The Effect of Carbon Addition on the Magnetic Shunt Properties of M.S.O. Alloy

Abstract

The magnetic shunt properties of one kind of M.S.O. Alloy (31%Ni, 8.5%Cr and res. Fe) containing C from 0.019 to 0.150% were studied. The magnetization curves at 0° to 40°C were measured by the ballistic method. The dimension of specimen was 0.4 cm in diameter, 3.1 cm in length, and so the demagnetization factor N was 0.30. The experimental results on magnetic shunt properties are summarised as follows: (1) With increasing C addition, the permeability decreases at first and then increases slightly through a feeble minimum. It is assumed that the former decreasing is due to the impurity of C and the latter increasing due to the formation of Fe₆Cr₁₇C₆ which is speculated by the microscopic texture and the calculation. (2) The temperature coefficient of permeability becomes larger with increasing C addition, and its linearity becomes worse.