| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a technique for improving sintering density while fully receiving the effect of carbon addition. <P>SOLUTION: The method is provided with: a molding process of molding a mixture containing raw material powder, carbon powder and a polyhydric alcohol expressed by the general formula: C<SB>x</SB>(OH)<SB>y</SB>H<SB>z</SB>(wherein 4≤x≤100, 2≤y≤x, 4≤z≤2x); and a sintering process of obtaining a sintered compact by sintering the resulting molding. The polyhydric alcohol suppresses the segregation of the carbon powder and therefore, even if the carbon powder disappears during the sintering, an increase of pinholes and the decrease in the sintering density due to the same can be suppressed. According to the method, the segregation of the carbon powder can be suppressed and the sintered oxide compact of high density can be obtained while the effect by the carbon addition is fully received. A W type ferrite magnet of a high residual magnetic flux density (Br) can be obtained by applying the method to the W type ferrite magnet. <P>COPYRIGHT: (C)2005,JPO&NCIPI |
