Ultralow-resistance chip resistor and manufacturing method thereof

Abstract

The invention discloses a manufacturing method of an ultralow-resistance chip resistor. The manufacturing method comprises the following steps: taking a nickel strip, a copper strip and a precision resistance alloy strip with different thicknesses, and carrying out cold rolling and solid phase compounding to form a three-layer solid phase composite strip blank; carrying out heat treatment annealing on the three-layer solid-phase composite strip blank, then carrying out cold rolling to the specification thickness of the manufactured chip resistor, and then adjusting the electrical property; covering a tin layer on the nickel layer to form a four-layer composite strip; shearing and slitting the four layers of composite strips according to the width size to form material strips; at the upperend of the material belt, cutting tin, nickel and copper layers located in the middle of the belt width, machining and removing same in the length direction to form a groove, and forming a special-shaped four-layer composite material belt with protruding electrode parts on the two sides of the groove; coating an insulating paint on the upper surface and the lower surface of the exposed precise resistance alloy layer of the special-shaped four-layer composite material belt, and then performing sectioning and slicing along the length direction of the special-shaped four-layer composite materialbelt according to the length size of the chip resistor, so that each chip becomes an ultralow-resistance chip resistor with a four-layer composite structure.

Description

technical field [0001] The invention relates to the field of chip resistors, in particular to an ultra-low resistance chip resistor and a manufacturing method. Background technique [0002] With the development of industries and technologies such as aviation, aerospace, navigation, mobile communications, automotive electronics, and medical equipment, the temperature coefficient of resistance, power consumption, long-term stability, antistatic ability, thermal potential, and noise of high-precision chip resistors And other parameters are getting higher and higher. In particular, ultra-low resistance chip resistors have higher requirements for the production of chip resistors due to their low resistance and high current application conditions. At present, the production methods of chip resistors mainly include the following types: [0003] 1. Welding process: [0004] Plasma welding or laser welding is used to splice and weld the resistance layer and copper electrode, and th...

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Problems solved by technology

This process scheme also has the problems of low processing efficiency and high cost, and there are problems such as thin thickness of the electroplating layer on the electrode part, poor electrical and thermal conductivity, and unstable electrical properties; at the same time, the structure of the electroplated metal is relatively loose and the pores are smaller Too much will lead to poor electrical and thermal conductivity, greater heat generation, poor heat dissipation after power-on, increased power consumption, and large fluctuations in resistor resistance and unstable performance. It is not suitable for making ultra-low resistance chip resistors

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