摘要:
Metal carbide supported polycrystalline diamond (PCD) compacts having improved shear strength and impact resistance properties, and a method for making the same under high temperature/high pressure (HT/HP) processing conditions. A sintered polycrystalline cubic boron nitride (PCBN) compact interlayer is provided to be bonded at a first interface to a sintered PCD compact layer, and at a second interface to a cemented metal carbide support layer comprising particles of a metal carbide in a binder metal. The supported compact is characterized as having a substantially uniform sweep through of the binder metal from the cemented metal carbide support layer, which sweep through bonds the sintered PCD compact layer to the sintered PCBN interlayer, and the sintered PCBN interlayer to the cemented metal carbide support layer.
摘要:
The invention provides a sintered body for high-hardness tools which, when used for cutting work of cast irons where the cutting edge undergoes high temperature and abrupt impact, holds high chip-off and abrasion resistances and exhibits good cutting performance. The sintered body for high-hardness tools is obtained by sintering 60 to 75% by volume of cubic boron nitride powder and remaining part of a binder powder under a superhigh pressure, the binder comprising 5 to 15% by weight of Al, and the remaining part comprising a compound represented by (Hf.sub.X Ti.sub.y M.sub.1-x-y)(C.sub.Z N.sub.1-z).sub..alpha. (where M denotes an element belonging to IVa, Va or VIa group in the periodic table except Ti and Hf, and where 0.1.ltoreq.x.ltoreq.0.5, 0.5.ltoreq.y.ltoreq.0.9, 0.7.ltoreq.z.ltoreq.0.9, and 0.6.ltoreq..alpha..ltoreq.0.8) or a mixture of a plurality of compounds that totally results in the aforementioned composition.
摘要翻译:本发明提供一种用于高硬度工具的烧结体,当用于切割边缘经受高温和突然冲击的铸铁的切割工作时,其具有高的切屑和耐磨性,并且具有良好的切削性能。 用于高硬度工具的烧结体通过在超高压下烧结60至75体积%的立方氮化硼粉末和剩余部分粘合剂粉末而获得,粘合剂包含5至15重量%的Al,剩余的 部分包括由(HfX y y 1-xy)(CZN 1-z)α表示的化合物(其中M表示除了Ti和Hf之外的元素周期表中属于IVa,Va或VIa基团的元素,其中0.1 < 0.5,0.5≤y≤0.9,0.7≤z≤0.9,0.6≤α≤0.8)或多个化合物的混合物,其总体上导致上述组成。
摘要:
Broadly, the present invention is directed to a method for making a thermally stable, dense, electrically conductive diamond compact. The method comprises infiltrating a mass of diamond crystals with a silicon infiltrant in the presence of boron under conditions comprising a temperature of not substantially above 1200 .degree. C. and a pressure of not substantially above 45 Kbars. The resulting compact contains diamond-to-diamond bonding. The boron can be provided in the form of boron-doped diamond. Alternatively, a boron-silicon alloy can be used for infiltrating boron-doped or undoped diamond. Further, boron can be added as elemental boron or B.sub.4 C with silicon for infiltration. Alternatively, boron metal catalyst plus silicon infiltration can be used for boron-doped or undoped diamond. Combinations of these techniques also can be used. In the HP/HT process, the silicon infiltrates the diamond powder mass forming a network composed of silicon carbide by reaction of the silicon with diamond-carbon. The reaction leaves a sintered body composed of boron-doped diamond or boron compounds with diamond or a network of silicon carbide and silicon.
摘要:
A sintered body for high-accuracy working tools is obtained by sintering powder mixture containing at least 45 percent by volume and not more than 60 percent by volume of cubic boron nitride powder having an average particle size of not more than 2 .mu.m and having a remainder formed of binder powder under a superhigh pressure. The binder contains at least 5 percent by weight and not more than 15 percent by weight of Al and at least 2 percent by weight and not more than 20 percent by weight of W, and has a binder remainder formed of a Ti compound or compounds. The atomic ratio of Ti contained in the binder to a transition metal element or elements belonging to any of the groups IVa, Va and/or VIa of the periodic table including Ti is at least 2/3 and not more than 97/100. In the structure of the sintered body, cubic boron nitride crystals are bonded with each other through bonding phases formed by the binder. When at least one or more Ti compounds are selected from a group of TiN.sub.z, Ti(C.sub.1-x N.sub.x).sub.z, (Ti,M) (C.sub.1-x N.sub.x ).sub.z and (Ti,M)N.sub.z, where M represents transition metal element or elements belonging to any of the groups IVa, Va and/or VIa of the periodic table excluding wherein z is within the range 0.45.ltoreq.z.ltoreq.0.65 and x is within the range of 0.50.ltoreq.x
摘要:
A sintered compact is obtained by sintering a mixture containing about 50 to 75 percent by volume of cubic boron nitride and about 25 to 50 percent of a binder under cBN-stable superhigh pressure conditions. The binder contains about 20 to 50 percent by weight of Al and one or more Ti compounds selected from the group consisting of TiN.sub.z, Ti(C,N).sub.z, TiC.sub.2, (Ti,M)C.sub.z, (Ti,M) (C,N).sub.z and (Ti,M)N.sub.z, wherein M indicates a transition metal of the group IVa, Va or VIa of the periodic table excepting Ti, and wherein z is within a range of 0.5.ltoreq.z.ltoreq.0.85. The atomic ratio of the content of Ti to that of the transition metal M in the binder is within the range of about2/1.ltoreq.Ti/M.ltoreq.97/3.The binder further contains tungsten or one or more tungsten compounds, whereby the total tungsten concentration in the binder is about 4 to 40 percent by weight.
摘要翻译:通过在cBN稳定的超高压条件下烧结含有约50至75体积%的立方氮化硼和约25至50%的粘合剂的混合物来获得烧结体。 所述粘合剂含有约20〜50重量%的Al和选自TiNz,Ti(C,N)z,TiC 2,(Ti,M)Cz,(Ti,M)(C ,N)z和(Ti,M)Nz,其中M表示除了Ti之外的元素周期表的基团IVa,Va或VIa的过渡金属,并且其中z在0.5≤z≤0.85的范围内 。 粘合剂中Ti与过渡金属M含量的原子比在约2/1 Ti / M = 97/3的范围内。 粘合剂还含有钨或一种或多种钨化合物,由此粘合剂中的总钨浓度为约4-40重量%。
摘要:
A process for producing a diamond compact having a compressive strength of at least 10 kbars, the process being performed in the graphite stability field at a maximum pressure of 40 kbars at a temperature of between 1100.degree. C. and 1600.degree. C. for a time which permits plastic deformation of the diamond crystals giving face-to-face contacts there-between and a substantial or complete degree of chemical equilibration between the bonding agent and the diamond crystals. Bonding agents are selected from elements and alloys which produce a bond with diamond having a melting point above 1600.degree. C. and which inhibit the formation of free graphite in the compact.
摘要:
Herein is disclosed a high hardness sintered diamond compact and a process for the production of the same.The high hardness sintered diamond compact comprises 80 to 95% by volume of diamond particles, 0.5 to 5% by volume of a carbide particles selected from a group consisting of WC and (Mo,W)C and having a diameter not larger than 1 micron, and 4.5 to 15% by volume of an iron group metal, at least 95% by volume of said diamond particles having a diameter from 0.1 to 2 micron and the remainder of the diamond particles being particles having a diameter smaller than 0.1 micron.The ratio by volume of the amount of the diamond particles having a diameter from 1 to 2 micron to that of the diamond particles having a diameter from 0.1 to 1 micron ranges from 4 to 1.The high hardness sintered diamond compact according to the present invention is preferably usable as a drawing die for drawing a high hardness plated-steel wire and as a tool bit.The process according to the invention, comprises the steps of:preparing a diamond powder having a particle diameter distribution from 0.2 to 2 micron;mixing the diamond powder with an iron group metal and one member selected from the group consisting of WC and (Mo,W)C powders each having a particle diameter not larger than 1 micron;hot-pressing the thus obtained mixture of powders at an ultra-high pressure and a high temperature where diamond may be stable.
摘要:
Abrasive compacts are described which comprise a support mass having abrasive masses bonded to each of the upper and lower surfaces of said support mass. Preferably, the abrasive masses are diamond or cubic boron nitride and the support mass is a sintered carbide. Bonding of the abrasive masses to the support mass preferably is accomplished by a high pressure, high temperature process.
摘要:
A sintered compact of cubic boron nitride is made by adsorbing and/or diffusing 0.005 to 1.000 percent by weight of water into a boron nitride compact containing alkaline earth metal boron nitride as a catalyst. The so prepared compact is then subjected to a treatment under high pressure at a relatively low temperature to form a dense cubic boron nitride sintered compact of high purity.
摘要:
A diamond sintered body for tools contains a diamond content in excess of 93 percent and not more than 99 percent by volume and a residue including at least one of a metal or a carbide selected from groups IVa, Va and VIa of the periodic table and an iron group metal of 0.1 to 3 percent by volume in total and pores at least 0.5 percent and not more than 7 percent by volume.