MnB Magnetic Material Preparation via Solid Reaction
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Solution Overview
Problem
Existing methods for producing MnB-based magnetic materials require special equipment and are difficult to control in terms of particle size and shape, and they limit the control of physical properties for electromagnetic wave absorption or shielding due to high-temperature melting or long heat treatment processes.
Innovation Solution
A method involving the preparation of a mixture of manganese oxide and boron, potentially with calcium oxide or transition/lanthanide metal oxides, heat-treated under an inert atmosphere to achieve a MnB-based magnetic material through a single-step solid chemical reaction, allowing for controlled particle size and efficient production.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If high-temperature melting or long heat treatment is used, then MnB-based magnetic material can be produced, but particle size and shape cannot be controlled and energy consumption increases
Solution Approach 1:
The patent changes the chemical composition parameters by introducing specific elements (Co, Ni, Cu, Zn, Al, Si, Ca, Mg, rare earth elements) in controlled amounts to modify the sintering behavior and particle growth characteristics, enabling particle size control without excessive energy input. The atomic ratios of these elements are precisely adjusted to achieve desired particle morphology.
Solution Approach 2:
The patent creates composite magnetic materials by combining MnB base phase with secondary phases formed from the added elements. These composite structures allow control of particle size and shape through phase distribution and interface effects, while the synergistic combination of elements reduces the energy required for sintering and particle formation.
2Ease of manufacture
If arc melting or induction melting equipment is used, then MnB-based magnetic material can be produced, but special equipment requirements increase production complexity
Solution Approach 1:
The patent replaces complex thermal processing systems (arc melting, induction melting) with a simpler powder metallurgy approach. By using elemental powders and performing sintering in a controlled atmosphere, the process eliminates the need for specialized melting equipment while achieving comparable or superior material properties through chemical reactions and phase formation during sintering.
3Productivity
If high-pressure compression followed by long heat treatment is used, then MnB-based magnetic material can be produced, but preparation time increases
Solution Approach 1:
The patent performs preliminary mixing of elemental powders with precise stoichiometric ratios before sintering. This pre-mixing ensures homogeneous distribution of all elements, allowing the sintering process to proceed rapidly without requiring prolonged heat treatment for diffusion and phase formation. The preliminary preparation of the powder mixture enables fast processing while maintaining precise control over the final material properties.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This method enables the efficient and economic production of MnB-based magnetic materials with controlled particle size, reducing energy consumption and preparation time, while achieving effective electromagnetic wave absorption or shielding properties.
Implementation Method 1
heat-treating the mixture under an inert atmosphere
Implementation Method 2
controlling physical properties for absorption or shielding of electromagnetic waves by inducing hysteresis loss
Data Source
AI summary
A method of preparing a MnB-based magnetic material, the method including the steps of preparing a mixture including manganese oxide and boron, and heat-treating the mixture under an inert atmosphere, a MnB-based magnetic material prepared thereby, and a material absorbing or shielding electromagnetic waves, or a semiconductor, electronic, communication, or display device including the MnB-based magnetic material, are provided.