| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To allow the respective properties of Bi and a hard material to be exhibited in a Cu-Bi-hard material based sintered alloy. <P>SOLUTION: In the Pb-free copper based sintered alloy, 1 to 30% Bi and 0.1 to 10% hard material particles with a mean particle diameter of 10 to 50μm are contained, and (1) a Bi phase having a mean particle diameter smaller than that of the hard material particles is dispersed into a Cu matrix, or, regarding the Bi phase in contact with the hard material particles, the abundance ratio of the hard material particles in which the contact length ratio to all the periphery of the Bi phase is≤50% is≥70% to the whole piece of the hard material particles. <P>COPYRIGHT: (C)2005,JPO&NCIPI</p> |
