Micron-nano WC-Co hard alloy, preparation process and application thereof

Abstract

The invention discloses a micron-nano WC-Co hard alloy, a preparation process and application thereof. According to the hard alloy, micron scale WC particles and nano scale WC particles serve as hard phase raw materials and account for 80-95 wt.%, micron scale WC particles and nano scale WC particles can be in any proportion, 0.01-5 wt.% of VC serves as a grain growth inhibitor, and 3-20 wt.% of Co serves as a binder phase. The preparation process comprises procedures such as ball milling, drying, pelleting, press forming and vacuum sintering which are conducted sequentially. According to the hard alloy, the preparation process and the application, a traditional powder metallurgy process is adopted, the harmonious enhancement function of micron-nano particles of different scales is used, the hard alloy has performance characteristics of both micron coarse-grain hard alloys and ultra-fine grain and nanocrystalline hard alloys, both the strength and the toughness are considered, and good comprehensive performance such as strength, hardness, shock resistance and wearing resistance is represented. Combinations of micron-nano particles can be designed according to requirements of different application areas, regulation and control of performance are achieved, and good modification and improvement of traditional hard alloy products are achieved.

Description

technical field [0001] The invention relates to a hard alloy and a preparation method thereof, in particular to a micronano WC-Co hard alloy, a preparation method and an application thereof. Background technique [0002] Cemented carbide is an alloy material made of hard compounds of refractory metals and bonding metals through powder metallurgy. It mainly uses carbides (WC, TiC) as the main component, and cobalt (Co) or nickel (Ni ), molybdenum (Mo) is the binder, and the WC-Co series is the most widely used. Cemented carbide has a series of excellent properties such as high hardness, wear resistance, good strength and toughness, heat resistance and corrosion resistance, especially its high hardness and wear resistance, which basically remain unchanged even at a temperature of 500°C , It still has a high hardness at 1000°C, and is widely used as industrial cutting tools, mining drills, wear-resistant parts, precision parts, etc. The mechanical properties of cemented carbi...

AI Technical Summary

Problems solved by technology

With the rise of nanotechnology, the development of cemented carbide has also experienced the introduction of various nano-modification technologies, especially the second-phase hard nanoparticles such as TiN, Al 2 o 3 , ZrO 2 , AlN, etc., to improve the mechanical properties of traditional cemented carbide, but the second phase often brings more complex interface control and more difficult quality control problems

Images