Cutting tool for improving coating structure, and preparation method thereof

Abstract

The invention discloses a cutting tool for improving a coating structure. The cutting tool comprises a base body and a coating arranged on the base body, wherein the coating comprises an inner layer A, a transition layer C and an outer layer B from inside to outside; the inner layer A mainly comprises compound material formed by transition elements and non-metallic elements; the outer layer B mainly comprises oxide and the like; the transition layer C comprises a transition layer C1, a transition layer C2 and a transition layer C3 from outside to inside; the transition layer C1 mainly consists of TiCx1Ny1Oz1; the transition layer C2 mainly consists of TiCx2Ny2Oz2; and the transition layer C3 mainly consists of TiAlCx3Ny3Oz3 or TiCx3Ny3Oz3. A preparation method of the cutting tool comprises the steps of: combining chemical vapor deposition (CVD) and high-temperature (HT)-CVD onto the base body, and coating in sequence by various coating technologies. The cutting tool has the advantages of being good in wear resistance, high in adhesive force, high in inhibition, etc.

Description

technical field [0001] The invention belongs to the field of metal cutting, in particular to a coated cutting tool and a preparation process thereof. Background technique [0002] Coated cutting tool inserts are widely used in machining in various industries such as automobiles, aviation, and microelectronics. The processing materials include ordinary metal materials such as steel, copper, and aluminum, as well as various alloys, ceramics, or composite materials. In the machining process, there are two failure systems for coated tools: wear and damage. Tool wear is mainly abrasive wear, adhesive wear, diffusion wear, and oxidation wear. Under different cutting conditions, when processing workpieces of different materials, the main reason for wear may be one or two of them. Generally speaking, when the cutting temperature is low, it is mainly abrasive wear, and when the cutting temperature is high, it is mainly due to diffusion wear. , mainly oxidative wear. [0003] Now i...

AI Technical Summary

Problems solved by technology

[0006] However, due to the needle-like structure of TiCO, TiAlCNO, TiBN and other oxygen-containing coatings, they are brittle and have limited effects on the diffusion of cobalt and tungsten from the substrate to the coating when the thickness is thin; and a single TiO, TiCO Or the TiAlCO transition layer cannot nucleate uniformly on the surface of the bottom coating A, so when the deposition time is short, the distribution of the TiCO transition layer on the bottom coating A is uneven and not dense, further affecting the outer layer α-Al 2 o 3 The nucleation of the outer oxide layer leads to coarse grains and inhomogeneity of the coating; while the thickness of the oxygen-containing transition layer is too thick, it will lead to the growth of transition layer grains, which will reduce the surface layer α-Al 2 o 3 layer nucleation density, even some needle-like grains grow abnormally, deep into the surface layer of α-Al 2 o 3 coating, forming a stress concentration point and reducing the surface α-Al 2 o 3 Coating strength; at the same time, if the thickness of the oxygen-containing transition layer is too thick, a very brittle crack propagation layer will be formed between the coatings, reducing the bonding strength of the surface coating

[0007] In summary, the existing patents only deal with TiCN / Al from different perspectives. 2 o 3 The transition layer was studied, without comprehensive consideration of the effect of the transition layer on TiCN / Al 2 o 3 Influence of coating system

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