Physical and mechanical properties of sintered NdFeB type permanent magnets

Effective application of the Nd---Fe---B type permanent magnets in electrotechnical products, instruments, aviation and space devices demands knowledge of their proper service parameters. In this connection, a comprehensive study of a wide spectrum of sintered Nd---Fe---B type permanent magnets with various additions of rare earth (RE) and 3-d metals (14 compositions, including so-called commercial and laboratory permanent magnets) was carried out. The mechanical (elastic and strength properties) and physical (magnetic and thermal properties, and electrical resistivity) properties of the studied magnets are tabulated, and the data are discussed. The results obtained allow selection of the optimal permanent magnet composition, depending on required properties and the application. Moreover, the results obtained for various permanent magnets are discussed, taking into account the influence of the factors which are sensitive or insensitive to structure and/or composition changes of the magnets.