Nano-Scale Fatigue Wear of Carbon Nitride Coatings: Part I—Wear Properties

2003 ◽  
Vol 125 (2) ◽  
pp. 430-436 ◽  
Author(s):  
Dong F. Wang ◽  
Koji Kato
Keyword(s):  
Carbon Nitride ◽  
Wear Track ◽  
Wear Particles ◽  
Nitride Coating ◽  
Wear Properties ◽  
Mode Change ◽  
Nitride Coatings ◽  
Wear Mode ◽  
In Situ Examination

This paper, the first of two companion papers, reports empirical data on wear properties in carbon nitride coatings by a spherical diamond counter-face in repeated sliding contacts through in situ examination and post-sliding observation, with an emphasis on the effects of friction cycles and normal load. In the repeated sliding, a specific wear amount of about 10−9mm3/Nm was observed on the wear track of the carbon nitride coating when no wear particles were detected. On the other hand, a specific wear amount of about 10−6mm3/Nm was observed on the wear track of the carbon nitride coating, where wear particles were generated after a certain number of friction cycles. Wear rate change corresponds to a wear mode change. From in situ examination, the critical number of friction cycles, Nc, for wear particle generation is proven to be related to a wear mode change.

Nano-Scale Fatigue Wear of Carbon Nitride Coatings: Part II—Wear Mechanisms

2003 ◽  
Vol 125 (2) ◽  
pp. 437-444 ◽  
Author(s):  
Dong F. Wang ◽  
Koji Kato
Keyword(s):  
Wear Mechanisms ◽  
Carbon Nitride ◽  
Low Cycle Fatigue ◽  
Surface Flow ◽  
Theoretical Expression ◽  
Asperity Contact ◽  
Wear Particles ◽  
Critical Number ◽  
Fatigue Wear ◽  
Nitride Coatings

This is the second part of two companion papers, the first of which reported the empirical data on wear properties in carbon nitride coatings by a spherical diamond counter-face in repeated sliding contacts through in situ examination, with an emphasis on the effect of friction cycles and normal load. The second part will concentrate on wear mechanisms for the transition from “No observable wear particles” to “Wear particle generation.” The relationship between the critical number of friction cycles, Nc, and the representative plastic strain, Δεp, at asperity contact region was confirmed to follow the Manson-Coffin equation with two empirical constants, β and C. The observed generation of wear particles in carbon nitride coatings is therefore concluded to be a low cycle fatigue wear by surface flow and surface delamination in the ploughing mode. For further predicting lifespan, a simplified theoretical expression, combining the Manson-Coffin equation with the analytical solution of a proposed elastic perfectly-plastic indentation model, gives the relation between the critical number of friction cycles, Nc, and the coating thickness h, with respect to the contact pressure P, and the radius R of the asperity on the tip of the diamond pin.

Achieving Enhanced Mechanical Properties and Analysis of Chemical Kinetics of the In Situ Reaction in an Al-TiB2 In Situ Composite

2010 ◽  
Vol 129-131 ◽  
pp. 1385-1388 ◽  
Author(s):  
R. Shobha ◽  
K.R. Suresh ◽  
H.B. Niranjan ◽  
Kestur Gundappa Satyanarayana
Keyword(s):  
Chemical Kinetics ◽  
Wear Track ◽  
Volume Fraction ◽  
Base Alloy ◽  
Lower Amount ◽  
Volume Loss ◽  
Wear Properties ◽  
Tib2 Particles ◽  
Kinetics Of

The aim of this paper is to prepare an in-situ composite of 6061 TiB2 particles using vortex method and study the chemical kinetics of the ongoing in-situ reaction by X-ray diffraction (XRD) technique. In addition, it is characterized for its mechanical and wear properties. XRD studies indicated that the reinforcement was formed only at the later stages after a prolonged stirring. The tensile strength of the composite was found to enhance by 57.58% at 6% TiB2, while hardness by 47.3% at 12 % TiB2. The composites showed decreasing volume loss with increasing TiB2 content with all the composites exhibiting lower volume loss compared to that of the base alloy. On the other hand, the volumetric wear showed a decreasing trend with increasing volume fraction of reinforcement and the sliding distance. These results are explained using scanning electron microscopy, which showed more debris on the wear track of the composite having lower amount of TiB2, while with increasing TiB2 reinforcement, the composite showed more even wear track with lower amount of debris.

Micro-wear properties of carbon nitride coatings

Wear ◽  
2000 ◽  
Vol 238 (1) ◽  
pp. 40-44 ◽  
Author(s):  
Koji Kato ◽  
Hiroyuki Koide ◽  
Noritsugu Umehara
Keyword(s):  
Carbon Nitride ◽  
Wear Properties ◽  
Nitride Coatings

scholarly journals Carbon Nitride Quantum Dots Modified TiO2 Inverse Opal Photonic Crystal for Solving Indoor VOCs Pollution

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 464
Author(s):  
Jie Yu ◽  
Angel Caravaca ◽  
Chantal Guillard ◽  
Philippe Vernoux ◽  
Liang Zhou ◽  
...  
Keyword(s):  
Quantum Dots ◽  
Carbon Nitride ◽  
Sol Gel ◽  
Green Energy ◽  
Inverse Opal ◽  
Oxidation Reactions ◽  
Composite Photocatalyst ◽  
Colloidal Photonic Crystals ◽  
Inverse Opal Structure

Indoor toxic volatile organic compounds (VOCs) pollution is a serious threat to people’s health and toluene is a typical representative. In this study, we developed a composite photocatalyst of carbon nitride quantum dots (CNQDs) in situ-doped TiO2 inverse opal TiO2 IO for efficient degradation of toluene. The catalyst was fabricated using a sol-gel method with colloidal photonic crystals as the template. The as-prepared catalyst exhibited excellent photocatalytic performance for degradation of toluene. After 6 h of simulated sunlight irradiation, 93% of toluene can be converted into non-toxic products CO2 and H2O, while only 37% of toluene is degraded over commercial P25 in the same condition. This greatly enhanced photocatalytic activity results from two aspects: (i) the inverse opal structure enhances the light harvesting while providing adequate surface area for effective oxidation reactions; (ii) the incorporation of CNQDs in the framework of TiO2 increases visible light absorption and promotes the separation of photo-generated charges. Collectively, highly efficient photocatalytic degradation of toluene has been achieved. In addition, it can be expanded to efficient degradation of organic pollutants in liquid phase such as phenol and Rhodamine B. This study provides a green, energy saving solution for indoor toxic VOCs removal as well as for the treatment of organic wastewater.

scholarly journals Carbon nitride nanotubes with in situ grafted hydroxyl groups for highly efficient spontaneous H2O2 production

2021 ◽  
Vol 288 ◽  
pp. 119993
Author(s):  
Liang Zhou ◽  
Juying Lei ◽  
Fuchen Wang ◽  
Lingzhi Wang ◽  
Michael R. Hoffmann ◽  
...  
Keyword(s):  
Carbon Nitride ◽  
H2o2 Production ◽  
Hydroxyl Groups ◽  
Highly Efficient

Photocatalytic degradation of tetracycline under visible light using TiO2@sulfur doped carbon nitride nanocomposite synthesized via in-situ method

2021 ◽  
Vol 9 (4) ◽  
pp. 105560
Author(s):  
Krishnan Divakaran ◽  
Amanulla Baishnisha ◽  
Vellaichamy Balakumar ◽  
Krishnan Nattamai Perumal ◽  
Chandran Meenakshi ◽  
...  
Keyword(s):  
Visible Light ◽  
Photocatalytic Degradation ◽  
Carbon Nitride ◽  
In Situ Method
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