Abstract: The present disclosure relates to polycrystalline cubic boron nitride (PCBN) with enhanced impact-resistance and wear-resistance and a method for producing the PCBN. According to the present disclosure, producing the polycrystalline cubic boron nitride with one or more kinds of protrusion-shaped borides formed on the cubic boron nitride surface may inhibits the development of cracks along the surfaces of the cubic boron nitride particles and binders, thereby to improve the impact-resistance and wear-resistance. In this way, the life-span of the machining tools may be enhanced. Further, the polycrystalline cubic boron nitride may have at least one kind of a compound composed of at least two selected from the group consisting of BN, Ti, W, Co, Zr, and Si as formed during sintering. This may allow the PCBN to have high bonding strength between the cubic boron nitride and the binder.

Abstract: The present invention relates to a polycrystalline diamond compact. A method for manufacturing a polycrystalline diamond compact includes: preparing primary sintering by mixing and assembling first diamond particles and metal binder particles; sintering the mixed and assembled particles; leaching the upper surface of the sintered polycrystalline diamond compact; preparing secondary sintering by mixing second diamond particles and the metal binder particles and assembling the mixed particles on the upper surface of the primarily sintered polycrystalline diamond compact; sintering the sintered polycrystalline diamond compact and the mixed particles of the upper part; and a grinding step of grinding the reassembled second diamond particles and metal binder particles so as to remove the same.

Abstract: The present disclosure relates to polycrystalline cubic boron nitride (PCBN) with improved fracturing-resistance and wear-resistance. The polycrystalline cubic boron nitride is prepared using CBN particles of different particle sizes. In this way, the bonding force was increased by heat treatment of the second group CBN particles and binder. At the same time, improvements of the dispersion of the CBN particles of the first and second groups and the bonding force between the binder and cubic boron nitrides were achieved at the same time. Thus, the wear-resistance and fracturing-resistance of the PCBN can be effectively improved. Further, according to the present disclosure, preparing the polycrystalline cubic boron nitride by regulating the volume ratio between the charged CBN particles may allow the wear-resistance and fracturing-resistance of the PCBN to be improved. Thus, the machining tools with excellent lifetime can be manufactured using the PCBN.

Abstract: The present disclosure relates to polycrystalline cubic boron nitride (PCBN) with enhanced impact-resistance and wear-resistance and a method for producing the PCBN. According to the present disclosure, producing the polycrystalline cubic boron nitride with one or more kinds of protrusion-shaped borides formed on the cubic boron nitride surface may inhibits the development of cracks along the surfaces of the cubic boron nitride particles and binders, thereby to improve the impact-resistance and wear-resistance. In this way, the life-span of the machining tools may be enhanced. Further, the polycrystalline cubic boron nitride may have at least one kind of a compound composed of at least two selected from the group consisting of BN, Ti, W, Co, Zr, and Si as formed during sintering. This may allow the PCBN to have high bonding strength between the cubic boron nitride and the binder.

Abstract: The present invention relates to a polycrystalline diamond compact having multiple polycrystalline diamond sintered bodies and a method for producing the polycrystalline diamond compact. The method for producing the polycrystalline diamond includes: preparing first diamond powder; producing a first polycrystalline diamond sintered body having a diameter smaller than the diameter of a cemented substrate by sintering the first diamond powder under 5 to 6 GPa pressure and 1300 to 1500° C. temperature; positioning the first polycrystalline diamond sintered body in the center of the cemented substrate, and granulating second diamond powder around the first polycrystalline diamond sintered body; and sintering the second diamond powder under 5 to 6 GPa pressure and 1300 to 1500° C. temperature to form a second polycrystalline diamond sintered body. The polycrystalline diamond sintered body has uniform sintered characteristics at the center and outer edges thereof.

Abstract: Disclosed are a composite sintered body for a cutting tool and a cutting tool using the same. The composite sintered body for a cutting tool has enhanced heat conductivity and electrical conductivity to be strong against abrasion by heat and impact and to be capable of minimizing an influence on an edge during an Electrical Discharge Machine (EDM) operation.

Abstract: A cutting tool insert is disclosed. The disclosed cutting tool insert comprises: a supporting substrate extending in a first direction; and a cutting layer coupled to one surface of the supporting substrate and supported by the supporting substrate, wherein the one surface of the supporting substrate has an uplift part, which is uplifted in the first direction. The present invention can reduce a residual stress generated in a polycrystalline diamond compact.

Abstract: The present invention relates to a polycrystalline diamond compact having multiple polycrystalline diamond sintered bodies and a method for producing the polycrystalline diamond compact. The method for producing the polycrystalline diamond includes: preparing first diamond powder; producing a first polycrystalline diamond sintered body having a diameter smaller than the diameter of a cemented substrate by sintering the first diamond powder under 5 to 6 GPa pressure and 1300 to 1500° C. temperature; positioning the first polycrystalline diamond sintered body in the center of the cemented substrate, and granulating second diamond powder around the first polycrystalline diamond sintered body; and sintering the second diamond powder under 5 to 6 GPa pressure and 1300 to 1500° C. temperature to form a second polycrystalline diamond sintered body. The polycrystalline diamond sintered body has uniform sintered characteristics at the center and outer edges thereof.

Abstract: The present invention relates to a polycrystalline diamond compact. A method for manufacturing a polycrystalline diamond compact includes: assembling a first diamond powder on a carbide substrate; preliminarily sintering the assembled carbide substrate and the first diamond powder on the carbide substrate to form a first polycrystalline diamond layer on the carbide substrate; assembling a second diamond powder having a particle diameter in the range of 0.1 ?m to 5 ?m on the first polycrystalline diamond layer; and sintering the assembled carbide substrate, the first polycrystalline diamond layer, and the second diamond powder on the first polycrystalline diamond layer to form a second polycrystalline diamond layer on the first polycrystalline diamond layer. The content of a metal binder (catalyst) in a portion which is used in bedrock cutting during actual drilling, that is, a superficial portion of the polycrystalline diamond layer, is controlled to be minimized.

Abstract: The present invention relates to a polycrystalline diamond compact. A method for manufacturing a polycrystalline diamond compact includes: preparing primary sintering by mixing and assembling first diamond particles and metal binder particles; sintering the mixed and assembled particles; leaching the upper surface of the sintered polycrystalline diamond compact; preparing secondary sintering by mixing second diamond particles and the metal binder particles and assembling the mixed particles on the upper surface of the primarily sintered polycrystalline diamond compact; sintering the sintered polycrystalline diamond compact and the mixed particles of the upper part; and a grinding step of grinding the reassembled second diamond particles and metal binder particles so as to remove the same.

Abstract: A diamond particle is provided, which includes a coating layer including Cr (chromium) of about 1˜6%, Al (aluminum) of about 3˜11%, Si (silicon) of about 4˜14%, and titanium (Ti). Advantageously, surface corrosion of the diamond particle is low due to excellent anti-corrosion and anti-oxidization of the coating layer and a retention force is high when it is used for a sintering tool. Further, the sintering tool having the diamond particle has a long life span and an excellent cutting capability.

Abstract: Disclosed is a sintered body with high hardness for cutting cast iron, which contains cubic boron nitride(CBN), high pressure phase nitride. The sintered body of the present invention is prepared by sintering cubic boron nitride powder and powder of bonding materials on a WC/Co based hard substrate, and by forming hard layer of polycrystaline cubic boron nitride(PCBN). The bonding materials are two or more of materials selected from the group composed of titanium, aluminum and nickel, and carbide therof, nitride therof, boride therof and carbon nitride thereof, and mutual solid solution compound thereof. Volume fraction of the CBN in the PCBN hard layer is 80-98% by volume. By using the sintered body of the present invention it is possible to produce fine CBN powder with increased durability and themal stability, improving the physical property of the product.

Abstract: The present invention is related to liquid crystal display panel and making process thereof, more specifically, liquid crystal display is comprised micro lens array. In liquid crystal display panel is displaying an image to cut off light or pass light in light through area which liquid crystal is forming between upper transparent plate and lower transparent plate and distributing wire part is formed pixel area on lower transparent plate is comprising, Plural lens shape groove is systematically arranged on lower transparent plate which opposite upper transparent plate; and Having critical thickness insulating layer what is on plural lens shape groove and lower transparent plate, micro lens is formed on lower transparent plate and TFT is formed on transparent insulating layer.