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Carbon-coated magnetic superfine iron particle and its manufacturing method

A carbon coating and magnetic technology, applied in the direction of coating, can solve the problems of harsh reaction conditions, difficult to prepare in large quantities, and high raw material requirements, and achieve the effect of small particle size, low raw material requirements, and high saturation magnetization.

Inactive Publication Date: 2007-03-28
SHANGHAI HUAMING HI TECH GRP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Zhang Xianping et al plasma-coated carbon nano-iron particles in an acetylene atmosphere (Preparation of carbon-coated iron nanoparticles in an acetylene atmosphere and its characterization, Journal of Qingdao University of Science and Technology, 2004, 25(1), 30-32), the The method requires high raw materials, harsh reaction conditions, and is difficult to prepare in large quantities

Method used

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  • Carbon-coated magnetic superfine iron particle and its manufacturing method
  • Carbon-coated magnetic superfine iron particle and its manufacturing method

Examples

Experimental program
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Embodiment 1

[0031] Take 5g of sodium chloride and 5g of ferric oxide with an average particle diameter of 10nm, add 80g of steel balls with a diameter of 6mm and dry mill for 24 hours at a speed of 300 rev / min, weigh 1g of sodium chloride after ball milling and The mixture of ferroferric oxide is spread on the bottom of the ark, and placed in the constant temperature zone of the tubular reactor. The outlet of the reactor is at normal pressure. After 30 minutes of hydrogen flow at a flow rate of 30ml / min, the temperature starts to rise, and the heating rate is 20°C / min. , control the temperature at 600°C, and perform the reduction reaction for 2 hours. Adjust the flow rate of hydrogen to 5ml / min to lower the temperature to 450°C, inject 100ml / min of nitrogen and 10ml / min of acetylene, coat the reaction for 30min, turn off nitrogen and acetylene, and drop to room temperature under the protection of hydrogen, and the product is used up Washing with ion water (until silver nitrate is added to...

Embodiment 2

[0034] Ball milling and reduction are the same as in Example 1, except that the reduction reaction temperature is 500° C., and the spacer is potassium chloride; the carbon coating reaction conditions are the same as in Example 1, except that the carbon source acetylene is changed to 50% each of ethanol and acetylene ( Volume ratio).

[0035] According to electron microscope analysis, the product is granular (see Figure 3), and the particle size of the product is mainly 20-300nm; the specific saturation magnetic strength is 143emu / g and the residual magnetization is 1.37emu / g when the vibrating sample magnetometer is tested. After one month, the test specific saturation magnetization is 139emu / g; the thermogravimetric balance (TG) analysis test shows that its oxidation resistance temperature is 420°C; the X-ray diffraction test (see accompanying drawing 4) shows that iron exists in the α-Fe phase in the product, containing Trace amounts of iron sulfide and iron oxide, in which ...

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Abstract

The present invention discloses a kind of magnetic superfine iron granules covered by carbon. Its average grain size is 50-400 nm, and its composition includes (by wt% 65-85% of magnetic iron and 15-25% of carbon. Said magnetic superfine iron granules can be used as magnetic powder for making magnetic recording and can be used as carrier material for preparing magnetic target medicine.

Description

technical field [0001] The invention relates to a carbon-coated magnetic ultrafine iron particle and a preparation method thereof, in particular to a method for surface treatment of the ultrafine iron particle by chemical vapor deposition. technical background [0002] Iron is an element that is abundant in nature and widely used by humans. Typically, iron is used as a bulk structural material and is ferromagnetic. Nanomagnetic materials have special properties such as superparamagnetism. Ultrafine iron particles have become a research hotspot as high-density magnetic recording materials, electromagnetic wave absorbing materials, magnetic fluids, magnetically targeted drug carriers, or composited with other materials to prepare functional materials. However, nano-iron particles are very active due to their huge surface energy, and pure nano-iron particles cannot exist stably in the air, which limits the application of nano-iron particles. The existing literature shows tha...

Claims

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Application Information

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IPC IPC(8): B22F1/02
Inventor 吴秋芳曹宏明宣昭峰马新胜张银燕黄广建甘军
Owner SHANGHAI HUAMING HI TECH GRP
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