiC)/the ZL109 matrix material, this mixes reinforced composite and increases on hardness and intensity than single phase reinforced composite, but because their prepared less (4%SiC+2%TiB of composite material granular content 2), do not embody TiB 2Particle is to the restraining effect of SiC particles settling, and the more single phase reinforced composite materials of Young's modulus that does not also embody material has raising significantly.
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 and preparation method thereof is provided, make its low and uneven defective of size distribution of Young's modulus that has solved particle enhanced aluminum-based composite material existence in the past, SiC and TiB 2Particle disperse in matrix distributes, and has both solved the easy settled defective of big SiC particle, has solved single TiB again 2The defective that the particle enhanced aluminum-based composite material Young's modulus is not high is improved the performance of material further.
The present invention is achieved by the following technical solutions, hybrid reinforced aluminum-matrix composite material of the present invention, and its composition and weight percent are: Si 4.5-13.0%, Mg 0-1.5%, Cu 0-1.5%, Ni 0-1.5%, SiC5.0-20.0%, TiB 25.0-10.0%, all the other are Al.
The above-mentioned aluminium based composite material enhanced by miscellaneous granules of the present invention is to prepare by the method that the reaction salt method original position generates and stirring casting combines, and concrete steps are as follows:
(1) aluminium ingot is melted the back in crucible and cover melt with insulating covering agent;
(2) molten aluminium insulation back adds the K of drying 2TiF 6, KBF 4Mixing salt and fully stirring, reaction is scooped out the mixing salt reaction product after finishing;
(3) in melt, add the SiC/Al matrix material, treat that its all stirs the fusing back, add Si or Si, Mg or Si, Mg, Al-Cu, Al-Ni or Si then, Mg, Al-Cu adjust chemical ingredients, pour into ingot mould after leaving standstill, and promptly obtain SiC and TiB 2Confusion enhanced aluminum matrix composite.
In the inventive method, described insulating covering agent comprises villaumite and villiaumite, and wherein villaumite is KCl, NaCl, MgCl 2, MgCl 2KCl, villiaumite are Na 2SiF 6, Na 3AlF 6, NaF, KF, these villaumites and villiaumite use separately or any several mixing is used.
In the step (1), the aluminium ingot temperature of fusion is between 680 ℃-750 ℃.
In the step (2), mixing salt K 2TiF 6, KBF 4Both mass ratioes satisfy Ti: the atomic quantity ratio of B is 1: 2, and mixing salt adds temperature between 680 ℃-900 ℃, and mixing salt was 150 ℃-250 ℃ insulation oven dry 2-5 hour.Stirring velocity is 200-400rpm, and churning time is 10-30min, 680 ℃-900 ℃ of whipping temps.
In the step (3), the temperature that adds the SiC/Al matrix material is between 700 ℃-750 ℃, and stirring velocity is 200-400rpm, and churning time is 5-10min, 700 ℃-750 ℃ of whipping temps.The melt dwell temperature is between 680 ℃-750 ℃, and time of repose is 10-30min.
The preparation of method that technology utilization reaction in of the present invention and stirring casting combine mix reinforced composite, SiC and TiB 2The particle surface cleaning combines well with aluminum substrate.The SiC particulate adds the Young's modulus that has increased substantially matrix material, and TiB 2Particulate exists, can greatly suppress the SiC particle in molten aluminium sedimentation, make it in matrix material, to be evenly distributed, for the preparation high performance composite are laid a good foundation.
Embodiment
Provide following example in conjunction with content of the present invention, the present invention done further understanding:
Embodiment 1
Prepared composition is Si 7.0%, and Mg 0.3%, and SiC 5%, TiB 25%, all the other are the miscellaneous granules reinforced composite of aluminium, and process is as follows:
Aluminium ingot fusing back adds KCl, NaCl, Na 3AlF 6Insulating covering agent covers, thermometric after the fusion, and temperature reaches 900 ℃, adds through 2 hours K of 250 ℃ of insulation oven dry 2TiF 6, KBF 4Mixing salt, with the stirring velocity stirring 10min of whipping appts with 400rpm, whipping temp is 900 ℃, scoops out the mixing salt reaction product.After treating that temperature drops to 720 ℃, add the SiC/Al matrix material, all the fusing back is with the stirring velocity stirring 5min of 400rpm to treat it, and whipping temp is 720 ℃.After adding Si, Mg adjustment chemical ingredients, after 750 ℃ leave standstill 10min, pour in the stretching die, promptly get SiC and TiB 2Confusion enhanced aluminum matrix composite.Observe the metallographic structure of matrix material and find that particle is evenly distributed in tissue, do not produce big macrosegregation and microsegregation; By the mechanical property of test through the tensile test bar of T6 processing, the tensile strength that draws material is 315MPa, and Young's modulus is 83GPa.
Embodiment 2
Prepared composition is Si 12.0%, and Mg 1.5%, and Cu 1.0%, and Ni 1.5%, and SiC 10%, TiB 210%, all the other are the miscellaneous granules reinforced composite of aluminium, and process is as follows:
Aluminium ingot fusing back adds KF, MgCl 2The KCl insulating covering agent covers, thermometric after the fusion, and temperature reaches 790 ℃, adds through 3.5 hours K of 200 ℃ of insulation oven dry 2TiF 6, KBF 4Mixing salt, with the stirring velocity stirring 20min of whipping appts with 300rpm, whipping temp is 790 ℃, scoops out the mixing salt reaction product.After treating that temperature drops to 750 ℃, add the SiC/Al matrix material, all the fusing back is with the stirring velocity stirring 10min of 200rpm to treat it, and whipping temp is 750 ℃.After adding Si, Mg, Cu, Ni adjustment chemical ingredients, after 730 ℃ leave standstill 20min, pour in the stretching die, promptly get SiC and TiB 2Confusion enhanced aluminum matrix composite.Observe the metallographic structure of matrix material and find that particle is evenly distributed in tissue, do not produce big macrosegregation and microsegregation; By the mechanical property of test through the tensile test bar of T6 processing, the tensile strength that draws material is 290MPa, and Young's modulus is 105GPa.
Embodiment 3
Prepared composition is Si 4.5%, and Mg 0.45%, and Cu 1.5%, and SiC 20%, TiB 210%, all the other are the miscellaneous granules reinforced composite of aluminium, and process is as follows:
Aluminium ingot fusing back adds MgCl 2, Na 2SiF 6, the NaF insulating covering agent covers, thermometric after the fusion, temperature reaches 750 ℃, adds through 5 hours K of 150 ℃ of insulation oven dry 2TiF 6, KBF 4Mixing salt, with the stirring velocity stirring 30min of whipping appts with 200rpm, whipping temp is 750 ℃, scoops out the mixing salt reaction product.After treating that temperature drops to 730 ℃, add the SiC/Al matrix material, all the fusing back is with the stirring velocity stirring 10min of 300rpm to treat it, and whipping temp is 730 ℃.After adding Si, Mg, Cu adjustment chemical ingredients, after 680 ℃ leave standstill 30min, pour in the stretching die, promptly get SiC and TiB 2Confusion enhanced aluminum matrix composite.Observe the metallographic structure of matrix material and find that particle is evenly distributed in tissue, do not produce big macrosegregation and microsegregation; By the mechanical property of test through the tensile test bar of T6 processing, the tensile strength that draws material is 275MPa, and Young's modulus is 120GPa.
Embodiment 4
Prepared composition is Si 13.0%, and SiC 10%, TiB 25%, all the other are the miscellaneous granules reinforced composite of aluminium, and process is as follows:
Aluminium ingot fusing back adds KF, NaCl, Na 2SiF 6Insulating covering agent covers, thermometric after the fusion, and temperature reaches 850 ℃, adds through 4 hours K of 200 ℃ of insulation oven dry 2TiF 6, KBF 4Mixing salt, with the stirring velocity stirring 20min of whipping appts with 300rpm, whipping temp is 800 ℃, scoops out the mixing salt reaction product.After treating that temperature drops to 720 ℃, add the SiC/Al matrix material, all the fusing back is with the stirring velocity stirring 10min of 300rpm to treat it, and whipping temp is 720 ℃.After adding Si adjustment chemical ingredients, after 730 ℃ leave standstill 20min, pour in the stretching die, promptly get SiC and TiB 2Confusion enhanced aluminum matrix composite.Observe the metallographic structure of matrix material and find that particle is evenly distributed in tissue, do not produce big macrosegregation and microsegregation; By the mechanical property of test through the tensile test bar of T6 processing, the tensile strength that draws material is 300MPa, and Young's modulus is 92GPa.
Embodiment 5
Prepared composition is Si 11.0%, and Mg 1.0%, and Cu 0.5%, and Ni 1.0%, and SiC 5%, TiB 210%, all the other are the miscellaneous granules reinforced composite of aluminium, and process is as follows:
Aluminium ingot fusing back adds KCl, NaF, MgCl 2The KCl insulating covering agent covers, thermometric after the fusion, and temperature reaches 680 ℃, adds through 3.5 hours K of 200 ℃ of insulation oven dry 2TiF 6, KBF 4Mixing salt, with the stirring velocity stirring 20min of whipping appts with 300rpm, whipping temp is 680 ℃, scoops out the mixing salt reaction product.After treating that temperature is raised to 700 ℃, add the SiC/Al matrix material, all the fusing back is with the stirring velocity stirring 8min of 200rpm to treat it, and whipping temp is 700 ℃.After adding Si, Mg, Cu, Ni adjustment chemical ingredients, after 700 ℃ leave standstill 20min, pour in the stretching die, promptly get SiC and TiB 2Confusion enhanced aluminum matrix composite.Observe the metallographic structure of matrix material and find that particle is evenly distributed in tissue, do not produce big macrosegregation and microsegregation; By the mechanical property of test through the tensile test bar of T6 processing, the tensile strength that draws material is 330MPa, and Young's modulus is 90GPa.

Claims (2)

1. aluminium based composite material enhanced by miscellaneous granules, it is characterized in that: its composition and weight percent are: Si 4.5-13.0%, Mg 0-1.5%, Cu 0-1.5%, Ni 0-1.5%, SiC 5.0-20.0%, TiB 25.0-10.0%, all the other are Al.
2. the preparation method of an aluminium based composite material enhanced by miscellaneous granules as claimed in claim 1 is characterized in that, concrete steps are as follows:
(1) aluminium ingot is melted the back in crucible and cover melt with insulating covering agent;
(2) molten aluminium insulation back adds the K of drying 2TiF 6, KBF 4Mixing salt and fully stirring, reaction is scooped out the mixing salt reaction product after finishing;
(3) in melt, add the SiC/Al matrix material, treat that its all stirs the fusing back, add Si or Si, Mg or Si, Mg, Al-Cu, Al-Ni or Si then, Mg, Al-Cu adjust chemical ingredients, pour into ingot mould after leaving standstill, and promptly obtain SiC and TiB 2Confusion enhanced aluminum matrix composite.
In the described step (1), described insulating covering agent is villaumite and/or villiaumite, and wherein villaumite is KCl, NaCl, MgCl 2, MgCl 2KCl, villiaumite are Na 2SiF 6, Na 3AlF 6, NaF, KF, these villaumites and villiaumite use separately or any several mixing is used.
In the described step (2), mixing salt K 2TiF 6, KBF 4Both mass ratioes satisfy Ti: the atomic quantity ratio of B is 1: 2, and mixing salt adds temperature between 680 ℃-900 ℃, and mixing salt was 150 ℃-250 ℃ insulation oven dry 2-5 hour; Stirring velocity is 200-400rpm, and churning time is 10-30min, 680 ℃-900 ℃ of whipping temps.
In the described step (3), the temperature that adds the SiC/Al matrix material is between 700 ℃-750 ℃, and stirring velocity is 200-400rpm, and churning time is 5-10min, 700 ℃-750 ℃ of whipping temps; The melt dwell temperature is between 680 ℃-750 ℃, and time of repose is 10-30min.
CNB2006100286451A 2006-07-06 2006-07-06 Hybrid particles reinforced aluminium-based composite material and preparation method thereof CN100404715C (en)

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