Nickel powder and production method thereof

A manufacturing method, micropowder technology, applied in the direction of transportation and packaging, metal processing equipment, etc., can solve the problems of shrinkage characteristics without any disclosure, thick oxide film thickness, difficult to form thickness, etc., to prevent discontinuity or peeling, crystallinity Excellent, prevent cracking or peeling effect

Active Publication Date: 2012-09-12
SUMITOMO METAL MINING CO LTD
View PDF7 Cites 10 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0023] However, in this proposal, although the oxidation resistance of the obtained nickel powder is evaluated, there is no disclosure on the shrinkage characteristics during firing.
In addition, nothing is said about the decomposition behavior of the above-mentioned debinders
In addition, sin

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
  • Nickel powder and production method thereof
  • Nickel powder and production method thereof
  • Nickel powder and production method thereof

Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0136] [Example 1]

[0137] The high-frequency plasma is ignited with a plasma input power of about 60kW, and the total amount of argon is adjusted to 209L / min, hydrogen is 45L / min, and the ambient gas pressure is 60kPa to obtain a stable plasma flame. The nickel raw material was supplied into the plasma flame at 1 kg / hr by the carrier gas (argon 10 liters / minute) to prepare fine powder.

[0138] In addition, as the nickel raw material, 90% by mass of nickel powder (nickel, Type 255, average particle size of 2.2 to 2.8 μm, manufactured by Inco Special Products and Inco Limited) mixed with 10% by mass of nickel oxide (added with about 2 Mass% sulfur) made of nickel raw material. The sulfur content in the nickel raw material was 0.2% by mass, and the oxygen content was 2% by mass.

[0139] The plasma is 10,000°C or higher. Therefore, the nickel raw material powder evaporates and vaporizes instantaneously, and is condensed in the low-temperature plasma tail flame to be micronized. Th...

Example Embodiment

[0142] [Example 2]

[0143] Except that the hydrogen gas supplied to the plasma was set to 9 L / min, the same operation as in Example 1 was carried out to obtain nickel fine powder and evaluated. The BET diameter of the nickel fine powder is 152 nm. The nickel fine powder was analyzed by XRD, and the crystal grain size obtained by Scherrer method was The crystal grain size is 85% of the BET diameter, and it can be seen that nickel fine powder with crystallinity close to single crystal is formed. The sulfur and oxygen contents are 0.24% by mass and 1.0% by mass, respectively. Based on the measurement result of TMA, the shrinkage initiation temperature was about 360°C and the shrinkage rate was 7.9%. The results of each evaluation are shown in Table 1 together with other examples.

[0144] In addition, as a result of FE-AES analysis, the thickness of the oxygen-containing coating layer was as thin as 14 nm. In addition, the thickness of the sulfur-containing layer was 8 nm. The ...

Example Embodiment

[0145] [Example 3]

[0146] Except for using the following nickel powder as the nickel powder, the same operation as in Example 1 was carried out to obtain nickel fine powder and evaluated. 4kg of nickel powder (nickel, Type255, average particle size of 2.2~2.8μm, manufactured by Inco Special Products and Inco Limited) was added to 16L of pure water adjusted to 50°C, and 18g of sodium hydrosulfide hydrate (Sodium hydrosulfide n- hydrate), stirring for 30 minutes. Then, it was subjected to repulping (Re Pulp) once, filtered, vacuum-dried (36 hours), and then crushed and used as a nickel raw material. The sulfur content in the nickel raw material is 0.2% by mass, and the oxygen content is 0.4% by mass.

[0147] The BET diameter of the nickel powder is 125 nm. The nickel fine powder was analyzed by XRD, and the crystal grain size obtained by Scherrer method was The crystal grain size is 75% of the BET diameter, and it can be seen that nickel fine powder with crystallinity close to...

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
Thicknessaaaaaaaaaa
Particle sizeaaaaaaaaaa
Thicknessaaaaaaaaaa
Login to view more

Abstract

Disclosed is a nickel powder having excellent crystallinity and a high shrink temperature, inhibiting sintering contraction even at high temperatures without affecting the decomposition temperature of the resin binder. Also provided is a production method for the nickel powder. The average particle diameter of the nickel powder is 0.05 - 0.3[Mu]m, crystalline diameter is 60% - 90% of specific surface area diameter, sulphur content is 0.1% - 0.5% by weight, and oxygen content is 0.4% - 1.5% by weight. The powder has a 2 - 15nm thick oxygen-containing surface coating layer with an outermost surface formed from a mixture of a nickel-sulphur compound and a nickel-oxygen compound. Furthermore, in x-ray photoelectron spectroscopy analysis, the outermost layer should preferably have an abundance ratio of 50% - 100% nickel sulphide in the sulphur compound and an abundance ratio of 0% - 50% of nickel hydroxide in the nickel-oxygen compound.

Description

technical field [0001] The invention relates to a nickel micropowder and a manufacturing method thereof. More specifically, it relates to nickel fine powder used as an electrode material for electronic components such as internal electrodes of a multilayer ceramic capacitor, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. "Japanese Patent Application No. 2009-219286" filed on September 24, 2009 in Japan, and the above application is cited for reference in this application. Background technique [0003] In recent years, there has been a demand for miniaturization of electronic devices, and in order to meet this demand, finer nickel powders used as materials for components of electronic devices have also been required to be more finely divided. For example, in multilayer ceramic capacitors (MLCC: Multilayer Ceramic Capacitor), it is required to reduce the particle size of nickel fine powder in order to co...

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): B22F1/02B22F1/00B22F9/02B22F1/16
CPCB22F9/12B22F2999/00C22C19/03B22F1/16B22F2202/13B22F9/02B22F2301/15
Inventor 川上裕二石田荣治田中宏幸冈田美香金子勋
Owner SUMITOMO METAL MINING CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

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

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap