CN103276277A - Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material - Google Patents
Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material Download PDFInfo
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- CN103276277A CN103276277A CN2013101853238A CN201310185323A CN103276277A CN 103276277 A CN103276277 A CN 103276277A CN 2013101853238 A CN2013101853238 A CN 2013101853238A CN 201310185323 A CN201310185323 A CN 201310185323A CN 103276277 A CN103276277 A CN 103276277A
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- 229910010271 silicon carbide Inorganic materials 0.000 title claims abstract description 65
- 239000002131 composite material Substances 0.000 title claims abstract description 21
- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 title abstract description 11
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims abstract description 90
- 229910052782 aluminium Inorganic materials 0.000 claims abstract description 90
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 claims abstract description 62
- 239000007788 liquid Substances 0.000 claims abstract description 45
- 238000009413 insulation Methods 0.000 claims abstract description 30
- 238000000034 method Methods 0.000 claims abstract description 21
- 239000004411 aluminium Substances 0.000 claims description 54
- 238000001816 cooling Methods 0.000 claims description 48
- 229910045601 alloy Inorganic materials 0.000 claims description 27
- 239000000956 alloy Substances 0.000 claims description 27
- 238000007872 degassing Methods 0.000 claims description 13
- 229910052751 metal Inorganic materials 0.000 claims description 11
- 239000002184 metal Substances 0.000 claims description 11
- 238000004381 surface treatment Methods 0.000 claims description 9
- 238000010792 warming Methods 0.000 claims description 9
- 238000005269 aluminizing Methods 0.000 claims description 3
- 238000011049 filling Methods 0.000 claims description 3
- 239000000463 material Substances 0.000 abstract description 17
- 239000000155 melt Substances 0.000 abstract description 9
- 239000011148 porous material Substances 0.000 abstract description 5
- 230000008602 contraction Effects 0.000 abstract description 2
- 238000007711 solidification Methods 0.000 abstract description 2
- 230000008023 solidification Effects 0.000 abstract description 2
- 239000013081 microcrystal Substances 0.000 abstract 1
- 239000012466 permeate Substances 0.000 abstract 1
- 235000010210 aluminium Nutrition 0.000 description 66
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 16
- 239000007789 gas Substances 0.000 description 15
- 229910021426 porous silicon Inorganic materials 0.000 description 14
- KMWBBMXGHHLDKL-UHFFFAOYSA-N [AlH3].[Si] Chemical compound [AlH3].[Si] KMWBBMXGHHLDKL-UHFFFAOYSA-N 0.000 description 11
- 230000000704 physical effect Effects 0.000 description 11
- 238000005516 engineering process Methods 0.000 description 10
- 229910052786 argon Inorganic materials 0.000 description 8
- 238000007712 rapid solidification Methods 0.000 description 8
- 238000006073 displacement reaction Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 239000000203 mixture Substances 0.000 description 6
- 235000008429 bread Nutrition 0.000 description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 4
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical group [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 4
- 238000005470 impregnation Methods 0.000 description 4
- 238000009715 pressure infiltration Methods 0.000 description 4
- 239000011159 matrix material Substances 0.000 description 3
- 230000002093 peripheral effect Effects 0.000 description 3
- 235000015895 biscuits Nutrition 0.000 description 2
- 239000013078 crystal Substances 0.000 description 2
- 238000009740 moulding (composite fabrication) Methods 0.000 description 2
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000962 AlSiC Inorganic materials 0.000 description 1
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 description 1
- 239000003570 air Substances 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- 238000005275 alloying Methods 0.000 description 1
- 239000000274 aluminium melt Substances 0.000 description 1
- 235000011089 carbon dioxide Nutrition 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 239000000919 ceramic Substances 0.000 description 1
- 238000000748 compression moulding Methods 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000004100 electronic packaging Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 229930195733 hydrocarbon Natural products 0.000 description 1
- 150000002430 hydrocarbons Chemical class 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 230000008595 infiltration Effects 0.000 description 1
- 238000001764 infiltration Methods 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000001746 injection moulding Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 239000003921 oil Substances 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000002791 soaking Methods 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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Abstract
The invention discloses a preparation method and device of a high-volume fraction and high-intensity aluminum silicon carbide composite material. A silicon carbide porous preformed blank with the porosity of 20%-80% is degassed in vacuum in a mold with an insulation device, then melt aluminum liquid permeates into pores of the silicon carbide porous preformed blank under the co-action of a capillary force, an external pressure and a solidification contraction force, and then heat in the melt aluminum liquid is quickly conducted out by using a directional heat conduction technique so that the melt aluminum liquid is solidified along a direction opposite to the heat conduction direction; the melt aluminum liquid forms a great number of microcrystal in the micro-pores, and a stretch prestress is generated on the surface of a SiC frame after the melt aluminum liquid is solidified completely, and thus the mechanical properties, density and thermo-physical properties of the material are greatly improved; the method is simple in technique; and the prepared material has high density, good mechanical properties, high heat conductivity, low thermal expansion coefficient and good dimensional stability.
Description
Technical field
The invention belongs to metal-base composites forming technique category, a kind of method and device for preparing high-volume fractional, high-strength aluminium composite material of silicon carbide is provided especially.
Background technology
Aluminum silicon carbide composite material is because the heat physical properties of excellence such as its density is little, thermal conductivity is high, thermal expansivity is adjustable, specific rigidity is high, specific modulus is high and dimensional stability is good and structure and material and the electronic package material that mechanical mechanics property is widely used in aerospace, special equipment, precision instrument etc.Be usually less than 20% as silicon carbide volume fraction in the aluminum silicon carbide composite material of structured material use at present, adopt powder metallurgic method and stirring casting method to be prepared from, the material compactness of these two kinds of method preparations is not good enough, thermal conductivity is low, the thermal expansivity height still can not reach special dimensions such as aerospace and precision instrument fully to the requirement of structured material.The research of high-volume fractional aluminum silicon carbide composite material mainly lays particular emphasis on its heat physical properties, be used for Electronic Packaging, its preparation method mainly is pressure-free impregnation method and vacuum pressure infiltration method, by traditional ceramics preparation method moulding silicon carbide porous biscuits such as compression molding, injection molding or injection formings, biscuit obtains the high-volume fractional aluminum silicon carbide composite material through carry out pressure-free impregnation or vacuum pressure infiltration aluminium liquid behind the sintering in heat treatment furnace behind the furnace cooling.Because silicon carbide and molten aluminium are nonwetting, when being equipped with, the pressure-free impregnation legal system need add alloying element Si, Mg etc. to improve its wettability, and mold temperature height, soaking time are long, and the aluminium silicon carbide material interalloy crystal grain of preparation is thick, shrinkage cavity is arranged, easily produce Al when pore, impurity and high temperature
4C
3The fragility phase, thus greatly reduce mechanical property and the heat physical properties of material; Comparatively speaking, the mold temperature of vacuum pressure infiltration method is lower, a large amount of generations of fragility phase have been avoided, the heat physical properties of product is better, but the cooling direction of molten aluminum liquid in silicon carbide precast billet hole that adopts this legal system to be equipped with aluminium silicon carbide is by cool off (as schematic diagram 1) all around to the center, speed of cooling is uncontrollable, and the alloy grain of generation is inhomogeneous, and aluminium liquid solidifies complete back produces remaining stochastic distribution at material internal stress; And in process of cooling because peripheral aluminium liquid preferentially solidifies, and the center is in liquid state, the contraction that center molten aluminium when cooling produces, aluminium and SiC skeleton in conjunction with variation, produce pore, cause the mechanical property of matrix material and heat physical properties to descend.This technology is difficult to soak into when infiltration large size SiC sheet material, and heat physical properties, the mechanical property of product do not reach perfect condition.
Summary of the invention
The objective of the invention is to overcome the deficiency that prior art exists, a kind of employing vacuum pressure aluminising-directed heat conduction crystallite curing technology is provided, preparation has method and the corollary apparatus thereof of high-volume fractional, high compactness, high heat conductance and high-intensity large size aluminum silicon carbide composite material, this method is avoided pressure-free impregnation method and uncontrollable, the crystal grain skewness of vacuum pressure infiltration method preparation technology furnace cooling process interalloy grain-size, there are shortcomings such as pore in material internal, thereby improves mechanical mechanics property and the heat physical properties of aluminum silicon carbide composite material.
In order to realize above-mentioned technical purpose, technical scheme of the present invention is, a kind of preparation method of high-volume fractional high-strength aluminium composite material of silicon carbide, at first the silicon carbide porous precast billet with porosity 20-80% is assemblied in the mould, fill molten metal aluminium liquid or alloy aluminum liquid behind the high-temperature degassing, carry out cooling curing and the demoulding then, outer wall at mould wraps up thermal insulation layer, and when cooling curing, use heat-transfer device outer wall to be enclosed with in the mould of thermal insulation layer molten metal aluminium liquid or alloy aluminum liquid and carry out directed quick conductive and solidify, making molten metal aluminium liquid or alloy aluminum liquid serves as to solidify starting point to solidify gradually with heat conduction place that heat-transfer device was contacted.
200 ℃/min of heat conduction place cooling rate~900 ℃/min that heat-transfer device contacts, the cooling rate at thermal insulation layer parcel place is no more than 100 ℃/min.
The process of assembling precast billet and filling aluminum liquid is as follows:
A) the silicon carbide porous precast billet of porosity 20-80% is carried out surface treatment, place mould, then mould is fixed in the vacuum pressure aluminizing furnace, be warming up to 600-800 ℃ of insulation 2-6 hour;
B) the porous SiC precast billet that above-mentioned insulation is handled outgases under vacuum environment, and 500-800 ℃ of degassing temperature outgased time 0.1-2 hour; Degassing pressure 0.01-100Pa in the stove;
C) by impressed pressure, capillary pressure and the acting in conjunction of cooling convergent force molten metal aluminium liquid or alloy aluminum liquid are fully penetrated among the hole of silicon carbide porous precast billet, infiltrate in the process of porous SiC at molten aluminium or alloy aluminum melt, whole system continues to keep 0.1-15 minute to guarantee being full of molten aluminium or alloy aluminum melt in the micropore under 600-800 ℃ of temperature.
The direction of solidifying of molten metal aluminium liquid or alloy aluminum liquid is to be begun to solidify by the heat-transfer device contact position, and the rapid solidification direction is opposite with direction of heat flow, and in the inner micritization of SiC precast billet micropore, produces stretching prestress.
The quick conductive device comprises gas conduction such as air, nitrogen, argon gas, carbonic acid gas etc., liquid thermal conductivity such as water, thermal oil, paraffinic hydrocarbon, alcohols etc., heat conduction with phase change, modes such as heat pipe for thermal conductivity and semi-conductor heat conduction.
The control of cooling direction can be controlled according to product design, and the regular square structure is from end face or side cooling, and cylindrical structural cools off from end face, and tubular structure radially cools off from tube hub, and the hollow hemisphere structure is radially cooled off from the ball inboard.
A kind of preparation facilities of high-volume fractional high-strength aluminium composite material of silicon carbide, comprise be used to the mould that holds the silicon carbide porous precast billet, be enclosed with thermal insulation layer on the described mould outer wall, also comprise the heat-transfer device for directed cooling molten metal aluminium liquid or alloy aluminum liquid, described heat-transfer device is arranged in the mould or is close to the mould outer wall.
Described mould is cubes, is enclosed with thermal insulation layer on each face outer wall of mould, and described heat-transfer device is close to wherein outer wall setting of mould.
Described mould is tubular body arranged inside, is enclosed with thermal insulation layer on the mold cylinder outer wall, and heat-transfer device penetrates to the mold axis position and arranges.
Described mould is the hemisphere housing, is enclosed with thermal insulation layer on the mould housing outer side wall, and heat-transfer device is close to the setting of housing inner side-wall.
The present invention in having the silicon carbide porous precast billet of porosity 20-80% by vacuum outgas, molten aluminum liquid is filled in the constant temperature and pressure aluminising, form external phase, utilize the directed heat conduction of heat pipe to cool off fast simultaneously, molten aluminium or alloy aluminum melt form crystallite to the cooling of insulation end fast from the heat conduction end, thereby metallic aluminium is distributed in the SiC micropore with microlitic structure, and in whole material internal directional retraction, form stretching prestress on silicon carbide skeleton surface, reduce the material internal Residual Porosity, improve the compactness of aluminum silicon carbide composite material, mechanical mechanics property and heat physical properties (as schematic diagram 2), its obvious improvement is: adopt directed quick conductive technology to make metallic aluminium melt or alloy aluminum melt form crystallite in the SiC micropore, reduce matrix material residual porosity rate, improve the bonding strength of aluminium crystallite and SiC skeleton, form stretching prestress on SiC skeleton surface after molten aluminium or alloy aluminum melt solidifying are finished, directed heat conduction technology can prepare sheet material, bar, the AlSiC matrix material of tubing and hollow hemisphere structure.This technology can prepare silicon carbide volume fraction height, density height, physical strength height, aluminum silicon carbide composite material that heat physical properties is good.
The present invention compared with prior art has following advantage:
A. adopt the directed quick conductive technology generation of heat pipe for traditional furnace cooling behind porous SiC precast billet filling aluminum melt or the alloy aluminum melt, be conducive to molten aluminium or alloy aluminum melt and in micropore, form a large amount of crystallites, and combine closely on SiC skeleton surface, produce stretching prestress, thereby improve the physical strength of aluminium silicon carbide greatly.
B. adopt the constant temperature and pressure aluminizing technology, for the precast billet of thickness above 15mm, be conducive to form external phase, reduce the aluminium silicon carbide Residual Porosity, improve density.
C. the quick conductive technology adapts to the shaped piece aluminising of different geometric shapes, and prestress square is to controlled.
D. material density height is conducive to improve mechanical mechanics property and the heat physical properties of aluminum silicon carbide composite material, satisfies fields such as aerospace, precision instrument to the requirement of material heat physical properties and mechanical mechanics property.
Description of drawings
Fig. 1 is existing solidification mode synoptic diagram;
Fig. 2 solidifies synoptic diagram for cubes class mould of the present invention;
Fig. 3 solidifies synoptic diagram for tubular die of the present invention;
Fig. 4 solidifies synoptic diagram for hemisphere casing mold of the present invention;
Wherein 1 is that mould, 2 is that thermal insulation layer, 3 is that aluminium liquid entrance, 4 is that silicon carbide base substrate, 5 is that aluminium liquid passage, 6 is that heat-transfer device, 7 is the heat conduction direction.
Embodiment
Be intended to further specify the present invention below in conjunction with embodiment, and unrestricted the present invention.
With porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out adorning mould after the surface treatment; Place vacuum pressure to sink on the mould that the porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 10Pa, and the displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 20 minutes under the furnace pressure 15Pa; Add molten aluminium, under additional gas liquid blend pressure, molten aluminium infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 1 minute.Heat pipe is closely contacted with mould one end face, and all the other bread of mould are wrapped up in thermal insulation layer; The die face temperature is with the speed cooling of 600 ℃/min, and its lap cooling rate of mould is less than 100 ℃/min; Molten aluminium forms the aluminium crystallite at the fast cooling face, and along thermograde reverse direction rapid solidification, lowers the temperature after 5 minutes, the furnace cooling demoulding, the aluminium silicon carbide yield strength is 620MPa, thermal conductivity 205W/mK, the thermal expansivity 7.5 * 10 between the room temperature to 150 ℃
-6/ K.
With porosity 50%, thickness is that the silicon carbide porous precast billet of 20mm rectangular parallelepiped carries out adorning mould after the surface treatment; Place vacuum pressure to sink on the mould that the porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 10Pa, and the displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 1 minute under the furnace pressure 0.1Pa; Add molten aluminium, under additional gas liquid blend pressure, molten aluminium infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 2 minutes.Heat pipe is closely contacted with mould one end face, and all the other bread of mould are wrapped up in thermal insulation layer; The die face temperature is with the speed cooling of 400 ℃/min, and its lap cooling rate of mould is less than 100 ℃/min; Molten aluminium forms the aluminium crystallite at the fast cooling face, and along thermograde reverse direction rapid solidification, lowers the temperature after 5 minutes, the furnace cooling demoulding, the aluminium silicon carbide yield strength is 500MPa, thermal conductivity 218W/mK, the thermal expansivity 8.5 * 10 between the room temperature to 150 ℃
-6/ K.
With porosity 25%, thickness is that the silicon carbide porous precast billet of 15mm rectangular parallelepiped carries out adorning mould after the surface treatment; Place vacuum pressure to sink on the mould that the porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 1.0Pa, and the displacement furnace atmosphere is argon gas, is warming up to 700 ℃, is incubated 4 hours down at 700 ℃; Open vacuum system, the degassing is 30 minutes under 700 ℃ of temperature 50Pa furnace pressures; Add 102 alloy aluminum melts, under gas-liquid mixed pressure, 102 alloy aluminum melts infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 700 ℃ 1 minute.Heat pipe is closely contacted with mould one end face, and all the other bread of mould are wrapped up in thermal insulation layer; The die face temperature is with the speed cooling of 800 ℃/min, and its lap cooling rate of mould is less than 100 ℃/min; 102 alloy aluminum melts form the alloy aluminum crystallite at the fast cooling face, and along thermograde reverse direction rapid solidification, lower the temperature after 2 minutes, the furnace cooling demoulding, the aluminium silicon carbide yield strength is 580MPa, thermal conductivity 205W/mK, the thermal expansivity 7.0 * 10 between the room temperature to 150 ℃
-6/ K.
With porosity 50%, wall thickness is that the tubular silicon carbide porous preforming base of 10mm carries out adorning mould after the surface treatment; Place vacuum pressure to sink on the mould that tubulose porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 10Pa, and the displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 1 minute under the furnace pressure 0.1Pa; Add molten aluminium, under additional gas liquid blend pressure, 102 alloy aluminum melts infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 2 minutes.Be enclosed with thermal insulation layer on the mold cylinder outer wall, heat pipe passed mold center closely contact, mold center's temperature is with the speed cooling of 600 ℃/min, and the peripheral cooling rate of mould is less than 100 ℃/min; Molten aluminium radially forms the aluminium crystallite to outer wall, and rapid solidification was lowered the temperature after 5 minutes, the furnace cooling demoulding, and the aluminium silicon carbide yield strength is 680MPa, thermal conductivity 221W/mK, the thermal expansivity 8.5 * 10 between the room temperature to 150 ℃
-6/ K.
With porosity 30%, wall thickness is that the silicon carbide hollow hemisphere shape porous preforming base of 10mm carries out adorning mould after the surface treatment; Place vacuum pressure to sink on the mould that semisphere porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 10Pa, and the displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 1 minute under the furnace pressure 0.1Pa; Add molten aluminium, under additional gas liquid blend pressure, 102 alloy aluminum melts infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 2 minutes, the mould sphere arranges the thermal insulation layer insulation.The semisphere heat pipe is closely contacted with mould curved surface, and mold center's temperature is with the speed cooling of 800 ℃/min, and the peripheral cooling rate of the hemisphere of mould is less than 50 ℃/min; Molten aluminium radially forms the aluminium crystallite to outer wall, and rapid solidification was lowered the temperature after 5 minutes, the furnace cooling demoulding, and the aluminium silicon carbide yield strength is 590MPa, thermal conductivity 205W/mK, the thermal expansivity 7.5 * 10 between the room temperature to 150 ℃
-6/ K.
With porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out adorning mould after the surface treatment, the mould that the porous silicon carbide precast billet is housed is placed the heavy stove that oozes of vacuum pressure, being evacuated to furnace pressure is 10Pa, the displacement furnace atmosphere is argon gas, be warming up to 750 ℃, be incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 20 minutes under the furnace pressure 15Pa; Add molten aluminium, under additional gas liquid blend pressure, molten aluminium infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 1 minute.Nitrogen is from mould one end face fast-refrigerating, and all the other bread of mould are wrapped up in thermal insulation layer; The die face temperature is with the speed cooling of 600 ℃/min, and its lap cooling rate of mould is less than 100 ℃/min; Molten aluminium forms the aluminium crystallite at the fast cooling face, and along thermograde reverse direction rapid solidification, lowers the temperature after 5 minutes, the furnace cooling demoulding, the aluminium silicon carbide yield strength is 600MPa, thermal conductivity 203W/mK, the thermal expansivity 7.3 * 10 between the room temperature to 150 ℃
-6/ K.
Embodiment 7
With porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out adorning mould after the surface treatment, 5 insulations of mould; Place vacuum pressure to sink on the mould that the porous silicon carbide precast billet is housed and ooze stove, being evacuated to furnace pressure is 10Pa, and the displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours down at 750 ℃; Open vacuum system, 750 ℃ of temperature, the degassing is 20 minutes under the furnace pressure 15Pa; Add molten aluminium, under additional gas liquid blend pressure, 6061 molten aluminiums infiltrated in the porous silicon carbide precast billet, during aluminising temperature keep 750 ℃ 1 minute.Water coolant is from mould one end face fast-refrigerating, and all the other bread of mould are wrapped up in thermal insulation layer; The die face temperature is with the speed cooling of 600 ℃/min, and its lap cooling rate of mould is less than 100 ℃/min; Molten aluminium forms the aluminium crystallite at the fast cooling face, and along thermograde reverse direction rapid solidification, lowers the temperature after 5 minutes, the furnace cooling demoulding, the aluminium silicon carbide yield strength is 580MPa, thermal conductivity 203W/mK, the thermal expansivity 10.3 * 10 between the room temperature to 150 ℃
-6/ K.
Claims (7)
1. the preparation method of a high-volume fractional high-strength aluminium composite material of silicon carbide, at first the silicon carbide porous precast billet with porosity 20-80% is assemblied in the mould, fill molten metal aluminium liquid or alloy aluminum liquid behind the high-temperature degassing, carry out cooling curing and the demoulding then, it is characterized in that, outer wall at mould wraps up thermal insulation layer, and when cooling curing, use heat-transfer device outer wall to be enclosed with in the mould of thermal insulation layer molten metal aluminium liquid or alloy aluminum liquid and carry out directed quick conductive and solidify, making molten metal aluminium liquid or alloy aluminum liquid serves as to solidify starting point to solidify gradually with heat conduction place that heat-transfer device was contacted.
2. preparation method according to claim 1 is characterized in that,
200 ℃/min of heat conduction place cooling rate~900 ℃/min that heat-transfer device contacts, the cooling rate at thermal insulation layer parcel place is no more than 100 ℃/min.
3. preparation method according to claim 1 is characterized in that,
The process of assembling precast billet and filling aluminum liquid is as follows:
A) the silicon carbide porous precast billet of porosity 20-80% is carried out surface treatment, place mould, then mould is fixed in the vacuum pressure aluminizing furnace, be warming up to 600-800 ℃ of insulation 2-6 hour;
B) the porous SiC precast billet that above-mentioned insulation is handled outgases under vacuum environment, and 500-800 ℃ of degassing temperature outgased time 0.1-2 hour; Degassing pressure 0.01-100Pa in the stove;
C) by impressed pressure, capillary pressure and the acting in conjunction of cooling convergent force molten metal aluminium liquid or alloy aluminum liquid are fully penetrated among the hole of silicon carbide porous precast billet, infiltrate in the process of porous SiC at molten aluminium or alloy aluminum melt, whole system continues to keep 0.1-15 minute to guarantee being full of molten aluminium or alloy aluminum melt in the micropore under 600-800 ℃ of temperature.
4. the preparation facilities of a high-volume fractional high-strength aluminium composite material of silicon carbide, comprise be used to the mould that holds the silicon carbide porous precast billet, it is characterized in that, be enclosed with thermal insulation layer on the described mould outer wall, also comprise the heat-transfer device for directed cooling molten metal aluminium liquid or alloy aluminum liquid, described heat-transfer device is arranged in the mould or is close to the mould outer wall.
5. the preparation facilities of a kind of high-volume fractional high-strength aluminium composite material of silicon carbide according to claim 4, it is characterized in that, described mould is cubes, is enclosed with thermal insulation layer on each face outer wall of mould, and described heat-transfer device is close to wherein outer wall setting of mould.
6. the preparation facilities of a kind of high-volume fractional high-strength aluminium composite material of silicon carbide according to claim 4 is characterized in that, described mould is tubular body arranged inside, is enclosed with thermal insulation layer on the mold cylinder outer wall, and heat-transfer device penetrates to the mold axis position and arranges.
7. the preparation facilities of a kind of high-volume fractional high-strength aluminium composite material of silicon carbide according to claim 4 is characterized in that, described mould is the hemisphere housing, is enclosed with thermal insulation layer on the mould housing outer side wall, and heat-transfer device is close to the setting of housing inner side-wall.
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CN105047622A (en) * | 2014-05-02 | 2015-11-11 | 远东科技大学 | heat transfer structure, manufacturing method thereof and heat dissipation method thereof |
CN105331854A (en) * | 2015-11-30 | 2016-02-17 | 无锡大塘复合材料有限公司 | Aluminum alloy composite material and preparation method thereof |
CN107012346A (en) * | 2017-03-14 | 2017-08-04 | 郭和谦 | A kind of preparation method of the aluminium base of high temperature resistant low thermal coefficient of expansion/PMOS base complex layered materials |
CN111868008A (en) * | 2017-12-20 | 2020-10-30 | 福乐尼·乐姆宝公开有限公司 | Method for producing porous preforms with controlled porosity from silicon carbide and porous preforms of silicon carbide |
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CN102500748A (en) * | 2011-10-25 | 2012-06-20 | 中南大学 | Method for preparing aluminum silicon carbide composite material |
CN203307419U (en) * | 2013-05-20 | 2013-11-27 | 长沙艾思柯新材料科技有限公司 | Preparation device of aluminum silicon carbide composite material with high volume fraction and high strength |
Cited By (7)
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CN103939509A (en) * | 2014-04-22 | 2014-07-23 | 浙江天乐新材料科技有限公司 | Al/Sic and Cu/Sic composite material friction pair used for railway vehicle and manufacturing method thereof |
CN105047622A (en) * | 2014-05-02 | 2015-11-11 | 远东科技大学 | heat transfer structure, manufacturing method thereof and heat dissipation method thereof |
CN105047622B (en) * | 2014-05-02 | 2018-03-20 | 远东科技大学 | Heat transfer structure, manufacturing method thereof and heat dissipation method thereof |
CN105331854A (en) * | 2015-11-30 | 2016-02-17 | 无锡大塘复合材料有限公司 | Aluminum alloy composite material and preparation method thereof |
CN107012346A (en) * | 2017-03-14 | 2017-08-04 | 郭和谦 | A kind of preparation method of the aluminium base of high temperature resistant low thermal coefficient of expansion/PMOS base complex layered materials |
CN111868008A (en) * | 2017-12-20 | 2020-10-30 | 福乐尼·乐姆宝公开有限公司 | Method for producing porous preforms with controlled porosity from silicon carbide and porous preforms of silicon carbide |
CN111868008B (en) * | 2017-12-20 | 2022-12-23 | 乐姆宝公开有限公司 | Method for producing porous preforms with controlled porosity from silicon carbide and porous preforms of silicon carbide |
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