| 摘要 |
Ultra-hard constructions (10) comprise a polycrystalline diamond-body (12, a first metallic substrate (14) attached thereto, and a second metallic substrate (16) attached to the first metallic substrate (14). The first and second substrates (14, 16) each comprise a first hard particle phase and a second binder material phase, where the hard particles in the second substrate (16) are sized larger than those in the first substrate (14). The first substrate (14) may contain a greater amount of binder material than the second substrate (16). The first substrate (14) facilitates sintering the diamond body (12) during HPHT conditions, and the second substrate (16) provides an improved degree of erosion resistance when placed in an end-use application. The construction may be formed during a single HPHT process. The second substrate (16) may comprise 80 percent or more of the combined thickness of the first and second substrates (14, 16). |
