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Wear-resistant pvd tool coating containing tialn nanolayer film

A coating cutting tool and coating technology, applied in the field of metal cutting tools, can solve the problems of high surface roughness and trouble of the deposited layer

Active Publication Date: 2022-05-03
WALTER AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, a significant disadvantage of Arc-PVD is the process-related deposition of large particles (droplets) caused by the dispersion of small metal spatters, which is very troublesome to avoid
These droplets lead to an undesirably high surface roughness of the deposited layer

Method used

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  • Wear-resistant pvd tool coating containing tialn nanolayer film
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  • Wear-resistant pvd tool coating containing tialn nanolayer film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0081] Example 1 - Deposition of coatings according to the invention and comparative coatings

[0082] In the examples and comparative examples of producing cutting tools according to the present invention as follows, a cemented carbide cutting tool substrate body (composition: 12% by weight of Co, 1.6% by weight of (Ta, Nb) C, the rest are WC; WC grain size: 1.5 μm; geometry: ADMT160608R-F56) for coating. The measured residual stress at the substrate surface prior to heating in the deposition chamber was +200 MPa, ie low tensile residual stress.

[0083] Prior to deposition, the substrate body was pretreated by ultrasonic cleaning in ethanol and plasma cleaning. Vacuum the PVD reactor to 8 × 10 -5 mbar, and pretreat the substrate at 550°C.

[0084] To deposit (Ti,Al)N coatings, two types of targets with different atomic ratios Ti:Al were used to fabricate alternately stacked (Ti,Al)N sublayers, which The sublayers differ in the atomic ratio Ti:Al: "Ti50Al50" (Ti:Al=50:50)...

Embodiment 2

[0088] Example 2 - Residual Stress, Hardness and Young's Modulus

[0089] For the (Ti,Al)N sublayer stacks L1 and L2 deposited according to Example 1, residual stress, hardness and Young's modulus were measured as described above. Because the parameters during the deposition of the individual (Ti,Al)N sublayer stacks L1 or L2, respectively, remain constant, the residual stress in the individual (Ti,Al)N sublayer stacks is constant, but due to the different composition And depending on the arc current applied, the individual layer stacks differ from one another. As described above, each (Ti,Al)N sublayer stack L1 and L2 is respectively deposited directly on the surface of the substrate. The thickness of the layer stack is approximately 2 to 4 μm. The results are shown in Table 2 below.

[0090] Table 2:

[0091]

[0092] The results show that the applied arc current has an effect on the residual stress of the deposited (Ti,Al)N sublayer stack, which also depends on the c...

Embodiment 3

[0095] Example 3 - Surface Roughness

[0096] In order to compare the effect of nitrogen pressure during deposition, two (Ti,Al)N sublayer stacks of L2 type were deposited at 4Pa and 10Pa, respectively, and the surface roughness was measured. The results are shown in Table 2 below. The SEM cross-section of the sample is shown in figure 1 middle. It can be clearly seen that the samples deposited under 4Pa ( figure 1 A) Compared with the sample deposited under 10Pa ( figure 1 B) shows larger droplets. Consequently, the samples deposited at 10 Pa exhibited a much smoother surface roughness. It has been observed that smoother surfaces with fewer droplets and defects are generally obtained if higher pressures are applied during deposition.

[0097] table 3:

[0098]

[0099] Example 4 - cutting test

[0100] In order to evaluate the effect of the coating according to the invention, multilayer coated cutting tools were manufactured and tested in milling tests with respect...

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Abstract

The invention relates to a coating cutting tool and a manufacturing method thereof. The coating cutting tool is composed of a base material and a hard material coating, and the base material is selected from cemented carbide, cermet, ceramic, cubic boron nitride (cBN), polycrystalline diamond (PCD) or high speed steel (HSS), wherein the hard material coating comprises a (Ti,Al)N layer stack (L) of alternately stacked (Ti,Al)N sublayers , said layer stack (L) is characterized in that: - the total atomic ratio of Ti:Al in said (Ti,Al)N layer stack (L) is in the range of 0.33:0.67 to 0.67:0.33; - The total thickness of the (Ti,Al)N layer stack (L) is in the range of 1 μm to 20 μm; - in the (Ti,Al)N layer stack of alternately stacked (Ti,Al)N sublayers Each individual (Ti,Al)N sublayer within (L) has a thickness in the range of 0.5 nm to 50 nm; Each individual (Ti,Al)N sublayer within the stack (L) differs from the immediately adjacent (Ti,Al)N sublayer in the atomic ratio Ti:Al; On the thickness of the (Ti, Al)N layer stack (L), from the interface of the (Ti, Al)N layer stack (L) aligned toward the substrate to the at the interface of the (Ti,Al)N layer stack (L) in the direction of the outer surface of the coating, the Al content increases and the Ti content decreases; - at the (Ti,Al)N layer perpendicular to the substrate surface , Al)N layer stack (L), from the interface of the (Ti,Al)N layer stack (L) aligned towards the substrate to the layer aligned towards the outside of the coating At the interface of said (Ti,Al)N layer stack (L) in the direction of the surface, the residual stress σ drops by an amount of at least 150 MPa to at most 900 MPa, whereby applying the sin based on (200) reflection 2 Ψ method to measure the residual stress σ by X-ray diffraction; Said residual stress σ in a portion of a thickness of at least 100 nm to at most 1 μm from the interface of the layer stack (L) is in the range of 0 MPa to +450 MPa.

Description

technical field [0001] The invention relates to a metal cutting tool comprising a substrate of cemented carbide, cermet, ceramic, steel or high speed steel and a multilayer wear-resistant protective coating applied to the substrate. The invention also relates to the use of metal cutting tools and methods of manufacturing such tools. Background technique [0002] Cutting tools, such as those used for example for metal cutting, generally consist of a substrate (substrate) made of cemented carbide (hard metal), cermet, steel or high-speed steel, which has Vapor deposition) or PVD process (Physical Vapor Deposition) A wear-resistant single-layer or multi-layer coating of a metallic hard material layer deposited on it. There are many different PVD methods such as cathode sputtering, cathodic vacuum arc evaporation (Arc-PVD), ion plating, electron beam evaporation and laser ablation which require different equipment and result in different coating properties. Cathodic sputtering...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C28/04C23C14/02C23C14/06C23C14/32C23C30/00
CPCC23C14/022C23C14/0641C23C14/325C23C28/044C23C28/048C23C30/005B23C5/006C23C14/35
Inventor 法伊特·席尔沃尔夫冈·恩格哈特
Owner WALTER AG
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