Check patentability & draft patents in minutes with Patsnap Eureka AI!

Preparation method of conducting nickel powder

A technology of nickel powder and nickel salt, which is applied in the field of preparation of conductive nickel powder, can solve the problems of potential safety hazards and high production costs, and achieve the effect of process control and low cost

Inactive Publication Date: 2012-09-12
CHANGSHA LIYOU METAL MATERIALS
View PDF3 Cites 1 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention aims to provide a preparation method of conductive nickel powder to solve the technical problems of environmental protection, potential safety hazards and high production cost in the production of conductive nickel powder by carbonyl method in the prior art

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of conducting nickel powder

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0019] According to a typical embodiment of the present invention, a preparation method of conductive nickel powder is provided. The preparation method includes the following steps: 1) Perform the first mechanical crushing and screening of the nickel salt to obtain powder, wherein the decomposition temperature T of the nickel salt is d Lower than the Curie temperature T of metallic nickel c ; 2) Under the reducing atmosphere, the powder is decomposed and reduced at a temperature of 250-350°C, and the nickel powder produced by the decomposition and reduction is oriented to accumulate by using the magnetic field orientation; 3) Under the temperature of 550-700°C, the The crude nickel powder is reduced and sintered to obtain conductive nickel powder. Applying the technical scheme of the present invention, adopting the method of magnetic field orientation-step reduction and sintering (decomposition and reduction first, then reduction and sintering) to prepare conductive nickel po...

Embodiment 1

[0031] First, select the decomposition temperature T d Less than the Curie temperature T of metal nickel c Nickel acetate salt is used as raw material with a purity of 99.5%. The nickel acetate salt is baked at a low temperature to remove the water absorbed by the nickel salt or part of the crystal water contained therein. The low-temperature firing temperature is 95° C., the firing time is 60 minutes, and the atmosphere is air. The nickel acetate salt is mechanically crushed into powder by ball milling process, the ball-to-material ratio is 1:1, and the ball milling time is 8 hours. The crushed nickel salt powder is sieved by Taylor standard sieve, and the selection range of mesh number is 200 mesh. The sieving time is 60 minutes, and the under-sieved powder is selected. Subsequently, under a hydrogen atmosphere, the pretreated raw material powder is decomposed and reduced at a medium temperature, and the temperature is controlled at 280°C. At the same time, a magnetic fiel...

Embodiment 2

[0033] First, select the decomposition temperature T d Less than the Curie temperature T of metal nickel cNickel oxalate salt is used as raw material with a purity of 99.7%. The nickel oxalate salt is baked at a low temperature to remove the adsorbed water or part of the crystal water contained in the nickel salt. The low-temperature firing temperature is 120° C., the firing time is 60 minutes, and the atmosphere is air. The nickel salt is mechanically crushed into powder by the ball milling process, the ball-to-material ratio is 5:1, and the ball milling time is 6 hours. The crushed nickel salt powder is sieved by Taylor standard sieve. The time is 120 minutes, and the powder under the sieve is selected. Subsequently, under the atmosphere of decomposing ammonia, the pretreated raw material powder is decomposed and reduced at medium temperature, and the temperature is controlled at 340°C. At the same time, a magnetic field with a magnetic induction intensity B of 0.4T is pla...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Magnetic inductionaaaaaaaaaa
Impedanceaaaaaaaaaa
Impedanceaaaaaaaaaa
Login to View More

Abstract

The invention discloses a preparation method of conducting nickel powder. The method comprises the following steps of: 1), carrying out first mechanical smashing and screening on a nickel salt to prepare powder, wherein the decomposition temperature Td of the nickel salt is lower than the Curie temperature Tc of metal nickel; 2), decomposing and reducing the powder in a temperature condition of 250-350 DEG C in a reducing atmosphere, and directionally stacking a nickel powder crude product generated by the decomposition and the reduction by utilizing the directional action of a magnetic field; and 3), reducing and sintering the nickel powder crude product in a temperature condition of 550-700 DEG C to obtain the conducting nickel powder. By applying the technical scheme of the invention, the appearance of extremely toxic substances such as a medium carbon monoxide and an intermediate product nickel carbonyl for producing the conducting nickel powder by adopting a carbonyl method in the prior art are avoided, and therefore, the preparation method has the process characteristics of safety and environment friendliness. In addition, the preparation method of the conducting nickel powder, which is provided by the invention, also has the advantages of short flow, controllable procedure, low cost and the like.

Description

technical field [0001] The invention relates to the field of nickel powder preparation, in particular to a preparation method of conductive nickel powder. Background technique [0002] Nickel is an important strategic metal. Nickel powder products mainly include reduced nickel powder, electrolytic nickel powder, carbonyl nickel powder, conductive nickel powder, composite nickel powder and nano-nickel powder, etc. [0003] Conductive nickel powder is widely used in the following electromagnetic fields: printed circuit boards, conductive adhesives, integrated circuits, resistors, capacitors, resistor networks, surface assembly of sensitive components and other electronic industries; the field of electrode paste for the production of thick film components; and It is used as a conductive filler to make electromagnetic shielding coatings in the field of electromagnetic shielding, etc. [0004] Compared with ordinary nickel powder, conductive nickel powder has the following perfo...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): B22F9/22
Inventor 陈彬
Owner CHANGSHA LIYOU METAL MATERIALS
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com