Preparation method of titanium boride compounded titanium carbide-based metal ceramic cutter material

Abstract

The invention relates to a novel material and particularly relates to a preparation method of a titanium boride compounded titanium carbide-based metal ceramic cutter material. The titanium boride compounded titanium carbide-based metal ceramic cutter material comprises the following primary powder in percentage by mass: 58.22wt%-60.11wt% of TiC, 33.78wt%-34.89wt% of TiB2, 0-3.55wt% of Mo and 4.45wt%-8wt% of Ni. A preparation process comprises the following steps: respectively filling a ball milling cylinder with TiC and TiB2 in a formula, and carrying out wet milling for 48 hours in alcohol by virtue of a tungsten carbide ball; carrying out vacuum drying at 100-120 DEG C, filtering by virtue of a 100-mesh sieve, and packaging for later use; weighing primary powder Ni and Mo and ball-milled TiC and TiB2 by mass, and mixing, carrying out wet milling for 48 hours, carrying out vacuum drying, and packaging for later use; weighing mixed powder by weight in a cutter preparation process, adding the mixed powder into a graphite mold, and carrying out vacuum sintering; heating from the room temperature to 700 DEG C at a heating rate of 50DEG C / min, and maintaining the temperature for 2min; and heating from 1450 DEG C to 1650 DEG C at the heating rate of 50DEG C / min, and carrying out thermal pressure sintering forming when a pressure of 32MPa is applied and the temperature is maintained for 30min. The preparation process is simple, stable, low in cost and high in efficiency; when the high hardness of the prepared cutter material is preserved, the bending strength and the fracture toughness are improved; and the prepared cutter material can be applied to other high-temperature wear-proof structural components.

Description

1. Technical field [0001] The invention relates to the technical field of new materials, in particular to a preparation method of titanium boride composite titanium carbide-based cermet tool material. 2. Background technology [0002] Cermet not only maintains the high strength, high hardness, wear resistance, high temperature resistance, oxidation resistance and chemical stability of ceramics, but also has good toughness and plasticity. It is a very important high-performance structural material. Among them, titanium carbide (TiC)-based cermet is a kind of cermet tool material that has developed rapidly in recent years. The melting point of TiC (3250 ° C) is higher than that of WC (2630 ° C), good wear resistance, and the density is only 1 / 3 of WC. , the oxidation resistance is far superior to WC. Initially TiC-based cermets were used to fill WC-Co-based cemented carbide and A1 2 o 3 The gap between ceramic tool materials is suitable for high-speed finishing tools. Later...

AI Technical Summary

Problems solved by technology

Each of the above preparation processes has its merits, but the preparation equipment and process are complicated, the cost is high, and the prepared TiC-TiB 2 The comprehensive mechanical properties of composite materials are not high. When the flexural strength or fracture toughness is increased, the hardness of the material is seriously reduced, which makes the material unable to be promoted and used.

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