Importance

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Abstract

Evaluation results are shown in Table 1. The embodiments 1-9 possess a high thermal conductivity and high bonding strength. However, the thermal conductivity has dropped in the comparative examples 1, 2 and 4 with a low surface area ratio and in the comparative example 3 with a high surface area ratio. The comparative example 2 with a low projection height has a low bonding strength, and the comparative example 3 with a high projection height has a drop in the thermal conductivity. The thermal conductivity has declined in the comparative example 1 with relatively few projections, and the thermal conductivity has declined in the comparative example 4 with many projections. The comparative example 5 with no projections and having a rough casting surface does not have sufficient bonding strength.

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First Claim