CN103600053B - Accurate forming tool of aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate - Google Patents
Accurate forming tool of aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate Download PDFInfo
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- CN103600053B CN103600053B CN201310650422.9A CN201310650422A CN103600053B CN 103600053 B CN103600053 B CN 103600053B CN 201310650422 A CN201310650422 A CN 201310650422A CN 103600053 B CN103600053 B CN 103600053B
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Abstract
The invention discloses an accurate forming tool of an aluminum silicon carbide composite IGBT (insulated gate bipolar translator) baseplate. The accurate forming tool comprises an aluminizing box, a guiding pipe and positioning devices, wherein the upper part of the guiding pipe is fixedly connected with a bottom surface of the aluminizing box; the upper part of the aluminizing box is provided with a cover plate which is placed in the aluminizing box, the lower part of the aluminizing box is provided with a bottom plate which is placed in the aluminizing box, the four sides of the aluminizing box are all provided with side plates which are placed in the aluminizing box; the bottom plate is provided with an impregnation flow channel of a molten aluminum alloy liquid; at least two deformation-proof partition plates are arranged among the side plates; the guiding pipe is externally sleeved with a heat preservation device. The accurate forming tool provided by the invention has the advantages that the heat preservation device can reduce the freezing rate of an alloy liquid in the guiding pipe, a final freezing region can be controlled in the position of the heat preservation device, the aluminum alloy liquid can be used for feeding a baseplate material in the aluminizing box in time, and thus a shrinkage cavity of the material is avoided; the positioning devices can strictly control the aluminum covering quantity of the two surfaces of a baseplate, the processing time is short, the cost is low, and the production efficiency is high; the aluminizing flow channel can be used for eliminating a crackle of the material and non-uniformity of an aluminum tape and the material.
Description
Technical field
The present invention relates to the forming field of aluminum silicon carbide composite material substrate, especially relate to a kind of aluminum silicon carbide composite material IGBT substrate vacuum pressure infiltration precise forming frock.
Background technology
Aluminum silicon carbide composite material is the composite of a kind of advanced person, has that density is low, thermal conductivity is high, thermal coefficient of expansion is low, rigidity advantages of higher, is widely used in Electronic Packaging field and aerospace field etc.
Aluminum silicon carbide composite material IGBT substrate needs are two-sided covers aluminium, and needs to control its deflection.At present, when adopting the method for vacuum pressure infiltration to prepare this composite, adopt stainless steel frock and stainless steel separator, its cost is low, but differ comparatively large with the thermal coefficient of expansion of carborundum due to aluminium, and a large amount of shrinkage cavity of easy generation, affects product quality; Secondly, the deflection of IGBT substrate is comparatively large, and very difficult realization is evenly two-sided covers aluminium.According to ceramic separator, not only there is shrinkage cavity in position, intermediate portion in prepared IGBT substrate, and ceramic separator is difficult to remove.
Chinese patent 200780014043.3 discloses one " heat radiation part of aluminum/silicon carbide complex and this complex of use ", its manufacture method is, upper aluminium oxide is first padded on the two sides of carborundum prefabricated component or silica is the fiber cloth of main component, demoulding steel plate is pressed from both sides again in the outside of this fiber cloth, cross layered, clamp at outermost layer two blocks of steel plates and tighten with screw rod.The key of this patent is that aluminium oxide or silica are that the fiber cloth of main component is clipped on silicon carbide IGBT substrate prefabricated component, by adjusting the number of plies of fiber cloth, reaches the object of the thickness of aluminum alloy in adjustment aluminium silicon carbide IGBT substrate.Alumina fibre is adopted to be clipped on silicon carbide IGBT substrate prefabricated component, clamp with the corrosion resistant plate brushing releasing agent again, tighten with screw rod, aluminising in vacuum pressure impregnation stove, can realize that aluminium silicon carbide IGBT substrate is two-sided covers aluminium alloy, but the aluminium alloy layer formed is not fine and close, there is a large amount of micropores.In addition, the aluminizing method adopted, the machining that follow-up needs are a large amount of, and for ensureing two-sided alclad evenly and not exposed SiC, difficulty of processing is very large, and processing cost is very high.
Summary of the invention
The technical problem to be solved in the present invention is, overcomes the above-mentioned defect that prior art exists, and provides the aluminising frock of the aluminium silicon carbide IGBT substrate composite vacuum pressure infiltration that a kind of technique is simple, zero-fault, allowance are few, the scope of application is wide.
The technical solution adopted for the present invention to solve the technical problems is:
A kind of aluminum silicon carbide composite material IGBT substrate precise forming frock, is characterized in that, the positioner comprising aluminising box, mozzle and can position SiC prefabricated component, mozzle top and aluminising box bottom surface affixed; Mozzle bottom inserts in the container that molten aluminium alloy liquid is housed; Described aluminising box top is provided with the cover plate be placed in aluminising box, and aluminising box bottom is provided with the base plate be placed in aluminising box, and aluminising box four side is equipped with the side plate be placed in aluminising box, described base plate has the infiltration runner of molten aluminium alloy liquid; Be equipped with the dividing plate of at least two deformation resistant between described side plate, described mozzle outer cover has the attemperator of the aluminum alloy melt setting rate that can reduce in mozzle, fits in attemperator top and aluminising box bottom surface.
Further, described attemperator is the cylinder sleeve that inside is filled with asbestos.
Further, described cover plate and base plate all have positioner mounting groove; Positioner is loaded in described positioner mounting groove.
Further, described positioner can be the location-plate that has locating groove, and the end of SiC prefabricated component is placed in locating groove; The shape of described locating groove is tooth shape, is located by SiC prefabricated component, realize the accurate control to the two-sided alclad thickness of aluminium silicon carbide substrate by the size and angle controlling locating groove.
Further, described positioner also can be screw or alignment pin, is located by SiC prefabricated component, thus realize the control to alclad thickness by the length of screw or the thickness of alignment pin.
Further, described infiltration runner comprises a total runner and at least two runners, total runner is located at base plate center, each runner is distributed on base plate, total runner is connected with each runner by the groove that base plate processes, the cross sectional shape of runner is, the square of diameter to be the circle of 6 mm-10mm or the length of side be 6 mm-10mm.
Further, described side plate, cover plate, base plate and dividing plate are by density>=1.8g/cm
3graphite make, at high temperature only have minimum expansion or bending, deformation resistant ability is strong.
Further, described mozzle top and the affixed mode of aluminising box bottom surface are for welding; Aluminising box and mozzle are made by steel material.
Further, described block board thickness is 5mm-10mm, and two-sided all painting of dividing plate is brushed with releasing agent.
Further, described aluminising box is high temperature resistant stainless steel aluminising box, can bear 1000 DEG C of high temperature.
Further, described mozzle is high temperature resistant stainless steel mozzle, can bear 1000 DEG C of high temperature equally.
Further, described side plate and and the SiC prefabricated component that is close to of side plate between be spaced apart 0.5mm-1mm.
Further, described dividing plate and and the SiC prefabricated component that is close to of dividing plate between be spaced apart 0.5mm-1mm.
During use, be positioned in aluminising box by SiC prefabricated component, be spaced from each other with dividing plate, positioner is all loaded onto in SiC prefabricated component two ends, is positioned SiC prefabricated component by positioner; During infiltration, mozzle is inserted in the melting aluminum aluminium alloy be loaded with in the container (as crucible) of aluminum alloy melt, aluminising under pressure, pressure is applied by high pressure nitrogen, through the pressurize of 3-5min, dwell pressure 7-9MPa, pressurize temperature 750-800 DEG C, the aluminum alloy melt of melting can enter in aluminising box under the effect of the pressure, aluminum alloy melt infiltrates SiC prefabricated component, obtains the aluminum silicon carbide composite material substrate of precise forming after aluminum alloy melt solidifies.
The present invention has following beneficial effect:
(1) the outer field attemperator of described mozzle, the setting rate of the aluminium alloy in mozzle can be reduced, can realize final set Region control at guarantee attemperator place, be beneficial to ensure that aluminum alloy melt carries out feeding to the baseplate material in aluminising box in time, avoid the shrinkage cavity of material, improve the quality of material.
(2) described SiC prefabricated component positioner can in strict accordance with product size require control substrate two-sided cover aluminum amount, thus reduce subsequent mechanical processing time, reduce costs, enhance productivity.
(3) base plate having an aluminising runner can eliminate the crackle of material and aluminium strip and discontinuity of material.Can ensure that aluminum alloy melt circulation is smooth and easy by the aluminising runner on base plate, by runner, aluminum alloy melt is shunted, when being conducive to reducing infiltration, aluminum alloy melt is to the impulsive force of SiC prefabricated component, reduces the possibility that SiC prefabricated component is thrust by powerful impulsive force, eliminates crackle and aluminium strip; Each runner is uniformly distributed on base plate, can realize, to the synchronous aluminising of all SiC prefabricated components, eliminating discontinuity of material.
(4) described dividing plate selects graphite to make, and its expansion at high temperature, with bending very little, high temperature resistant good with deformation resistant sexuality, can reduce the distortion of material; Secondly, its good heat conductivity, can discharge the latent heat of solidification of aluminium alloy fast, eliminates internal base plate and solidifies the adverse effects such as the shrinkage cavity brought slowly; The releasing agent of graphite septum external coating, is conducive to being separated of substrate and graphite septum, reduces processing cost.
The present invention is easily manufactured, and cost is low, and efficiency is high, applied widely, and especially more applicable for needing the two-sided substrate covering aluminium, environmentally safe, can realize suitability for industrialized production, and production and processing cost is low.
Accompanying drawing explanation
Fig. 1 is the overall generalized section of aluminum silicon carbide composite material IGBT substrate precise forming frock;
Fig. 2 is the structural representation of the base plate section offering infiltration runner;
Fig. 3 is the structural representation of positioner.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described.
Embodiment 1:
With reference to Fig. 1, a kind of aluminum silicon carbide composite material IGBT substrate precise forming frock, the positioner 8 comprising aluminising box 1, mozzle 2 and can position SiC prefabricated component, mozzle 2 top is welded with aluminising box 1 bottom surface, and mozzle 2 bottom inserts in the container that molten aluminium alloy liquid is housed; Described aluminising box 1 top is provided with the cover plate 4 be placed in aluminising box 1, aluminising box 1 bottom is provided with the base plate 5 be placed in aluminising box 1, aluminising box 1 four side is equipped with the side plate 3 be placed in aluminising box 1, described base plate 5 has the infiltration runner of molten aluminium alloy liquid, by size, the layout of design infiltration runner, realize the shrinkage cavity, crackle etc. of eliminating material; Be equipped with the dividing plate 6 of six deformation resistant between described side plate 3, described mozzle 2 outer cover has the attemperator 9 of the aluminum alloy melt setting rate that can reduce in mozzle 2, fits in attemperator 9 top and aluminising box 1 bottom surface.
During use, be positioned over by SiC prefabricated component 7 in aluminising box 1, be spaced from each other with dividing plate 6, positioner 8 is all loaded onto at SiC prefabricated component 7 two ends, is positioned by positioner 8 pairs of SiC prefabricated components 7; During infiltration, mozzle 2 is inserted in the melting aluminum aluminium alloy be loaded with in the container (as crucible 10) of aluminum alloy melt, aluminising under pressure, pressure is applied by high pressure nitrogen, through the pressurize of 4min, dwell pressure 8MPa, pressurize temperature 780 DEG C, the aluminum alloy melt of melting can enter in aluminising box 1 under the effect of the pressure, aluminum alloy melt infiltrates SiC prefabricated component 7, obtains the aluminum silicon carbide composite material substrate of precise forming after aluminum alloy melt solidifies.The existence of attemperator 9, the setting rate of the aluminium alloy in mozzle can be reduced, final set Region control can be realized to ensure attemperator place, be beneficial to ensure that aluminum alloy melt carries out feeding to the baseplate material in aluminising box in time, avoid the shrinkage cavity of material, improve the quality of material.
Described attemperator 9 is the inner cylinder sleeve being filled with asbestos.
Described side plate 3, cover plate 4, base plate 5 and dividing plate 6 are by density>=1.8g/cm
3graphite make; Dividing plate 6 selects graphite to make, and its expansion at high temperature, with bending very little, high temperature resistant good with deformation resistant sexuality, can reduce the distortion of material; Secondly, its good heat conductivity, can discharge the latent heat of solidification of aluminium alloy fast, eliminates internal base plate and solidifies the adverse effects such as the shrinkage cavity brought slowly.
Two-sided all painting of described dividing plate 6 is brushed with releasing agent, is conducive to being separated of substrate and graphite septum, reduces processing cost.
The affixed mode of described mozzle 2 top and aluminising box 1 bottom surface is for welding; Aluminising box 1 and mozzle 2 are made by steel material.
With reference to Fig. 2, described infiltration runner comprises a total runner 12 and ten runners 11, total runner 12 is located at base plate 5 center, each runner 11 is distributed on base plate 5, total runner 12 is connected with each runner 11 by the groove that base plate 5 processes, the cross sectional shape of runner is, diameter is the circle of 8mm or the length of side is the square of 8mm.
The existence of aluminising runner, can eliminate the crackle of material and aluminium strip and discontinuity of material.Aluminising runner is conducive to ensureing that aluminum alloy melt circulation is smooth and easy, shunted by runner 11 pairs of aluminum alloy melts, when being conducive to reducing infiltration, aluminum alloy melt is to the impulsive force of SiC prefabricated component 7, reduces the possibility that SiC prefabricated component 7 is thrust by powerful impulsive force, eliminates crackle and aluminium strip; Each runner 11 is uniformly distributed on base plate 5, can realize, to the synchronous aluminising of all SiC prefabricated components 7, eliminating discontinuity of material.
Side plate 3, cover plate 4 and band infiltration runner base plate 5 between connected by screw fastening, described cover plate 4 and base plate 5 all have positioner mounting groove; Positioner 8 is loaded in described positioner mounting groove.
This example is manufactured size is 130mm × 140mm × 5mm IGBT substrate, every box infiltrates the frock of 7 pieces, aluminising box appearance and size is: 160mm × 160mm × 125mm, two blocks of side plates are of a size of: 159mm × 159mm × 10mm, another two blocks of side plates are of a size of: 104mm × 159mm × 10mm, cover plate and base plate are of a size of: 104mm × 139mm × 10mm, dividing plate is of a size of 130mm × 140mm × 8.7mm, SiC prefabricated component is of a size of 130mm × 140mm × 4.8mm, and mozzle is of a size of: Φ 50mm × 360mm.The manufacturing process of frock is as follows:
(1) steel plate cutting, is formed stainless steel sheet|, is made 5 faces (end face and four sides) of aluminising box, 5 of aluminising box faces (end face and four sides) welded each other, and check sealing by stainless steel sheet|;
(2) at aluminising box 1 mounted inside graphite cover plate 4, side plate 3 and dividing plate 6, and positioner is installed in the positioner mounting groove of cover plate 4;
(3) by SiC prefabricated component 7 pieces of insertion positioner 8 places;
(4) base plate 5 having infiltration runner is loaded onto;
(5) assemble complete, last face of aluminising box 1 (i.e. bottom surface) and mozzle 2 are welded, and checks sealing;
(6) when infiltrating, attemperator 9 is set to mozzle 2 place.
After frock making completes, aluminium alloy is put in crucible 10, during infiltration, mozzle inserts in the aluminum alloy melt of fusing in crucible 10, aluminising under pressure, pressure is applied by high pressure nitrogen, through the pressurize of 4min, dwell pressure 8MPa, pressurize temperature 780 DEG C, the aluminum alloy melt of (parameter in embodiment should be a concrete value) melting can enter into aluminising box 1 under the effect of the pressure, shunted by runner 11 at total runner mouth 12 place, simultaneously to the position filling aluminum aluminium alloy of 7 blocks of prefabricated components, aluminum alloy melt infiltrates SiC prefabricated component 7, form aluminum silicon carbide composite material, after solidifying, the aluminising box of frock is removed, after SiC prefabricated component 7 is separated with graphite septum, the aluminum silicon carbide composite material substrate of precise forming can be obtained.
With reference to Fig. 3, described positioner 8 is a location-plate having locating groove 13, and the end of SiC prefabricated component 7 is placed in locating groove 13.The shape of described locating groove 13 is tooth shape, is located by SiC prefabricated component 7, realize the accurate control to the two-sided alclad thickness of aluminium silicon carbide substrate by the size and angle controlling locating groove 13.Positioner 8 is point cantact, and the shape of positioner 8 is not limited thereto, and as positioner also can be screw or alignment pin etc., is located by SiC prefabricated component, thus realize the control to alclad thickness by the length of screw or the thickness of alignment pin.
The thickness of the two-sided alclad of aluminum silicon carbide composite material substrate adopting this frock to prepare is controlled, and substrate produces without shrinkage cavity, the good physical properties such as material thermal conductivity, thermal coefficient of expansion, intensity.
Embodiment 2:
The difference of the present embodiment and embodiment 1 is:
This example is manufactured size is 140mm × 190mm × 5mmIGBT substrate, every box infiltrates the frock of 7 pieces, aluminising box appearance and size is: 160mm × 210mm × 125mm, two blocks of side plates are of a size of: 159mm × 209mm × 10mm, another two blocks of side plates are of a size of: 104mm × 209mm × 10mm, cover plate and base plate are of a size of: 104mm × 189mm × 10mm, dividing plate is of a size of 140mm × 190mm × 8.7mm, SiC prefabricated component is of a size of 140mm × 190mm × 4.8mm, and mozzle is of a size of: Φ 50mm × 360mm.
Installation step is identical with embodiment 1 with aluminising process, can obtain the precise forming IGBT substrate that allowance is few equally.
All the other are with embodiment 1.
Claims (8)
1. an aluminum silicon carbide composite material IGBT substrate precise forming frock, is characterized in that, the positioner comprising aluminising box, mozzle and can position SiC prefabricated component, mozzle top and aluminising box bottom surface affixed; Mozzle bottom inserts in the container that molten aluminium alloy liquid is housed; Described aluminising box top is provided with the cover plate be placed in aluminising box, and aluminising box bottom is provided with the base plate be placed in aluminising box, and aluminising box four side is equipped with the side plate be placed in aluminising box, described base plate has the infiltration runner of molten aluminium alloy liquid; Be equipped with the dividing plate of at least two deformation resistant between described side plate, described mozzle outer cover has the attemperator of the aluminum alloy melt setting rate that can reduce in mozzle, fits in attemperator top and aluminising box bottom surface;
Arranged in parallel between each dividing plate, also arranged in parallel between dividing plate and side plate.
2. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 1, it is characterized in that, described attemperator is the cylinder sleeve that inside is filled with asbestos.
3. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 1 and 2, is characterized in that, described cover plate and base plate all have positioner mounting groove; Positioner is loaded in described positioner mounting groove.
4. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 3, it is characterized in that, described positioner is a location-plate having locating groove, and the end of SiC prefabricated component is placed in locating groove; The shape of described locating groove is tooth shape.
5. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 3, it is characterized in that, described positioner is screw or alignment pin.
6. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 1 and 2, it is characterized in that, described infiltration runner comprises a total runner and at least two runners, total runner is located at base plate center, each runner is distributed on base plate, total runner is connected with each runner by the groove that base plate processes, and the cross sectional shape of runner is, the square of diameter to be the circle of 6 mm-10mm or the length of side be 6 mm-10mm.
7. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 1 and 2, it is characterized in that, described side plate, cover plate, base plate and dividing plate are by density>=1.8g/cm
3graphite make.
8. aluminum silicon carbide composite material IGBT substrate precise forming frock according to claim 1, is characterized in that, the thickness of described dividing plate is 5mm-10mm, and two-sided all painting of dividing plate is brushed with releasing agent.
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