摘要:
The present invention relates to a process for the production of fiber- reinforced composite materials with an ultra-refractory, high tenacity, high ablation resistant matrix with self-healing properties, prepared from highly sinterable slurries. The composite material is produced using techniques of infiltration and drying at ambient pressure or under vacuum, and consolidated by sintering with or without the application of gas or mechanical pressure.
摘要:
A ceramic sintered body containing aluminum oxide, tungsten carbide and zirconium oxide, wherein: the zirconium oxide contains ZrO and ZrO 2 ; the ZrO 2 has a crystal structure or structures of one or two kinds selected from the group consisting of a tetragonal crystal structure and a cubic crystal structure; and when, in X-ray diffraction, regarding a peak intensity for a (111) plane of the ZrO as being denoted by I 1 , regarding a peak intensity for a (101) plane of ZrO 2 having a tetragonal crystal structure as being denoted by I 2t , and also regarding a peak intensity for a (111) plane of ZrO 2 having a cubic crystal structure as being denoted by I 2c , a ratio of I 1 based on a total of I 1 , I 2t and I 2c [I 1 /(I 1 +I 2t +I 2c )] is from 0.05 or more to 0.90 or less.
摘要:
Disclosed are a solid-solution powder, a method for preparing the solid-solution powder, a ceramic using the solid-solution powder, a method for preparing the ceramic, a cermet powder including the solid-solution powder, a method for preparing the cermet powder, a cermet using the cermet powder and a method for preparing the cermet. According to the present invention, the problem of low toughness due to high hardness that conventional cermets (especially TiC or Ti(CN) based cermet) have is resolved because a complete solid-solution phase without core/rim structure can be obtained as a microstructure, and wherein further increased the hardness as well as the toughness, thereby substantially and considerably increasing general mechanical properties of materials using the ceramic or the cermet and thus substituting WC-Co hard material and allowing manufacturing of cutting tools with high hardness and toughness, and wherein the complete solid-solution phase without core/rim structure can be obtained even in the reducing and carburizing condition of low temperature of 1300 °C or less and relatively short time, thereby increasing an efficiency of the overall process.
摘要:
To provide a sintered material having excellent oxidation resistance, as well as excellent abrasion resistance and chipping resistance. A sintered material containing a first compound formed of Ti, Al, Si, O, and N is provided.
摘要:
There is provided a surface-coated sintered body formed of a sintered body of cubic boron nitride with a sufficiently adhesive surface coating layer thereon. The present surface-coated sintered body includes a sintered body of cubic boron nitride and a surface coating layer formed on a surface thereof, the sintered body of cubic boron nitride including 20-99.5% by volume of cubic boron nitride and a binder, the surface coating layer including an adhesion layer and at least one hard coating layer, the adhesion layer being a metal layer including at least W, and being formed to cover a surface of the sintered body of cubic boron nitride, the hard coating layer being formed to coat the adhesion layer, the adhesion layer being configured of an amorphous state and/or ultrafine particles having an average particle size equal to or smaller than 5 nm.
摘要:
The present invention provides a cubic boron nitride sintered body, which achieves both of superior chipping resistance and wear resistance. In accordance with a first aspect of the present invention, a cubic boron nitride (cBN) sintered body contains cubic boron nitride particles and a bonding material used for bonding the cBN particles to one another. This sintered body is constituted by cBN particles in a range from 70 vol% to 98 vol% and a residual bonding material made from a Co compound, an Al compound and WC and a solid solution of these. Moreover, the cBN particles in the sintered body contain 0.03 wt% or less of Mg and 0.001 wt% or more to 0.05 wt% or less of Li. In accordance with a second aspect of the present invention, the cubic boron nitride sintered body has a composition in which the bonding material of the first aspect is changed to an Al compound.
摘要:
Multi-step milling processes to prepare cBN composite powder forms a first powder mixture by adding a binder and a first cBN component, mills the first powder mixture for a first time period, combines a second cBN component with the milled first powder mixture to form a second powder mixture, and mills the second powder mixture for a second time period (less than the first time period) to form the cBN composite powder. A ratio of the D50 value of the second cBN component to the D50 value of the first cBN component is at least 3.0. Two-step milling with different milling times for the two cBN component fractions controls the amount of mill debris in the cBN composite powder mixture. Further processing of the cBN composite powder under HPHT conditions forms a cBN-based ceramic with an average value of a cBN particle free diameter of less than 2.0 microns.
摘要:
A cubic boron nitride sintered body tool (1) of the present invention, in which a cubic boron nitride sintered body (2) is joined to a tool base material (4) via a joining layer (3), has the following feature. The cubic boron nitride sintered body (2) contains cubic boron nitride particles by not less than 30 volume % and not more than 95 volume %, and a binder phase (6) by not less than 5 volume % and not more than 70 volume %. In at least one cross sectional surface of the cubic boron nitride sintered body tool (1) taken along a plane perpendicular to a joining surface having the largest area in joining surfaces between the cubic boron nitride sintered body (2) and the joining layer (3), a point C and a point D are assumed to represent points away by 1/4 of the length of a line segment connecting a point A and a point B shown in a figure. A value obtained when an area of a region surrounded by a line segment connecting the point C and the point D, the first cubic boron nitride particle (7), the second cubic boron nitride particle (8), and the binder phase (6) is divided by the length of the line segment connecting the point A and point B to each other is not less than 0.14 µm and not more than 0.6 µm.