AlNiCo Hard Magnetic Particles With Low Co for Security Ink Detection
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Solution Overview
Problem
Existing AlNiCo-based magnetic materials for security ink require high Co content to achieve suitable coercive force and residual magnetization, which is economically inefficient and can lead to detection issues due to excessive Co content or insufficient residual magnetization.
Innovation Solution
Development of an AlNiCo-based hard magnetic particle with a Co content of 17% or less, achieving a residual magnetization/coercive force ratio of 0.06 or more, and suitable coercive force range of 250 Oe to 450 Oe, along with a method involving molten metal production, atomization, classification, and heat treatment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If Co content is increased to improve coercive force and residual magnetization, then magnetic properties are improved, but manufacturing cost increases due to expensive Co material
Solution Approach 1:
The patent changes the compositional parameters by reducing Co content from conventional high levels to 17% or less, while simultaneously adjusting Al, Ni, Cu, and Ti content ratios to compensate and maintain magnetic properties within the suitable range for security ink detection
Solution Approach 2:
The patent creates a composite alloy system where multiple elements (Al, Ni, Co, Cu, Ti, Fe) work synergistically to achieve the desired magnetic properties with reduced Co content, rather than relying on high Co content alone
2Quantity of substance
If Co content is reduced to lower manufacturing cost, then economic competitiveness is improved, but magnetic properties deteriorate and may become unsuitable for security ink detection
Solution Approach 1:
The patent systematically adjusts multiple compositional parameters (Al: 2-10%, Ni: 15-30%, Co: 17% or less, Cu: 1-5%, Ti: 1-5%) to find the optimal balance that maintains magnetic properties while reducing Co content
Solution Approach 2:
The patent optimizes the local composition ratios of specific elements around the Co component, using Al, Ni, Cu, and Ti in specific proportions to locally compensate for reduced Co and maintain the required magnetic property range
3Reliability
If coercive force is increased to improve residual magnetization, then detection sensitivity is improved, but it becomes difficult to magnetize the material with existing permanent magnets
Solution Approach 1:
The patent optimizes the coercive force parameter to fall within 250-450 Oe, which is a specific range that balances sufficient residual magnetization with the capability to be magnetized by conventional permanent magnets used in security detection devices
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
The solution provides AlNiCo-based hard magnetic particles with reduced Co content while maintaining effective magnetic properties suitable for security ink detection, enhancing economic competitiveness and detection sensitivity.
Implementation Method 1
manufacturing method involving molten metal production, atomization, classification, and heat treatment
Implementation Method 2
heat-treating the selected particles in an inert gas atmosphere
Data Source
AI summary
Disclosed is an AlNiCo-based hard magnetic particle containing Al, Ni, Co, Cu, Ti, and the balance of Fe. The AlNiCo-based hard magnetic particle contains Co in an amount of 10 to 17 wt %, has a coercive force of 250-450 Oe, and has a residual magnetization/coercive force rate of 0.06 or more. The AlNiCo-based hard magnetic particle according to the present invention can advantageously guarantee magnetic properties suitable for being detected by a magnetic reluctance device due to a low content of Co.