Coated fine metal particle and process for producing the same

一种金属微粒、制造方法的技术，应用在金属加工设备、运输和包装、薄料处理等方向，能够解决不能满足磁珠子高耐腐蚀性、金属微粒烧结、生产效率低等问题，达到沉降速度慢、简单耐腐蚀性、高耐腐蚀性的效果

Inactive Publication Date: 2011-02-16
PROTERIAL LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, since the metal-containing material particles are heat-treated at an extremely high temperature of 1600-2800°C, the metal particles may be sintered, and the production efficiency is low.
In addition, since graphite has a structure in which graphene sheets are stacked, when spherical metal particles are coated, lattice defects are inevitably introduced.
Therefore, it is not suitable for applications requiring high corrosion resistance, such as magnetic beads.

Method used

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  • Coated fine metal particle and process for producing the same
  • Coated fine metal particle and process for producing the same
  • Coated fine metal particle and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

reference example 1

[0097] α-Fe with a median particle size of 0.03 μm 2 o 3 The powder and TiC powder with a median particle size of 1 μm were mixed with a ball mill at a mass ratio of 7:3 for 10 hours, and the resulting mixed powder was heat-treated in an alumina boat at 700°C for 2 hours in nitrogen. The X-ray diffraction pattern of the sample powder obtained is shown in figure 1 middle. figure 1 The horizontal axis of represents the 2θ (°) of diffraction, and the vertical axis represents the diffraction intensity (relative value). As a result of analysis based on the analysis software "Jade, Ver.5" manufactured by MDI Corporation, the diffraction peaks were identified as α-Fe and TiO 2 (rutile structure).

[0098] The average crystallite size of Fe calculated from the half-value width of the (200) peak of α-Fe using the Scherrer formula was 90 nm. TiO obtained at 2θ=27.5° 2 The half value width of the largest diffraction peak is 0.14, TiO 2 The ratio of the intensity of the maximum dif...

reference example 2

[0102] Reference example 2 to reference example 5

[0103] In addition to the α-Fe 2 o 3 Except that the masses of the powder and TiC powder were changed as shown in Table 1, sample powder was produced and purified in the same manner as in Reference Example 1 to obtain magnetic particles. The composition and magnetic properties of these magnetic particles were measured in the same manner as in Reference Example 1. The results are shown in Table 1.

[0104] α-Fe 2 o 3 The magnetic particle of Reference Example 5 obtained by setting the mass ratio of powder to TiC powder to 4:6 has high corrosion resistance, but the saturation magnetization Ms becomes 48Am 2 / kg, less than 50Am 2 / kg, the coercive force iHc becomes 18kA / m, exceeding 15kA / m. From the above, it can be seen that the TiC compounding ratio is preferably 30 to 50% by mass in order to maintain a high saturation magnetization value by utilizing the characteristics of the metal Fe particles.

[0105] [Table 1]

...

reference example 6

[0110] Magnetic-coated metal fine particles were obtained in the same manner as in Reference Example 1 except that the heat treatment temperature was set to 800°C. The magnetic properties of this sample powder were measured in the same manner as in Reference Example 1. The amount of C in the sample powder was measured by a high-frequency heating infrared absorption method (EMIA-520 manufactured by HORIBA), and the amount of N was measured by a heat conduction method (EMGA-1300 manufactured by HORIBA) in an inert gas. The results are shown in Table 2.

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Abstract

A process for producing coated fine metal particles comprising core particles of a metal which have been coated with a titanium oxide and a silicon oxide in this order, characterized by: mixing a powder comprising TiC and TiN with a powder of an oxide of a metal (M) having a standard free energy of formation (delta GM-O) satisfying the relationship delta GM-O>delta GTiO2, heat-treating the mixture in a non-oxidizing atmosphere to reduce the metal (M) oxide with the powder comprising TiC and TiN and coat the surface of the resultant metal (M) particles with a titanium oxide, subsequently coating the surface of the titanium oxide coating with a silicon oxide, and classifying the resultant particles so as to obtain particles having a median diameter (d50) of 0.4-0.7 [mu]m and a coefficient of variation indicating particle diameter distribution width [=(standard deviation) / (average particle diameter)] of 35% or less. Also provided are coated fine metal particles comprising core particles of a metal which have been coated with a titanium oxide and a silicon oxide in this order, characterized by having a median diameter (d50) of 0.4-0.7 [mu]m and a coefficient of variation indicating particle diameter distribution width [=(standard deviation) / (average particle diameter)] of 35% or less.

Description

technical field [0001] The present invention relates to magnetic recording media such as magnetic tapes and magnetic recording disks, electronic devices such as radio wave absorbers, inductors, and printed circuit boards (soft magnetic materials such as yokes), photocatalysts, magnetic beads for nucleic acid extraction, and microspheres for medical use. Coated metal particles used in and methods of making the same. Background technique [0002] With the increase in performance and reduction in size and weight of electronic equipment and electronic devices, the materials constituting them are required to achieve higher performance and miniaturization. For example, in magnetic particles coated on a magnetic tape, in order to increase the magnetic recording density, both micronization and magnetization improvement are required. [0003] In addition, in order to isolate and recover proteins such as antigens to diagnose diseases such as allergies, the magnetic separation method ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B22F9/20B22F1/02B22F1/16
CPCC22C1/058B22F1/02B22F2999/00B22F9/20Y10T428/2993B22F1/16B22F1/142B22F1/145
Inventor 所久人中林崇藤井重男
Owner PROTERIAL LTD
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