CN108893639A - A kind of short route vacuum hot extrusion prepares big ingot shape SiCP/Al composite material blank method - Google Patents
A kind of short route vacuum hot extrusion prepares big ingot shape SiCP/Al composite material blank method Download PDFInfo
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- CN108893639A CN108893639A CN201810844113.8A CN201810844113A CN108893639A CN 108893639 A CN108893639 A CN 108893639A CN 201810844113 A CN201810844113 A CN 201810844113A CN 108893639 A CN108893639 A CN 108893639A
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- composite material
- hot extrusion
- silicon carbide
- material blank
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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
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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
- C22C1/0408—Light metal alloys
- C22C1/0416—Aluminium-based alloys
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22C—ALLOYS
- C22C21/00—Alloys based on aluminium
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- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
- C22F1/04—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working of aluminium or alloys based thereon
Abstract
The invention belongs to technical field of composite material molding, discloses a kind of short route hot extrusion and prepare big ingot shape SiCP/ Al composite material blank method, accompanying method prepare SiC in powder metallurgic methodPOn the basis of/Al composite material, on the one hand the wetability for increasing itself and Al alloy powder is modified to silicon-carbide particle by using surface modifier, on the other hand the base link of prefabricated blank is prepared by saving powder metallurgy, directly expects vacuum environment hot extrusion SiC from silicon carbide and Al alloy powder mixingPThe process route of/Al composite material blank finished composite material.So as to shorten the preparation link for being cold-pressed prefabricated blank in prior powder metallurgy technique, good vacuum hot extrusion SiC is providedP/ Al composite material blank improves production efficiency, save the cost.
Description
Technical field
The invention belongs to technical field of composite material molding more particularly to a kind of short route vacuum hot extrusion to prepare big ingot shape
SiCP/ Al composite material blank method.
Background technique
Aluminum-base silicon carbide composite material is a kind of multiple as the aluminium alloy of reinforcement using different-grain diameter, high-volume fractional silicon-carbide
Condensation material. SiCP/ Al composite material thermal conductivity with higher, low thermal coefficient of expansion and thermophysical property outstanding and comprehensive
Mechanical property is closed, aerospace, Electronic Packaging industry, the neck such as IGBT power module, new-energy automobile, electric locomotive are commonly applied to
Domain.
Currently, country SiCPThe production of/Al composite material is using techniques such as powder metallurgy, pressure-free impregnation, Pressure Infiltrations.Its
In, powder metallurgic method include the pretreatment of powder, powder be mixed, static pressure at prefabricated blank, it is hot-forming and etc., it can be achieved that
SiCPIt is uniformly distributed in Al alloy substrate, and design is cut out according to the performance requirement progress ingredient for meeting material or device；
Machining cost and material loss is greatly reduced in net forming technology；Sintering temperature is low, and SiC can be effectively suppressedP/ Al alloy interface
The generation of reaction.Pressure-free impregnation or pressure infiltration method include the preparation of ceramic honey comb prefabricated blank, close without Al under pressure or pressure condition
The infiltration of golden melt.
It is influenced since the above technological process of production is longer and silicon-carbide particle wetability is poor etc., high-end electronic encapsulation row
Industry SiCP/ Al composite material still depends on import.
Summary of the invention
The present invention in view of the above technical problems, provides a kind of short route vacuum hot extrusion and prepares big ingot shape SiCP/ Al is multiple
Condensation material blank method, the method is using directly from silicon carbide and aluminium alloy mixed-powder vacuum hot extrusion molding SiCP/Al
The process route of composite material blank reduces the porosity of prior powder metallurgy so as to shorten production procedure, increases hot extrusion green compact
The consistency of material provides good hot extrusion blank, improves production efficiency, save the cost.
The technical solution adopted in the present invention is as follows：
A kind of short route vacuum hot extrusion prepares big ingot shape SiCP/ Al composite material blank method, includes the following steps：
The first step：The silicon-carbide particle for screening out different-grain diameter mixes according to a certain percentage, obtains silicon carbide hybrid particles；
Second step：Silicon carbide hybrid particles surface is subjected to pickling, the pollutant of silicon carbide is eliminated, so that silicon carbide
Surface cleaning；
Third step：Silicon carbide hybrid particles are cleaned with deionized water, removal remains in the acid on silicon-carbide particle surface, clearly
It is dried for standby after washing；
4th step：To silicon carbide hybrid particles shaping, break corner is removed, improves roundness, and acid is used to silicon carbide
Property surface modifier carry out surface modification treatment, and then increase silicon-carbide particle and aluminium wetability；
5th step：Pretreated silicon carbide hybrid particles and Al alloy powder are subjected to mixing according to a certain percentage；
6th step：Mixed-powder is fitted into ball grinder, and to high pure nitrogen is filled in ball grinder, prevents Al alloy powder
It is aoxidized in mechanical milling process；
7th step：Ball milling is carried out to the ball material being fitted into ball grinder, so that silicon carbide hybrid particles and Al alloy powder are mixed
It closes uniform；
8th step：Uniformly mixed powder is added in high temperature alloy hot-extrusion mold, then hot extrusion system is carried out
It vacuumizes；
9th step：By after the practical stocking volume precompressed 10% of the powder being uniformly mixed in mold in vacuum environment, it is passed through
Slowly apply pressure in current course, extrusion temperature is controlled by temp measuring system at 580 ± 20 DEG C.
Tenth step：By SiCPThe demoulding of/Al composite material blank, and carry out homogenizing annealing processing.
It further include being sieved to the partial size of silicon-carbide particle in the above-mentioned first step, partial size is respectively 80 μm, 15 μm and 2 μ
The silicon-carbide particle of m is 7 according to mass ratio:2.5:0.5 is matched.
In above-mentioned second step, silicon carbide hybrid particles select the dilute hydrochloric acid that mass fraction is 8.5% to carry out pickling.
In above-mentioned 4th step, increase the roundness of silicon carbide hybrid particles by ball milling, and then increases silicon carbide and aluminium conjunction
Wetability of the gold under semisolid.
In above-mentioned 5th step, silicon carbide hybrid particles and Al alloy powder are according to volume ratio 13:7 are matched.
In above-mentioned 6th step, the silicon carbide and aluminium alloy mixed-powder are mainly complete in nitrogen protection planetary ball mill tank
At pellet proportion is 1：2, the ball mill mixing time is 30min, revolving speed 250r/min.
In above-mentioned 8th step, the silicon carbide and the direct vacuum hot extrusion molding SiC of aluminium alloy mixed-powderP/ Al is compound
Vacuum degree during material blank is 10-2Pa,
In above-mentioned tenth step, the homogenizing annealing temperature is 450 DEG C, soaking time 4h.
Short route vacuum hot extrusion of the present invention prepares big ingot shape SiCPIn/Al composite material blank method, pass through
The wettability of series of preprocessing method improvement silicon carbide, including pickling, washing, shaping and use are surfactant-modified.
After pretreatment, the wetability between silicon carbide and Al alloy powder is greatly improved, so that in subsequent preparation process
Obtained SiCP/ Al blank is more uniform and fine and close, improves thermal conductivity and mechanical property, reduces thermal expansion coefficient.Then, directly
It connects and carries out vacuum hot extrusion technique using silicon carbide and aluminium alloy mixed-powder, without the process of preparation prefabricated blank, save
Process flow improves production efficiency, has saved time cost.
Beneficial effects of the present invention are as follows：
Silicon carbide and the big ingot shape SiC of the direct vacuum hot extrusion molding of aluminium alloy mixed-powderPThe work of/Al composite material blank
Skill route saves the base link of powder metallurgy isostatic cool pressing preparation prefabricated blank and without in the technical process such as pressure, Pressure Infiltration
Ceramic honey comb prefabricated blank base link.To shorten technique production procedure as far as possible, the porosity of prior powder metallurgy is reduced,
The consistency for increasing hot extrusion blank provides good hot extrusion blank, improves production efficiency, save the cost.
Detailed description of the invention
Fig. 1 is vacuum hot extrusion process schematic diagram in the embodiment of the present invention；
Fig. 2 is the production procedure schematic diagram in the method for the invention.
Wherein：1, squeezing rod；2, dummy block；3, vacuum chamber；4, thermocouple；5, high temperature alloy mold；6, hydrostatic head； 7,
Dynamic head；8, graphite liner；9, mixed-powder；10, copper sheet；11, power supply.
Specific embodiment
Combined with specific embodiments below and attached drawing, to illustrate technical solution of the present invention, but it should be stated that, Xia Shushi
It applies example and is the specific example of technical solution of the present invention, and be not construed as limitation of the present invention.
Embodiment 1：
As shown in Figure 1, a kind of short route vacuum hot extrusion described in the present embodiment prepares big ingot shape SiCP/ Al composite wood material base
Material method, includes the following steps：
The first step：Selection screening is carried out to raw material silicon-carbide particle partial size using vibrating screen, and is respectively 80 μ by partial size
M, 15 μm and 2 μm of silicon-carbide particle is 7 according to mass ratio:2.5:0.5 is matched；
Second step：The silicon-carbide particle surface that the first step is mixed according to the proportion carries out pickling, and pickling solution selects quality
The dilute hydrochloric acid that score is 8.5%, eliminates the pollutant of silicon carbide, so that silicon carbide cleans；
Third step：Silicon-carbide particle after second step pickling is cleaned using deionized water, removal remains in silicon carbide
The dilute hydrochloric acid on grain surface, is dried for standby at low temperature after cleaning；
4th step：By third step treated silicon-carbide particle shaping, break corner is removed, roundness is increased by ball milling；And
It takes acidic surface modifiers to carry out surface modification treatment silicon carbide, and then increases the wetting of silicon-carbide particle and aluminium
Property；
5th step：By pretreated silicon-carbide particle and Al alloy powder according to volume ratio 13:7 carry out mixing, are formed
Uniformly mixed powder 9；
6th step：By mixed-powder 9 in the 5th step according to ratio of grinding media to material 1：2 are fitted into planetary ball mill tank, and in ball grinder
It is filled with high pure nitrogen, prevents Al alloy powder from aoxidizing in mechanical milling process；
7th step：Selection planetary ball mill is to ball, the material progress ball milling being fitted into ball grinder in the 6th step, when ball mill mixing
Between be 30min, revolving speed 250r/min so that silicon-carbide particle is uniformly mixed with Al alloy powder；
8th step：5 hot-extrusion mold of high temperature alloy for having graphite liner 8 is added in the powder 9 that 7th step is uniformly mixed
In, then vacuum chamber 3 is vacuumized, vacuum degree 10-2Pa；
9th step：By after 9 precompressed 10% of powder being uniformly mixed in mold in vacuum environment, start heating power supply 11,
Electric current is by copper sheet 10, and the dynamic head 7 contacted with mixed-powder 9 and hydrostatic head 6 generate heat, and extrusion temperature passes through thermocouple
At 580 ± 20 DEG C, hot extrusion pressure is 40MPa for 4 controls.
Tenth step：9th step vacuum hot extrusion is prepared into big ingot shape SiCPThe demoulding of/Al composite material blank 9 is homogenized
Annealing, annealing temperature are 450 DEG C, soaking time 4h.
It is prepared twice in the present embodiment, respectively number 1 and 2.
To the SiC prepared in the present embodimentP/ Al composite material blank carries out thermal conductivity, thermal expansion coefficient and mechanical performance
Test, the results are shown in Table 1.As can be known from Table 1, the SiC prepared in the present embodimentP/ Al composite material blank has highly thermally conductive
Rate and low-expansion coefficient, so that it also just has good stability at high temperature or in the biggish situation of the temperature difference；The SiC simultaneouslyP/
Al composite material blank also has good bending strength, can be used for Electronic Packaging field.
SiC obtained in 1 embodiment of the present invention of tablePThe capabilities list of/Al composite material blank
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention.It is all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (8)
1. a kind of short route vacuum hot extrusion prepares big ingot shape SiCP/ Al composite material blank method, which is characterized in that including with
Lower step：
The first step：The silicon-carbide particle for screening out different-grain diameter mixes according to a certain percentage, obtains silicon carbide hybrid particles；
Second step：Silicon carbide hybrid particles surface is subjected to pickling；
Third step：Silicon carbide hybrid particles are cleaned with deionized water, are dried for standby after cleaning；
4th step：To silicon carbide hybrid particles shaping, break corner is removed, improves roundness；And acid table is used to silicon carbide
Face modifying agent carries out surface modification treatment；
5th step：Pretreated silicon carbide hybrid particles and Al alloy powder are subjected to mixing according to a certain percentage；
6th step：Mixed-powder is fitted into ball grinder, and to being filled with high pure nitrogen in ball grinder；
7th step：Ball milling is carried out to the ball material being fitted into ball grinder；
8th step：Uniformly mixed powder is added in high temperature alloy hot-extrusion mold, then hot extrusion system take out true
It is empty；
9th step：In vacuum environment by the powder being uniformly mixed in mold according to practical stocking volume precompressed 10% after, be passed through
Slowly apply pressure in current course, extrusion temperature is controlled by temp measuring system at 580 ± 20 DEG C.
Tenth step：By SiCPThe demoulding of/Al composite material blank, and carry out homogenizing annealing processing.
2. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In the first step, partial size be respectively 80 μm, 15 μm and 2 μm silicon-carbide particle according to mass ratio be 7:
2.5:0.5 is matched.
3. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In the second step, silicon carbide hybrid particles select the dilute hydrochloric acid that mass fraction is 8.5% to carry out pickling.
4. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In 4th step, increase the roundness of silicon carbide hybrid particles by ball milling.
5. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In 5th step, silicon carbide hybrid particles and Al alloy powder are according to volume ratio 13：7 are matched.
6. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In 6th step, the silicon carbide and aluminium alloy mixed-powder are mainly in nitrogen protection planetary ball mill tank
It completes, pellet proportion is 1：2, the ball mill mixing time is 30min, revolving speed 250r/min.
7. a kind of short route vacuum hot extrusion prepares big ingot shape SiC according to claim 1P/ Al composite material blank method,
It is characterized in that：In 8th step, the silicon carbide and the direct vacuum hot extrusion molding SiC of aluminium alloy mixed-powderP/ Al is multiple
Vacuum degree during condensation material blank is 10-2Pa。
8. a kind of short route vacuum hot extrusion prepares big ingot shape SiC as described in claim 1PIts spy of/Al composite material blank method
Sign is：In tenth step, the homogenizing annealing temperature is 450 DEG C, soaking time 4h.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482881A (en) * | 2019-01-07 | 2019-03-19 | 常州泰格尔电子材料科技有限公司 | A kind of selective laser sintering preparation SiC/Al composite material structural member method |
| CN110257741A (en) * | 2019-07-01 | 2019-09-20 | 东北轻合金有限责任公司 | A kind of SiC particulate enhances the pressing method of 6092 aluminum matrix composite profiles |
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| CN107904452A (en) * | 2017-11-09 | 2018-04-13 | 陕西盛迈石油有限公司 | A kind of preparation method of double scale SiC particulate reinforced aluminum matrix composites |
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2018
- 2018-07-27 CN CN201810844113.8A patent/CN108893639A/en active Pending
Patent Citations (6)
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| CN1422970A (en) * | 2001-12-06 | 2003-06-11 | 北京有色金属研究总院 | Particle reinforced aluminium-based composite material and manufacture method thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109482881A (en) * | 2019-01-07 | 2019-03-19 | 常州泰格尔电子材料科技有限公司 | A kind of selective laser sintering preparation SiC/Al composite material structural member method |
| CN110257741A (en) * | 2019-07-01 | 2019-09-20 | 东北轻合金有限责任公司 | A kind of SiC particulate enhances the pressing method of 6092 aluminum matrix composite profiles |
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