EFFECT OF SILICON DOPING IN CVD DIAMOND FILMS FROM MICROCRYSTALLINE TO NANOCRYSTALLINE ON WC-<font>Co</font> SUBSTRATES

Zhang, Jianguo; Cui, Yu-xiao; Shen, Bin; Sun, Fei

doi:10.1142/s0218625x13500558

Cited by 4 publications

(2 citation statements)

References 35 publications

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“…The deposition of diamond coatings are completed in the hot filament CVD apparatus, in which the tantalum wires are used as hot filaments. The acetone is introduced as a carbon source using the bubbling method as descripted in [13]. During the deposition, the temperatures of hot filaments and the substrate surface are 2200 ± 100 • C and 900 ± 100 • C. And the negative bias voltage has been added with 40 V through the electrode poles.…”

Section: Deposition and Characterizationmentioning

confidence: 99%

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

2018

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The drilling of carbon fiber reinforced plastics (CFRP) is a significant topic for the aircraft industry. However, CFRP are materials which are difficult to cut due to their unique properties. This paper studies tools with excellent cutting performance in machining CFRP. The microcrystalline diamond (MCD), nanocrystalline diamond (NCD), and dual-layer composite MCD/NCD coatings are deposited on Co-cemented tungsten carbide (WC-Co) drills. The morphology of MCD shows pyramidal grains and the NCD and MCD/NCD coatings present cauliflower-like morphology. The cutting performances of coated tools are checked in CFRP drilling tests by the drilling force and tool wear. According to the results, the dual-layer composite MCD/NCD coated tools present the best cutting performance with the lowest drilling force. Meanwhile, the MCD/NCD coated tools display high resistance to wear and adhesive strength.

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Section: Deposition and Characterizationmentioning

confidence: 99%

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

2018

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“…The added impurities can affect the gas phase reactions, the surface mobility of the carbon species, fluid dynamics and chemical reaction kinetics . What's more, we have reported that boron and silicon doping can affect the tribological properties and cutting performance of diamond films . Thus, the investigation of the doped diamond films on WC–Co substrate has practical significance.…”

Section: Introductionmentioning

confidence: 99%

Effect of pressure on the growth of boron and nitrogen doped HFCVD diamond films on WC–Co substrate

Wang

Shen

Sun

et al. 2015

Surface & Interface Analysis

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Boron and nitrogen compounds are added in the acetone/hydrogen gas mixture to deposit hot filament chemical vapor deposition (HFCVD) diamond films on the cobalt cemented tungsten carbide (WC-Co) substrate under the pressure of 1-4 kPa. The asdeposited diamond films are characterized by field emission scanning electron microscope (FESEM), atomic force microscopy (AFM), X-ray diffraction (XRD) spectroscopy and Raman spectroscopy. The results reveal that the surface morphology, growth rate, structure and quality of the diamond films vary with the pressure and the type of the impurity addition. The diamond grains tend to develop into the nanometer scale with the decrease of the pressure. However, adding of boron or nitrogen impurities in the gas mixture will weaken the nanocrystallization effect by reducing the carbon supersaturation. Density functional theory (DFT) calculations indicate that co-adsorption of B and N containing radicals can favor the adsorption of CH 3 on diamond (100) surface. Thus, at low pressure of 1 kPa, large grained cubic (100) facet diamond rather than typical nanometer diamond is produced for B-N coaddition gas mixture. The present results appear to be useful to efficiently synthesize high quality doped diamonds with desirable properties for mechanical application.

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Cobalt concentration on the interface mechanism between diamond coating and cemented carbide substrate by first-principles calculation and experimental study

Jian

2022

Mod. Phys. Lett. B

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In this paper, cobalt concentration on the interface mechanism between diamond coating and cemented carbide substrate was used by first-principles calculation and experimental study. The interface model was built and analyzed. The effect of pretreatment time on the Co concentration on the surface of cemented carbide was studied. The relationship between the bond strength of the WC–Co/diamond interface was analyzed based on energy-dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), Raman spectroscopy and indentation. The simulation results showed that the bonding strength of the WC–Co/diamond interface increased gradually with the decrease of Co concentration and has an extreme value. The test results showed that the pretreatment decobaltization time was 20 min and the bonding strength of the membrane substrate is good. What was more, the results of EDX, SEM, Raman, indentation confirmed this conclusion.

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EFFECT OF SILICON DOPING IN CVD DIAMOND FILMS FROM MICROCRYSTALLINE TO NANOCRYSTALLINE ON WC-Co SUBSTRATES

Cited by 4 publications

References 35 publications

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

Cutting Performance of Microcrystalline, Nanocrystalline and Dual-Layer Composite Diamond Coated Tools in Drilling Carbon Fiber Reinforced Plastics

Effect of pressure on the growth of boron and nitrogen doped HFCVD diamond films on WC–Co substrate

Cobalt concentration on the interface mechanism between diamond coating and cemented carbide substrate by first-principles calculation and experimental study

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