Material Processing Technology for Soft Ferrites Manufacturing

Abstract

In this paper efforts have been made to explain the manufacturing method of Manganese-Zinc (Mn-Zn) soft ferrites in detail along with its uses and applications. The same method is applicable to Nickel-Zinc (Ni-Zn) and Lithium Titanium (Li-Ti or Microwave) ferrites also. A process flow chart is shown. The manufacturing steps like-mixing of powders, calcination of powder, grinding of powder, granules making, pressing of components, sintering in tunnel kiln or box furnace and machining on rotary table grinding machine, have been explained. Effect of atmosphere (oxygen), when the components are sintered at high temperature, is discussed. The temperature profiles of muffle furnace and tunnel kilns have also been discussed. The variation in temperature within the muffle furnace (900×900×800 mm) has been studied with the help of a sliding thermocouple. Temperature gradient within the furnace volume has been plotted on graph. A mathematical relation has been found using curve fitting equation. Actual and mathematical results have been compared.

Highly Efficient 11.1-kW Wireless Power Transfer Utilizing Nanocrystalline Ribbon Cores

“…It is difficult to make ferrite cores with large footprints, particularly when the ratios length-to-thickness and widthto-thickness are large. Manufacturing ferrite cores of large footprints result in large temperature gradients across the body which result in high stress and ultimately in product cracking [5]. Thus, core bars or core plates made of an array of smaller tiles are better alternatives.…”

“…First, it is brittle and prone to mechanical breakage. Moreover, ferrite cores have a low flux density saturation point, which presents challenges for the design of compact and high-power IPT systems [5]. Furthermore, the magnetic properties of ferrite change drastically with temperature.…”

Novel Approaches to the Design of an Ultra-Fast Magnetorheological Valve for Semi-Active Control

“…However, they have high electrical resistivity, thus preventing the formation of the eddy currents. Other problems with these materials are their low mechanical strength, low impact resistance, high cost, and in the most cases poor machinability [ 45 ]. On the other hand, the material approach is commonly used in electrical engineering for electromagnetic valves or high frequency transformer and inductor cores in switching power supplies [ 46 , 47 ].…”

A Robust Metal Oxide Thin Film with Cryogenic Saturation Magnetization Exceeding 2 Tesla

“…12 In power electronics, hysteresisless magnetic materials with high saturation magnetization and high susceptibility facilitate the construction of high-frequency electronics and soft ferrites without need for excessive cooling capacity. [13][14][15][16][17][18] Magnetic materials have been categorized into three types: diamagnetic, ferromagnetic, and paramagnetic 10 (Figure 1). In a diamagnet, the magnetic moments align…”