Gradient Volatilization Organic Slurry for Neodymium Iron Boron Magnet Printing
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Solution Overview
Problem
Existing screen printing technologies for neodymium iron boron magnets face challenges with slurry volatilization rates, where fast room temperature volatilization leads to printing issues and slow high temperature volatilization results in uneven film layers and prolonged drying times, affecting diffusion efficiency.
Innovation Solution
An organic slurry with a gradient volatilization rate is developed, comprising rare earth powders, organic solvents, resins, dispersants, anti-settling agents, and synergists, optimized in weight percentages and composition to achieve a controlled volatilization profile, including a low room temperature volatilization rate and high temperature volatilization rate, ensuring stable printing and efficient drying.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If the organic solvent volatilization rate is increased at room temperature, then the drying speed is improved, but the slurry viscosity increases and printing becomes difficult
Solution Approach 1:
The patent applies parameter changes by selecting organic solvents with specific boiling point ranges (60-120°C) and controlling their content (10-30 wt%). This optimization of physical parameters enables the slurry to achieve appropriate volatilization rate at room temperature without causing excessive viscosity increase, thus resolving the contradiction between drying speed and printing ease.
2Manufacturing precision
If the organic solvent volatilization rate is decreased at high temperature, then the film layer uniformity is improved, but the drying time is prolonged
Solution Approach 1:
The patent optimizes the boiling point parameter of organic solvents to be within 60-120°C, which ensures that at high temperatures the solvents volatilize at a controlled rate. This prevents film layer flow and maintains uniformity while achieving efficient drying, thus resolving the contradiction between film layer uniformity and drying time.
Solution Approach 2:
The patent uses composite organic solvent systems comprising multiple solvents with different boiling points within the 60-120°C range. This composite approach allows for graduated volatilization during drying, maintaining film uniformity while achieving appropriate drying speed through synergistic effects of different solvent components.
3Ease of operation
If the organic solvent content is increased, then the slurry fluidity is improved, but the room temperature volatilization rate increases causing printing defects
Solution Approach 1:
The patent optimizes the organic solvent content parameter to be within 10-30 wt% of the total slurry composition. This controlled concentration ensures sufficient fluidity for screen printing while limiting the amount of solvent available for volatilization during the printing process, thus preventing printing defects caused by excessive volatilization.
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 slurry achieves a controlled volatilization rate, preventing printing defects, shortening drying times, and reducing impurity incorporation during heat treatment, thereby enhancing processing efficiency and maintaining magnetic properties.
Implementation Method 1
the organic carrier forms a reticular structure by constructing gradients of organic ingredients and by virtue of strong interaction of grinding, thereby ensuring that the room temperature volatilization rate is less than 0.05%/h and the high temperature volatilization rate is greater than 1.2%/h at 120° C.
Data Source
AI summary
Disclosed are an organic slurry with a gradient volatilization rate and a preparation method. The organic slurry includes a rare earth powder, an organic solvent, a resin, a dispersant, and/or an anti-settling agent, and/or a synergist, weight percentages of which are as follows: rare earth powder 50%-90%; organic solvent 8%-50%; resin 0.4%-6%; dispersant 0%-5%; anti-settling agent 0%-3%; and synergist 0%-3%. The preparation method includes: weighing the rare earth powder, organic solvent, resin, dispersant, and/or anti-settling agent, and/or synergist by weight percentage; sequentially adding the weighed ingredients into a mixer, stirring at a constant temperature, and then cooling to room temperature to obtain an organic carrier; adding the organic carrier and the weighed rare earth powder into a vacuum high-speed disperser to obtain a crude organic slurry; and transferring the crude organic slurry to a gap adjustable three-roll grinder for grinding to obtain a fine organic slurry.