T/CSRE 6002-2024 Sintered NdFeB Permanent Magnet Alloy Powder Flowability Test Method Part 2: Determination of Angle of Repose

Scope

Main Technical Content: Flowability Test Method for Sintered Neodymium-Iron-Boron Permanent Magnet Alloy Powder Part 2: Determination of the Angle of Repose 1 Scope This document describes the method for determining the angle of repose of sintered neodymium-iron-boron permanent magnet alloy powder. It is applicable to the determination of the angle of repose of sintered neodymium-iron-boron permanent magnet alloy powder, with a particle size range of (1.5–50.0) μm. 2 Normative References The content of the following documents is an essential part of this document through normative references. Among them, the referenced documents with a specified date apply only to the version corresponding to that date; for those without a specified date, the latest version (including all amendment sheets) applies. GB/T 3500 - Powder Metallurgy - Terminology The following terms and definitions defined in GB/T 3500 apply to this document. Angle of Repose The angle between the free surface of a powder layer in a static equilibrium state and the horizontal plane, also known as the angle of rest, static angle, or natural slope angle. [Source: GB/T 3500-2008, 2.1.5] 4 Method Summary Under the protection of an inert gas, the sintered neodymium-iron-boron permanent magnet alloy powder is allowed to naturally fall onto a dedicated water platform to form a cone. The angle between the sloping surface of the cone and the horizontal plane is the angle of repose. 5 Technical Requirements Angle of Repose Determination Device The schematic diagram of the sintered neodymium-iron-boron permanent magnet alloy powder angle of repose determination device and its main components is shown in Figure 1. Any instrument that can obtain a correct angle of repose based on the principle of angle of repose can be used. Main Components Gloves Box The gloves box should be filled with an inert gas and equipped with an oxygen content testing and control system. The gas pressure is s

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