| 摘要 |
PROBLEM TO BE SOLVED: To provide the damping material having high strength and the production method of the material. SOLUTION: In this production, a porous silicon nitride sintered compact consisting of silicon nitride prismatic crystals which have <=1μm average minor axis and each of which has an aspect ratio of >=5, is filled with an aluminum- zinc based damping alloy. That is, the production of this damping material comprises: adding 5 to 15wt.% of a sintering aid to powdery silicon nitride having a <=1μm average particle size; forming the resulting mixture into a formed body having a prescribed shape; heating this formed body at 1550 to 1800 deg.C in an inert atmosphere to form a porous silicon nitride sintered compact that has 30 to 70vol.% open porosity and consists of silicon nitride prismatic crystal grains which have <=1μm average minor axis and each of which has an aspect ratio of >=5; and then, filling the open pores of the sintered body with a melt of an aluminum-zinc based damping alloy to produce the objective damping material.
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