Born nitride-based composite ceramic die material and preparation method thereof

Abstract

The invention discloses a boron nitride-based composite ceramic die material and a preparation method thereof. The material is prepared from, by mass, 50.0-58.0% of boron nitride, 21.3-24% of tungsten carbide, 11.0-13.8% of zirconia, 1.0-1.8% of yttrium oxide, 3.2-3.8% of samaria, 1.8-2.2% of bismuth oxide, 1.6-2.0% of copper oxide and 2.1-2.4% of molybdena, wherein boron nitride is formed by mixing boron nitride nano-powder with the particle size of 5-15 nm and boron nitride micro-powder with the particle size of 15-25 [mu]m according to a mass ratio of 1:0.12-0.15. The preparation method comprises the following steps: weighing all raw material powders in proportion, carrying out ball milling mixing, drying the above obtained mixture, grinding and sieving the dried mixture, carrying out granulation molding, and carrying out gas pressure sintering to obtain the material. The material has the advantages of excellent fracture toughness, excellent hardness, excellent bending strength, excellent antifriction and anti-wear performances, strong ageing resistance and strong defect resistance, and can be widely applied to die materials.

Description

technical field [0001] The invention relates to the technical field of ceramic mold materials, in particular to a boron nitride-based composite ceramic mold material and a preparation method thereof. Background technique [0002] The mold is a tool that makes the blank into a workpiece with a specific shape and size under the action of external force. Widely used in blanking, die forging, cold heading, extrusion, powder metallurgy parts pressing, pressure casting, and compression molding or injection molding of engineering plastics, rubber, ceramics and other products. The mold has a specific contour or inner cavity shape, and the contour shape with cutting edges can be used to punch the blank according to the contour line shape. Applying the shape of the inner cavity can make the blank obtain the corresponding three-dimensional shape. The mold generally includes two parts, the movable mold and the fixed mold, which can be separated or combined. Take out the parts when th...

AI Technical Summary

Problems solved by technology

[0003] Mold is an indispensable and important equipment in the manufacture of communication equipment, industrial devices, and auto parts. However, the working environment of the mold, such as huge extrusion impact, flow friction, etc., will cause the temperature of the mold to rise, so mold sticking often occurs , welding or oxidation, etc., which aggravate the wear of the mold and greatly reduce the service life of the mold

In particular, the higher temperatures generated by the hot extrusion process often lead to softening of the mold material and reduced wear resistance, reduced service life and poor surface quality of the product