T/CSRE 6003-2024 Sintered NdFeB Permanent Magnet Alloy Powder Flowability Test Method Part 3: Determination of Crash Angle

Scope

Main Technical Content: Test Method for the Fluidity of Sintered Neodymium-Iron-Boron Permanent Magnet Alloy Powder - Part 3: Determination of the Collapse Angle 1 Scope This document describes the method for determining the collapse angle of sintered neodymium-iron-boron permanent magnet alloy powder. It is applicable to the determination of the collapse angle of sintered neodymium-iron-boron permanent magnet alloy powder, with a particle size range of (1.5~50.0) μm. 2 Normative References There are no normative references for this document. 3 Terms and Definitions There are no terms or definitions requiring definition in this document. 4 Method Outline Under the protection of inert gas, by applying a specific vibration method, the sintered neodymium-iron-boron permanent magnet alloy powder is allowed to naturally fall onto a dedicated water platform to form a cone. Three identical impact operations are then applied to the cone to determine the inclination of the collapse surface, which represents the collapse angle of the powder. The collapse angle measured by this standard is obtained by applying three identical impact operations to the powder's angle of repose. 5 Technical Requirements Collapse Angle Determination Device The schematic diagram of the sintered neodymium-iron-boron permanent magnet alloy powder collapse angle determination device and its main components are shown in Figure 1. Any instrument capable of obtaining a correct collapse angle based on the principle of collapse angle can be used. **Main Components:** - Glove Box: The glove box should be filled with inert gas and equipped with an oxygen content testing and control system. The gas pressure is set at (100~400) Pa, and the temperature is (20~23) °C. The glove box should have a transition chamber for material transfer. - Baffle Box: The baffle box is used to place the measurement system and protect it from external airflow. It should be easy to open or close. - Con

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