Preparation of Plate-type Permanent Magnets by Electrically Heated Powder Rolling

Abstract

Production of magnets by electrically heated powder rolling can potentially solve problems such as the difficulty of mass production by conventional sintering using a die upset. The purpose of this study is to investigate whether plate-shaped Nd-Fe-B magnets can be produced by electrically heated powder rolling, which is a method that has not been applied to magnets. The possibility of producing plate-type magnets through electrically heated powder rolling was determined by evaluating whether densification can be achieved, considering the rolling parameters such as the rolling load, current, and number of rolling passes. The magnet was densified in the case of the lower load and the higher current. Although density was higher with 5 passes than 1 pass, the density change was less dramatic than in the other two parameters. As a result, it was proven that the electrically heated powder rolling method has the potential to produce plate-shaped magnets.