Preparation process of high-purity micron-sized metal nickel powder based on automobile current sensor

High-purity micron-sized metallic nickel powder is prepared by a three-stage process, which solves the problems of low sphericity, wide particle size distribution and easy oxidation of nickel powder in the existing technology. It achieves high-purity, high-sphericity and uniform particle size nickel powder, which is suitable for the long-term stable operation of automotive current sensors.

CN122352912APending Publication Date: 2026-07-10ZHEJIANG JIATAI HEQING TECH CO LTD
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Patent Information

Application Number
CN202610486987.5
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2026-04-14
Publication Date
2026-07-10

AI Technical Summary

Technical Problem

Existing processes make it difficult to prepare high-purity, highly spherical, and uniformly sized micron-sized nickel powder, which leads to easy oxidation of automotive current sensors in high-temperature environments and poor signal stability and reliability.

Method used

A three-stage process of raw material pretreatment, synergistic treatment and post-treatment is adopted, including mechanical grinding, ultrasonic cleaning, air jet milling, complexation-hydrogen reduction-catalysis synergistic process, plasma spheroidization treatment and gradient composite modification, to form a firmly bonded gradient composite modification layer, ensuring high purity, sphericity and interfacial properties of nickel powder.

Benefits of technology

High-purity (≥99.99%) and uniform particle size (1-3μm, sphericity ≥0.94) nickel powder was prepared, which improved the detection accuracy and service life of automotive current sensors and solved the problems of oxidation and bonding force of sensors in high-temperature environments.

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Abstract

The invention relates to the technical field of current sensors, in particular to a preparation process of high-purity micron-sized metal nickel powder based on an automobile current sensor, and the preparation process comprises the steps of raw material pretreatment, cooperative treatment and post-treatment which are carried out in sequence; all the process steps are not simply superposed, but a complete collaborative system with purity guaranteed by purification, dispersion guaranteed by passivation, morphology guaranteed by spheroidization and performance guaranteed by modification is formed, and the finished product quality and batch consistency are further stabilized in cooperation with post-treatment vacuum drying, precise screening and vacuum packaging. The whole process can achieve continuous production, the yield is high, energy consumption is lower, the prepared nickel powder meets the requirements for high purity, narrow particle size, high sphericity degree, high oxidation resistance, high hydrophobicity and high interface bonding force at the same time, the long-term stable working requirement of the automobile current sensor is completely met, the precision and reliability of the sensor are remarkably improved, the service life of the sensor is remarkably prolonged, and the application prospect is wide. And the method has both technical advancement and industrial practicability.
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