Abstract
The magnetic force of a magnet is a crucial characteristic that determines its applications in various fields, from industrial manufacturing to consumer electronics. This paper aims to investigate whether magnets with the same grade and volume exhibit identical magnetic forces. By exploring the fundamental concepts of magnet grades, volume - related factors, and the complex nature of magnetic force generation, along with practical experimental analysis and real - world case studies, we will comprehensively analyze this question. The study reveals that while grade and volume are significant factors, other elements such as magnetization direction, shape, temperature, and external magnetic fields also influence the magnetic force, indicating that magnets with the same grade and volume do not necessarily have the same magnetic force.

Root Cause of the Sharp Increase in Residual Loss of Ferrites in the MHz Frequency Range

1. Introduction to Ferrite Magnets and Their Limitations
Ferrite magnets, composed primarily of iron oxide (Fe₂O₃) and strontium carbonate (SrCO₃) or barium carbonate (BaCO₃), are ceramic materials manufactured via sintering. They dominate the low-to-moderate magnetic strength market due to their cost-effectiveness, abundance of raw materials, and high electrical resistance (reducing eddy current losses). However, their lower saturation magnetization and coercivity compared to rare-earth magnets (e.g., neodymium) limit their use in high-performance applications. This analysis explores viable alternatives, focusing on materials that balance cost, performance, and sustainability.

Application Scenarios of Ferrite and Neodymium Magnets: A Comprehensive Analysis

Price Differences and Underlying Reasons Between Ferrite and Neodymium Magnets

Magnetic Strength FundamentalsFerrite magnets, also known as ceramic magnets, are composed of iron oxide (Fe₂O₃) mixed with strontium or barium carbonate. Their magnetic strength is moderate, typically ranging between 0.2–0.5 Tesla, making them 2–7 times weaker than neodymium magnets of similar size. Neodymium magnets (NdFeB), composed of neodymium, iron, and boron, are the strongest permanent magnets available, with magnetic fields up to 1.4 Tesla. This disparity in strength is critical for applications requiring compact, high-performance solutions.

Practical ImplicationsThe weaker magnetic field of ferrite magnets limits their use in applications demanding high force density. For example, a neodymium magnet can hold objects many times its weight, whereas a ferrite magnet of the same size would struggle. This difference is evident in consumer electronics: neodymium magnets are preferred in portable audio devices (e.g., headphones, speakers) due to their compact size and strong magnetic field, which enhances sound clarity and efficiency. Ferrite magnets, being bulkier, are more common in stationary setups like refrigerator magnets or magnetic boards.

When using ferrite magnetic rings to suppress electromagnetic interference (EMI), the installation location is a critical factor that determines their effectiveness. Below are the specific requirements for installation location and the reasons for positioning them as close as possible to the source of interference:

When ferrite magnets come into contact with certain materials or objects, they can cause a range of adverse effects, including physical damage, chemical degradation, electromagnetic interference, and safety hazards. These interactions may compromise the magnet’s structural integrity, magnetic performance, or even pose risks to human health and surrounding equipment. Below is a detailed analysis of these adverse effects, the items that cause them, and strategies to avoid such situations during use.

When storing ferrite magnets, several environmental factors must be carefully controlled to maintain their magnetic properties, structural integrity, and long-term reliability. Key considerations include humidity, temperature, mechanical stress, corrosive environments, and electromagnetic interference, each with specific requirements to prevent degradation. Below is a detailed analysis of these factors and their corresponding storage requirements:

When processing ferrite magnets, diamond-coated cutting tools are the most suitable choice due to their unique material properties and the specific challenges posed by ferrite magnets. Below is a detailed analysis of why diamond-coated tools are preferred, covering their advantages, the limitations of alternative tools, and the underlying scientific principles:

Abstract
Ferrite magnets, also known as ceramic magnets, are widely used in various industries due to their cost-effectiveness, high electrical resistivity, and excellent corrosion resistance. However, their manufacturing process—primarily powder metallurgy—presents several challenges, including slag fall-off (surface defects) and difficulty in ensuring dimensional accuracy. These issues can compromise the mechanical integrity, magnetic performance, and aesthetic quality of the final product.

This article explores the root causes of these problems, their impact on magnet quality, and detailed solutions to mitigate them. By optimizing raw material selection, milling, pressing, sintering, and post-processing techniques, manufacturers can enhance the reliability and performance of ferrite magnets.

1. Overview of Processing Techniques for Ferrite Magnets
Ferrite magnets, also known as ceramic magnets, are widely used in various applications due to their high electrical resistivity, excellent corrosion resistance, and cost-effectiveness. The manufacturing of ferrite magnets primarily involves powder metallurgy, a process that enables precise control over the magnetic properties and physical structure of the final product. In addition to powder metallurgy, other techniques such as surface finishing and protective coating are employed to enhance the magnets' performance and durability.