Preparation and cutting performance of ultra-smooth CVD composite diamond coated ladder-shape drilling tools

Xiang, Daohui; Guo, Zhen; Zhang, Lei; Feng, Haoren

doi:10.1016/j.diamond.2017.11.008

Cited by 13 publications

(9 citation statements)

References 23 publications

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“…To date, diamond is regarded as the hardest material in the world, which has attracted the intensive attention of scholars and engineers to adopt it as a protective coating in industrial fields [1][2][3][4]. Due to the difference in lattice parameters and coefficients of linear expansion between the substrate and coating, the structure of the coating/substrate interface is very complex and the interface shows a relatively weaker strength than the bulk materials, which leads to the most frequent occurrence of the peeling of the coating.…”

Section: Introductionmentioning

confidence: 99%

Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating

Liu

2020

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.

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Section: Introductionmentioning

confidence: 99%

Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating

Liu

2020

Materials

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“…Diamond consists of carbon atoms and has physical properties such as a low coefficient of friction [1], a high mechanical hardness of 100 GPa (75.5-111.5 GPa for diamond films), a high bulk modulus of 1.2 × 10 12 N/m 2 , a high thermal conductivity of 20 W/cm•K (10 W/cm•K for diamond films), a thermal expansion coefficient of 0.8 × 10 −6 /K, high electrical resistivity of 10 16 Ω•cm, and a high energy bandgap of 5.47 eV [2]. Diamonds are employed in technical fields to accomplish tasks such as cutting, wear resistance coatings [3], and fabricating semiconductor components [4]. To prepare synthetic diamonds, Sussmann et al used chemical vapor deposition (CVD) with methane, oxygen, and hydrogen [5] mixed in a specified ratio.…”

Section: Introductionmentioning

confidence: 99%

Effect of Nitrogen on the Growth of (100)-, (110)-, and (111)-Oriented Diamond Films

Tung

Teseng

et al. 2020

Applied Sciences

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The aim of this research is the study of hydrogen abstraction reactions and methyl adsorption reactions on the surfaces of (100), (110), and (111) oriented nitrogen-doped diamond through first-principles density-functional calculations. The three steps of the growth mechanism for diamond thin films are hydrogen abstraction from the diamond surface, methyl adsorption on the diamond surface, and hydrogen abstraction from the methylated diamond surface. The activation energies for hydrogen abstraction from the surface of nitrogen-undoped and nitrogen-doped diamond (111) films were −0.64 and −2.95 eV, respectively. The results revealed that nitrogen substitution was beneficial for hydrogen abstraction and the subsequent adsorption of methyl molecules on the diamond (111) surface. The adsorption energy for methyl molecules on the diamond surface was generated during the growth of (100)-, (110)-, and (111)-oriented diamond films. Compared with nitrogen-doped diamond (100) films, adsorption energies for methyl molecule adsorption were by 0.14 and 0.69 eV higher for diamond (111) and (110) films, respectively. Moreover, compared with methylated diamond (100), the activation energies for hydrogen abstraction were by 0.36 and 1.25 eV higher from the surfaces of diamond (111) and (110), respectively. Growth mechanism simulations confirmed that nitrogen-doped diamond (100) films were preferred, which was in agreement with the experimental and theoretical observations of diamond film growth.

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“…And the influence of texture on the adhesion strength and cutting performance of the boron doped diamond (BDD) film is analysed by an indentation test and cutting test, respectively. deposition process, all the WC-Co substrate was pretreated by Murakami's reagent and Caro's acid etching procedure to coarse the surface and remove the surface Co element [14,15]. The mixture of acetone and trimethyl borate is introduced into the vacuum reaction chamber by part of H 2 bubbling method to provide boron source and a carbon source [16,17].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and performance of boron doped textured diamond coated tool

Chen

Xiang

Feng

et al. 2019

Surface Engineering

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Boron doped diamond (BDD) film is deposited on two types of texture cemented carbide inserts by hot filament vapour deposition (HFCVD) method. The surface morphology and composition of boron doped textured diamond (BDTD) film are characterized by scanning electron microscopy and Raman spectroscopy, respectively. And the influence of different texture shape parameters on adhesion strength and cutting performance of BDTD film tools are analysed by an indentation test and milling test, respectively. The results showed that the texture has a significant effect on grain growth and quality of the diamond film. In addition, texture can further enhance the adhesion strength of diamond film. The adhesion strength of BDTD film is better than that of BDD films. Concurrently, the boron doped groove textured diamond (BDGTD) film tool has longer tool life and a better cutting performance than the other three kinds of diamond film tools due to its suitable texture shapes.

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Preparation and cutting performance of ultra-smooth CVD composite diamond coated ladder-shape drilling tools

Cited by 13 publications

References 23 publications

Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating

Influence of Adhesive Strength, Fatigue Strength and Contact Mechanics on the Drilling Performance of Diamond Coating

Effect of Nitrogen on the Growth of (100)-, (110)-, and (111)-Oriented Diamond Films

Fabrication and performance of boron doped textured diamond coated tool

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