What kind of adhesive can be used for special ceramics?
2022 05/16
The packaging of special ceramic LEDs mainly includes Ceramic Tubes three types: dispensing, potting and molding. Basically, the difficulty of process control is air bubbles, lack of material and black spots. The design is mainly about the selection of materials, and the selection of epoxy and brackets with good combination. (General LEDs cannot pass the air tightness test). LED Dispensing TOP-LED and Side-LED are suitable for Machinable Ceramic Bushing dispensing packaging. Manual dispensing and encapsulation requires a high level of operation (especially for white LEDs), and the main difficulty is the control of the amount of glue dispensed, because the epoxy will thicken during use. The dispensing of white LEDs also has the problem of chromatic aberration caused by the precipitation of phosphor powder. LED potting packaging Lamp-LED packaging is in the form of potting. The Macor Ceramics process of potting is to first inject liquid epoxy into the LED molding cavity, then insert the pressure-welded LED bracket, put it in an oven to cure the epoxy, and then remove the LED from the cavity to form. LED molding package Put the pressure-welded LED bracket into the mold, close the upper and lower molds with a hydraulic press and vacuumize, put the solid epoxy into the entrance of the injection channel, and press the hydraulic ejector into the mold rubber channel for heating. The epoxy enters each LED molding tank along the glue channel and cures. LED curing and post-curing curing refers to the curing of the encapsulated epoxy, and the general epoxy curing conditions are 135 ° C for 1 hour. Molded Silicon Nitride Parts packaging is generally at 150 ℃, 4 minutes. Post-curing is to allow the epoxy to fully cure while thermally aging the LED. Post-curing is very important to improve the bond strength of the epoxy to the bracket (PCB). The general conditions are 120°C, 4 hours. LED cutting ribs and dicing Since the LEDs are connected together in production (not single), Lamp package LEDs use cutting ribs to cut off the connecting ribs of the LED bracket. SMD-LED Silicon Nitride Ceramic Pin is on a PCB board and requires a dicing machine to complete the separation work. Test the optoelectronic parameters of the LED, inspect the external dimensions, and sort the LED products according to customer requirements. With the great progress of LED technology in the 1990s, not only the luminous efficiency exceeds that of incandescent lamps, the light intensity has reached the level of candlelight, but the color also covers the entire visible spectrum from red to blue. This technological revolution from the level of indicator lights to levels beyond general-purpose light sources has led to a variety Silicon Nitride of new applications, such as automotive signal lights, traffic lights, large outdoor full-color displays, and special lighting sources. With the progress of high-brightness and polychromatic light-emitting diodes, the application field is also expanding. From the lower luminous flux indicator to the display screen, from the outdoor display screen to the medium luminous flux power signal lamp and the white light source for special lighting, and finally Developed to the upper right corner of the high-flux general lighting source. The year 2000 is the dividing line of time. In 2000, the Zirconia Ceramic Sleeve signal display problems and lighting problems of all colors have been solved, and special lighting applications with low and medium luminous flux have begun. However, as a Ceramic Tubes general lighting application of high luminous flux white light lighting, it seems that it will take time. In order to achieve this, it is necessary to further increase the luminous flux significantly. Of course, this is also a process, which will be gradually realized as the brightness increases and the price decreases.