CN109868381A - A kind of preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites - Google Patents
A kind of preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites Download PDFInfo
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Abstract
The invention discloses a kind of preparation methods of high-volume fractional tungsten particle reinforced aluminum matrix composites, method includes the following steps: (1) pre-processes tungsten powder in Double cone mixer, obtain pretreatment tungsten powder；(2) pretreatment tungsten powder is mixed according to the ratio with aluminium powder, is uniformly mixed using Double cone mixer, obtains composite granule；(3) composite granule is subjected to cold isostatic compaction, isostatic cool pressing pressure is 50MPa~200MPa, and the dwell time is 10min~40min, obtains isostatic cool pressing billet；(4) it by isostatic cool pressing billet in aluminium jacket, is formed using the method for HIP sintering, obtains hot isostatic pressing state tungsten particle reinforced aluminum matrix composites；(5) obtained hot isostatic pressing state tungsten particle reinforced aluminum matrix composites are placed in high pressure resistant be rapidly heated in testing stand and carry out vacuum isothermal forging and stamping thermal deformation field.Have many advantages, such as that consistency is high, reinforced phase is evenly distributed, comprehensive mechanical property is good using composite material prepared by method of the invention.
Description
Technical field
The present invention relates to a kind of preparation methods of high-volume fractional tungsten particle reinforced aluminum matrix composites, belong to particle enhancing
Aluminum matrix composite preparation technical field.
Background technique
Particle enhanced aluminum-based composite material generally have specific strength is high, specific modulus is high, antifatigue, high temperature creep-resisting, it is heat-resisting,
The advantages such as wearability is good, thermal conductivity is high, the coefficient of expansion is low, ingredient is adjustable, density is low, in Aeronautics and Astronautics, land transportation and electricity
The fields such as sub-information have a wide range of applications.If SiC/Al composite material is in lifting airscrew, electro-optical device bracket
It is applied with fields such as shell, piston of automobile and brake blocks.The materials such as Electronic Packaging, such as B4C/Al composite material is used for core
Fuel stores shelf, and diamond/Al composite material is for thermal management materials etc..
High volume fraction particle reinforced composite mainly utilizes the characteristics of reinforced phase itself, and the special type for meeting high-end devices is answered
With.If 30~70vol%SiC/Al composite material has the advantages that high thermal conductivity and low thermal expansion, answered in Electronic Packaging field
With；Boron thermal neutron absorption cross section with higher, therefore 30~75vol%B4C/Al composite material for nuclear power station shield and it is weary
Fuel stores screen work；Diamond has high thermal conductivity, therefore 40~70vol% diamond/Al composite material is in heat management
Field also has extensive use.
Patent document CN104946911B is prepared for B using the method for Pressure Infiltration4C/Al composite material, patent document
CN107177746A is prepared for SiC using the method for argon gas protection vacuum-sinteringp/ Al alloy composite materials, patent document
It is equal that CN105401001B uses powder mixing-hip moulding method to be prepared for W/Al composite material enhancing phase volume fraction
It can achieve 50% or more.With the increase of enhancing phase volume fraction, the plasticity of composite material is deteriorated, especially high-volume fractional
Aluminum matrix composite, plasticity are generally below 2%, and toughness is also poor, significantly limit the design of composite material, process and answer
With.
Summary of the invention
The purpose of the present invention is being directed to the disadvantage of existing high volume fraction grain enhanced aluminum-base compound material plasticity difference, provide
The composite material of a kind of preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites, this method preparation has consistency
High, the advantages that reinforced phase is evenly distributed, comprehensive mechanical property is good.
To achieve the above object, the invention adopts the following technical scheme:
A kind of preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites, the tungsten particle enhance aluminum-base composite material
The volume content of tungsten particle is 30%~50% in material, remaining is pure aluminum substrate, method includes the following steps:
(1) tungsten powder is placed in Double cone mixer, abrading-ball and powder weight ratio are 1: 1, mixed by mixing medium of ethyl alcohol
Material 10 hours, vacuum drying obtain pretreatment tungsten powder for 10 hours；
(2) pretreatment tungsten powder is mixed with aluminium powder according to the volume proportion of 30%~50% tungsten powder, 70~50% aluminium powders, is made
Powder is uniformly mixed under conditions of argon gas is protected with Double cone mixer, abrading-ball and powder weight ratio are 1: 1, and incorporation time is
10~24 hours, obtain composite granule；
(3) composite granule is subjected to cold isostatic compaction, obtains isostatic cool pressing billet；
(4) by isostatic cool pressing billet in pre-fabricated aluminium jacket, it is lower than 1 × 10 in 400 DEG C, vacuum degree-3Pa's
Condition lower sealing is 500~550 DEG C in temperature, pressure is the condition of 100~200MPa using the method for HIP sintering
It is lower heat preservation 2 hours and furnace cooling realize composite material molding, fall surfaces of aluminum skin using lathe vehicle and obtain hot isostatic pressing state tungsten
Particle enhanced aluminum-based composite material；
(5) obtained hot isostatic pressing state tungsten particle reinforced aluminum matrix composites are placed in the high pressure resistant testing stand that is rapidly heated
In, vacuum degree≤1 × 10 in furnace-2After being warming up to 550 DEG C, heat preservation 2 hours under conditions of Pa with the heating rate of 8 DEG C/min,
Under conditions of 550 DEG C, make it with 0.001s with the pressure forging and stamping blank of 70MPa~200MPa-1~0.01s-1Strain rate
Mushrooming deformation, deflection are 20~50%；Sample cools to room temperature with the furnace after forging.
Preferably, in the step (3), when cold isostatic compaction using rubber package set by hydraulic medium and composite powder every
From isostatic cool pressing pressure is 50MPa~200MPa, and the dwell time is 10min~40min.
Preferably, in the step (4), heating rate is not higher than 10 DEG C/min.
Preferably, the tungsten powder purity is greater than 99%, and partial size (D50) is 7~8 μm.
Preferably, the purity of the aluminium powder is greater than 99.5%, and partial size (D50) is 7~8 μm.
The beneficial effects of the present invention are:
The present invention is optimized by powder diameter, powder is surface-treated and vacuum isothermal Forging Technology, significantly improves height
The comprehensive mechanical properties such as the elongation percentage of volume fraction aluminum matrix composite have expanded the application of high volume fraction particle reinforced composite
Range.Specifically, the present invention is by the proportion optimizing to matrix and reinforced phase powder diameter, reduces matrix and reinforced phase powder
Particle size differences, the static pressure aspect product both macro and micro reinforced phase distributing homogeneity such as guarantee, improve hot isostatic pressing state aluminum-base composite
The heat deformability of material；Dispersion pretreatment is implemented to tungsten powder, so that tungsten powder is become monodispersed graininess by the chain reunited, mentions
The high sintering activity of tungsten powder and the dispersing uniformity in composite inner；Composite material forges and presses thermal change by vacuum isothermal
Shape processing, is greatly improved the elongation percentage of aluminum matrix composite.
The high-volume fractional W/Al composite material consistency prepared through the invention is greater than 99.5%, and room temperature tensile intensity is big
In 220MPa, yield strength is greater than 140MPa, elongation percentage 5~8%, and room temperature impact toughness is greater than 4.5jcm-2, it is a kind of synthesis
The composite material haveing excellent performance has larger application potential.
Detailed description of the invention
Fig. 1 is high-volume fractional tungsten particle reinforced aluminum matrix composites cross-sectional scans Electronic Speculum prepared by the embodiment of the present invention 1
Microstructure picture.
Fig. 2 is high-volume fractional tungsten particle reinforced aluminum matrix composites Fracture scan Electronic Speculum prepared by the embodiment of the present invention 1
Microstructure picture.
Specific embodiment
With reference to the accompanying drawing and the present invention is discussed in detail in specific embodiment.But embodiment below is only limitted to explain this hair
Bright, protection scope of the present invention should include the full content of claim, be not limited only to following embodiment.
Embodiment 1
Tungsten particle reinforced aluminum matrix composites are according to 85% tungsten of mass percent and 15% pure aluminum substrate group in the present embodiment
At (percent by volume is 45% tungsten and 55% pure aluminum substrate), the preparation method of tungsten particle reinforced aluminum matrix composites is by following
What step carried out:
Weighing partial size (D50) is 7~8 μm of tungsten powder 8.5kg, and stainless steel abrading-ball and tungsten powder mass ratio are 1: 1, and ethyl alcohol is mixing
Medium uses Double cone mixer mixing 10 hours, and vacuum drying obtained pre-dispersed processing tungsten powder after 10 hours；Pre-dispersed processing
Tungsten powder 8.5kg is that 7~8 μm of pure aluminium powder 1.5kg are mixed with partial size (D50), using Double cone mixer under conditions of argon gas is protected
Mix 10 hours acquisition composite powders.Hydraulic medium (antiwear hydraulic oil) is isolated with composite powder using rubber package set, is being pressed
Power is that 100MPa realizes the preforming of composite powder under the conditions of the dwell time is the isostatic cool pressing of 25min.Billet is cold-pressed to place
In pre-fabricated aluminium jacket, at 400 DEG C, vacuum degree is lower than 1 × 10-3It is sealed under conditions of Pa, wherein the degasification time is not small
In 10 hours.550 DEG C are warming up to the heating rate of 10 DEG C/min, keeps the temperature 2 under the conditions of pressure is the hot isostatic pressing of 200MPa
Hour.Cool to room temperature with the furnace, vehicle falls surfaces of aluminum skin and obtains hot isostatic pressing state high-volume fractional tungsten particle enhancing aluminum-base composite
Material.By hot isostatic pressing state high-volume fractional tungsten particle reinforced aluminum matrix composites be placed in it is high pressure resistant be rapidly heated in testing stand,
Vacuum degree≤1 × 10 in furnace-2550 DEG C are warming up to the heating rate of 8 DEG C/min under conditions of Pa, and keeps the temperature 2 hours.?
Under conditions of 550 DEG C, make it with 0.001s with the pressure forging and stamping blank of 70MPa~200MPa-1~0.01s-1Strain rate pier
Thick deformation, deflection 27%, sample cools to room temperature with the furnace after forging.Obtained 45vol%W/Al composite material consistency is
99.6%, the section microscopic structure of composite material is referring to Fig. 1, and fracture section microscopic structure is referring to fig. 2, it is seen that microstructure of composite
Densification, reinforced phase are evenly distributed, and composite material room temperature tensile intensity is 256MPa, yield strength 169MPa, and elongation percentage is
5%, impact flexibility 4.5jcm-2。
Embodiment 2
The present embodiment is with 1 difference of embodiment: vacuum isothermal forging deformation is 36%.
Obtained 45vol%W/Al composite material consistency is 99.8%, and composite material room temperature tensile intensity is 250MPa,
Yield strength is 179MPa, elongation percentage 6%, impact flexibility 4.9jcm-2。
Embodiment 3
The present embodiment and the difference of embodiment 1 are: tungsten powder quality is 7.95kg, and pure aluminium powder quality is 2.05kg, very
Empty isothermal forging deflection is 26%.
Obtained 35vol%W/Al composite material consistency is 99.9%, and composite material room temperature tensile intensity is 224MPa,
Yield strength is 148MPa, elongation percentage 7%.
Embodiment 4
The present embodiment and the difference of embodiment 3 are: vacuum isothermal forging deformation is 41%.
Obtained 35vol%W/Al composite material consistency is 99.9%, and composite material room temperature tensile intensity is 225MPa,
Yield strength is 143MPa, elongation percentage 8%.
Claims (5)
1. a kind of preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites, the tungsten particle reinforced aluminum matrix composites
The volume content of middle tungsten particle is 30%~50%, remaining is pure aluminum substrate, which is characterized in that method includes the following steps:
(1) tungsten powder is placed in Double cone mixer, abrading-ball and powder weight ratio are 1: 1, using ethyl alcohol as mixing medium mixing 10
Hour, vacuum drying obtains pretreatment tungsten powder for 10 hours；
(2) pretreatment tungsten powder is mixed with aluminium powder according to the volume proportion of 30%~50% tungsten powder, 70~50% aluminium powders, using double
Powder is uniformly mixed by cone batch mixer under conditions of argon gas is protected, and abrading-ball and powder weight ratio are 1: 1, and incorporation time is 10~
24 hours, obtain composite granule；
(3) composite granule is subjected to cold isostatic compaction, obtains isostatic cool pressing billet；
(4) by isostatic cool pressing billet in pre-fabricated aluminium jacket, it is lower than 1 × 10 in 400 DEG C, vacuum degree-3The condition of Pa
Lower sealing is 500~550 DEG C in temperature, pressure is protected under conditions of being 100~200MPa using the method for HIP sintering
Temperature 2 hours and furnace cooling realize composite material molding, fall surfaces of aluminum skin using lathe vehicle and obtain hot isostatic pressing state tungsten particle
Reinforced aluminum matrix composites；
(5) by obtained hot isostatic pressing state tungsten particle reinforced aluminum matrix composites be placed in it is high pressure resistant be rapidly heated in testing stand,
Vacuum degree≤1 × 10 in furnace-2After being warming up to 550 DEG C, heat preservation 2 hours under conditions of Pa with the heating rate of 8 DEG C/min, 550
Under conditions of DEG C, make it with 0.001s with the pressure forging and stamping blank of 70MPa~200MPa-1~0.01s-1Strain rate it is upset
Deformation, deflection are 20~50%；Sample cools to room temperature with the furnace after forging.
2. the preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites according to claim 1, feature exist
In hydraulic medium being isolated with composite powder using rubber package set when cold isostatic compaction, isostatic cool pressing in the step (3)
Pressure is 50MPa~200MPa, and the dwell time is 10min~40min.
3. the preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites according to claim 1, feature exist
In in the step (4), heating rate is not higher than 10 DEG C/min.
4. the preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites according to claim 1, feature exist
In the tungsten powder purity is greater than 99%, and partial size is 7~8 μm.
5. the preparation method of high-volume fractional tungsten particle reinforced aluminum matrix composites according to claim 1, feature exist
In the purity of the aluminium powder is greater than 99.5%, and partial size is 7~8 μm.
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Cited By (4)
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| CN109706337A (en) * | 2018-12-28 | 2019-05-03 | 有研工程技术研究院有限公司 | A kind of preparation method of tungsten particle reinforced aluminum matrix composites |
| CN114042912A (en) * | 2021-11-12 | 2022-02-15 | 哈尔滨工业大学 | Method for finely controlling mechanical properties of NiAl-based composite material through powder particle size |
| CN114921690A (en) * | 2021-09-30 | 2022-08-19 | 有研工程技术研究院有限公司 | High-energy electron radiation resistant aluminum-based composite shielding material and preparation method thereof |
| CN115896515A (en) * | 2022-12-14 | 2023-04-04 | 西安理工大学 | Preparation method of shell-like W-Al armor material |
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| CN109706337B (en) * | 2018-12-28 | 2020-09-29 | 有研工程技术研究院有限公司 | Preparation method of tungsten particle reinforced aluminum matrix composite material |
| CN114921690A (en) * | 2021-09-30 | 2022-08-19 | 有研工程技术研究院有限公司 | High-energy electron radiation resistant aluminum-based composite shielding material and preparation method thereof |
| CN114042912A (en) * | 2021-11-12 | 2022-02-15 | 哈尔滨工业大学 | Method for finely controlling mechanical properties of NiAl-based composite material through powder particle size |
| CN114042912B (en) * | 2021-11-12 | 2022-07-29 | 哈尔滨工业大学 | Method for finely controlling mechanical properties of NiAl-based composite material through powder particle size |
| CN115896515A (en) * | 2022-12-14 | 2023-04-04 | 西安理工大学 | Preparation method of shell-like W-Al armor material |
| CN115896515B (en) * | 2022-12-14 | 2024-04-12 | 西安理工大学 | Preparation method of shell-like W-Al armor material |
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