| 摘要 |
The composite construction of the present invention comprises a continuous core material 4 made of a polycrystalline diamond (PCD) obtained by bonding diamond particles 2, 2 with an iron group metal 3; and a shell layer 8 made of a sintered body obtained by bonding hard particles 6 with an iron group metal 7; wherein an amount of the iron group metal 3 in the core material 4 is larger than that of the iron group metal 7 in the shell layer 8.
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