Download PDFOpen PDF in browser

Molecular Dynamics Investigation of Polytetrafluoroethylene Coating on Al2O3/Cr2O3/Ti2O3 for Cavitation Erosion Mitigation in Water Hydraulics Valves

EasyChair Preprint no. 1944

6 pagesDate: November 13, 2019

Abstract

Impairment caused by cavitation erosion and abrasive wear in valves is a significant problem for water hydraulic machinery in both underwater and industrial application. Material chemistry plays a major role in eliminating this cavitation erosion phenomenon. A Coating study of polytetrafluoroethylene (PTFE) on (1 0 0), (0 1 0) and (0 0 1) surface of  Al2O3, Cr2O3 and Ti2O3 using molecular dynamics (MD) simulation that was conducted by Materials Studio (MS) discover code under similar initial conditions. PTFE layer was set on the cleaved planes (1 0 0) and (0 1 0) was more likely absorbed firmly on the surface of Al2O3 powder than that of Cr2O3 and Ti2O3 simply because of the binding energy of PTFE/Al2O3 being larger than that of PTFE/Cr2O3 and PTFE/Ti2O3. It has been studied that the composite coating of the PTFE on the (0 1 0) surface of Al2O3  became harder compared with PTFE/Al2O3 cleaved along (1 0 0) plane and PTFE/Cr2O3 cleaved along (0 0 1) plane in the magnitude order of 3188.006 > 1882.626 >1364.538 kJ/mol. The PTFE interacts mainly through electrostatic force in all (1 0 0), (0 1 0) and (0 0 1) surface of Al2O3. Meanwhile, it was observed that the PTFE adsorbed mainly with the use of electrostatic force on (1 0 0), (0 0 1) surface of Cr2O3, and (0 1 0) surface of Cr2O3 dominated by Van der Waals’force. In this work, concluded that the greater the binding energy the higher the hardness that mighty absorbs bubbles’ imploding energies, hence mitigating the valve cavitation damage at a certain threshold value.

Keyphrases: binding energy, Cavitation erosion, coating, erosion resistance, Hardness, molecular dynamics, Water Hydraulics

BibTeX entry
BibTeX does not have the right entry for preprints. This is a hack for producing the correct reference:
@Booklet{EasyChair:1944,
  author = {Masoud Kamoleka Mlela and He Xu and Haihang Wang and Vishwanath Pooneeth},
  title = {Molecular Dynamics Investigation of Polytetrafluoroethylene Coating on Al2O3/Cr2O3/Ti2O3 for Cavitation Erosion  Mitigation in Water Hydraulics Valves},
  howpublished = {EasyChair Preprint no. 1944},

  year = {EasyChair, 2019}}
Download PDFOpen PDF in browser