PVD coating with strong (111) texture and preparation method thereof

A coating and texture technology, applied in the fields of cutting tools and powder metallurgy composite materials, to achieve the effect of improving crystal integrity, reducing crystal defects and improving service life

Active Publication Date: 2019-09-27
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There is no report of PVD coating with TC(111)>2.5

Method used

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  • PVD coating with strong (111) texture and preparation method thereof
  • PVD coating with strong (111) texture and preparation method thereof
  • PVD coating with strong (111) texture and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] WC–0.7Cr prepared by pressure sintering process 3 C 2 –0.4VC–10Co (where the value is the mass fraction, %, the same below) and WC–0.4Cr 3 C 2 –0.3VC–6Co carbide inserts, and TiC 0.7 N 0.3 –25WC–10TaC–2Mo 2 C–6Co–6Ni cermet inserts as figure 1 Substrate for coated inserts for milling operations shown. At the same time, alloy samples for testing with the corresponding material of 10×10×5mm were also prepared. The scanning electron microscope observation and analysis results show that the grain size of the two cemented carbides is ~0.4 μm, and the (Ti,M)C with a typical core ring structure in the cermet 0.7 N 0.3 (M=W, Ta, Mo) The grain size of the hard phase is ~1.2μm; the above three alloys all have a normal two-phase structure of hard phase + binder phase. The results of differential scanning calorimetry showed that the eutectic temperatures of the above three alloys were 1310°C, 1325°C and 1340°C, respectively.

[0037] Put the above-mentioned alloy blades a...

Embodiment 2

[0048] Three kinds of 10×10×5mm square cemented carbide samples, WC–10Co, WC–10Ni and WC–5Co–5Ni prepared by pressure sintering process, were used as coating substrates. Scanning electron microscope observation and analysis results show that the grain size of the three cemented carbides is ~1.2 μm, and they are all normal hard phase + binder phase two-phase structure. The results of differential scanning calorimetry showed that the eutectic temperatures of the above three alloys were 1370°C, 1400°C and 1385°C, respectively.

[0049] The above-mentioned square alloy samples treated by sandblasting and grinding were divided into 4 groups, and each group contained 3 kinds of alloys. 2 o 3 And 3% (mass fraction, the same below) graphite powder, CeO 2 and 4% graphite powder, Pr 6 o 11 and 5% graphite powder, Nd 2 o 3 In the mixed powder filler composed of 6% graphite powder; the purity of the above-mentioned rare earth oxide and graphite powder is 99.9%; the sieve aperture co...

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Abstract

The invention relates to a PVD coating with a strong (111) texture and a preparation method thereof. The crystal structure of the single or complex phase of the PVD coating is consistent with or similar to at least one of fcc-TiN or fcc-AlN, and the (111) crystal surface texture coefficient of the coating is larger than 2.5. According to the preparation method, a WC-based hard alloy or a TiCN-based metal ceramic hard material is adopted as a matrix, the target regulation on the surface structure of the coating is realized by carrying out secondary sintering regulation on the matrix of the hard material before coating; and the surface structure of the matrix is changed, so that the nucleation and growth conditions of the PVD coating are changed, the effect that the strong (111) texture is formed is achieved, the service life of a coating cutter is remarkably prolonged, and the requirements for high performance and high service life on the PVD coating cutter of high-efficiency machining of a difficult-to-machine material are met.

Description

technical field [0001] The invention relates to a PVD coating with a strong (111) texture and a preparation method thereof, belonging to the technical field of powder metallurgy composite materials and the field of cutting tools. Background technique [0002] Coated hard materials are composed of two parts: a hard material substrate and a coating. The surface structure of a hard material substrate has an important influence on the nucleation and growth of coatings in direct contact with it. If the coating is a multilayer composite coating, the subsequent growth of the coating will in turn inherit this effect. Changes in the coating nucleation and growth environment can affect the performance of the coating and its cutting tool life. [0003] WC-based cemented carbide and TiCN-based cermet refer to cemented carbide and cermet with WC and TiCN as main components respectively, which are typical hard materials. Hard materials consist of a hard phase and a ductile binder phase...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C29/08C22C29/04B22F3/10C23C14/35C23C14/06C23C14/02B22F5/00
CPCB22F3/1007B22F5/00B22F2005/001C22C29/005C22C29/04C22C29/067C22C29/08C23C14/022C23C14/0641C23C14/35
Inventor 张立吴厚平熊湘君谢亚李凯
Owner CENT SOUTH UNIV
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