PVD nano multiple-layer coating for cutting stainless steel and preparation method thereof
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A nano-multilayer, stainless steel technology
Inactive Publication Date: 2008-06-18
CENT SOUTH UNIV
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The HV hardness of ordinary TiAlN coating is 30±5GPa, and the oxidation resistance temperature is 800°C, which can no longer meet the needs of stainless steel under the harsh service conditions of high-speed cutting and dry cutting.
Increasing the Al content in the TiAlN coating can improve the hardness and oxidation resistance of the coating, but too high Al content will cause the crystal structure of the coating to change from a face-centered cubic structure to a close-packed hexagonal structure, thereby deteriorating the mechanical properties of the coating. performance drops dramatically
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Embodiment 1
[0023] Stainless steel (1Cr18Ni9Ti) is cut after depositing the common TiAlN coating and the nanometer multi-layer coating of the present invention respectively with the cemented carbide blade whose grade is YG8 and model CNMG120408.
[0024] Referring to Figure 1, the specific manufacturing process is as follows:
[0025] (A), cleaning the surface of the cemented carbide substrate 7;
[0026] (A'): Depositing a metal Ti layer 6 with a thickness of 20-30 nm and a transition layer 5 of 20-40 nm TiN on the treated cemented carbide substrate 7;
[0027] (B), using 1 Ti target, 2 Ti x al 1-x Target and 1 piece of Ti y al 1-y target. During multi-target reactive magnetron sputtering, the placement positions of the four working targets are: Ti target and Ti target y al 1-y The targets are respectively placed in positions 8 and 10 of the vacuum chamber, and two Ti x al 1-x The targets are respectively placed in positions 9 and 11 of the vacuum chamber, and the vacuum degree ...
Embodiment 2
[0032] Stainless steel (1Cr18Ni9Ti) was milled after depositing common TiAlN coating and nanometer multi-layer coating of the present invention respectively with grade YG10 and model SEET12T3 cemented carbide inserts.
[0033] Referring to Figure 1, the specific manufacturing process is as follows:
[0034] (A), cleaning the surface of the cemented carbide substrate 7;
[0035] (A'): Depositing a metal Ti layer 6 with a thickness of 20-30 nm and a transition layer 5 of 20-40 nm TiN on the treated cemented carbide substrate 7;
[0036] (B), using 1 Ti target, 2 Ti x al 1-x Target and 1 piece of Ti y al 1-y target. During multi-target reactive magnetron sputtering, the placement positions of the four working targets are: Ti target and Ti target y al 1-y The targets are respectively placed in positions 8 and 10 of the vacuum chamber, and two Ti x al 1-x The targets are respectively placed in positions 9 and 11 of the vacuum chamber, and the vacuum degree of the vacuum ch...
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Abstract
The invention discloses a PVD nanometer multiple-layer coating used for cutting stainless steel and a preparation method thereof. The specific manufacturing process is as follows: firstly, implementing the surface cleaning treatment on carbide base; secondly, adopting a multiple targets magnetic sputtering method to alternatively deposit the nanometer multiple-layer coating which takes TiN (Tix, Al1-x)N/(Tiy, Al1-y)N/(Tix, Al1-x)N as a modulation period on the rotating carbide base; adopting Ar2 as the sputtering gas. The flow of Ar is 180-300cm3/s, the partial pressure is 1.7-9.0'10<-1>Pa, the reaction gas is N2, and the total pressure is controlled through controlling the partial pressure of N2. The invention introduces TiAlN with high Al content and perfect high temperature oxidation resistance into a multiple-layer coating material system, improves the high temperature oxidation resistance and the hardness of the coating, enhances the toughness of the coating through the microstructure optimization design and enables the coating to obtain both the high temperature oxidation resistance and excellent mechanical properties. The nanometer multiple-layer coating prepared through the invention is provided with great application value in the stainless steel cutting process.
Description
technical field [0001] The invention relates to a PVD nanometer multilayer coating for cutting stainless steel, which can be used in the technical field of cutting tools, and is especially suitable for cutting stainless steel materials. The invention also relates to a PVD nanometer multilayer coating for cutting stainless steel. Coating preparation method. Background technique [0002] High-speed cutting and dry cutting are increasingly becoming the mainstream of cutting technology development due to their high machining efficiency and less environmental pollution. This processing technology puts forward higher requirements on the performance of the tool coating, which not only requires the tool coating to have high hardness, low friction coefficient, but also high oxidation resistance. Commonly used single coatings such as TiN cannot meet the further development of cutting processing technology due to their low hardness (room temperature hardness is lower than 25GPa). Add...
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