CN1644276A - Method for producing high-volume fractional silicon-carbide particle reinforced aluminium-base composite material member - Google Patents
Method for producing high-volume fractional silicon-carbide particle reinforced aluminium-base composite material member Download PDFInfo
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Abstract
A technology for preparing the silicon carbide particles reinforced Al-based workpiece (SiCp/Al) with high volume fraction includes such steps as proportionally mixing SiC particles with paraffin wax based multi-polymer adhesive, stirring, granulating, injection moulding, thermal defatting in solvent, presintering at 1000-1150 deg.C, and osmosizing the molten Al alloy into SiC skeleton at 1100-1200 deg.C in N2 atmosphere.
Description
Technical field
The invention belongs to the forming technique of metal-base composites parts, a kind of preparation high-volume fractional silicon-carbide particle reinforced aluminium-base (SiCp/Al) composite material parts method particularly is provided.Preparations low-cost, high-performance metal based composites parts have been realized.
Background technology
Particle enhanced aluminum-based composite material is maximum, the most widely used a kind of composite of research in the field of compound material.High-volume fractional (＞60vol%) the SiCp/Al composite has excellent physics and mechanical property because of it, as 2～3 times of specific strengths to titanium alloy, be better than the beryllium material high-dimensional stability, can become one of ideal electronic package material with the low linear expansion coefficient of steel and titanium alloy or even ceramic substrate coupling, the thermal conductivity suitable, far above the yield strength of aluminium alloy and the fracture toughness suitable etc. with Birmasil with beryllium material intensity and silicon carbide ceramics.Simultaneously in fields such as Aeronautics and Astronautics and national defence tempting application background is arranged as structural material, therefore, the research of this material in recent years is a big focus in investigation of materials field always.At present, prepare the ripe method of high-volume fractional SiCp/Al composite and mainly contain powder metallurgic method and SiCp preform-Al liquid infiltration method.Traditional powder metallurgic method adopts the simple powder-pressure shape-sintering three step process that mixes, and can select the type of matrix alloy composition and enhancing body neatly, but the scope of design of performance is bigger.But it only is about 55% that this method is produced SiCp/Al maximum volume mark, and production efficiency is low, the production cost height.And SiC preform-Al liquid infiltration method can be prepared the composite (can reach 75%) of high-volume fractional, this method at first is that a certain proportion of SiC micro mist and binder (as paraffin, water etc.) are prepared the SiC preform by powder metallurgy mold pressing technology, then binder is removed and carry out presintering and prepare SiC skeleton with certain porosity, by pressure the Al liquation is penetrated in the hole of SiC skeleton at last, thereby prepare high volume fraction SiC p/Al composite.Because this method adopts powder metallurgy mold pressing technology to prepare the SiC preform, so shaping base density unevenness is even, the complex-shaped degree of part also is very restricted.Particularly owing to not moistening between SiCp and the Al, even adopt various forms of pressurization infiltration technologies also to be difficult to reach infiltration fully, often stay a certain amount of pore, this is fatal weakness for electronic package material.In addition, high volume fraction SiC p/Al composite material machining is extremely difficult.Adopt powder injection forming-nothings pressure infiltration technique process combined not only can prepare even tissue, high-volume fractional SiCp/Al composite that density is high.Simultaneously, because power injection molding is a kind of near-net-shape technology, therefore also can directly prepare high-volume fractional SiCp/Al composite material parts, thereby thoroughly solved the shaping problem of high-volume fractional SiCp/Al composite material parts, realized the low-cost serialization production of high-volume fractional SiCp/Al composite material parts.
Summary of the invention
The object of the present invention is to provide a kind of preparation high-volume fractional silicon-carbide particle reinforced aluminium-base (SiCp/Al) composite material parts method, SiC particle-reinforced Al matrix is called for short SiCp/Al; Can be low-cost, directly prepare high-performance SiCp/Al composite material parts with net shape and higher dimensional precision.
The present invention adopts the powder injection forming technology to prepare the SiCp preform, improve the interface wet ability of SiC and Al liquation then by methods such as matrix alloyizatioies, make the Al liquation can be penetrated in the SiCp skeleton by the capillarity of hole, thereby obtain to have high volume fraction SiC p/Al composite material parts, promptly adopt powder injection forming-nothing to press the infiltration process preparation to have high volume fraction SiC p/Al composite material parts.Concrete technology is:
At first that selected SiC is mixing 1.5～2 hours in 110 ℃～130 ℃ on mixing roll according to certain ratio with the binding agent of being prepared, the powder useful load is 62～72 volume %, granulation back injection moulding on injection machine, obtain the SiC preform of required form, adopt vacuum degreasing then, remove binding agent and carry out the SiC skeleton that presintering obtains having certain porosity and intensity, the Al alloy (Al alloying component percentage by weight is Al: Si: Mg=85～92: 6～10: 2～5) that will account for part 28～38 volume % at last places SiC skeleton top to put into N together
2Do not have the pressure infiltration after being warming up to 1100～1200 ℃ in the infiltration stove as protective atmosphere, be incubated 1～4 hour, naturally cool to room temperature, be composite material parts.Technological process as shown in Figure 1.
The binding agent that the present invention prepared is heteropolymer constituent element paraffinic base (PW) binding agent, with high density polyethylene (HDPE) (HDPE), ethene-vinyl acetate resin copolymer (EVA) as plasticizer, with stearic acid (SA) is surfactant, and each constituent element percentage by weight is PW: HDPE: EVA: SA=(70～80): (10～15): (5～10): (0～5).
The feeding back moulding on injection machine of granulating, forming temperature is that 140～160 ℃, pressure are 100～120MPa on injection machine, pre-sintering temperature is 1000～1150 ℃.
The particle diameter of SiC raw material is 10～20 μ m.In order to improve the wetability between SiC and the Al, in Al, add the Si of (6～10) weight % and two kinds of alloying elements of Mg of (2～5) weight %, infiltration adopts N
2As protective atmosphere.
Adopt injection moulding-nothing to press the preparation of infiltration process combined to have the advantage that high volume fraction SiC p/Al composite material parts has been concentrated these two kinds of technologies, can realize the clean shaping of complicated shape part, the characteristics of follow-up machined difficulty have been overcome, its production equipment is simple, the production efficiency height, thereby can reduce production costs greatly.The more important thing is the volume fraction that adopts this technology can adjust SiC flexibly, the distribution of SiC particle in aluminum substrate is also very even, this mainly is because SiC shared volume fraction and SiC shared volume fraction in preform in composite material parts is identical, the ratio of binding agent is exactly the ratio of Al alloy substrate, therefore can accurately control the ratio of SiC and binding agent in mix stage.In the process of degreasing and presintering, by adjusting sintering temperature, left hole all is perforate after making binding agent be removed, can guarantee that like this Al alloy liquation fully is filled in the hole under the effect of capillary force, therefore prepared composite material parts density is very high, near solid density.
Description of drawings
Fig. 1 is a process chart of the present invention.
The specific embodiment
Embodiment 1: preparation SiC volume fraction is 62% SiCp/Al composite material parts
The average grain diameter of SiC is 10 μ m, and binding agent adopts heteropolymer constituent element paraffinic base binding agent, and its each constituent element percentage by weight is PW: HDPE: EVA: SA=79: 10: 6: 5.With this binding agent on the mixing roll in after under 130 ℃ of temperature mixing 1.5 hours with the SiC powder on the mixing roll under 110 ℃ of temperature mixing 2 hours, the powder useful load is 62 volume %, granulation back injection moulding on injector, injection temperature is 150 ℃, injection pressure is 105MPa.Gained SiC preform is at first dissolved degreasing in trichloro-ethylene, solution temperature is 40 ℃, and the SiC preform is warming up to 200 ℃ of insulations 1 hour in the vacuum degreasing stove subsequently, is warming up to 500 ℃ again and is incubated 2 hours to remove binding agent fully.SiC preform after the degreasing is continued to be warming up to 1000 ℃, and be incubated 2 hours and carry out presintering, obtain the SiC skeleton of porous.The Al alloy (Al alloying component percentage by weight is Al: Si: Mg=91: 6: 3) that will account for part 38 volume % at last places SiC skeleton top to put into N together
2Be warming up to 1100 ℃ and be incubated 4 hours in the infiltration stove as protective atmosphere, promptly get the SiCp/Al composite material parts.
Embodiment 2: preparation SiC volume fraction is 64% SiCp/Al composite material parts
The average grain diameter of SiC is 10 μ m, and binding agent adopts heteropolymer constituent element paraffinic base binding agent, and its each constituent element percentage by weight is PW: HDPE: EVA :=75: 15: 10.With this binding agent on the mixing roll in after under 130 ℃ of temperature mixing 1.5 hours with the SiC powder on the mixing roll under 110 ℃ of temperature mixing 2 hours, the powder useful load is 64 volume %, granulation back injection moulding on injector, injection temperature is 150 ℃, injection pressure is 110MPa.Gained SiC preform is at first dissolved degreasing in trichloro-ethylene, solution temperature is 40 ℃, and the SiC preform is warming up to 200 ℃ of insulations 1 hour in the vacuum degreasing stove subsequently, is warming up to 500 ℃ again and is incubated 2 hours to remove binding agent fully.SiC preform after the degreasing is continued to be warming up to 1150 ℃, and be incubated 2 hours and carry out presintering, obtain the SiC skeleton of porous.The Al alloy (Al alloying component percentage by weight is Al: Si: Mg=89: 7: 4) that will account for part 36 volume % at last places SiC skeleton top to put into N together
2Be warming up to 1200 ℃ and be incubated 2 hours in the infiltration stove as protective atmosphere, promptly get the SiCp/Al composite material parts.
Embodiment 3: preparation SiC volume fraction is 69% SiCp/Al composite material parts
The average grain diameter of SiC is 18 μ m, and binding agent adopts heteropolymer constituent element paraffinic base binding agent, and its each constituent element percentage by weight is PW: HDPE: EVA: SA=72: 15: 10: 3.With this binding agent on the mixing roll in after under 130 ℃ of temperature mixing 1.5 hours with the SiC powder on the mixing roll under 130 ℃ of temperature mixing 1.5 hours, the powder useful load is 69 volume %, granulation back injection moulding on injector, injection temperature is 160 ℃, injection pressure is 120MPa.Gained SiC preform is at first dissolved degreasing in trichloro-ethylene, solution temperature is 40 ℃, and the SiC preform is warming up to 200 ℃ of insulations 1 hour in the vacuum degreasing stove subsequently, is warming up to 500 ℃ again and is incubated 2 hours to remove binding agent fully.SiC preform after the degreasing is continued to be warming up to 1150 ℃, and be incubated 2 hours and carry out presintering, obtain the SiC skeleton of porous.The Al alloy (Al alloying component percentage by weight is Al: Si: Mg=86: 9: 5) that will account for part 31 volume % at last places SiC skeleton top to put into N together
2Be warming up to 1200 ℃ and be incubated 2 hours in the infiltration stove as protective atmosphere, promptly get the SiCp/Al composite material parts.
Claims (4)
1, a kind of preparation high-volume fractional silicon-carbide particle reinforced aluminium-base composite material member method, it is characterized in that: adopt the powder injection forming technology to prepare the SiCp preform, improve the interface wet ability of SiC and Al liquation then by methods such as matrix alloyizatioies, make the Al liquation can be penetrated in the SiCp skeleton by the capillarity of hole, thereby obtain to have high volume fraction SiC p/Al composite material parts, promptly adopt powder injection forming-nothing to press the infiltration process preparation to have high volume fraction SiC p/Al composite material parts.Concrete technology is: at first that selected SiC is mixing 1.5～2 hours in 110 ℃～130 ℃ on mixing roll according to certain ratio with the binding agent of being prepared, the powder useful load is 62～72 volume %, granulation back injection moulding on injection machine, obtain the SiC preform of required form, adopt vacuum degreasing then, remove binding agent and carry out the SiC skeleton that presintering obtains having certain porosity and intensity, to account for the Al alloy of part 28～38 volume % at last, Al alloying component percentage by weight is that Al: Si: Mg=85～92: 6～10: 2～5 place SiC skeleton top to put into N together
2Do not have the pressure infiltration after being warming up to 1100～1200 ℃ in the infiltration stove as protective atmosphere, be incubated 1～4 hour, naturally cool to room temperature.
2, in accordance with the method for claim 1, it is characterized in that: the binding agent of being prepared is a heteropolymer constituent element paraffinic base PW binding agent, with high density polyethylene, ethene-vinyl acetate resin copolymer EVA as plasticizer, with stearic acid SA is surfactant, and each constituent element percentage by weight is PW: HDPE: EVA: SA=70～80: 10～15: 5～10: 0～5;
3, according to claim 1 or 2 described methods, it is characterized in that: forming temperature is that 140～160 ℃, pressure are 100～120MPa on injection machine, and pre-sintering temperature is 1000～1150 ℃.
4, according to claim 1 or 2 described methods, it is characterized in that: the particle diameter of SiC raw material is 10～20 μ m, adds the Si of 6～10 weight % and two kinds of alloying elements of Mg of 2～5 weight % in Al.
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