CN107641727A - A kind of method that high-volume fractional SiC particulate reinforced Al matrix composite is prepared by high velocity compacted - Google Patents
A kind of method that high-volume fractional SiC particulate reinforced Al matrix composite is prepared by high velocity compacted Download PDFInfo
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Abstract
The invention discloses a kind of method that high-volume fractional SiC particulate reinforced Al matrix composite is prepared by high velocity compacted, including the shaping of the oxidation processes batch mixing of SiC powder, high velocity compacted, N2Gas-protecting sintering and cooling step.The present invention prepares the pressed compact of the SiC particulate reinforced Al matrix composite of high-volume fractional by high velocity compacting technique, and green density prepared by the process is high and Density Distribution is uniform, productivity ratio is high, cost is cheap, can economic molding large part.SiC particulate REINFORCED Al pressed compact is after the compacting of high velocity compacting technique single, and relative density is 85 92%, and higher green density advantageously reduces sintering temperature and sintering time.In N2Under atmosphere protection, pressed compact is heated to more than aluminium alloy fusing point carry out liquid-phase sintering, and the space between liquid phase filling silicon-carbide particle and the metallurgical binding between Al alloy powder are carried out simultaneously.Sintered blank solidification cooling after obtain carborundum be evenly distributed, relative density 94 98%, the 190W/mK of thermal conductivity 150 Aluminum Matrix Composites Strengthened by SiC.
Description
Technical field
The present invention relates to metal-base composites Material Field, is specifically that one kind prepares high-volume fractional by high velocity compacted
The method of SiC particulate reinforced Al matrix composite.
Background technology
It is excellent that silicon-carbide particle as reinforcing material has high-melting-point, high thermal stability, low thermal coefficient of expansion, cost cheap etc.
Point, its thermal coefficient of expansion are 4.7 × 10-6K-1, thermal conductivity 80-240W/mK；Al has highly thermally conductive as matrix material simultaneously
Rate (170-220W/mK, low-density (2.7g/cm2)), it is cheap and easy to process the advantages that, with reference to the two advantage prepare
The high-volume fractional SiC reinforced Al matrix composites gone out the excellent properties such as have low density, high heat conduction, thermal coefficient of expansion controllable,
One of focus as the research of modern metal-base composites, has in Aero-Space, large scale integrated circuit, Military Electronics equipment
Very wide application prospect.
At present, the preparation method of the SiC particulate reinforced Al matrix composite of high-volume fractional has powder metallurgic method, Vacuum Heat
Press sintering process, pressureless penetration method etc..In upper several method, discharge plasma sintering method, which prepares composite, has component ratio accurate
Really, the advantages that reinforcement is evenly distributed in A1 bases, the low soaking time of sintering temperature is short, but the equipment is mainly used in laboratory
Research, is rarely used for industrialized production.Prepared by vacuum hot-pressing have Special Equipment to provide high pressure and vacuum in composite material,
The equipment cost is high, low production efficiency.Pressure-free impregnation is prepared in SiC/Al composite materials, and infiltrating temperature is far above aluminum substrate
Fusing point, easily generate Al4C3, and the ratio of matrix and reinforcement is difficult to control during infiltration, is preparing the mistake of precast body
The hole of holding one's breath of some in journey can not be filled by matrix.
The content of the invention：
The technical problems to be solved by the invention are：In view of it is compound to prepare high-volume fractional SiC particulate enhancing A1 bases at present
Technology present in material lacks limit and deficiency, there is provided one kind prepares relative inexpensiveness, and technological process simplifies, and finally obtains low hole
Gap rate, thermal conductivity are high, the method for the SiC reinforced Al matrix composites of high-volume fractional, and suitable for large-scale industrialized production.
The present invention solves its technical problem and uses following technical scheme：
A kind of preparation method of high-volume fractional SiC reinforced Al matrix composites, comprises the following steps：
(1) silicon carbide powder is surface-treated：
By silicon carbide powder ultrasonic vibration 30-60 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed,
Then processing is dried, 10-12 hours are first dried in 150-200 DEG C of baking oven, dried carborundum is put into corundum earthenware
In crucible, place into high temperature furnace, be incubated 2-4 hours at a temperature of 1000-1200 DEG C, 2-5 DEG C of programming rate/min, make its table
Face forms one layer of fine and close SiO2Layer, then furnace cooling.
(2) batch mixing：
Al alloy powder is added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for the body of mixed-powder
Fraction is 30-50%, and the volume fraction that Al alloy powder accounts for mixed-powder is 50-70%, and mixed material is placed in into drum-type
12-15 hours, rotating speed 180r/min, the mixed-powder being had good uniformity are mixed in batch mixer；
(3) high velocity compacted is molded：
Using gravitional force as way of energy storage, by mixed-powder high velocity compacted experimental machine compacting life made from step (2)
Base, weight weight for 50-100Kg, by the eminence for rising to 0.2-1.0m of weight, by adjusting weight quality and compacting height
Change compacting energy, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；
(4)N2Gas-protecting sintering：
SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 680-720 DEG C to set sintering temperature, N2
Sintering is protected under atmosphere, 3-4 DEG C of heating rate/min, 2-3 hours is incubated after reaching predetermined sintering temperature, obtains SiC REINFORCED Als
Based composites preform；
(5) cool down：
SiC reinforced Al matrix composite preform cooling downs are controlled to 400-450 DEG C by tube-type atmosphere furnace, cooling speed
2-3 DEG C of rate/min, 1-3 hours are incubated, furnace cooling, treat that it is cooled to room temperature, take out sample, removal is attached to sample surfaces
Aluminium alloy and oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
In above-mentioned steps (1), SiC particulate particle diameter is 5-40um.
In above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, and the particle diameter of 6061 Al alloy powders is 1-
20um。
In above-mentioned steps (3), high velocity compacted is once compressing, uses zinc stearate lubricated dies inwall, pressed compact pressure
Without layering or unfilled corner after system, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 85-92%.
In above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, thick 6061 Al alloy powders of its upper and lower surface covering 2-3mm.
Before sintering, tube-type atmosphere furnace is first passed through the N of 0.5-1 hours2To exclude residual air, pressed compact is prevented to be oxidized.
In above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
The technical parameter of SiC reinforced Al matrix composites prepared by the inventive method is：Fine and close rate is 94.0%-
98.0%, thermal conductivity 150-190W/mK.
The inventive method prepare SiC reinforced Al matrix composites, can be applied to Aero-Space, large scale integrated circuit,
Military Electronics clothing arts.
The present invention Basic Mechanism be：During high velocity compacted, mixed-powder is mainly carried out with filling and mode of texturing
Densification.Carborundum the gap being filled between particle, further increases pressed compact in high velocity impact there occurs fragmentation simultaneously
Consistency, the oxide layer on Al alloy powder surface is destroyed in high velocity impact, friction process, forms the interface of cold welding and fresh
Surface, be advantageous to the densification in sintering process.Therefore it can be obtained by the higher pressed compact of relative density in pressing stage.
Sintering temperature is 680-720 DEG C, N2Under atmosphere protection, the SiO on SiC particulate surface2Oxide layer and melting Al interface there occurs
Be advantageous to the reaction of SiC particulate reinforced Al matrix composite interface cohesion：2Al+SiO2+Mg=MgAl2O4+ Si, so as to improve
The mechanical property of SiC particulate reinforced Al matrix composite, and the Si in reaction product is filled into the gap in sintered blank, reduces it
Porosity, makes the consistency of material increase.Finally prepare high intensity, high-compactness, the SiC particulate REINFORCED Al of high-volume fractional
Based composites.
The present invention compared with prior art, has following beneficial effect：
1st, SiC particulate reinforced Al matrix composite is suppressed using the method for high velocity compacted, effectively raises the phase of pressed compact
To density.Because the high density of pressed compact can shorten sintering time, so being further advantageous to the control of grain size, and then lifted
The performance of product, and reduce cost.Whole high velocity compacted process can realize full-automation, drastically increase production effect
Rate.
2nd, preparation technology is simple, the relative density of SiC particulate in prepared SiC particulate reinforced Al matrix composite
Height, reinforcement is evenly distributed in A1 bases, volume fraction is larger, sintering temperature is low, cost of manufacture is cheap.
3rd, it is that fine and close rate is 94.0%-98.0% finally to prepare fine and close rate, thermal conductivity 150-190W/mK, volume integral
Number is 50% SiC particulate reinforced Al matrix composite.
At present, the SiC REINFORCED Al bases of high-volume fractional during in substantial amounts of research baseset prepared by pressureless penetration method both at home and abroad
In the research and development of composite, the material property prepared is excellent, can meet lightweight, the high power of advanced electronic component
Density, high reliability and long-life design requirement, but equipment cost is high, complex process limit high-volume fractional SiC increase
The application of strong Al based composites.Using powder metallurgic method (high velocity compacted+pressureless sintering) can low-cost high-efficiency prepare high body
Fraction SiC reinforced Al matrix composites, performance can meet design requirement.Make high-volume fractional SiC REINFORCED Al base composite woods
Material has broader practice prospect in Aero-Space, large scale integrated circuit, Military Electronics equipment.
Compared with the other method in background technology, high velocity compacted of the invention-pressureless sintering method preparation technology is simple, high
Fast compact technique greatly shortens composite powder pressed compact preparation time, and the green density prepared is high and is evenly distributed, and is advantageous to
Compound densification in sintering process strengthen made SiC A1 based composites porositys are relatively low, good heat conductivity, the work
Skill production efficiency is high, cost is low, promotes the large-scale application of SiC enhancing A1 based composites.
Brief description of the drawings
Fig. 1 is the SiC particulate reinforced Al matrix composite sample fractograph that in material of the present invention prepared by embodiment 4；
Fig. 2 is that embodiment 4 prepares SiC particulate reinforced Al matrix composite sample SEM spectrum in material of the present invention.
Embodiment
With reference to embodiment and accompanying drawing, the invention will be further described, but does not limit the present invention.
Embodiment 1：
A kind of preparation method of high-volume fractional SiC reinforced Al matrix composites, comprises the following steps：
(1) silicon carbide powder is surface-treated：
By silicon carbide powder ultrasonic vibration 45 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed, so
After carry out drying process, first dry 12 hours, dried carborundum be put into corundum crucible, then put in 200 DEG C of baking ovens
Enter in high temperature furnace, 2 hours, 5 DEG C/min of programming rate be incubated at a temperature of 1200 DEG C, make its surface formed one layer it is fine and close
SiO2Layer, then furnace cooling.
(2) batch mixing：
6061 Al alloy powders are added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for mixed-powder
Volume fraction be 40%, 6061 Al alloy powders account for mixed-powder volume fraction be 60%, mixed material is placed in roller
Mixed 12 hours, rotating speed 180r/min in formula batch mixer, the mixed-powder being had good uniformity；
(3) high velocity compacted is molded：
Using gravitional force as way of energy storage, by mixed-powder high velocity compacted experimental machine compacting life made from step (2)
Base, weight weight for 50Kg, the eminence for rising to 0.2m of weight is suppressed by adjusting weight quality and compacting Level Change
Energy, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；
(4)N2Gas-protecting sintering：
SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 700 DEG C to set sintering temperature, N2Atmosphere
Lower protection sintering, 3 DEG C/min of heating rate, is incubated 2 hours after reaching predetermined sintering temperature, obtains SiC REINFORCED Al base composite woods
Expect preform；
(5) cool down：
SiC reinforced Al matrix composite preform cooling downs are controlled to 400 DEG C by tube-type atmosphere furnace, cooldown rate 2
DEG C/min, 2 hours are incubated, furnace cooling, treats that it is cooled to room temperature, takes out sample, remove the aluminium alloy for being attached to sample surfaces
And oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
In above-mentioned steps (1), SiC particulate particle diameter is 5-40um.
In above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, and the particle diameter of 6061 Al alloy powders is 1-
20um。
In above-mentioned steps (3), high velocity compacted is once compressing, uses zinc stearate lubricated dies inwall, pressed compact pressure
Without layering or unfilled corner after system, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 88.4%.
In above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, thick 6061 Al alloy powders of its upper and lower surface covering 2-3mm.
Before sintering, tube-type atmosphere furnace is first passed through the N of 1 hour2To exclude residual air, pressed compact is prevented to be oxidized.
In above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
Experiment test：
The fine and close rate of resulting SiC particulate reinforced Al matrix composite finished product is 96.32%, thermal conductivity 157.9W/
mK。
Embodiment 2：
A kind of preparation method of high-volume fractional SiC reinforced Al matrix composites, comprises the following steps：
(1) silicon carbide powder is surface-treated：
By silicon carbide powder ultrasonic vibration 45 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed, so
After carry out drying process, first dry 12 hours, dried carborundum be put into corundum crucible, then put in 200 DEG C of baking ovens
Enter in high temperature furnace, 2 hours, 5 DEG C/min of programming rate be incubated at a temperature of 1200 DEG C, make its surface formed one layer it is fine and close
SiO2Layer, then furnace cooling.
(2) batch mixing：
6061 Al alloy powders are added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for mixed-powder
Volume fraction be 50%, 6061 Al alloy powders account for mixed-powder volume fraction be 50%, mixed material is placed in roller
Mixed 12 hours, rotating speed 180r/min in formula batch mixer, the mixed-powder being had good uniformity；
(3) high velocity compacted is molded：
Using gravitional force as way of energy storage, by mixed-powder high velocity compacted experimental machine compacting life made from step (2)
Base, weight weight for 50Kg, the eminence for rising to 0.3m of weight is suppressed by adjusting weight quality and compacting Level Change
Energy, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；
(4)N2Gas-protecting sintering：
SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 680 DEG C to set sintering temperature, N2Atmosphere
Lower protection sintering, 3 DEG C/min of heating rate, is incubated 2 hours after reaching predetermined sintering temperature, obtains SiC REINFORCED Al base composite woods
Expect preform；
(5) cool down：
SiC reinforced Al matrix composite preform cooling downs are controlled to 400 DEG C by tube-type atmosphere furnace, cooldown rate 2
DEG C/min, 2 hours are incubated, furnace cooling, treats that it is cooled to room temperature, takes out sample, remove the aluminium alloy for being attached to sample surfaces
And oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
In above-mentioned steps (1), SiC particulate particle diameter is 5-40um.
In above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, and the particle diameter of 6061 Al alloy powders is 1-
20um。
In above-mentioned steps (3), high velocity compacted is once compressing, uses zinc stearate lubricated dies inwall, pressed compact pressure
Without layering or unfilled corner after system, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 88.4%.
In above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, thick 6061 Al alloy powders of its upper and lower surface covering 2-3mm.
Before sintering, tube-type atmosphere furnace is first passed through the N of 1 hour2To exclude residual air, pressed compact is prevented to be oxidized.
In above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
Experiment test：
The fine and close rate of resulting SiC particulate reinforced Al matrix composite finished product is 94.59%, thermal conductivity 165.7W/
mK。
Embodiment 3：
A kind of preparation method of high-volume fractional SiC reinforced Al matrix composites, comprises the following steps：
(1) silicon carbide powder is surface-treated：
By silicon carbide powder ultrasonic vibration 45 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed, so
After carry out drying process, first dry 12 hours, dried carborundum be put into corundum crucible, then put in 200 DEG C of baking ovens
Enter in high temperature furnace, 2 hours, 5 DEG C/min of programming rate be incubated at a temperature of 1200 DEG C, make its surface formed one layer it is fine and close
SiO2Layer, then furnace cooling.
(2) batch mixing：
6061 Al alloy powders are added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for mixed-powder
Volume fraction be 50%, 6061 Al alloy powders account for mixed-powder volume fraction be 50%, mixed material is placed in roller
Mixed 12 hours, rotating speed 180r/min in formula batch mixer, the mixed-powder being had good uniformity；
(3) high velocity compacted is molded：
Using gravitional force as way of energy storage, by mixed-powder high velocity compacted experimental machine compacting life made from step (2)
Base, weight weight for 50Kg, the eminence for rising to 0.3m of weight is suppressed by adjusting weight quality and compacting Level Change
Energy, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；
(4)N2Gas-protecting sintering：
SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 700 DEG C to set sintering temperature, N2Atmosphere
Lower protection sintering, 3 DEG C/min of heating rate, is incubated 2 hours after reaching predetermined sintering temperature, obtains SiC REINFORCED Al base composite woods
Expect preform；
(5) cool down：
SiC reinforced Al matrix composite preform cooling downs are controlled to 400 DEG C by tube-type atmosphere furnace, cooldown rate 2
DEG C/min, 2 hours are incubated, furnace cooling, treats that it is cooled to room temperature, takes out sample, remove the aluminium alloy for being attached to sample surfaces
And oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
In above-mentioned steps (1), SiC particulate particle diameter is 5-40um.
In above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, and the particle diameter of 6061 Al alloy powders is 1-
20um。
In above-mentioned steps (3), high velocity compacted is once compressing, uses zinc stearate lubricated dies inwall, pressed compact pressure
Without layering or unfilled corner after system, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 89.6%.
In above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, thick 6061 Al alloy powders of its upper and lower surface covering 2-3mm.
Before sintering, tube-type atmosphere furnace is first passed through the N of 1 hour2To exclude residual air, pressed compact is prevented to be oxidized.
In above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
The fine and close rate of SiC particulate reinforced Al matrix composite finished product obtained by the present embodiment is 96.11%, and thermal conductivity is
170.5W/mK。
Embodiment 4：
A kind of preparation method of high-volume fractional SiC reinforced Al matrix composites, comprises the following steps：
(1) silicon carbide powder is surface-treated：
By silicon carbide powder ultrasonic vibration 45 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed, so
After carry out drying process, first dry 12 hours, dried carborundum be put into corundum crucible, then put in 200 DEG C of baking ovens
Enter in high temperature furnace, 2 hours, 5 DEG C/min of programming rate be incubated at a temperature of 1200 DEG C, make its surface formed one layer it is fine and close
SiO2Layer, then furnace cooling.
(2) batch mixing：
6061 Al alloy powders are added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for mixed-powder
Volume fraction be 50%, 6061 Al alloy powders account for mixed-powder volume fraction be 50%, mixed material is placed in roller
Mixed 12 hours, rotating speed 180r/min in formula batch mixer, the mixed-powder being had good uniformity；
(3) high velocity compacted is molded：
Using gravitional force as way of energy storage, by mixed-powder high velocity compacted experimental machine compacting life made from step (2)
Base, weight weight for 50Kg, the eminence for rising to 0.8m of weight is suppressed by adjusting weight quality and compacting Level Change
Energy, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；
(4)N2Gas-protecting sintering：
SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 700 DEG C to set sintering temperature, N2Atmosphere
Lower protection sintering, 3 DEG C/min of heating rate, is incubated 2 hours after reaching predetermined sintering temperature, obtains SiC REINFORCED Al base composite woods
Expect preform；
(5) cool down：
SiC reinforced Al matrix composite preform cooling downs are controlled to 400 DEG C by tube-type atmosphere furnace, cooldown rate 2
DEG C/min, 2 hours are incubated, furnace cooling, treats that it is cooled to room temperature, takes out sample, remove the aluminium alloy for being attached to sample surfaces
And oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
In above-mentioned steps (1), SiC particulate particle diameter is 5-40um.
In above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, and the particle diameter of 6061 Al alloy powders is 1-
20um。
In above-mentioned steps (3), high velocity compacted is once compressing, uses zinc stearate lubricated dies inwall, pressed compact pressure
Without layering or unfilled corner after system, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 91.5%.
In above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, thick 6061 Al alloy powders of its upper and lower surface covering 2-3mm.
Before sintering, tube-type atmosphere furnace is first passed through the N of 1 hour2To exclude residual air, pressed compact is prevented to be oxidized.
In above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
Experiment test：
The fine and close rate of SiC particulate reinforced Al matrix composite finished product obtained by the present embodiment is 97.61%, and thermal conductivity is
174.9W/mK。
Fig. 1 is SiC particulate reinforced Al matrix composite sample fractograph prepared by embodiment 4, it can be seen that carborundum
It is evenly distributed in matrix and space is less.
Fig. 2 is that embodiment 4 prepares 50%SiC particle reinforced Al matrix composite sample SEM spectrums, and fracture apperance shows,
The fracture mode of carborundum is cleavage fracture, and matrix is ductile rupture.
Claims (6)
- A kind of 1. method that high-volume fractional SiC particulate reinforced Al matrix composite is prepared by high velocity compacted, it is characterised in that Comprise the following steps：(1) silicon carbide powder is surface-treated：By silicon carbide powder ultrasonic vibration 30-60 minutes in deionized water, the impurity and greasy dirt of silicon carbide are removed, then Processing is dried, 10-12 hours are first dried in 150-200 DEG C of baking oven, dried carborundum is put into corundum crucible, Place into high temperature furnace, be incubated 2-4 hours at a temperature of 1000-1200 DEG C, 2-5 DEG C of programming rate/min, make its surface shape The SiO fine and close into one layer2Layer, then furnace cooling；(2) batch mixing：Al alloy powder is added into the silicon carbide powder after oxidation processes, wherein silicon carbide powder accounts for the volume integral of mixed-powder Number is 30-50%, and the volume fraction that Al alloy powder accounts for mixed-powder is 50-70%, and mixed material is placed in into drum-type batch mixing 12-15 hours, rotating speed 180r/min, the mixed-powder being had good uniformity are mixed in machine；(3) high velocity compacted is molded：Using gravitional force as way of energy storage, mixed-powder high velocity compacted experimental machine made from step (2) is suppressed into green compact, weight Hammer into shape weight for 50-100Kg, by the eminence for rising to 0.2-1.0m of weight, by adjusting weight quality and compacting Level Change Energy is suppressed, mixed powder is suppressed by the movement of falling object of weight, obtains SiC reinforced Al matrix composite pressed compacts；(4) N2 gas-protecting sinterings：SiC reinforced Al matrix composites pressed compact is placed in tube-type atmosphere furnace, it is 680-720 DEG C to set sintering temperature, N2 atmosphere Lower protection sintering, 3-4 DEG C of heating rate/min, is incubated 2-3 hours after reaching predetermined sintering temperature, obtains SiC REINFORCED Al bases and answer Condensation material preform；(5) cool down：SiC reinforced Al matrix composite preform cooling downs are controlled to 400-450 DEG C by tube-type atmosphere furnace, cooldown rate 2- 3 DEG C/min, 1-3 hours are incubated, furnace cooling, treats that it is cooled to room temperature, takes out sample, remove the aluminium conjunction for being attached to sample surfaces Gold and oxide layer, obtain SiC particulate reinforced Al matrix composite finished product.
- 2. according to claim 1 prepare high-volume fractional SiC particulate reinforced Al matrix composite by high velocity compacted Method, it is characterised in that in above-mentioned steps (1), the particle diameter of SiC particulate is 5-40um.
- 3. according to claim 1 prepare high-volume fractional SiC particulate reinforced Al matrix composite by high velocity compacted Method, it is characterised in that in above-mentioned steps (2), the Al alloy powder is 6061 Al alloy powders, 6061 Al alloy powders Particle diameter is 1-20um.
- 4. according to claim 1 prepare high-volume fractional SiC particulate reinforced Al matrix composite by high velocity compacted Method, it is characterised in that in above-mentioned steps (3), high velocity compacted is once compressing, using in zinc stearate lubricated dies Wall, without layering or unfilled corner after pressed compact compacting, after single compacting, SiC particulate REINFORCED Al pressed compact relative density is 85-92%.
- 5. according to claim 1 prepare high-volume fractional SiC particulate reinforced Al matrix composite by high velocity compacted Method, it is characterised in that in above-mentioned steps (4), pressed compact is placed on corundum and burnt in boat, its upper and lower surface covering 2-3mm thickness 6061 Al alloy powder, before sintering, tube-type atmosphere furnace is first passed through the N of 0.5-1 hours2To exclude residual air, pressed compact is prevented to be oxidized.
- 6. according to claim 1 prepare high-volume fractional SiC particulate reinforced Al matrix composite by high velocity compacted Method, it is characterised in that in above-mentioned steps (5), it is 2-3mm to remove the aluminium alloy of sample surfaces and oxidated layer thickness.
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109277578A (en) * | 2018-11-21 | 2019-01-29 | 四川建筑职业技术学院 | Prepare the powder metallurgical technique of high-volume fractional Si particle enhanced aluminum-based composite material |
| CN113755719A (en) * | 2021-08-09 | 2021-12-07 | 昆明理工大学 | High-strength, wear-resistant and antifriction aluminum-based composite material and preparation method thereof |
| CN115369291A (en) * | 2022-08-30 | 2022-11-22 | 共享智能装备有限公司 | Metal-based composite material, preparation method and use method thereof |
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| CN113755719A (en) * | 2021-08-09 | 2021-12-07 | 昆明理工大学 | High-strength, wear-resistant and antifriction aluminum-based composite material and preparation method thereof |
| CN115369291A (en) * | 2022-08-30 | 2022-11-22 | 共享智能装备有限公司 | Metal-based composite material, preparation method and use method thereof |
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