CN109280794A - Vacuum pressure infiltration prepares multilayer accumulation magnesium-based composite material used for electronic packaging - Google Patents
Vacuum pressure infiltration prepares multilayer accumulation magnesium-based composite material used for electronic packaging Download PDFInfo
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- CN109280794A CN109280794A CN201811207719.7A CN201811207719A CN109280794A CN 109280794 A CN109280794 A CN 109280794A CN 201811207719 A CN201811207719 A CN 201811207719A CN 109280794 A CN109280794 A CN 109280794A
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- precast body
- multilayer
- composite material
- magnesium
- based composite
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C1/00—Making non-ferrous alloys
- C22C1/04—Making non-ferrous alloys by powder metallurgy
- C22C1/05—Mixtures of metal powder with non-metallic powder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F3/00—Manufacture of workpieces or articles from metallic powder characterised by the manner of compacting or sintering; Apparatus specially adapted therefor ; Presses and furnaces
- B22F3/24—After-treatment of workpieces or articles
- B22F3/26—Impregnating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22F—WORKING METALLIC POWDER; MANUFACTURE OF ARTICLES FROM METALLIC POWDER; MAKING METALLIC POWDER; APPARATUS OR DEVICES SPECIALLY ADAPTED FOR METALLIC POWDER
- B22F7/00—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression
- B22F7/002—Manufacture of composite layers, workpieces, or articles, comprising metallic powder, by sintering the powder, with or without compacting wherein at least one part is obtained by sintering or compression of porous nature
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C23/00—Alloys based on magnesium
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Composite Materials (AREA)
- Ceramic Products (AREA)
- Manufacture Of Alloys Or Alloy Compounds (AREA)
Abstract
The present invention relates to a kind of vacuum pressure infiltration preparation process of multilayer accumulation SiC particulate enhancing magnesium-based composite material used for electronic packaging, the material is realized essentially according to following technique and is prepared.Step 1: the preparation of SiC precast body.The precast body blank that SiCp content is Avol%, Bvol%, Cvol% and Dvol% is prepared by the content of control pore creating material first.Secondly the precast body blank of four different volumes scores is assembled in a mold and be further press-forming into multilayer and accumulate precast body blank.Then multilayer accumulation precast body blank is sintered into reinforcement volume fraction different porous preform.Step 2: the multilayer sintered is accumulated into precast body blank and magnesium alloy is put into togerther in vacuum pressure infiltration device and is prepared into multilayer accumulation magnesium-based composite material.Step 3: solidification is oriented to eliminate casting flaw to the multilayer accumulation magnesium-based composite material prepared.
Description
Technical field
The present invention relates to a kind of vacuum pressure infiltration systems of multilayer accumulation SiCp enhancing magnesium-based composite material used for electronic packaging
Standby technique
Background technique
In recent years, with the rapid development of acoustic image computer communication industry and the progress of digitizing technique, all kinds of digitlization electricity
Sub- product continuously emerges, and various portable electrics occur in electronic device forward direction Highgrade integration and the development of frivolous miniaturization
Sub- equipment.Increasingly higher demands are proposed to electronic equipment shell, electronic equipment shell has been manufactured using engineering plastics
It is difficult to meet these requirements.And under the surging environment of environmental consciousness, magnesium alloy and irretrievable plus nanocarbon/metal powder modeling
Material, or compared with the flame retardant plastics containing toxic fire retardant, there is very big advantage.Magnesium alloy have density is small, specific strength and
The advantages that specific stiffness is high and casting thin-wall is functional, simultaneously as magnesium alloy thermal conductivity is good, electromagnetic shielding capability is strong, subtracts
Vibration property is good and can recycle, its application in electronic equipment is made to have obtained quick growth.But magnesium alloy high temperature power
Performance is not high and room temperature wearability is poor, in order to overcome these limitations to have developed magnesium-based composite material.SiC particulate hardness
High, wearability is good and shock resistance, antioxygenic property height, and SiC particulate is good and from a wealth of sources with magnesium matrix wetability, price
Cheaply, it is used to prepare magnesium-based composite material with good industrial prospect as reinforcement.SiC particulate is compound with magnesium alloy
After particle reinforced magnesium base compound material, material is provided with the advantage of magnesium and SiC respectively, i.e. high heat conductance, low thermal expansion system
Number, high intensity, low-density, high elastic modulus, damping property be good, electrically conductive etc., these characteristics almost represent ideal encapsulation
The all properties requirement of material.
Vacuum gas pressure infiltration is usually used in vacuum pressure infiltration method.Under pressure, by liquid metal be pressed by
In porous preform made of reinforcement, to prepare metal-base composites.The manufacturing process overcome pressure-free impregnation and
The shortcomings that Pressure Infiltration, forming pressure range is big, widely applicable, can direct forming.Shape, size, the content of reinforcement material
It is small that influence is shaped on it, can be obtained the part of near-net-shape and can be prepared the metal-base composites of high-volume fractional.
Summary of the invention
The present invention relates to a kind of vacuum pressure infiltration systems of multilayer accumulation SiCp enhancing magnesium-based composite material used for electronic packaging
Standby technique.Increase for improving low-intensity, soft, low wearability, high thermal expansion coefficient and the high body point rate SiCp of magnesium alloy
Strong magnesium-based composite material moulding is poor, the mechanical deficiencies of easy brittle failure in bending deformation.The present invention is accumulated prefabricated by preparation multilayer
Body blank prepares the multilayer accumulation SiCp enhancing magnesium-based composite material of near-net-shape using vacuum pressure infiltration technique.It will be high
SiC body point rate composite material improves the wear-resisting property of material as fitting surface, divides rate composite material as main low SiC body
Deformed area, to improve the non-deformability of entire material.
In order to solve the above-mentioned mechanical deficiencies of magnesium alloy and traditional magnesium-based composite material, present invention firstly provides a kind of more
The vacuum pressure infiltration process of preparing of layer accumulation SiCp enhancing magnesium-based composite material, its main feature is that being realized using following steps
:
Step 1: stock: SiC particulate being put into the HF solution that mass fraction is 5%~10% and impregnates the regular hour,
Then being washed repeatedly with distilled water to PH is 7.Dehydrated alcohol is added later to be cleaned by ultrasonic, is finally put into baking oven and dries.
The pore creating material, high-temperature agglomerant, low temperature bonding of certain mass are weighed according to the volume fraction of SiC particulate in prepared composite material
Agent and magnesium alloy.
Step 2: mixing: by certain mass ratio through step 1 processed SiC particulate, pore creating material, high-temperature agglomerant,
Low temperature bonding agent, which is put into dry-powder mixer, to be mixed.Mixed material is then taken out, suitable distilled water is added, uses electric blender
Continue to stir, uniform precast body slurry is made.
Step 3: base: mixed precast body slurry is put into precast body crude green body mold, to upper mold apply 60~
The pressure and pressure maintaining 30S of 80MPa, the precast body base for being Avol% by the SiCp content that precast body slurry is pressed into thin sheet form
Material.
Step 4: step 2 and step 3 is repeated several times, preparation SiCp content is respectively Bvol%, Cvol% and Dvol%
Precast body blank.
Step 5: the precast body blank of Avol%, Bvol%, Cvol% and Dvol% are pressed into volume fraction group from low to high
It loads, is put into multilayer precast body shaping dies, apply the pressure of 180~200MPa to upper mold, Bidirectional-pressure is by blank pressure
It is real.
Step 6: the multilayer prepared accumulation precast body blank is put into 80 DEG C of baking oven dry 2h, is put into electricity later
It hinders in furnace and is heated by specific heating curve, is dehydrated, dumping, and sinter the different porous preforming of reinforcement volume fraction into
Body.
Step 7: the multilayer sintered is accumulated into precast body blank and magnesium alloy is put into vacuum pressure infiltration device.It takes out
Vacuum to 10pa hereinafter, plus be evacuated to 10pa again hereinafter, being repeated 4 times after argon gas, be finally evacuated to 10pa or less.Then will
Multilayer accumulation precast body blank and magnesium alloy are heated to 680 DEG C and keep the temperature 10 minutes, lead to argon gas later to 1~3Mpa and pressure maintaining 10
Minute, multilayer accumulation SiC particulate enhancing magnesium-based composite material is made.
Step 8: after pressure maintaining, the multilayer accumulation SiC particulate enhancing magnesium-based composite material infiltrated is oriented solidifying
Gu to eliminate casting flaw.
The beneficial effects of the present invention are:
1, the SiC precast body is mainly by micron order SiC particulate and the high temperature bond dosage form for being bonded together SiC particulate
At stephanoporate framework, have some strength；Pore creating material decomposes completely during being sintered dumping, does not introduce remaining into material
Impurity；Pore creating material volatilization is formed by gas and has dredged SiC particulate skeleton channel, ensure that the stream of liquid magnesium alloy in infiltration process
It is logical；Multilayer accumulation SiC precast body is composed of under stress the different SiC precast body of porosity.During the sintering process, pore-creating
Agent is gradually decomposed, so that the SiC precast body of different porosities automatically forms, apparent interface is not present, to obtain up and down not
With SiC particulate volume fraction and integrated precast body.And then obtain the magnesium-based composite material of different SiC particulate volume fractions.
Can be once-forming with the composite material that this method prepares different reinforcement volume fractions, different reinforcement volume fractions it is compound
Without apparent interface between material, it is well combined and intensity is high.
2, directional solidification processing has been carried out when multilayer accumulation SiCp enhancing magnesium-based composite material cools down during the preparation process, has been disappeared
In addition to the casting flaws such as shrinkage cavity and porosity in tissue.
3, multilayer accumulation SiCp enhancing magnesium-based composite material improves high body point rate SiCp enhancing magnesium-based composite material moulding
Difference, the mechanical deficiencies of easy brittle failure in bending deformation.Make the main deformed area of low body point rate SiCp composite material, to improve
The non-deformability of material.
4, multilayer accumulation SiCp enhancing magnesium-based composite material can be used in Electronic Packaging, and high body divides rate SiCp enhancing magnesium-based multiple
Condensation material can obtain the performances such as high hardness, intensity, wearability, low thermal coefficient of expansion, and low body point rate SiCp composite material has
Help the welding in electronic packing part later period.
Detailed description of the invention
Figure one is the preparation mold schematic diagram of single layer precast body blank；Figure two is that multilayer accumulates precast body blank compacting tool set
And blank schematic diagram, mould structure mainly have upper die and lower die and side form；Figure three is vacuum pressure infiltration schematic device, mainly
Precast body 6,7 and of graphite crucible are accumulated by vacuum evacuation device 1, logical argon gas device 2, magnesium alloy 3, alundum tube 4, resistance wire 5, multilayer
Protective shell 8 forms；Figure four is precast body sintering curre.
Specific embodiment
Specific embodiment 1: illustrating vacuum pressure infiltration preparation multilayer accumulation SiC particulate enhancing in conjunction with Fig. 1-Fig. 4
The specific preparation process of magnesium-based composite material:
Step 1: stock: SiC particulate being put into the HF solution that mass fraction is 5%~10% and impregnates the regular hour,
Then being washed repeatedly with distilled water to PH is 7.Later be added dehydrated alcohol be cleaned by ultrasonic, be finally put into baking oven dry it is standby
With.Suitable SiC particulate, high-temperature agglomerant, low temperature bonding agent and pore creating material are weighed by the mass ratio of 10:1:5:5.
Step 2: mixing: load weighted SiC particulate, pore creating material, high-temperature agglomerant, low temperature bonding agent are put into dry powder and mixed
It is mixed in material machine.Mixed material is then taken out, suitable distilled water is added, continues to stir with electric blender, is made uniform
Precast body slurry.
Step 3: base: mixed precast body slurry is put into precast body crude green body mold, to upper mold apply 60~
The pressure and pressure maintaining 30S of 80MPa, the precast body base for being 30vol% by the SiCp content that precast body slurry is pressed into thin sheet form
Material.
Step 4: it is weighed by the mass ratio of 9:1:2.5:3 suitable through the processed SiC particulate of step 1, high temperature bond
Agent, low temperature bonding agent and pore creating material.Step 2 and step 3 are repeated, the precast body blank that SiCp content is 40vol% is prepared.
Step 5: it is weighed by the mass ratio of 11:1:2:2 suitable through the processed SiC particulate of step 1, high temperature bond
Agent, low temperature bonding agent and pore creating material.Step 2 and step 3 are repeated, the precast body blank that SiCp content is 50vol% is prepared.
Step 6: it is weighed by the mass ratio of 13:1:1.6:1.6 suitable viscous through the processed SiC particulate of step 1, high temperature
Tie agent, low temperature bonding agent and pore creating material.Step 2 and step 3 are repeated, the precast body blank that SiCp content is 60vol% is prepared.
Step 7: by the precast body blank of 30vol%, 40vol%, 50vol% and 60vol% by volume fraction by as low as
Height assembles, and is put into multilayer precast body shaping dies, applies the pressure of 180~200MPa to upper mold, and Bidirectional-pressure is by base
Material compacting.
Step 8: the multilayer prepared accumulation precast body blank is put into 80 DEG C of baking oven dry 2h, is put into electricity later
It hinders in furnace by the heating of heating curve shown in figure four, is dehydrated, dumping, and sinter different porous of reinforcement volume fraction into
Precast body.
Step 9: the multilayer sintered is accumulated into precast body blank and magnesium alloy is put into vacuum pressure infiltration shown in figure three
In device.Be evacuated to 10pa hereinafter, plus be evacuated to 10pa again after argon gas hereinafter, being repeated 4 times, be finally evacuated to 10pa with
Under.Then multilayer precast body blank and magnesium alloy is accumulated to be heated to 680 DEG C and keep the temperature 10 minutes, lead to later argon gas to 1~
3Mpa simultaneously pressure maintaining 10 minutes, multilayer accumulation SiC particulate enhancing magnesium-based composite material is made.
Step 10: after pressure maintaining, the multilayer accumulation SiC particulate enhancing magnesium-based composite material infiltrated is oriented solidifying
Gu to eliminate casting flaw.
Magnesium alloy described in present embodiment is AZ91D magnesium alloy, and high-temperature agglomerant is sodium metasilicate, low temperature bonding agent
For polyvinyl alcohol, pore creating material is that (polyvinyl alcohol can be not only used for low temperature bonding agent can be used for again for polyvinyl alcohol and modified corn starch
Pore creating material).
Claims (4)
1. multilayer accumulate SiC particulate enhancing magnesium-based composite material vacuum pressure infiltration preparation process, feature mainly include with
Lower step:
Step 1: stock: SiC particulate is put into the HF solution that mass fraction is 5%~10% and is impregnated the regular hour, then
Being washed repeatedly with distilled water to PH is 7.Dehydrated alcohol is added later to be cleaned by ultrasonic, is finally put into baking oven and dries.According to
In prepared composite material the volume fraction of SiC particulate weigh the pore creating material of certain mass, high-temperature agglomerant, low temperature bonding agent and
Magnesium alloy.
Step 2: mixing: by certain mass ratio through the processed SiC particulate of step 1, pore creating material, high-temperature agglomerant, low temperature
Binder is put into dry-powder mixer and mixes.Mixed material is then taken out, suitable distilled water is added, is continued with electric blender
Stirring, is made uniform precast body slurry.
Step 3: base: mixed precast body slurry is put into precast body crude green body mold, applies 60~80MPa's to upper mold
Pressure and pressure maintaining 30S, the precast body blank for being Avol% by the SiCp content that precast body slurry is pressed into thin sheet form.
Step 4: step 2 and step 3 is repeated several times, preparing SiCp content is respectively the pre- of Bvol%, Cvol% and Dvol%
Body blank processed.
Step 5: by the precast body blank of Avol%, Bvol%, Cvol% and Dvol%, by volume fraction, group is loaded from low to high
Come, be put into multilayer precast body shaping dies, apply the pressure of 180~200MPa to upper mold, blank is compacted by Bidirectional-pressure.
Step 6: the multilayer prepared accumulation precast body blank is put into 80 DEG C of baking oven dry 2h, is put into resistance furnace later
In by specific heating curve heat, be dehydrated, dumping, and sinter the different porous preform of reinforcement volume fraction into.
Step 7: the multilayer sintered is accumulated into precast body blank and magnesium alloy is put into vacuum pressure infiltration device.It vacuumizes
To 10pa hereinafter, plus be evacuated to 10pa again hereinafter, being repeated 4 times after argon gas, be finally evacuated to 10pa or less.Then by multilayer
Accumulation precast body blank and magnesium alloy are heated to 680 DEG C and keep the temperature 10 minutes, lead to argon gas later to 1~3Mpa and pressure maintaining 10 divides
Multilayer accumulation SiC particulate enhancing magnesium-based composite material is made in clock.
Step 8: after pressure maintaining, to infiltrated multilayer accumulation SiC particulate enhancing magnesium-based composite material be oriented solidification with
Eliminate casting flaw.
2. the preparation process of multilayer accumulation SiC particulate enhancing magnesium-based composite material according to claim 1, feature exist
In: there is variation in the porosity of the multilayer accumulation precast body blank, multilayer accumulates precast body by four on space thickness direction
The precast body composition of the different reinforcement volume fractions of kind.
3. the preparation process of multilayer accumulation SiC particulate enhancing magnesium-based composite material according to claim 1, feature exist
In: after vacuum pressure infiltration, prepared composite material macroshape is two-dimentional plate or shell.It is not androgynous to divide between rate material
Without apparent interface, the composite material of near-net-shape can be obtained.
4. the preparation process of multilayer accumulation SiC particulate enhancing magnesium-based composite material according to claim 1, feature exist
In: the numerical value of the A is 30, and reinforced phase body divides rate to be 30；The numerical value of the B is 40, and reinforced phase body divides rate to be 40；The C's
Numerical value is 50, and reinforced phase body divides rate to be 50；The numerical value of the D is 60, and reinforced phase body divides rate to be 60.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114932223A (en) * | 2022-06-07 | 2022-08-23 | 江苏精研科技股份有限公司 | Co-sintering preparation method of metal-based composite material |
| CN115491568A (en) * | 2022-09-27 | 2022-12-20 | 太原理工大学 | Preparation method of SiC particle reinforced magnesium matrix composite |
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| CN114932223A (en) * | 2022-06-07 | 2022-08-23 | 江苏精研科技股份有限公司 | Co-sintering preparation method of metal-based composite material |
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| CN115491568A (en) * | 2022-09-27 | 2022-12-20 | 太原理工大学 | Preparation method of SiC particle reinforced magnesium matrix composite |
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Application publication date: 20190129 |