| Summary: | The dissolution behaviors of titanium nitride titanium sponges in titanium alloy melt were examined. A titanium nitride sponge was produced using nitrogen gas. The titanium nitride sponge featured a porous structure. Porous structures at both the surface layer and inside were formed at intervals of about 5.0 × 10-5 m. When the titanium nitride sponge was immersed into a titanium alloy melt, the melt permeated into the pores. The dissolution rate of the titanium nitride sponge in the titanium alloy melt depends on the temperature of the melt. Higher melt temperatures corresponded to higher dissolution rates. However, the concentration of nitrogen in the titanium nitride sponge had no influence on the dissolution rate. Dissolution model of the titanium nitride sponge into the titanium alloy melt were proposed. These models considered the structure of the sponge; thus, the behavior of the dissolution sponges was predicted and confirmed.
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