Microbit deposited with AlTiN coating, and preparation method thereof

Abstract

The invention discloses a microbit deposited with an AlTiN coating. The microbit deposited with the AlTiN coating comprises the AlTiN coating, wherein the AlTiN coating comprises a Cr binding layer, aCrN transition layer and an AlTiN function layer stacked sequentially; and the AlTiN coating has a high binding force, can be firmly combined on the surface of the microbit, is not easy to flake, issmooth in surface, and less in large particle quantity, so that the microbit has high hardness and high temperature wearability, and can maintain the high performance during long-time high-speed operation. The invention further discloses a preparation method of the microbit deposited with the AlTiN coating. The AlTiN coating is prepared on the surface of the microbit by utilizing a plused arc technology, and a high-density plasma can be produced during the pulse discharge period through controlling the nitrogen and argon flow, the pulsed arc peak value, the duty ratio and the frequency, so that the deposition speed of the function layer is fast, and the deposition process is simple, good in repeatability, can be applied to mass production in industry, and has a favorable economic benefit.

Description

technical field [0001] The invention relates to the technical field of micro-drill manufacturing, in particular to a micro-drill deposited with an AlTiN coating and a preparation method thereof. Background technique [0002] Enterprises generally use micro drills to drill holes on PCB boards. And existing micro-drill, its base material is alloy steel material commonly used, although this material has advantages such as high rigidity and high hardness, the diameter of drill is very little, and drill rigidity is low, and lateral stability is poor, thereby causes micro-drill to work When it is easy to break and wear, it will have a bad influence on the processing of PCB boards; , high precision, long life and low cost. [0003] In the prior art, an effective way to improve the cutting performance of the micro-drill is to coat the micro-drill. Due to the continuous high-speed drilling of the micro-drill, heat is accumulated on the micro-drill, which easily causes the coating ...

AI Technical Summary

Problems solved by technology

Although the melting point of the TiN coating is high, when the working temperature reaches above 500 °C, the TiN coating will be partially oxidized into loose TiO 2 In some cases, the degree of bonding between the coating and the micro-drill is greatly reduced, causing the coating to peel off rapidly and fail, which eventually leads to a serious decline in the performance of the micro-drill

[0004] Furthermore, arc ion plating technology is a widely used micro-drill coating preparation method nowadays, but the coating deposited by traditional cathodic arc ion plating has a rough surface and a large number of large particles, which makes micro-drills difficult to drill at high speeds. Higher friction when drilling, more heat generation, faster coating wear

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