Fine-grained cubic boron nitride blade and preparation method thereof

Abstract

The invention relates to a fine-grained cubic boron nitride blade. The blade is prepared from, by weight, 60%-80% of micro cubic boron nitride powder and 20%-40% of nano-binder, wherein the nano-binder is prepared from, by weight, 25%-45% of TiN powder, 17%-20% of NbC powder, 12%-15% of Al2O3 powder, 12%-15% of HfC powder, 6%-10% of Be powder, 6%-10% of WC powder and 2%-5% of Mo power. By adding the nano-binder, formation of a tough sintering body is promoted, the toughness of the cubic boron nitride blade is increased, and the service life is prolonged. According to the fine-grained cubic boron nitride blade prepared through the preparation method, the technical indexes can reach the conditions that the grain size is smaller than or equal to 1 micrometer, the abrasive ratio ranges from 7,000 to 7,500, the microhardness HV ranges from 6,000 to 6,500, and the bending strength ranges from 850 MPa to 900 MPa, and the requirements of precise machining can be met.

Description

technical field [0001] The invention belongs to the technical field of superhard materials, and in particular relates to a fine-grained cubic boron nitride blade and a preparation method thereof. Background technique [0002] With the development of manufacturing technology, cutting processing is developing in the direction of high speed, high precision, and large depth of cut. As one of the most important superhard material cutting tools, cubic boron nitride cutting tools in cutting processing have high hardness, Wear resistance and chemical stability, suitable for machining requirements such as high-speed cutting, hard cutting, dry cutting, etc. Incomparable superiority. [0003] In order to improve the wear resistance, impact toughness and machinability of cubic boron nitride tools, well-known foreign companies have introduced fine-grained tool products with CBN particle sizes below 1 micron or even 0.5 microns. The CBN particle size used by Sumitomo’s BN300 in Japan is ...

AI Technical Summary

Problems solved by technology

However, the purchase and use of foreign fine-grained cubic boron nitride cutting tools is very expensive, resulting in high production costs, while domestic cubic boron nitride cutting tools are limited by the formula and process, and research on fine-grained cubic boron nitride cutting tools and its applications is relatively Western. There is a big gap between developed countries, which is mainly reflected in the tool toughness, tool impact resistance, wear resistance, tool life and machining accuracy.