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Naichao Chen
Shanghai Key Laboratory of Materials Protection and Advanced Materials in Electric Power, Shanghai 200090, China

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Journal article
Published: 10 May 2021 in Coatings
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To improve the growth rate of chemical vapor deposition (CVD) diamond coating, increasing the chemical reaction rate is essential. A novel method of dispersing graphene oxide (GO) particles as adsorbent on the substrate prior to deposition was proposed, with which the diamond coating with large grain size and high thickness was deposited on the silicon nitride under the normal CVD environment. The as-deposited diamond coating was characterized by scanning electron microscopy (SEM), surface profilometer, atomic force microscope (AFM), Raman spectrum, and indentation. The surface morphologies showed that the GO particles were covered by a layer of diamond coating. The diamond coating without and with GO particles had growth rates of 1.10–1.38 and 1.50–2.94 μm h−1, respectively. No differences in the Raman spectra of the microcrystalline diamond (MCD) coatings without and with GO particles were found. Indentation tests suggested that GO particles could enhance the adhesive strength and the crack resistance of diamond coating, which may result from the large thickness and the strong adsorbed capacity of destructive energy. Hence, dispersing particles on the substrate can be regarded as a potential and alternative technique by accelerating the CVD chemical reaction to obtain desired diamond coating.

ACS Style

Fan Zhou; Naichao Chen; Fasong Ju. Enhanced Growth Rate of Chemical Vapor Deposition Diamond Coating Motivated by Graphene Oxide. Coatings 2021, 11, 559 .

AMA Style

Fan Zhou, Naichao Chen, Fasong Ju. Enhanced Growth Rate of Chemical Vapor Deposition Diamond Coating Motivated by Graphene Oxide. Coatings. 2021; 11 (5):559.

Chicago/Turabian Style

Fan Zhou; Naichao Chen; Fasong Ju. 2021. "Enhanced Growth Rate of Chemical Vapor Deposition Diamond Coating Motivated by Graphene Oxide." Coatings 11, no. 5: 559.

Conference paper
Published: 27 January 2021 in IOP Conference Series: Earth and Environmental Science
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Poor impact resistance of diamond coating has limited its wide application. In this work, a experimental analysis was conducted to explore the effect of multilayer strategy on impact behaviour of diamond coating. Multilayer diamond coating facilitated the enhancement of impact resistance. Thereafter, four types of chemical vapor deposition coating were deposited to further verify the impact resistance of multilayer diamond coating. Scanning electron microscopy, Raman spectrometer and X-ray diffraction equipment were used to characterize the diamond coatings before and after the impact, respectively. The results showed that MCD/NCD coating had the smallest impact scar. Furthermore, it could be concluded that the multilayer strategy was beneficial for coating to improve the impact resistance.

ACS Style

Fan Zhou; Naichao Chen; Shuai Chen; Kun Wei; Ping He; Dongmei Liu; Fasong Ju. Enhancement of impact resistance of CVD diamond coating by multilayer strategy. IOP Conference Series: Earth and Environmental Science 2021, 647, 012068 .

AMA Style

Fan Zhou, Naichao Chen, Shuai Chen, Kun Wei, Ping He, Dongmei Liu, Fasong Ju. Enhancement of impact resistance of CVD diamond coating by multilayer strategy. IOP Conference Series: Earth and Environmental Science. 2021; 647 (1):012068.

Chicago/Turabian Style

Fan Zhou; Naichao Chen; Shuai Chen; Kun Wei; Ping He; Dongmei Liu; Fasong Ju. 2021. "Enhancement of impact resistance of CVD diamond coating by multilayer strategy." IOP Conference Series: Earth and Environmental Science 647, no. 1: 012068.

Journal article
Published: 19 March 2020 in Materials
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Adhesive strength of the coating significantly affects the lifetime of the coating. However, it is still inevitable for the coating, even with strong adhesive strength, to peel off from the substrate after working for a while. In this work, fatigue and wear behaviors were employed to analyze the effect on the mechanics of coating and contribute to a fundamental understanding of peeling of the coating. A small-size Co-cemented tungsten carbide drill bit was selected as the examined substrate to fabricate the diamond coating. Roughening pretreatment with a diamond slurry combined with ultrasonic vibration was performed for the substrate surface to enhance adhesive strength. Meanwhile, a diamond coating without roughening pretreatment was also fabricated for comparison. The lifetime and quality of the coating were evaluated by the drilling test. Although the diamond coating could grow on the substrates with and without roughening pretreatment, the diamond coating with roughening pretreatment possessed a higher lifetime and stronger wear resistance than that without roughening pretreatment. We found that both substrates with and without roughening pretreatment exhibited a coarse surface, whereas the roughening pretreatment could remove the original machined surface of the substrate and thus make the near surface with numerous integrated crystalline grains become the new topmost surface. This increased the contact area and surface energy of the interface, leading to the improvement of adhesive strength. Finally, fatigue strength and contact mechanics were studied to trace the changes in the stress of the diamond coating in the whole process of drilling from a theoretical point of view. We suggest that fatigue strength and contact mechanics may play vital roles on the durability and peeling of the coating.

ACS Style

Naichao Chen; Musen Liu; Ping He. Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating. Materials 2020, 13, 1402 .

AMA Style

Naichao Chen, Musen Liu, Ping He. Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating. Materials. 2020; 13 (6):1402.

Chicago/Turabian Style

Naichao Chen; Musen Liu; Ping He. 2020. "Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating." Materials 13, no. 6: 1402.