EROSION RESISTANT SUBTERRANEAN DRILL BITS HAVING INFILTRATED METAL MATRIX BODIES

摘要

Subterranean drill bits (50) having good erosion resistance, strength, toughness, and thermal stability are disclosed. The drill bits (50) comprise a bit body (54) carrying at least one cutting element (56) and having an infiltrated metal matrix (58). The infiltrated metal matrix (58) comprises a matrix powder composition (22) bound together by an infiltrant (26). The matrix powder mixture (22) includes a first component powder (60) having a particle size of -30 (600 micron) +140 mesh (106 micron), a second component powder (62) consisting of one or more other types of tungsten carbide particles, and a metal powder.