Technical process for enhancing stability of NTC heat variable resistor
A technology of thermistors and process methods, applied in the direction of resistors with negative temperature coefficients, etc., can solve the problems of low stability of ceramic chips of NTC thermistors, and achieve the elimination of internal imbalance defects and significant substantive features , to highlight the effect of progress
Inactive Publication Date: 2010-12-01
NANJING SHIHENG ELECTRONICS
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Problems solved by technology
The technical problem to be solved by the present invention is: aiming at the problem of low stability of the NTC thermistor ceramic chip produced above, a sintering manufacturing method that can significantly improve the stability of the NTC thermistor ceramic chip without reducing the qualified rate of the product is proposed. Process method
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The invention relates to a technique method for improving the stability of an NTC thermal resistor chip and belongs to the technical field of the manufacture technique of electronic devices. The technique method comprises the steps of mixing ingredients, ball milling, prepressing forming after drying, isostatic pressing, first sintering, slicing and second sintering. The NTC thermistor ceramic chip is sintered twice in two different process stages to eliminate internal non-equilibrium defects of the NTC thermistor ceramic chip caused by the stress action due to high temperature and machine tooling, and to speed up the stabilization process; meanwhile, a layer of compact sintered molten layer is formed on the surface of ceramic sheets to effectively eliminate the open pores. Thus the invention can significantly improve the stability of the NTC thermal resistor chip to solve the problems that the NTC thermal resistor chip has low stability and bad reliability.
Description
Process Method for Improving the Stability of NTC Thermistor technical field The invention relates to a sintering manufacturing process for a ceramic electronic component chip, in particular to a process for improving the stability of an NTC thermistor chip, belonging to the technical field of electronic device manufacturing. Background technique At present, the conventional complete manufacturing process steps of NTC thermistor are as follows: 1. Ingredients: Mix various conventional metal oxide powders (mainly copper oxide, manganese oxide, nickel oxide, iron oxide, aluminum oxide, cobalt oxide) according to the required ratio. 2. Ball milling: put the prepared powder into the ball mill with water and grinding medium to make the powder into submicron particle fineness. 3. Drying and pre-pressing forming: dry the powder after ball milling, and pre-press it into the set shape in the mold with a press. 4. Isostatic pressing: Put the wrapped pre-pressed ingot into the ...
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IPC IPC(8): H01C7/04
Inventor 汪洋
Owner NANJING SHIHENG ELECTRONICS