Standardized radiator module simplifies splicing of high-power lamps
The aluminum-based ceramic heat sink based on the three-dimensional heat dissipation topology is under the framework of the three-dimensional heat dissipation topology. In order to further improve the efficiency of the heat sink, a new type of radiator with independent intellectual property rights has been developed, and related patent declarations are already underway. The casting method is one of the effective methods for preparing large-area and thin-plane ceramic materials at present. It adopts a casting technique using water as a solvent instead of an organic solvent, so it has the characteristics of low toxicity and low pollution. The sheet-like Al2O3 porous ceramics with small pore size and through-holes prepared by multi-layer low-temperature casting method have good thermal fatigue characteristics. In addition to the casting method, aluminum-based ceramic composite materials can also be realized by means of dry pressing, vacuum suction casting, micro-arc oxidation and the like. Based on the low-temperature casting method, the aluminum-based ceramic heat sink based on the stereo topology heat dissipation structure is tested by the structural function principle to test the heat resistance and junction temperature of the heat sink. Under the same working conditions, the performance of the 60W heat sink module is improved by about 11%. A standard heat sink module that defines a three-dimensional heat dissipation topology of various powers, so that the specifications of each power source interface are standardized, and the heat sink module can be spliced ​​to form a larger module, which provides a basis for the simplicity and standardization of manufacturing and maintenance, and It does not affect the shape of the lamps, and can be creative on the basis of the modules to form different styles of lamps. Application of casting method and micro-arc oxidation Aluminum-based composite ceramics have high specific strength, specific stiffness, and good wear resistance, which originally originated from the demanding requirements of aerospace technology for material technology. The general aluminum-based composite ceramic materials have the characteristics of high temperature resistance, abrasion resistance, ablation resistance and corrosion resistance. In addition to the casting method, micro-arc oxidation is one of the more used methods. Micro-arc oxidation is a method of treating materials using plasma discharge generated on the surface of an electrode in a liquid medium. The temperature in the plasma discharge channel can reach up to 8000 ° C, and the material composition and surface topography can generally be analyzed by XRD and SEM. In the experiment, the aluminum-based composite ceramic heat sink prepared by us adopts the method of obtaining the alumina powder suspension with the best dispersion stability, and then, after ball milling, adding methyl cellulose and glycerol, etc., continues. The ball mill was milled for a long time, and the ball-milled ceramic slurry was vacuum-deaerated to obtain an Al 2 O 3 ceramic slurry. The ceramic slurry is cast on a cold head which is cold at a low temperature, and the gap between the doctor blades is controlled to be a thin layer, and a single-layer cast sheet can be obtained. After the casting layer is crystallized, the operation is repeated. After lyophilization for a long time, it is sintered at a high temperature and kept for a short time. When the furnace is cooled to room temperature during annealing, an aluminum-based porous alumina ceramic sheet can be obtained. Higher heat dissipation efficiency The thermal resistance curve can be tested by the method of the structure function. First, the forward voltage method can be used to measure the K coefficient of the light source used is 13.386mv/K, the specific heat capacity of the 6063 aluminum material is 900J/Kg.K, and the thermal conductivity of the material is 200W/(mK), while the aluminum-based ceramic heat sink The surface of the alumina ceramic has a thermal conductivity of 25W/(mK) and a specific heat capacity of 859J/Kg.K. The aluminum-based ceramic heat sink has smaller thermal memory properties and the surface is porous ceramic, so it is theoretically better. Thermal characteristics. From the above test data, we can know that the thermal resistance of the aluminum-based ceramic heat sink is about 0.06 less than the thermal resistance of the 6063 aluminum material. It can be seen that under the condition of room temperature of about 25 °C, the heat dissipation efficiency of the aluminum-based ceramic heat sink is higher when the same 60W light source is used, and the efficiency of the heat sink can be improved by about 11% compared with the ordinary three-dimensional heat dissipation structure. . Not only that, the aluminum-based ceramic heat sink has an outer layer of Al2O3 ceramic, which makes the heat sink more safe and easier to pass the safety related test. When applied to outdoor conditions, the surface is less prone to corrosion, thus ensuring the long-term credibility of the lamp. Aiming at the adhesion viscosity of porous ceramics on aluminum-based ceramics, Ren Zhongming et al. prepared porous aluminum-based ceramic materials by dry pressing method by adding silica, which enhanced the adhesion viscosity of ceramic materials. Also for aluminum-based ceramic heat sinks, the adhesion viscosity will be further enhanced for its use in harsh environments, which will be one of the priorities of the next step. For the final heat dissipation performance of the heat sink, the contact properties of different materials will also be different. The following results are based on the TH3000K light source. The K factor of the light source is 13.79mv/K. When the heat transfer medium is thermal grease, the heat dissipation environment is cold. The plates are fixed by screws and the light source is attached to the cold plate for testing. The results show that for the thermal grease, the fastening force has little effect on the heat dissipation performance, and the light source with different fastening force when using the thermal grease is used. The junction temperature at work also indicates that the junction temperatures at which the source operates are not significantly different in either case. At the same time, we found that when aluminum-based flexible graphite sheets are used, a large fastening force is required, otherwise the thermal resistance of the thermal bonding layer is greatly increased. For the same source, a higher thermal resistance means that the source operates at a higher junction temperature, which can exacerbate the attenuation of the source. Standardized module splicing It is assembled into a module heat sink by a single heat sink, and at the same time, the heat sink module is standardized, and can be spliced ​​into a more powerful lamp to realize simple and effective system integration. Based on the modular design, and the matching light source, standard lens, pressure plate, drive power supply, etc., the assembly and maintenance of the luminaire can be simplified. On the basis of this core module, in addition to realizing the unique appearance of the lamps, you can also form your own unique products and brands. Shaanxi Tanghua Energy Co., Ltd. realizes the compatibility and interchangeability of light engines through standardization, and accelerates the wide application of LED technology to provide a better and more efficient high-power LED lighting for luminaire manufacturers, lighting engineering companies and users. Application solution. Standardized design and production not only make the products of each company compatible, easy to replace and maintain, but also facilitate batch production, and the cost is lower, which makes the upstream and downstream supply chain of lighting more suitable, so that it can be more reliable. 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