| 摘要 |
PURPOSE:To improve magnetic characteristics and to obviate the generation of voids in a joint part by pressing a winding groove side of a C core and are I core, forming a gap part by nonmagnetic ceramics and assembling the joint part of the opposite side thereof by making direct solid phase diffusion joining. CONSTITUTION:Thin nonmagnetic ceramic films 4b consisting of barium titanate or calcium titanate are formed by, for example, a sputtering vapor deposition method, etc., on the surfaces to form the gap part 4 of the C core 2a and I core 2b consisting of a magnetic material. On the other hand, the joint surface on the opposite side of the gap 4 is held intact. The C core 2a and I core 2b are pressed to each other and while pressing force (f) is exerted to the cores in an arrow direction, the cores are subjected to a heat treatment to hold the same for 4 hours at about 1,050 deg.C. The joint part 4a of the C core 1a and the I core 1b forms a cross-diffused layer by the direct solid phase reaction and is welded near the gap 4 to reinforce said part by inserting and melting a glass 5 in a winding grove part 2c. |
