A kind of ultra-low resistance chip resistor and its manufacturing method

Abstract

A method for manufacturing an ultra-low resistance chip resistor, comprising the following steps: taking nickel strips, copper strips, and precision resistance alloy strips with different thicknesses by cold-rolling and solid-phase compounding them into three-layer solid-phase composite strip blanks; The solid-phase composite strip blank is heat-treated and annealed and then cold-rolled to the thickness of the chip resistor specifications, and then the electrical properties are adjusted; the nickel layer is covered with a tin layer to form a four-layer composite strip; the four-layer composite strip is divided according to the width size. Cut strips to form a strip; at the upper end of the strip, the three layers of tin, nickel and copper located in the middle of the strip are removed by cutting along the length direction to form a groove, and a special-shaped four-layer with raised electrodes on both sides of the groove is formed. Composite tape; apply insulating paint on the upper and lower sides of the exposed precision resistance alloy layer of the special-shaped four-layer composite tape, and then cut into slices according to the length of the chip resistor along the length direction of the special-shaped four-layer composite tape to make Each piece becomes an ultra-low 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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