What are the purposes and precautions of dispensing?

The vibrator and the base assembly are firmly combined together.

Materials and spare parts

1 resonator on the upper frame

2 conductive adhesive (DAD-50)

3 gloves

4 acetone (analytically pure)

Equipment and tools

1 small brush

2 plug tray

3 electric blower box (SC 10 1, 1℃)

4 tunnel furnace

5 Multimeter (Level 2.5)

operation sequence/order

1 Dilute the conductive adhesive with acetone and stir it evenly, neither too thick nor too thin.

2 Dip a little conductive adhesive with a small brush, and apply a proper amount of conductive adhesive at the outer point of the contact part between the vibrator and the reed card hole.

3. Put the bonded resonator together with the plug into the hair dryer box, raise the temperature to 65438 050℃ 5℃, keep the temperature for more than 2 hours, and take it out when the temperature drops below 80℃; Or put the glued resonator together with the plug board into a tunnel furnace and bake at both ends of 1 50℃ 5℃ and between 170℃~ 180℃/hour.

quality requirements

1 The dispensing should be uniform, and the dispensing amount on both sides should be basically equal.

After baking, the silver layer should be free of yellowing and other stains.

Matters needing attention

1 conductive adhesive should be stirred every 3 minutes, and its quality should be observed.

Conductive adhesive should cover the hole of the reed, but it can't penetrate into it, let alone flow to the base or hang glue.

Don't leak some glue.

The baking temperature should be controlled within the specified range, and the baking time should be guaranteed.

5 conductive adhesive should be stored in the refrigerator when not in use.

explain

1 the quality and preparation conditions of conductive adhesive and base assembly have great influence on the important characteristics of crystal elements-resonance resistance. Therefore, it is stipulated that the X-L R control chart should be used to control the contact resistance between the vibrator electrode and the reed of the base assembly.

2 The specific operation is as follows: take 25 baked resonant parts at a time, leave them at room temperature for half an hour, and then measure the resistance between the vibrator electrode and the base assembly reed with a multimeter near the glue dispensing (the iron pen should not touch the conductive adhesive) for drawing analysis. Test once every Monday and Thursday. When a new batch of conductive adhesive or base assembly is used, the contact resistance should be detected and a new control chart should be drawn in time.