Inspection regarding the purity of raw material: Using ICP to exam elements in raw material
Using caliper to exam the semi-finished magnet thickness,100pcs for each shift. An average of 90 percentage striped chips’ dimension should fallbetween 0.25-0.35mm. The total weight loss occurs during this Process and should be controlled to less than 1.8percentage.
The microchip thickness is measured using a metallographic microscope. No α-Fe particles are expected. Any average size of 3.5-6.5μm microchips would fit the standard as being satisfactory quality category.
Monitor the oxygen level with oxygen detector with the strictest standard. Analyzing the powder particle size and distribution with laser particle size diagnose examiner to ensure the top standard of result.
This process is also known as pressing magnetizing orientation often been decided over this process. Oxygen detector is placed during the process to monitor the oxygen level inside of operating box.
This process uses a gauge to ensure the vacuum inside of sinter furnace remains at the required level. The level will vary as the temperature inside the sinter furnace changes. The figure should be less than 1Mpa after loading. It changes to 7.5×10-3Mpa when the temperature starts rising. The vacuum level indicates the functional ability of the furnace, A controlled vacuum provides better insurance of stabilized magnet quality.