| 摘要 |
<p>An alloy particle, characterized in that it contains no lead, has a plurality of melting points including an initial minimum melting point (a) and an maximum melting point, has the initial minimum melting point (a) al least in a surface portion, and exhibits an elevated minimum melting point (a') higher than the initial minimum melting point (a) after it is heated to a temperature of the initial minimum melting point (a) or higher to melt it at least at the surface portion and then is cooled to room temperature to thereby solidify the molten portion.</p> |
