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CN-122028780-A - Composite material packaging shell with efficient directional thermal management function and manufacturing method thereof

CN122028780ACN 122028780 ACN122028780 ACN 122028780ACN-122028780-A

Abstract

The invention discloses a composite material packaging shell with high-efficiency directional thermal management function and a manufacturing method thereof, belonging to the packaging technical field, which is divided into a high-power high-temperature resistant area and a low-power non-high-temperature resistant area according to the thermal performance of a module, wherein the shell comprises a titanium alloy surrounding frame and a partition wall, the partition wall comprises a continuous partition wall and a hollowed partition wall, the continuous partition wall isolates a high-power high-temperature resistant area from a low-power non-high-temperature resistant area, the hollow partition wall is arranged at other positions to serve as structural reinforcement, diamond powder and metal powder are filled in the surrounding frame and the bottom plate during preparation, the diamond metal composite material is sintered into a diamond metal composite material, the demolded shell is machined to remove the titanium alloy bottom plate, and the machining surface is the installation radiating surface of the module. The technology of the invention can eliminate local hot spots and simultaneously inhibit the problem of thermal crosstalk between devices.

Inventors

  • ZHANG YUSHENG
  • WEI TAO
  • ZHAO JIANFA
  • QIAN JIYU

Assignees

  • 中国电子科技集团公司第十四研究所

Dates

Publication Date
20260512
Application Date
20260210

Claims (8)

  1. 1. The utility model provides a composite material encapsulation casing that possesses high-efficient directional thermal management function, is divided into high-power high temperature resistant region and low-power not high temperature resistant region according to the thermal behavior of module, its characterized in that, the casing includes the enclose frame and the partition wall of titanium alloy, and the partition wall includes continuous partition wall and fretwork partition wall, continuous partition wall keeps apart high-power high temperature resistant region and low-power not high temperature resistant region, and other positions set up the fretwork partition wall as structural reinforcement, enclose the frame intussuseption and pack diamond powder and metal powder to sinter into diamond metal composite.
  2. 2. The composite material packaging shell with the efficient directional thermal management function according to claim 1, wherein the hollowed partition walls are arranged at intervals of 30-50 mm.
  3. 3. The composite packaging shell with efficient directional thermal management as recited in claim 1, wherein the metal powder is selected from the group consisting of aluminum powder, copper powder, and combinations thereof.
  4. 4. The composite material packaging shell with the efficient directional thermal management function according to claim 1, wherein the diamond powder has a particle size of 25-300 μm.
  5. 5. The composite material packaging shell with the efficient directional thermal management function according to claim 1 or 4, wherein the surface of the diamond powder is coated with a titanium film, and the thickness is 40-200 nm.
  6. 6. The composite material packaging shell with the efficient directional thermal management function according to claim 1 or 3, wherein the particle size of the metal powder is 10-40 μm.
  7. 7. The composite packaging shell with the efficient directional thermal management function according to claim 1 or 3, wherein the surface of the metal powder is subjected to an anti-oxidation treatment.
  8. 8. The manufacturing method of the composite material packaging shell with the efficient directional thermal management function is characterized by comprising the following steps of: (1) According to the module size and the device type number, the device distribution is optimally designed according to the function requirement and is divided into a high-power high-temperature-resistant area and a low-power low-temperature-intolerant area, wherein a titanium alloy continuous partition wall is arranged between the two areas, and titanium alloy hollowed partition walls are arranged at other positions with intervals of 30-50 mm; (2) Processing a titanium alloy framework, wherein the framework comprises a bottom plate, a surrounding frame and a partition wall, and preparing a shell mold according to the structural size of the shell and the size of the titanium alloy framework; (3) Preparing diamond powder and metal powder; (4) Placing a titanium alloy framework in a shell mould, and filling the titanium alloy framework with fully mixed diamond powder and metal powder; (5) Sintering in a furnace, wherein the sintering temperature is 700-1400 ℃, the heat preservation time is 30-150 min, and the loading pressure is 5-15 MPa; (6) Cooling to room temperature, demolding the molded shell, machining to remove the titanium alloy bottom plate, and obtaining the machined surface, namely the mounting radiating surface of the module.

Description

Composite material packaging shell with efficient directional thermal management function and manufacturing method thereof Technical Field The invention relates to the technical field of packaging, in particular to a composite material packaging shell with an efficient directional thermal management function and a manufacturing method thereof. Background With the rapid development of the electronic and communication industries, the radio frequency microwave devices are developing to high power and high integration, and the heat dissipation problem of the radio frequency microwave devices is also becoming more and more prominent. If the accumulated heat cannot be conducted or dissipated in time, performance degradation caused by overtemperature of the device and even damage failure of the device can be caused. The improvement of heat consumption and heat flux density of the radio frequency microwave device brings new requirements to the heat conductivity of the packaging shell. Along with the upgrading of a semiconductor material system, the third-generation semiconductor material GaN is increasingly used for replacing the second-generation semiconductor material GaAs in the radio frequency device, the maximum withstand temperature of the GaN device can reach more than 200 ℃, and the high temperature resistance is good. However, devices such as capacitors, silicon chips and the like resistant to temperature differences still exist in the radio frequency module, and the highest resistant shell temperature is usually 85-100 ℃. The GaN power amplifier device has large heating value, strong temperature resistance, low heating value of devices such as a capacitor and weak temperature resistance, and the outstanding difficulty of the thermal design at the present stage is realized by inhibiting thermal crosstalk and realizing thermal isolation design while eliminating local hot spots. Disclosure of Invention The invention provides a composite material packaging shell with an efficient directional thermal management function and a manufacturing method thereof, aiming at solving the defects in the prior art. The packaging shell is formed by compounding diamond particles and metal, the heat conductivity coefficient is high, the expansion coefficient is low, the chip can be packaged by welding and cementing, and the effect of eliminating local hot spots is achieved by utilizing enhanced heat transfer. The preparation method of the metal framework and the partition sintering molding is added, the size limitation of the conventional diamond composite shell is broken through, and the preparation of the large-size diamond composite shell and the heat insulation and heat conduction design in the partition are realized. The utility model provides a composite material encapsulation casing that possesses high-efficient directional thermal management function, is divided into high-power high temperature resistant region and low-power not high temperature resistant region according to the thermal behavior of module, the casing includes the frame and the partition wall of enclosing of titanium alloy, and the partition wall includes continuous partition wall and fretwork partition wall, continuous partition wall keeps apart high-power high temperature resistant region and low-power not high temperature resistant region, and other positions set up the fretwork partition wall as structural reinforcement, enclose frame intussuseption and fill diamond powder and metal powder to sinter into diamond metal composite. Further, the hollow partition walls are arranged at intervals of 30-50 mm. Further, the metal powder is selected from aluminum powder, copper powder, and combinations thereof. Further, the diamond powder has a particle size of 25-300 μm. Further, the surface of the diamond powder is coated with a titanium film, and the thickness is 40-200 nm. Further, the particle size of the metal powder is 10-40 mu m. Further, the surface of the metal powder is subjected to oxidation prevention treatment. A manufacturing method of a composite material packaging shell with an efficient directional thermal management function comprises the following steps: (1) According to the module size and the device type number, the device distribution is optimally designed according to the function requirement and is divided into a high-power high-temperature-resistant area and a low-power low-temperature-intolerant area, wherein a titanium alloy continuous partition wall is arranged between the two areas, and titanium alloy hollowed partition walls are arranged at other positions with intervals of 30-50 mm; (2) Processing a titanium alloy framework, wherein the framework comprises a bottom plate, a surrounding frame and a partition wall, and preparing a shell mold according to the structural size of the shell and the size of the titanium alloy framework; (3) Preparing diamond powder and metal powder; (4) Placing a titanium alloy framework in a shell m