CN203307419U - Preparation device of aluminum silicon carbide composite material with high volume fraction and high strength - Google Patents
Preparation device of aluminum silicon carbide composite material with high volume fraction and high strength Download PDFInfo
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- CN203307419U CN203307419U CN2013202731892U CN201320273189U CN203307419U CN 203307419 U CN203307419 U CN 203307419U CN 2013202731892 U CN2013202731892 U CN 2013202731892U CN 201320273189 U CN201320273189 U CN 201320273189U CN 203307419 U CN203307419 U CN 203307419U
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- silicon carbide
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Abstract
The utility model discloses a preparation device of an aluminum silicon carbide composite material with high volume fraction and high strength. The preparation device comprises a die for containing a silicon carbide porous pre-forging blank. The preparation device is characterized in that an insulating layer is coated on the outer wall of the die; the preparation device also comprises a heat conduction device which is used for directionally cooling molten metal aluminum liquid; the heat conduction device is arranged inside the die or tightly attached to the outer wall of the die. By using the device, the mechanical property, the compactness and the thermophysical characteristic of the material can be greatly improved.
Description
Technical field
The utility model belongs to metal-base composites forming technique category, and a kind of device for preparing high-volume fractional, high strength aluminum silicon carbide composite material is provided especially.
Background technology
Aluminum silicon carbide composite material is because its density is little, thermal conductivity is high, thermal expansivity is adjustable, specific rigidity is high, specific modulus is high and the heat physical properties of the excellence such as good stability of the dimension and structure and material and the electronic package material that mechanical mechanics property is widely used in aerospace, special equipment, precision instrument etc.As silicon carbide volume fraction in the aluminum silicon carbide composite material of structured material use, be usually less than 20% at present, adopt powder metallurgic method and stirring casting method to be prepared from, material compactness prepared by these two kinds of methods is not good enough, thermal conductivity is low, thermal expansivity is high, still can not reach the requirement of the special dimensions such as aerospace and precision instrument to structured material fully.The research of high-volume fractional aluminum silicon carbide composite material mainly lays particular emphasis on its heat physical properties, for Electronic Packaging, its preparation method is mainly 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 carries out pressure-free impregnation or vacuum pressure infiltration aluminium liquid in heat treatment furnace after sintering, after furnace cooling, obtain the high-volume fractional aluminum silicon carbide composite material.Due to silicon carbide and molten aluminium nonwetting, the pressure-free impregnation legal system need add silicon addition, Mg etc. to improve its wettability when standby, and mold temperature is high, soaking time is long, the aluminium silicon carbide material interalloy coarse grains of preparation, when being arranged, shrinkage cavity, pore, impurity and high temperature easily produces Al
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 adopting the cooling direction of molten aluminum liquid in silicon carbide precast billet hole of the standby aluminium silicon carbide of this legal system is by surrounding cooling to center (as schematic diagram 1), speed of cooling is uncontrollable, and the alloy grain of generation is inhomogeneous, after aluminium liquid solidifies fully, produces the stress of remaining stochastic distribution at material internal; And in process of cooling because peripheral aluminium liquid preferentially solidifies, center is in liquid state, the contraction produced when the center molten aluminium is cooling, aluminium and SiC skeleton in conjunction with variation, produce pore, cause the mechanical property of matrix material and heat physical properties to descend.This technique is difficult to soak into when infiltration large size SiC sheet material, heat physical properties, the mechanical property of product do not reach perfect condition, therefore develops a kind of suitable technique and supporting device is current this area urgent problem.
The utility model content
The purpose of this utility model is to overcome the deficiency that prior art exists, provide a kind of prepare have high-volume fractional, the device of high compactness, high heat conductance and high-intensity large size aluminum silicon carbide composite material.
In order to realize above-mentioned technical purpose, the technical solution of the utility model is, a kind of preparation facilities of high-volume fractional high strength aluminum silicon carbide composite material, comprise be used to holding the mould of silicon carbide porous precast billet, on described mould outer wall, be enclosed with thermal insulation layer, also comprise the heat-transfer device for directed cooling molten metal aluminium liquid or alloy aluminum liquid, described heat-transfer device is arranged in 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 Loadings On Hemispherical Shell, 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.
Adopt said apparatus to carry out the preparation method of high-volume fractional high strength aluminum silicon carbide composite material, a kind of preparation method of high-volume fractional high strength aluminum silicon carbide composite material, at first the silicon carbide porous precast billet of porosity 20-80% is assemblied in mould, after high-temperature degassing, fill molten metal aluminium liquid or alloy aluminum liquid, then carry out cooling curing the demoulding, on the outer wall of mould, wrap up thermal insulation layer, and when cooling curing, use heat-transfer device to be enclosed with in the mould of thermal insulation layer molten metal aluminium liquid or alloy aluminum liquid on to outer wall and carry out directed quick conductive and solidify, making molten metal aluminium liquid or alloy aluminum liquid take heat conduction place that heat-transfer device was contacted solidifies gradually as solidifying starting point, and in the silicon carbide micropore, form fine and close crystallite, and the 200 ℃/min of heat conduction place cooling rate that heat-transfer device contacts～900 ℃/min, the cooling rate at thermal insulation layer parcel place is no more than 100 ℃/min.
The process of described vacuum pressure alumetizing process is as follows:
A) the silicon carbide porous precast billet of porosity 20-80% is carried out to surface treatment, be placed in 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 of above-mentioned insulation being processed, degassed under vacuum environment, degassed temperature 500-800 ℃, degassed time 0.1-2 hour; Degassed pressure 0.01-100Pa in stove;
C) by impressed pressure, capillary pressure and cooling convergent force acting in conjunction, molten metal aluminium liquid or alloy aluminum liquid are fully penetrated among the hole of silicon carbide porous precast billet, in the process of molten aluminium or alloy aluminum melt infiltration porous SiC, whole system continues to keep at 600-800 ℃ of temperature 0.1-15 minute to guarantee being full of molten aluminium or alloy aluminum melt in micropore.
The direction of solidifying of molten metal aluminium liquid or alloy aluminum liquid is to be started 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, the modes such as heat pipe for thermal conductivity and semi-conductor heat conduction.
Cooling direction is controlled and can be controlled according to product design, and the regular square structure is cooling from end face or side, and cylindrical structural is cooling from end face, and tubular structure is radially cooling from tube hub, and the hollow hemisphere structure is radially cooling from the ball inboard.
Utilize the utility model 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 simultaneously the directed heat conduction of heat pipe cooling fast, molten aluminium is held cooling formation crystallite to insulation 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, on silicon carbide skeleton surface, form stretching prestress, 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 significant progressive being: adopt directed quick conductive technology to make the metallic aluminium melt form crystallite in the SiC micropore, reduce matrix material residual porosity rate, improve the bonding strength of aluminium crystallite and SiC skeleton, after having solidified, molten aluminium forms stretching prestress on SiC skeleton surface, directed heat conduction technology can prepare sheet material, bar, the AlSiC matrix material of tubing and hollow hemisphere structure.This technology can prepare the aluminum silicon carbide composite material that the silicon carbide volume fraction is high, density is high, physical strength is high, heat physical properties is good, and the utility model provides device for realizing above-mentioned effect.
The accompanying drawing explanation
Fig. 1 is existing solidification mode schematic diagram;
Fig. 2 is that the utility model cubes class mould solidifies schematic diagram;
Fig. 3 is that the utility model tubular body arranged inside class mould solidifies schematic diagram;
Fig. 4 is that the utility model Loadings On Hemispherical Shell class mould solidifies schematic diagram;
Wherein 1 is that mould, 2 is that thermal insulation layer, 3 is that aluminium liquid entrance, 4 is that silicon carbide green body, 5 is that aluminium liquid passage, 6 is that heat-transfer device, 7 is the heat conduction direction.
Embodiment
Below in conjunction with embodiment, be intended to further illustrate the utility model, and unrestricted the utility model.
By porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out filling mould after surface treatment; The mould that the porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 10Pa, and displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 15Pa degassed 20 minutes; 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.By heat pipe and mould one end face close contact, 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 room temperature to 150 ℃
-6/ K.
By porosity 50%, thickness is that the silicon carbide porous precast billet of 20mm rectangular parallelepiped carries out filling mould after surface treatment; The mould that the porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 10Pa, and displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 0.1Pa degassed 1 minute; 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.By heat pipe and mould one end face close contact, 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 room temperature to 150 ℃
-6/ K.
By porosity 25%, thickness is that the silicon carbide porous precast billet of 15mm rectangular parallelepiped carries out filling mould after surface treatment; The mould that the porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 1.0Pa, and displacement furnace atmosphere is argon gas, is warming up to 700 ℃, is incubated 4 hours under 700 ℃; Open vacuum system, under 700 ℃ of temperature 50Pa furnace pressures degassed 30 minutes; 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.By heat pipe and mould one end face close contact, 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 room temperature to 150 ℃
-6/ K.
By porosity 50%, wall thickness is that the tubular silicon carbide porous preforming base of 10mm carries out filling mould after surface treatment; The mould that tubulose porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 10Pa, and displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 0.1Pa degassed 1 minute; 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.On the mold cylinder outer wall, be enclosed with thermal insulation layer, heat pipe is passed to mold center's close 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, 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 room temperature to 150 ℃
-6/ K.
By porosity 30%, wall thickness is that the silicon carbide hollow hemisphere shape porous preforming base of 10mm carries out filling mould after surface treatment; The mould that semisphere porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 10Pa, and displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 0.1Pa degassed 1 minute; 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.By semisphere heat pipe and mould curved surface close contact, 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, 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 room temperature to 150 ℃
-6/ K.
By porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out filling mould after surface treatment, the mould that the porous silicon carbide precast billet is housed is placed in to 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 ℃, insulation is 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 15Pa degassed 20 minutes; 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 room temperature to 150 ℃
-6/ K.
By porosity 37%, thickness is that the rectangular parallelepiped silicon carbide porous precast billet of 15mm carries out filling mould after surface treatment, 5 insulations of mould; The mould that the porous silicon carbide precast billet is housed is placed in to vacuum pressure is heavy oozes stove, being evacuated to furnace pressure is 10Pa, and displacement furnace atmosphere is argon gas, is warming up to 750 ℃, is incubated 2 hours under 750 ℃; Open vacuum system, 750 ℃ of temperature, under furnace pressure 15Pa degassed 20 minutes; 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 room temperature to 150 ℃
-6/ K.
Claims (4)
1. the preparation facilities of a high-volume fractional high strength aluminum silicon carbide composite material, comprise be used to holding the mould of silicon carbide porous precast billet, it is characterized in that, on described mould outer wall, be enclosed with thermal insulation layer, also comprise the heat-transfer device for directed cooling molten metal aluminium liquid or alloy aluminum liquid, described heat-transfer device is arranged in mould or is close to the mould outer wall.
2. the preparation facilities of a kind of high-volume fractional high strength aluminum silicon carbide composite material according to claim 1, 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.
3. the preparation facilities of a kind of high-volume fractional high strength aluminum silicon carbide composite material according to claim 1, 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.
4. the preparation facilities of a kind of high-volume fractional high strength aluminum silicon carbide composite material according to claim 1, is characterized in that, described mould is Loadings On Hemispherical Shell, 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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| CN2013202731892U CN203307419U (en) | 2013-05-20 | 2013-05-20 | Preparation device of aluminum silicon carbide composite material with high volume fraction and high strength |
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| CN2013202731892U CN203307419U (en) | 2013-05-20 | 2013-05-20 | Preparation device of aluminum silicon carbide composite material with high volume fraction and high strength |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276277A (en) * | 2013-05-20 | 2013-09-04 | 长沙艾思柯新材料科技有限公司 | Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material |
| CN103600053A (en) * | 2013-12-06 | 2014-02-26 | 湖南航天诚远精密机械有限公司 | Accurate forming tool of aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate |
-
2013
- 2013-05-20 CN CN2013202731892U patent/CN203307419U/en not_active Withdrawn - After Issue
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103276277A (en) * | 2013-05-20 | 2013-09-04 | 长沙艾思柯新材料科技有限公司 | Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material |
| CN103276277B (en) * | 2013-05-20 | 2015-02-25 | 长沙艾思柯新材料科技有限公司 | Preparation method and device of high-volume fraction and high-intensity aluminum silicon carbide composite material |
| CN103600053A (en) * | 2013-12-06 | 2014-02-26 | 湖南航天诚远精密机械有限公司 | Accurate forming tool of aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate |
| CN103600053B (en) * | 2013-12-06 | 2015-05-06 | 湖南航天诚远精密机械有限公司 | Accurate forming tool of aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate |
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| AV01 | Patent right actively abandoned |
Granted publication date: 20131127 Effective date of abandoning: 20150225 |
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| RGAV | Abandon patent right to avoid regrant |