Composite aluminum nitride heat-conducting gasket
By using composite aluminum nitride thermal pads, the problems of decreased mechanical strength and insufficient thermal conductivity of silicone pads at high temperatures are solved. By adopting a thermally conductive skeleton and a silicone-free structure, the thermal conductivity optimization of maintaining mechanical strength and low thermal resistance at high temperatures is achieved.
Patent Information
- Application Number
- CN202422965675.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-02
- Publication Date
- 2025-12-26
- Estimated Expiration
- 2034-12-02
AI Technical Summary
Existing thermal pad materials, such as silicone pads, soften, creep, and relax under high temperatures, resulting in decreased mechanical strength and insufficient thermal conductivity, thus failing to effectively reduce thermal resistance.
The composite aluminum nitride thermal pad consists of a substrate, a thermally conductive skeleton, a thermally conductive coating, and a release layer. It utilizes the high thermal conductivity and low coefficient of thermal expansion of aluminum nitride, combined with a silicone-free elastomer structure, and embeds a thermally conductive skeleton to improve mechanical strength and thermal conductivity.
It achieves the goal of maintaining mechanical strength at high temperatures, lower thermal resistance, more complete contact, optimized heat conduction, and extended service life.
Smart Images
Figure CN223730139U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to heat conducting gasket technical field, especially a kind of composite aluminium nitride heat conducting gasket. BACKGROUND
[0002] Heat conducting gasket is a kind of soft and good elastic heat conducting interface sheet material, fill the concave-convex gap between heat-generating element and heat-dissipating element, realize effective heat transfer, while heat conducting gasket can also play the role of sealing, shock absorption, insulation.
[0003] In order to obtain higher heat conducting gasket, it needs to rely on higher heat conducting filler, aluminium nitride not only far exceeds the heat conductivity of traditional filler such as aluminium oxide, and thermal expansion coefficient is small, and is also electrical insulator, and dielectric performance is good, with the increase of temperature, traditional silicone gasket material softening, creep, stress relaxation phenomenon occurs, and mechanical strength will also decrease. UTILITY MODEL CONTENT
[0004] According to the above-mentioned technical problem to be solved, a composite aluminium nitride heat conducting gasket is provided.
[0005] To achieve the above object, the utility model discloses a composite aluminium nitride heat conducting gasket, including the gasket body of base material and filler, the heat conducting framework embedded in the base material is arranged in the gasket body, the gasket body includes first surface and second surface, the first surface is provided with first heat conducting coating, and the side, away from the gasket body, of first heat conducting coating is provided with protective layer, and the second surface is provided with second heat conducting coating, and the side, away from the gasket body, of second heat conducting coating is provided with release layer.
[0006] Further, the heat conducting framework is a layered frame structure, including the framework body corresponding to the outline of the gasket body, and the flange part is arranged at the end point and the center point position of the framework body.
[0007] Still further, the flange part is a cylindrical structure, and the length direction of the flange part is the same as the thickness direction of the gasket body.
[0008] Still further, the flange part and the surface of the framework body are provided with a composite particle layer.
[0009] Still further, the gasket body, the first heat conducting coating, the protective layer and the second heat conducting coating are pressed into a composite structure, and the gasket body adopts a silicone-free elastomer structure.
[0010] Still further, the first heat conducting coating is an aluminium nitride coating or a boron nitride coating, and a crosslinking agent is added in the first heat conducting coating.
[0011] Still further, the second heat conducting coating is an aluminium nitride coating or a boron nitride coating, and a crosslinking agent is added in the second heat conducting coating.
[0012] Compared with the prior art, the utility model discloses a composite aluminum nitride heat-conducting gasket, and the silicon-free heat-conducting gasket has lower hardness and softer material compared with the traditional silica gel gasket, can contact more completely between the heat source and the radiator, reduces the thermal resistance, optimizes the heat-conducting effect, and the heat-conducting framework embedded in the gasket prolongs the service life of the gasket and does not reduce the mechanical strength of the gasket after long-time use. BRIEF DESCRIPTION OF DRAWINGS
[0013] The utility model will be further explained in detail in combination with the drawings and specific embodiments.
[0014] Figure 1 It is the whole structure schematic diagram of the utility model.
[0015] Figure 2 It is the plan view of the heat-conducting framework of the utility model.
[0016] Figure 3 It is the composite particle layer schematic diagram of the utility model.
[0017] In the drawing: 1 is gasket body;11 is first surface;12 is second surface;2 is heat-conducting framework;21 is framework body;22 is flange portion;3 is first heat-conducting coating;4 is protective layer;5 is second heat-conducting coating;6 is release layer. SPECIFIC EMBODIMENT
[0018] The technical scheme in the embodiments of the utility model will be clearly and completely described in combination with the drawings in the embodiments of the utility model, and obviously, the described embodiments are only a part of the embodiments of the utility model, not all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by the person skilled in the art without creative labor belong to the protection scope of the utility model.
[0019] One embodiment of the utility model, as shown in Figure 1 And Figure 2 The gasket body 1 is provided with the heat-conducting framework 2 embedded in the base material, the gasket body is mainly structured by polyurethane as the base material, ceramic particles such as aluminum nitride, boron nitride as the filler, the gasket body 1 includes the first surface 11 and the second surface 12, the first surface 11 is provided with the first heat-conducting coating 3, the side away from the gasket body 1 of the first heat-conducting coating 3 is provided with the protective layer 4, the second surface 12 is provided with the second heat-conducting coating 5, the side away from the gasket body 1 of the second heat-conducting coating 5 is provided with the release layer 6, the second heat-conducting coating has self-adhesion, tears the release layer and the protective layer in the use process, and the release layer and the protective layer play a good protection effect on the heat-conducting coating before use.
[0020] The heat-conducting skeleton 2 is a layered frame structure, including a skeleton body 21 corresponding to the outline of the pad body 1. The end points and center point of the skeleton body 21 are provided with flanges 22. The skeleton body and the flanges can be hollow to reduce the overall weight.
[0021] The flange 22 has a cylindrical structure. The length direction of the flange 22 is the same as the thickness direction of the gasket body 1. The embedded heat-conducting skeleton extends the service life of the gasket and will not reduce the mechanical strength of the gasket after long-term use.
[0022] like Figure 3 As shown, the flange 22 and the skeleton body 21 are provided with a composite particle layer. The composite particles are deposited on the metal surface by a certain means, so that the modified aluminum nitride powder can better adhere to the skeleton surface.
[0023] Organosilicon resin is added as an adhesive base material between the pad body 1, the first thermally conductive coating 3, the protective layer 4 and the second thermally conductive coating 5, and the two layers are pressed into a composite structure. The pad body 1 adopts a silicone-free elastomer structure, specifically polyurethane or polyimide. Compared with traditional silicone pads, silicone-free thermal pads have lower hardness and are softer, which allows for more complete contact between the heat source and the heat sink, reduces thermal resistance, and optimizes the thermal conductivity. Under the same thermal conductivity conditions, silicone-free thermal pads have lower thermal resistance than silicone-type thermal pads.
[0024] The first thermally conductive coating 3 and the second thermally conductive coating 5 are aluminum nitride coatings or boron nitride coatings. Compared with metal oxides, metal nitrides have a small coefficient of thermal expansion and are also electrical insulators with good dielectric properties. The crosslinking agent makes the second thermally conductive coating slightly tacky, avoiding the use of adhesive backing which would affect the thermal conductivity.
[0025] Working principle: Clean the contact surfaces between the electronic components and the thermal pads. Peel off the release layer and align the thermal pads and heat sinks towards the electronic components. After pasting, peel off the protective layer. Apply appropriate pressure to the thermal pads, heat sinks, and electronic components to ensure their surfaces adhere tightly. Store for a period of time to ensure a firm bond.
[0026] Several points need to be clarified: First, in the description of this application, it should be noted that, unless otherwise specified and limited, the terms "installation," "connection," and "linkage" should be interpreted broadly, and can refer to mechanical or electrical connections, or internal connections between two components, or direct connections. Terms such as "upper," "lower," "left," and "right" are only used to indicate relative positional relationships, and the relative positional relationships may change when the absolute position of the described objects changes. Second, in this document, relational terms such as "first" and "second" are only used to distinguish one entity from another entity, and do not necessarily require or imply any such actual relationship or order between these entities.
[0027] The above examples only illustrate the present application and do not constitute a limitation on the scope of protection of the present application. Any design identical or similar to the present application falls within the scope of protection of the present application.
Claims
1. A composite aluminum nitride heat conducting gasket comprising a gasket body (1) consisting of a base material and a filler, characterized in that, The gasket body (1) is provided with a heat-conducting framework (2) embedded in the base material, the gasket body (1) comprises a first surface (11) and a second surface (12), the first surface (11) is provided with a first heat-conducting coating (3), the side of the first heat-conducting coating (3) away from the gasket body (1) is provided with a protective layer (4), the second surface (12) is provided with a second heat-conducting coating (5), and the side of the second heat-conducting coating (5) away from the gasket body (1) is provided with a release layer (6).
2. The composite aluminum nitride thermal pad of claim 1, wherein, The heat-conducting framework (2) is a layered frame structure and comprises a framework body (21) corresponding to the outline of the gasket body (1), and a flange portion (22) is arranged at the end point and the center point of the framework body (21).
3. The composite aluminum nitride thermal pad of claim 2, wherein, The flange portion (22) is a cylindrical structure, and the length direction of the flange portion (22) is the same as the thickness direction of the gasket body (1).
4. The composite aluminum nitride thermal pad of claim 3, wherein, The flange portion (22) is provided with a composite particle layer on the surface of the framework body (21).
5. The composite aluminum nitride thermal pad of claim 1, wherein, The gasket body (1), the first heat-conducting coating (3), the protective layer (4) and the second heat-conducting coating (5) are pressed into a composite structure, and the gasket body (1) adopts a silicone-free elastomer structure.
6. The composite aluminum nitride thermal pad of claim 1, wherein, The first heat-conducting coating (3) is an aluminum nitride coating or a boron nitride coating, and a crosslinking agent is added into the first heat-conducting coating (3).
7. The composite aluminum nitride thermal pad of claim 1, wherein, The second heat-conducting coating (5) is an aluminum nitride coating or a boron nitride coating, and a crosslinking agent is added into the second heat-conducting coating (5).