公开(公告)号：US20080302576A1

公开(公告)日：2008-12-11

申请号：US12192292

申请日：2008-08-15

申请人： Prakash K. Mirchandani ,  Jimmy W. Eason ,  James J. Oakes ,  James C. Westhoff ,  Gabriel B. Collins

发明人： Prakash K. Mirchandani ,  Jimmy W. Eason ,  James J. Oakes ,  James C. Westhoff ,  Gabriel B. Collins

IPC分类号： E21B10/00

CPC分类号： E21B10/46 ,  B22F2005/001 ,  B22F2998/00 ,  C22C1/1068 ,  C22C29/00 ,  C22C29/005 ,  C22C29/067 ,  B22F7/06

摘要： The present invention relates to compositions and methods for forming a bit body for an earth-boring bit. The bit body may comprise hard particles, wherein the hard particles comprise at least one carbide, nitride, boride, and oxide and solid solutions thereof, and a binder binding together the hard particles. The binder may comprise at least one metal selected from cobalt, nickel, and iron, and at least one melting point-reducing constituent selected from a transition metal carbide in the range of 30 to 60 weight percent, boron up to 10 weight percent, silicon up to 20 weight percent, chromium up to 20 weight percent, and manganese up to 25 weight percent, wherein the weight percentages are based on the total weight of the binder. In addition, the hard particles may comprise at least one of (i) cast carbide (WC+W2C) particles, (ii) transition metal carbide particles selected from the carbides of titanium, chromium, vanadium, zirconium, hafnium, tantalum, molybdenum, niobium, and tungsten, and (iii) sintered cemented carbide particles.

摘要翻译： 本发明涉及用于形成钻头的钻头体的组合物和方法。 钻头体可以包括硬质颗粒，其中硬颗粒包含至少一种碳化物，氮化物，硼化物及其氧化物和固体溶液，以及将硬颗粒结合在一起的粘合剂。 粘合剂可以包含选自钴，镍和铁中的至少一种金属，以及至少一种选自30-60重量％范围的过渡金属碳化物，至多10重量％的熔点降低成分，硅， 至多20重量％，最高达20重量％的铬，和至多25重量％的锰，其中重量百分数是基于粘合剂的总重量。 此外，硬颗粒可以包括（i）碳化钨（WC + W2C）颗粒，（ii）过渡金属碳化物颗粒中的至少一种，其选自钛，铬，钒，锆，铪，钽，钼， 铌和钨，和（iii）烧结的硬质合金颗粒。