High-wear resistant Ti (C, N)-base ceramet tool bit and preparation thereof

Abstract

The invention provides a high-abrasion Ti(C, N) based metal ceramic tool and a preparation thereof. The Ti(C, N) based metal ceramic tool uses Ni and Co as a binder phase, is added with at least one carbonitride of Ti(Cx, N1-x) or (TiC)x plus (TiN)1-x as a basic batch, and consists of at least one composition of WC, Mo2C, Co, Ni, ZrC, Cr3C2, VC, TaC and NbC, and the balance being Ti(Cx, N1-x) or (TiC)x plus (TiN)1-x, wherein, an X value for adding the carbonitride of the Ti(C, N) based metal ceramic tool is as follows: X is less than or equal to 0.5 and more than or equal to 0.4, or the X is more than 0.5 and less than or equal to 0.7. The Ti(C, N) based metal ceramic tool is prepared according to the content of nitrogen by nitrogen pressure sintering or vacuum sintering combined with hot isostatic pressing treatment, thereby preventing nitrogen from escaping during the process of sintering high-nitrogen alloy, so that the high-nitrogen-carbon ratio in matrix and material hardness can be reliably guaranteed, and anti-oxidative abrasion property and anti-diffusive abrasion property of the material can be obviously increased through adding slight ZrC, Cr3C2, VC and other carbides into the basic batch; meanwhile, compactability and buckling strength of a low-nitrogen alloy structure can be obviously improved through optimally distributing each composition and content. The Ti(C, N) based metal ceramic tool is widely suitable for high-speed cutting tools of medium-low carbon steel and low alloy steel.

Description

technical field [0001] The invention relates to a Ti(C,N)-based cermet cutter, in particular to a highly wear-resistant Ti(C,N)-based cermet cutter and its preparation. Background technique [0002] Ti(C, N) (titanium carbonitride)-based cermets were developed on the basis of TiC (titanium carbide)-based cermets in the early 1970s, with Ti(C, N) as the main hard phase, nickel, molybdenum Tool material for the binder phase. Because of its high hardness, high red hardness, high oxidation resistance and corrosion resistance, and high resistance to adhesive wear and diffusion wear during cutting, it fills the gap between WC (tungsten carbide)-based cemented carbide and ceramics, especially Suitable for semi-finishing and finishing machining of steel and cast iron. At present, the amount of foreign cutting tool materials has accounted for 10% to 30% of the total amount of cutting tool materials. In China, cutting tools are still mostly made of WC-based cemented carbide or cera...

AI Technical Summary

Problems solved by technology

Traditional WC-based cemented carbide has low wear resistance and short life when cutting carbon steel and cast iron at high speed; while ceramic tools such as Al 2 o 3 (Al2O3), CBN (cubic boron nitride), artificial diamond and other tools, due to their high brittleness, high cost, and easy chipping during cutting, etc., limit their wide use in industry.

Although the existing TiC-based cermet tools have high hardness, they have low bending strength, poor red hardness, oxidation resistance and high-temperature creep resistance, and cannot meet the requirements of high-speed cutting; while Ti(C,N)-based metal Ceramic tools such as NT series have poor resistance to oxidation wear and diffusion wear during high-speed cutting, which seriously affects the service life of the tool, and high-nitrogen alloys such as Ti(C 0.5 N 0.5 )-based cermets have the problem of many pores

In addition, Chinese Patent Publication No. CN1477222A discloses TiC or Ti(C, N)-based cermet cutters modified with nano-TiN, the preparation process of the cutter and the use method of the cutter. The added nano-TiC not only increases the cost of raw materials, Moreover, it is difficult to control its uniform dispersion and other defects.

Images