Abstract: A cutting tool insert having a cemented carbide substrate and a coating including a layer of NbN, wherein the cemented carbide substrate includes 11-12.5 wt % cobalt, 0.2-1.2 wt % chromium, and 86.3-88.4 wt % wolfram carbide.

Abstract: A cutting tool insert having a cemented carbide substrate and a coating including a layer of NbN, wherein the cemented carbide substrate includes 11-12.5 wt % cobalt, 0.2-1.2 wt % chromium, and 86.3-88.4 wt % wolfram carbide.

Abstract: A fine grained cemented carbide powder mixture for cutting tool inserts for metal machining includes WC-powder with a Scott density of 2.75-3.75 g/cm3 and a compacting density after dry pressing at 100 MPa within 8.8-9.8 g/cm3. The sintering shrinkage of the fine grained cemented carbide powder mixture is 16.8 to 17.9% at a compacting pressure of 150 MPa. A method of making the powder mixture is also described.

Abstract: A method of making cemented carbide powder with low sintering shrinkage including WC and 4-15 wt-% Co and up to 20 wt-% cubic carbide forming elements from the Groups 4 and 5 of the Periodic Table of the Elements by the powder metallurgical techniques wet milling, pressing and sintering. According to the method wet milling is performed in a rotating ball mill with a ratio between the weight of milling bodies and powder of 2-5. The milling bodies are shaped either as spheres or cylinders with semi-spherical end surfaces. The spherical bodies have a diameter of 10 to 15 mm and the cylindrical bodies have a diameter and height of 10 to 15 mm. The composition of the milling bodies is WC with 6 to 10 wt-% Co. A powder made according to the method is described.

Abstract: A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.

Abstract: A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.

Abstract: A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.

Abstract: A cutting tool insert particularly useful for wet and dry milling of low and medium alloyed steels and stainless steels includes a cemented carbide body with a coating consisting of an MTCVD Ti(C,N) layer and a multi-layer coating being composed of &kgr;-Al2O3 and TiN or Ti(C,N) layers.

Abstract: A cutting tool insert has a cemented carbide substrate and a coating. The cemented carbide substrate includes 73-93 wt % WC, 4-12 wt % binder phase, and cubic carbide phase with a binder phase enriched surface zone essentially free of cubic carbide phase. The cubic carbide phase includes elements from the groups IVB and VB, with the Ta content on a level corresponding to a technical impurity. Inserts according to the invention exhibit favorable edge strength and thermal shock resistance.

Abstract: An improved method of making submicron cemented carbide bodies include wet milling powders of WC and Co and grain growth inhibitors to a slurry, drying the slurry to a powder, uniaxial pressing of the powder to form bodies of a desired shape, and sintering. WC powder is provided with an FSSS grain size, dwc, of less than 1 &mgr;m and a Co powder with an FSSS grain size, dco, such that the ratio dwc/dco is 0.75-1.5.

Abstract: The present invention relates to a sintered cemented carbide consisting of 50 to 90 wt-% submicron WC in a hardenable binder phase. The binder phase comprises, in addition to Fe, 10-60 wt-% Co, <10 wt-% Ni, 0.2-0.8 wt-% C, Cr, W, Mo and/or V in amounts satisfying the relations 2xC<xW+xCr+xMo+xV<2.5xC where x denotes mol fraction elements in the binder phase and the following relation for the total Cr content 0.03<wt-% Cr/(100-wt-% WC)<0.05 In addition, the binder phase consists of martensite with a fine dispersion, a few percent, of coherent carbides, preferably of M2C type, with a size of the order of 10 nm.