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Nickel-zinc ferrite material and preparation method thereof

A technology of nickel-zinc ferrite and raw materials, applied in the field of nickel-zinc ferrite soft magnetic materials for magnetic isolation sheets and their preparation, can solve the problems of small mutual inductance, loose coupling, large leakage inductance, etc., and reduce power loss , the effect of high saturation magnetic induction and high permeability

Inactive Publication Date: 2015-09-16
UNIV OF ELECTRONICS SCI & TECH OF CHINA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The Qi standard is based on electromagnetic induction coupling. Its working principle is similar to that of a transformer. The transmitting coil and receiving coil are usually separated. There is a large air gap between the coils, and the coupling is not tight, resulting in large leakage inductance and small mutual inductance. Wired charging is less efficient

Method used

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  • Nickel-zinc ferrite material and preparation method thereof
  • Nickel-zinc ferrite material and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Step 1, ingredients: according to Fe 2 o 3 49.6 mol%, NiO 13.1 mol%, ZnO 29.2 mol%, CuO 8.1 mol% composition ratio preparation of raw materials.

[0024] Step 2, primary ball milling: mill the raw materials prepared in step 1 in a star ball mill for 2 hours at a speed of 250 r / min, and the mass ratio of raw materials, water and steel balls is 1:1:3.

[0025] Step 3, primary drying: put the powder obtained by ball milling in step 2 into an oven, and dry at 80°C.

[0026] Step 4, pre-calcination: Grind and pulverize the material obtained in step 3, put it into a sintering container for pre-calcination, the temperature is 850°C, and the holding time is 3 hours.

[0027] Step 5, secondary ball milling: 0.05wt% MoO of the total mass of the main component is mixed into the material obtained by pre-calcining in step 4 3 and 0.02wt% Nd 2 o 3 , and then ball milled in a planetary ball mill for 3 hours, the rotating speed is 250r / min, and the ratio of raw material, water and...

Embodiment 2

[0032] Step 1, ingredients: according to Fe 2 o 3 49.6 mol%, NiO 13.1 mol%, ZnO 29.2 mol%, CuO 8.1 mol% composition ratio and weigh raw materials.

[0033] Step 2, primary ball milling: ball milling in a star ball mill for 2 hours, the rotating speed is 250r / min, and the mass ratio of raw materials, water and steel balls is 1:1:3.

[0034] Step 3, primary drying: put the powder obtained by ball milling in step 2 into an oven, and dry at 80°C.

[0035] Step 4, pre-calcination: Grind and pulverize the material obtained in step 3, put it into a sintering container for pre-calcination, the temperature is 850°C, and the holding time is 3 hours.

[0036] Step 5, secondary ball milling: 0.1wt% MoO of the total mass of the main component is mixed in the material obtained by pre-calcining in step 4 3 and 0.01wt% Nd 2 o 3 , and then ball milled in a planetary ball mill for 3 hours, the rotating speed is 250r / min, and the ratio of raw material, water and steel ball mass is 0.75:1:3....

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Abstract

The invention relates to a nickel-zinc ferrite soft-magnetic material for separating magnetic pieces of wireless charging transmitting terminal and receiving terminal coils, and a preparation method thereof. Raw materials of the nickel-zinc ferrite soft-magnetic material comprise a main component and an auxiliary component, and the main component comprises, by respective reference substances, 49.6-50.5mol% of Fe2O3, 12.5-13.5mol% of NiO, 29.2-32mol% of ZnO, and 7-9mol% of CuO. The auxiliary component comprises, by respective reference substances, 0.01-0.1wt% of MoO3 and 0.01-0.05wt% of Nd2O3. The nickel-zinc ferrite is prepared through a traditional oxide method; in a frequency region of 100-200KHz, the saturated magnetic induction intensity Bs is not smaller than 380mT, the coercive force Hc is not greater than 30A / m, and the magnetic permeability [mu]' is not smaller than 700 and not greater than 900; and the power loss Pcv of the material at normal temperature under 50KHz and 150mT is not smaller than 330mW / cc and not greater than 380Mw / cc.

Description

technical field [0001] The invention belongs to the technical field of soft magnetic ferrite, and relates to a nickel-zinc ferrite soft magnetic material for a magnetic isolation sheet of a wireless charging transmitting end and a receiving end coil and a preparation method thereof. Background technique [0002] With the development of science and technology, all kinds of electronic products are changing with each passing day. However, almost every electronic product needs to be accompanied by a charger and the charging devices are not compatible with each other. Dangerous, low security, therefore, wireless charging came into being. Compared with traditional chargers, wireless charging is safer, easier to carry, smarter, with automatic shutdown function when fully charged, and can automatically identify different devices and their energy requirements . In 2010, my country introduced the Qi standard launched by the Wireless Charging Consortium (WPC) for wireless charging sta...

Claims

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Application Information

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IPC IPC(8): C04B35/26C04B35/622
Inventor 梁迪飞姜维海李维佳周毅然吴健苇张杰
Owner UNIV OF ELECTRONICS SCI & TECH OF CHINA
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