A metal aluminum-based alumina-silicon carbide composite material and a preparation method thereof

Abstract

The present invention discloses a metal aluminum-based alumina-silicon carbide composite material and a preparation method thereof. The main components of the metal aluminum-based alumina-silicon carbide composite material include: alumina-silicon carbide-based porous ceramics and aluminum alloy. The volume percentage of alumina-silicon carbide-based porous ceramics to aluminum alloy is (50-70):(30-50), the volume fraction is greater than or equal to 99.5%, the density is less than 3.5 g / cm<supgt;3< / supgt;, the three-point bending strength is greater than 280 MPa, the thermal conductivity is greater than 75 W / m·K, and the thermal expansion coefficient is less than 7.5 ppm / K. Among them, the aluminum alloy is the ZL101 series; the porosity of the alumina-silicon carbide-based porous ceramics is 30%-50%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramics is 2-5 MPa. The present invention not only reduces the thermal resistance of the metal / ceramic interface, but also improves the supportability, stability and heat dissipation efficiency of the device, reduces the thermal deformation amount, and at the same time provides more and better choices for the field of medium-low thermal management heat dissipation materials in electronic packaging.

Description

Technical Field

[0001] The present invention relates to the technical field of new material preparation and encapsulation heat dissipation, and particularly relates to a metal aluminum-based alumina-silicon carbide composite material and a preparation method thereof. Background Art

[0002] Aluminum oxide ceramic clad copper plates can not only act as carrier plates to support devices, but also play a role in heat dissipation and insulation. At the same time, they can also achieve interlayer circuit interconnection and excellent electrical performance. They are widely used as the basic materials for mainstream high-power electronics, electronic circuit structure technology and interconnection technology. The common method is the direct copper plating method (DBC). However, during its application process, a chemical reaction occurs between the metal and the ceramic to form an interphase (CuAlO2 or CuAl2O4), increasing the interfacial thermal resistance and greatly reducing the thermal conductivity efficiency of the substrate; copper has a relatively high coefficient of linear expansion (17 - 20 ppm / K). During the operation of the device, the interfacial thermal stress increases, the interfacial adhesion is reduced, and the device is prone to falling off.

[0003] Compared with copper, metal aluminum has low cost, good plasticity, low density, low melting point and good interfacial wettability with alumina, and no transition layer will be generated at its interface. At the same time, the thermal conductivity coefficient of aluminum is 60% of that of copper, which can still meet the heat dissipation requirements of electronic packaging. However, its coefficient of linear expansion is relatively high (23 ppm / K), and large thermal stress will be generated at the interface, reducing the adhesion strength. Summary of the Invention

[0004] Aiming at the deficiencies of aluminum oxide ceramic clad copper plates, the present invention provides a metal aluminum-based alumina-silicon carbide composite material and a preparation method thereof. The present invention not only reduces the interfacial thermal resistance between the metal / ceramic, but also improves the supportability, stability and heat dissipation efficiency of the device, reduces the thermal deformation amount, and at the same time provides more and better choices for the field of medium-low heat management heat dissipation materials in electronic packaging.

[0005] The present invention adopts the following technical solutions:

[0006] A preparation method of a metal aluminum-based alumina-silicon carbide composite material, including the following processes:

[0007] Mix silicon carbide particles, alumina particles and borosilicate fine powder to obtain material V1;

[0008] Mix material V1 and polyvinyl alcohol to obtain material V2;

[0009] Bake material V2 to obtain material V3;

[0010] Crush material V3 to obtain material V4;

[0011] Sieve material V4 to obtain the sifted material V5 with a preset particle size;

[0012] Press the material V5 into a shape to obtain a ceramic blank D1;

[0013] Sinter the ceramic blank D1 to obtain a porous ceramic blank D2;

[0014] Impregnate the porous ceramic blank D2 with aluminum to obtain a metal aluminum matrix alumina-silicon carbide composite blank D3, and the metal aluminum matrix alumina-silicon carbide composite blank D3 is the said metal aluminum matrix alumina-silicon carbide composite.

[0015] Preferably, the mass ratio of silicon carbide particles, alumina particles and borosilicate fine powder is (65-85):(15-35):(0.5-1);

[0016] Among them, the particle size of the alumina particles is 70μm < D 50 < 85μm, the particle size of the silicon carbide particles is 50μm < D 50 < 75μm, the particle size of the borosilicate fine powder is 0.5μm < D 50 < 1μm;

[0017] The raw material of the said alumina particles is a mixed powder of brown fused alumina and mullite, and the composition of the said alumina particles meets the following conditions: w (Al2O3)≥95%, w (TiO2)≤5%;

[0018] The composition of the silicon carbide particles meets the following conditions: w (SiC)≥99.5%;

[0019] The composition of the borosilicate fine powder meets the following conditions: 25%≤ w (B2O3)≤30%, 70%≤ w (SiO2)≤75%;

[0020] When mixing the silicon carbide particles, alumina particles and borosilicate fine powder, a V-type mixer is used as the mixing equipment, and the rotation speed during mixing is: 150-300r / min, and the mixing time is 2h-4h.

[0021] Preferably, the mass ratio of the material V1 and polyvinyl alcohol is 100:(5~10); the mixing equipment of the material V1 and polyvinyl alcohol uses a high-speed counter-rotating mixer, and the rotation speed during mixing is: 3000-3500r / min, and the mixing time is 3min-5min.

[0022] Preferably, when baking the material V2, the baking temperature is 85℃-95℃ and the time is 8min-15min.

[0023] Preferably, when the material V3 is pulverized, a high-speed counter-rotating pulverizer is used, and the rotation speed during pulverization is 2000 - 2500 r / min, and the time is 1 - 2 min.

[0024] Preferably, when the material V4 is sieved, a vibrating screen is used, and the screen hole size of the vibrating screen is 0.21 mm - 0.26 mm.

[0025] Preferably, when the material V5 is pressed into shape, the molding pressure is 3 - 8 MPa and the pressure holding time is 5 - 10 s.

[0026] Preferably, when the ceramic blank D1 is sintered, the sintering temperature is 1000 - 1150 °C and the sintering time is 25 - 40 min;

[0027] The specific process of heating during sintering includes:

[0028] Heating from 50 °C to 200 °C takes 1 - 1.5 h; holding at 200 °C for 1 - 2 h; heating from 200 °C to 450 °C takes 1 - 1.5 h; holding at 450 °C for 1 - 2 h; heating from 450 °C to 650 °C takes 2 - 3 h; holding at 650 °C for 1 - 2.5 h; heating from 650 °C to the target temperature takes 0.5 - 1 h.

[0029] Preferably, when the porous ceramic blank D2 is infiltrated with aluminum, the porous ceramic blank D2 is infiltrated with aluminum in a resistance furnace vacuum pressure infiltration furnace, the infiltration pressure is 2 - 5 MPa, and the infiltration time is 1 - 2 h.

[0030] The present invention also provides a metal aluminum-based alumina-silicon carbide composite material, which is prepared by the preparation method as described above in the present invention. The composition of the metal aluminum-based alumina-silicon carbide composite material includes an alumina-silicon carbide-based porous ceramic and an aluminum alloy, wherein: the volume percentage of the alumina-silicon carbide-based porous ceramic to the aluminum alloy is (50 - 70):(30 - 50);

[0031] The volume fraction of the metal aluminum-based alumina-silicon carbide composite material is greater than or equal to 99.5%, the density is less than 3.5 g / cm 3 ³, the three-point bending strength is greater than 280 MPa, the thermal conductivity is greater than 75 W / m·K, and the thermal expansion coefficient is less than 7.5 ppm / K;

[0032] The aluminum alloy adopts the ZL101 series; the porosity of the alumina-silicon carbide-based porous ceramic is 30% - 50%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramic is 2 - 5 MPa.

[0033] Compared with the prior art, the present invention has the following beneficial effects:

[0034] Based on the principle of collaborative optimization, the present invention combines the excellent properties of low thermal expansion coefficient (3.8 ppm / K), fast heat conduction (40 W / m·K), good electrical insulation and wear resistance of silicon carbide. Through the pyrolysis reaction of polyvinyl alcohol and the high-temperature reaction sintering of borosilicate fine powder, a silica-boron oxide point bonding phase is formed between silicon carbide and alumina particles, obtaining an alumina-silicon carbide composite ceramic that can meet the requirements of vacuum pressure infiltration. There is no transition layer between the infiltrated aluminum (such as ZL101 aluminum alloy) and alumina, and the heterogeneous interface resistance is low. Moreover, the external air pressure difference during the infiltration process provides the driving force for the filling of molten aluminum, and the molten aluminum can fully fill the voids in the alumina-silicon carbide composite ceramic, forming a metal aluminum-based alumina-silicon carbide composite material ( Figure 1 ), providing more and better choices for the field of medium-low thermal management heat dissipation materials in electronic packaging. Brief Description of the Drawings

[0035] Figure 1 It is the metallographic diagram of the metal aluminum-based alumina-silicon carbide composite material prepared in Example 1 of the present invention. Detailed Embodiments

[0036] The technical solutions of the present invention will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0037] The preparation method of the metal aluminum-based alumina-silicon carbide composite material of the present invention includes the following steps:

[0038] S1. Perform the first proportioning and kneading on silicon carbide particles, alumina particles and borosilicate fine powder. Among them, the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder is (65 - 85):(15 - 35):(0.5 - 1), and the particle size of alumina particles is 70 μm < D 50 < 85 μm, the particle size of silicon carbide particles is 50 μm < D 50 < 75 μm, and the particle size of borosilicate fine powder is 0.5 μm < D 50 < 1 μm. The raw material of alumina particles is a mixed powder of brown fused alumina and mullite, and its composition meets the following conditions: w (Al2O3) ≥ 95%, w (TiO2) ≤ 5%; the composition of silicon carbide particles meets the following conditions: w (SiC) ≥ 99.5%; the composition of borosilicate fine powder meets the following conditions: 25% ≤ w (B2O3) ≤ 30%, 70% ≤ w(SiO2) ≤ 75%; The mixing equipment is a V-type mixer. During mixing, the rotation speed of the V-type mixer is 150 - 300 r / min, and the mixing time is 2 h - 4 h to obtain material V1;

[0039] S2. Take the material V1 obtained in step S1 and polyvinyl alcohol (PVA) for the second ratio and mixing to obtain material V2. Among them, the mass ratio of material V1 to polyvinyl alcohol (PVA) is 100:(5 - 10); The mixing equipment is a high-speed counter-rotating mixer. During mixing, the rotation speed of the high-speed counter-rotating mixer is 3000 - 3500 r / min, and the mixing time is 3 min - 5 min;

[0040] S3. Place the material V2 obtained in step S2 in an oven for baking treatment to obtain material V3. Among them, the oven temperature is 85°C - 95°C, and the baking time is 8 min - 15 min;

[0041] S4. Crush the material V3 obtained in step S3 in a high-speed counter-rotating crusher to obtain material V4. During the crushing process, the rotation speed of the high-speed counter-rotating crusher is 2000 - 2500 r / min, and the time is 1 - 2 min;

[0042] S5. Place the material V4 obtained in step S4 on a vibrating screen with a certain sieve hole size to obtain the undersize material V5. Among them, the sieve hole size of the vibrating screen is 0.21 mm - 0.26 mm;

[0043] S6. Under a pressure of 3 - 8 MPa, weigh an appropriate mass of the material V5 in step S5 and place it in a mold. The pressure holding time is 5 - 10 s, and it is pressed and formed to obtain a ceramic blank D1;

[0044] S7. Place the ceramic blank D1 obtained in step S6 in a resistance furnace, heat it up to the target temperature in a programmed manner for sintering to obtain a porous ceramic blank D2; Among them, the target temperature (i.e., the sintering temperature) is 1000 - 1150°C, and the PID heating program is: heat up from 50°C to 200°C, taking 1 - 1.5 h; keep it at 200°C for 1 - 2 h; heat up from 200°C to 450°C, taking 1 - 1.5 h; keep it at 450°C for 1 - 2 h; heat up from 450°C to 650°C, taking 2 - 3 h; keep it at 650°C for 1 - 2.5 h; heat up from 650°C to the target temperature, taking 0.5 - 1 h, and the holding and sintering time at the target temperature is 25 - 40 min;

[0045] S8. Place the ceramic blank D2 obtained in step S7 in a resistance furnace vacuum pressure impregnation furnace, program it to the target parameters (i.e., the impregnation pressure is 2 - 5 MPa, and the impregnation time is 1 - 2 h) to obtain a metal aluminum matrix alumina - silicon carbide composite blank D3.

[0046] According to requirements, the metal aluminum-based alumina-silicon carbide composite material blank D3 prepared by the above preparation method of the present invention can be processed through processes such as grinding, machining, and surface coating with insulating glue to obtain a metal aluminum-based alumina-silicon carbide composite material product D4.

[0047] The metal aluminum-based alumina-silicon carbide composite material prepared by the above preparation method of the present invention mainly includes alumina-silicon carbide-based porous ceramics and aluminum alloy, and its physical and chemical parameters meet the following: for alumina-silicon carbide-based porous ceramics: aluminum alloy, the volume percentage is (50-70):(30-50), the volume fraction is greater than or equal to 99.5%, and the density is less than 3.5 g / cm 3 , the three-point bending strength is greater than 280 MPa, the thermal conductivity is greater than 75 W / m·K, and the thermal expansion coefficient is less than 7.5 ppm / K. Among them, the aluminum alloy is the ZL101 series; the porosity of the alumina-silicon carbide-based porous ceramics is 30%-50%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramics is 2-5 MPa.

[0048] The data of density (porosity), pore size distribution, three-point bending strength, thermal conductivity, and thermal expansion coefficient involved in the present invention are obtained according to "Test Method for Apparent Porosity and Bulk Density of Ceramic Bodies (QB / T 1642-2012)", "Test Method for Pore Channel Diameter of Porous Ceramics (GB / T 1967-1996)", "Stress-Strain Experimental Method (GB / T 38978-2020)", "Measurement of Thermal Diffusivity or Thermal Conductivity by the Flash Method (GBT 22588-2008)", and "Test Method for Linear Thermal Expansion Coefficient of Solid Materials (GJB332A-2004)".

[0049] Example 1

[0050] In this example, the following raw materials are used. The mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder is 65:35:0.5. The particle size of the alumina particles is D50 = 70 μm, the particle size of the silicon carbide particles is D50 = 50 μm, and the particle size of the borosilicate fine powder is D50 = 0.5 μm. The raw material of the alumina particles is a mixed powder of brown fused alumina-mullite, and its composition meets: w(Al2O3)=98%, w(TiO2)=2%; the composition of the silicon carbide particles meets: w(SiC)=99.6%; the composition of the borosilicate fine powder meets: w(B2O3)=25%, w(SiO2)=75%.

[0051] The specific preparation steps of the metal aluminum-based alumina-silicon carbide composite material in this example are as follows:

[0052] S1. First, mix silicon carbide particles, alumina particles, and borosilicate fine powder according to the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder = 65:35:0.5 at a rotation speed of 150 r / min for 2 h to obtain material V1;

[0053] S2. Then, take the material V1 obtained in step S1 and polyvinyl alcohol (PVA) and mix them according to the mass ratio of 100:10. The rotation speed of the high-speed counter-rotating mixer is 3000 r / min, and the mixing time is 3 min to obtain material V2;

[0054] S3. Place the material V2 obtained in step S2 in an oven at a temperature of 95 °C for 15 min. After baking treatment, obtain material V3;

[0055] S4. Put the material V3 obtained in step S3 into a high-speed counter-rotating crusher at a rotation speed of 2000 r / min for 1 min. After crushing treatment, obtain material V4;

[0056] S5. Place the material V4 obtained in step S4 in a vibrating screen with a screen diameter of 400 mm and a screen hole diameter of 0.26 mm at a frequency of 50 Hz for 5 min to obtain the undersize material V5;

[0057] S6. Weigh 10 g of the material V5 obtained in step S5, place it in a mold, apply a pressure of 3 MPa, and keep the pressure for 5 s to press and form a ceramic blank D1;

[0058] S7. Place the ceramic blank D1 obtained in step S6 in a resistance furnace and raise the temperature to the target temperature by a programmed heating to obtain a porous ceramic blank D2. The specific PID heating program is as follows:

[0059] The time taken to raise the temperature from 50 °C to 200 °C is 1 h;

[0060] The holding time at 200 °C is 1 h;

[0061] The time taken to raise the temperature from 200 °C to 450 °C is 1 h;

[0062] The holding time at 450 °C is 1 h;

[0063] The time taken to raise the temperature from 450 °C to 650 °C is 2 h;

[0064] The holding time at 650 °C is 1 h;

[0065] The time taken to raise the temperature from 650 °C to 1000 °C is 0.5 h;

[0066] The holding time at 1000 °C is 25 min.

[0067] S8. Place the ceramic blank D2 obtained in step S7 into a resistance furnace vacuum pressure impregnation furnace, with an impregnation pressure of 2 MPa and an impregnation time of 1 h to obtain a metal aluminum matrix alumina-silicon carbide composite blank D3;

[0068] S9. Subject the metal aluminum matrix alumina-silicon carbide composite blank D3 obtained in step S8 to processes such as grinding, machining, and surface coating with insulating glue to obtain a metal aluminum matrix alumina-silicon carbide composite product D4.

[0069] The metal aluminum matrix alumina-silicon carbide composite prepared in this embodiment includes an alumina-silicon carbide based porous ceramic and an aluminum alloy, and its physical and chemical parameters meet the following: for the alumina-silicon carbide based porous ceramic: the volume percentage of the aluminum alloy is 50:50, the volume fraction is 99.6%, and the density is 3.35 g / cm 3 , the three-point bending strength is 250 MPa, the thermal conductivity is 75 W / m·K, and the thermal expansion coefficient is 10 ppm / K. Among them, the aluminum alloy is ZL101A; the porosity of the alumina-silicon carbide based porous ceramic is 50%, and the three-point bending strength of the alumina-silicon carbide based porous ceramic is 3.18 MPa.

[0070] Example 2

[0071] This embodiment uses the following raw materials, with the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder being 85:15:1. The particle size of the alumina particles is D50 = 85 μm, the particle size of the silicon carbide particles is D50 = 75 μm, and the particle size of the borosilicate fine powder is D50 = 1 μm. The raw material of the alumina particles is a mixed powder of brown fused alumina-mullite, and its composition meets: w(Al2O3)=95%, w(TiO2)=5%; the composition of the silicon carbide particles meets: w(SiC)=99.6%; the composition of the borosilicate fine powder meets: w(B2O3)=30%, w(SiO2)=70%.

[0072] The specific preparation steps of the metal aluminum matrix alumina-silicon carbide composite in this embodiment are as follows:

[0073] S1. First, proportion the silicon carbide particles, alumina particles, and borosilicate fine powder according to the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder = 70:30:1, with a rotation speed of 300 r / min and a mixing time of 4 h to obtain a material V1;

[0074] S2. Take the material V1 obtained in step S1 and polyvinyl alcohol (PVA) and conduct a second proportioning according to the mass ratio of 100:5. The rotation speed of the high-speed counter-rotating mixer is: 3500 r / min, and the mixing time is 5 min to obtain a material V2;

[0075] S3. Place the material V2 obtained in step S2 in an oven at a temperature of 85°C for 8 minutes of kneading. After baking, material V3 is obtained.

[0076] S4. Place the material V3 obtained in step S3 into a high-speed counter-rotating crusher at a speed of 2500 r / min for 2 minutes. After crushing, material V4 is obtained.

[0077] S5. Place the material V4 obtained in step S4 in a vibrating screen with a screen diameter of 400 mm and a screen hole diameter of 0.21 mm at a frequency of 50 Hz for 5 minutes to obtain the undersize material V5.

[0078] S6. Weigh 10 g of the material V5 obtained in step S5, place it in a mold, apply a pressure of 8 MPa, and hold the pressure for 10 s to form a ceramic blank D1 by pressing.

[0079] S7. Place the ceramic blank D1 obtained in step S6 in a resistance furnace and raise the temperature to the target temperature by a programmed heating process to obtain a porous ceramic blank D2. The specific PID heating program is as follows:

[0080] The time taken to raise the temperature from 50°C to 200°C is 1.5 h.

[0081] The holding time at 200°C is 2 h.

[0082] The time taken to raise the temperature from 200°C to 450°C is 1.5 h.

[0083] The holding time at 450°C is 2 h.

[0084] The time taken to raise the temperature from 450°C to 650°C is 3 h.

[0085] The holding time at 650°C is 2.5 h.

[0086] The time taken to raise the temperature from 650°C to 1150°C is 1 h.

[0087] The holding time at 1150°C is 40 min.

[0088] S8. Place the ceramic blank D2 obtained in step S7 in a resistance furnace vacuum pressure impregnation furnace at an impregnation pressure of 5 MPa for 2 h to obtain a metal aluminum matrix alumina-silicon carbide composite blank D3.

[0089] S9. Subject the metal aluminum matrix alumina-silicon carbide composite blank D3 obtained in step S8 to processes such as grinding, machining, and surface coating with insulating glue to obtain a metal aluminum matrix alumina-silicon carbide composite product D4.

[0090] The metal aluminum-based alumina-silicon carbide composite material prepared in this example includes alumina-silicon carbide-based porous ceramics and aluminum alloy, and its physical and chemical parameters meet the following: for the alumina-silicon carbide-based porous ceramics: the volume percentage of aluminum alloy is 70:30, the volume fraction is 99.8%, and the density is 3.2 g / cm 3 , the three-point bending strength is 290 MPa, the thermal conductivity is 85 W / m·K, and the thermal expansion coefficient is 7 ppm / K. Among them, the aluminum alloy is ZL101A; the porosity of the alumina-silicon carbide-based porous ceramics is 30%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramics is 3.5 MPa.

[0091] Example 3

[0092] This example uses the following raw materials, and the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder is 75:25:0.7. The particle size of the alumina particles is D50 = 80 μm, the particle size of the silicon carbide particles is D50 = 65 μm, and the particle size of the borosilicate fine powder is D50 = 0.7 μm. The raw material of the alumina particles is a mixed powder of brown fused alumina-mullite, and its composition meets: w(Al2O3)=97%, w(TiO2)=3%; the composition of the silicon carbide particles meets: w(SiC)=99.6%; the composition of the borosilicate fine powder meets: w(B2O3)=27%, w(SiO2)=73%.

[0093] The specific preparation steps of the metal aluminum-based alumina-silicon carbide composite material in this example are as follows:

[0094] S1. First, mix silicon carbide particles, alumina particles, and borosilicate fine powder according to the mass ratio of alumina particles: silicon carbide particles: borosilicate fine powder = 65:35:0.7, with a rotation speed of 250 r / min and a mixing time of 3 h to obtain material V1;

[0095] S2. Take the material V1 obtained in step S1 and polyvinyl alcohol (PVA) and conduct a second mixing according to the mass ratio of 100:7. The rotation speed of the high-speed counter-rotating mixer is: 3200 r / min, and the mixing time is 4 min to obtain material V2;

[0096] S3. Place the material V2 obtained in step S2 in an oven at a temperature of 90 °C and a mixing time of 10 min. After baking treatment, obtain material V3;

[0097] S4. Put the material V3 obtained in step S3 into a high-speed counter-rotating crusher, with a rotation speed of: 2300 r / min and a time of 1.5 min. After crushing treatment, obtain material V4;

[0098] S5. Place the material V4 obtained in step S4 into a vibrating screen with a screen diameter of 400 mm and a screen hole diameter of 0.23 mm, at a frequency of 50 Hz for 5 minutes to obtain the undersize material V5;

[0099] S6. Weigh 10 g of the material V5 obtained in step S5, place it in a mold, apply a pressure of 6 MPa, and hold the pressure for 8 s to press and form a ceramic blank D1;

[0100] S7. Place the ceramic blank D1 obtained in step S6 into an electric resistance furnace and increase the temperature programmatically to the target temperature to obtain a porous ceramic blank D2. The specific PID temperature increase program is as follows:

[0101] The time taken to increase the temperature from 50 °C to 200 °C is 75 min;

[0102] The holding time at 200 °C is 1.5 h;

[0103] The time taken to increase the temperature from 200 °C to 450 °C is 70 min;

[0104] The holding time at 450 °C is 80 min;

[0105] The time taken to increase the temperature from 450 °C to 650 °C is 2.5 h;

[0106] The holding time at 650 °C is 1.5 h;

[0107] The time taken to increase the temperature from 650 °C to 1150 °C is 45 min;

[0108] The holding time at 1050 °C is 25 min.

[0109] S8. Place the ceramic blank D2 obtained in step S7 into an electric resistance furnace vacuum pressure impregnation furnace, with an impregnation pressure of 4 MPa and an impregnation time of 90 min to obtain a metal aluminum matrix alumina-silicon carbide composite blank D3;

[0110] S9. Subject the metal aluminum matrix alumina-silicon carbide composite blank D3 obtained in step S8 to processes such as grinding, machining, and surface coating with insulating glue to obtain a metal aluminum matrix alumina-silicon carbide composite product D4. The metal aluminum matrix alumina-silicon carbide composite prepared in this example includes alumina-silicon carbide based porous ceramics and aluminum alloy, and the physical and chemical parameters meet the requirements: for the alumina-silicon carbide based porous ceramics: the volume percentage of aluminum alloy is 65:35, the volume fraction is 99.7%, and the density is 3.25 g / cm 3, the three-point bending strength is 270 MPa, the thermal conductivity is 80 W / m·K, and the thermal expansion coefficient is 8 ppm / K. Among them, the aluminum alloy is ZL101A; the porosity of the alumina-silicon carbide-based porous ceramic is 35%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramic is 3.3 MPa.

[0111] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A preparation method of a metal aluminum-based alumina-silicon carbide composite material, characterized in that, It includes the following processes: Mix silicon carbide particles, alumina particles and borosilicate fine powder to obtain material V1; Mix material V1 and polyvinyl alcohol to obtain material V2; Bake material V2 to obtain material V3; Crush material V3 to obtain material V4; Sieve material V4 to obtain the undersize material V5 with a preset particle size; Press material V5 into a shape to obtain ceramic blank D1; Sinter the ceramic blank D1 to obtain a porous ceramic blank D2; Impregnate the porous ceramic blank D2 with aluminum to obtain a metal aluminum matrix alumina-silicon carbide composite blank D3, and the metal aluminum matrix alumina-silicon carbide composite blank D3 is the said metal aluminum matrix alumina-silicon carbide composite material; The mass ratio of the silicon carbide particles, alumina particles and borosilicate fine powder is (65-85):(15-35):(0.5-1); Among them, the particle size of the alumina particles is 70 μm < D 50 < 85 μm, the particle size of the silicon carbide particles is 50 μm < D 50 < 75 μm, the particle size of the borosilicate fine powder is 0.5 μm < D 50 < 1 μm; The raw material of the alumina particles is a mixed powder of brown fused alumina and mullite, and the composition of the alumina particles satisfies the following conditions: w (Al2O3) ≥ 95%, w (TiO2) ≤ 5%; The composition of the silicon carbide particles satisfies the following conditions: w (SiC) ≥ 99.5%; The composition of the boron-silicon fine powder meets the following conditions: 25% ≤ w (B2O3) ≤ 30%, 70% ≤ w (SiO2) ≤ 75%; When mixing the silicon carbide particles, alumina particles and borosilicate fine powder, a V-type mixer is used as the mixing equipment, and the rotation speed during mixing is: 150-300 r / min, and the mixing time is 2 h-4 h; The mass ratio of material V1 and polyvinyl alcohol is 100:(5-10); a high-speed counter-rotating mixer is used as the mixing equipment for material V1 and polyvinyl alcohol, and the rotation speed during mixing is: 3000-3500 r / min, and the mixing time is 3 min-5 min; When sintering the ceramic blank D1, the sintering temperature is 1000-1150 °C, and the sintering time is 25-40 min; The specific process of heating during sintering includes: Heat from 50 °C to 200 °C, taking 1-1.5 h; keep warm at 200 °C for 1-2 h; heat from 200 °C to 450 °C, taking 1-1.5 h; keep warm at 450 °C for 1-2 h; heat from 450 °C to 650 °C, taking 2-3 h; keep warm at 650 °C for 1-2.5 h; heat from 650 °C to the target temperature, taking 0.5-1 h.

2. The preparation method of a metal aluminum-based alumina-silicon carbide composite material according to claim 1, characterized in that When baking material V2, the baking temperature is 85 °C-95 °C and the time is 8 min-15 min.

3. The preparation method of a metal aluminum-based alumina-silicon carbide composite material according to claim 1, wherein, When crushing material V3, a high-speed counter-rotating crusher is used as the crushing equipment, and the rotation speed during crushing is: 2000-2500 r / min and the time is 1-2 min.

4. The preparation method of a metal aluminum-based alumina-silicon carbide composite material according to claim 1, characterized in that, When sieving material V4, a vibrating screen is used, and the screen hole size of the vibrating screen is 0.21 mm-0.26 mm.

5. The preparation method of a metal aluminum-based alumina-silicon carbide composite material according to claim 1, wherein, When pressing material V5 into a shape, the forming pressure is 3-8 MPa and the pressure holding time is 5-10 s.

6. The preparation method of a metal aluminum-based alumina-silicon carbide composite material according to claim 1, characterized in that, When impregnating the porous ceramic blank D2 with aluminum, immerse the porous ceramic blank D2 in a resistance furnace vacuum pressure impregnation furnace to impregnate with aluminum, the impregnation pressure is 2-5 MPa, and the impregnation time is 1-2 h.

7. A metal aluminum-based alumina-silicon carbide composite material, characterized in that, The said metal aluminum matrix alumina-silicon carbide composite material is prepared by the preparation method described in any one of claims 1-6. The composition of the said metal aluminum matrix alumina-silicon carbide composite material includes alumina-silicon carbide-based porous ceramics and aluminum alloy, wherein: the volume percentage of the alumina-silicon carbide-based porous ceramics to the aluminum alloy is (50-70):(30-50); The volume fraction of the aluminum-based alumina-silicon carbide composite material is greater than or equal to 99.5%, the density is less than 3.5 g / cm 3 , the three-point bending strength is greater than 280 MPa, the thermal conductivity is greater than 75 W / m·K, and the coefficient of thermal expansion is less than 7.5 ppm / K; The aluminum alloy used is the ZL101 series; the porosity of the alumina-silicon carbide-based porous ceramic is 30% to 50%, and the three-point bending strength of the alumina-silicon carbide-based porous ceramic is 2 - 5 MPa.

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