面向石墨模具精密加工的金刚石涂层结构及性能

doi:10.11896/cldb.20030179

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Abstract Diamond coating has ultra-high hardness and wear resistance which was close to that of natural diamond, and is considered to be an ideal tool coating material for precision machining of graphite molds. The bonding force between the diamond coating and the substrate, and the surface state of the coating are the keys to the quality and efficiency of high-speed dry cutting. The pre-treatment of the diamond coating and the coating process are important factors that affect the property of the diamond-coated tool. This article used acid-alkali-acid three-step method to pre-treat the cemented carbide materials based on hot-wire chemical vapor deposition technology. Atmospheric flow rate and high pressure deposition process were used to deposit diamond coating on the tool substrate. Scanning electron microscope (SEM), atomic force microscope (AFM), Raman spectroscopy (Raman), X-ray diffraction spectroscopy (XRD) were used to analyze and characterize the coating microstructure and phase structure. The sand blast test was used to test the erosion resistance of the diamond coating, and the graphite mold cutting test was used to characterize the cutting performance of the diamond coated tool. The results show that the diamond coating has a typical octahedral structure, the coating and the substrate are closely combined without obvious pores, the surface roughness of the diamond coated tool is about 150 nm, the content sp3 is more than 98%, the coating hardness is higher than 90 GPa, diamond coating grows preferentially along the (111) plane, the erosion resistance time is greater than 150 s (0.5 MPa, 120 mesh), the roughness of the processed surface is less than 1μm after high-speed cutting graphite mold for 2 h, reaching the level of imported tools. There is a small amount of chipping on the rake face of the tool after the cutting. Therefore, the wear of the rake face is the main form of wear for processing graphite molds.

Key words： diamond coating cutting tool graphite mold structure and property

Published: 03 August 2021

CLC number:

TG174.444

Fund:Key-area Research and Development Program of Guangdong Province(2020B010185001), Key-area Research and Development Program of Guangzhou City (202007020008), Science and Technology Project of Guangdong Academy of Science (2020GDASYL-20200105004, 2018GDASCX-0402, 2018GDASCX-0111).

About author:: Hong Li received his Ph.D. degree in materials science and engineering from University of Science and Technology Beijing in January 2016. And joined the vacuum coating research laboratory of the Guangdong Institute of New Materials in July 2016. Now he has been engaged in the development of diamond coating preparation processes, focusing on the preparation, characterization and application research of super-hard coatings. He has published more than 10 articles in important domestic and foreign journals, declared 5 invention patents, and authorized 2 invention patents.

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	LI Hong
	XU Wei
	SU Yifan
	LIN Songsheng
	DAI Mingjiang
	SHI Qian

Cite this article:

LI Hong,XU Wei,SU Yifan, et al. Structure and Performance of Diamond Coating for Graphite Mold Precision Machining[J]. Materials Reports, 2021, 35(14): 14030-14034.

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http://www.mater-rep.com/EN/10.11896/cldb.20030179 OR http://www.mater-rep.com/EN/Y2021/V35/I14/14030

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