0
research-article

The wear and friction characters of polycrystalline diamond under wetting conditions

[+] Author and Article Information
Liu Chun

IoT Perception Mine Research Center, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China
lccumt@163.com

Man Zhongyi

Key laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China
CUMT_MZY@163.com

Zhou Fubao

Key laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China; National Engineering Research Center for Coal Gas Control, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China
zfbcumt@gmail.com

Kai Chen

School of Materials Science and Engineering, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China
cumtck@cumt.edu.cn

Yu Haiyang

Key laboratory of Gas and Fire Control for Coal Mines, China University of Mining & Technology (CUMT), Xuzhou, Jiangsu 221116, China
375738082@qq.com

1Corresponding author.

ASME doi:10.1115/1.4041397 History: Received November 02, 2017; Revised September 04, 2018

Abstract

Polycrystalline Diamond Compacts (PDC) are the main cutting unit of drill bits and are a major factor in determining the drilling efficiency and service life of drill bits. Drill bit failure is caused by the severe abrasive wear it undergoes during the drilling process. The drill bit failure can prolong the drilling period, which can result in borehole instability and cause collapse in the material. A solution that can address this issue is developing an appropriate drilling method that can expel the dust in a manner that will not increase the abrasive wear on the drill bit. Here, an Amsler friction and wear-testing machines was used to investigate the friction and wear characteristics of PDC and to study the effects of the dust expelled during drilling on the wear performance of drill bits under dry air and wetting conditions. The microstructures of the worn surfaces were examined by a scanning electron microscope and metalloscope. In addition, the chemical compositions of the PDCs' surfaces were analyzed using X-Ray diffraction after the wear and friction tests. The results demonstrate that the friction coefficients and wear rate obtained in dry air were higher than those under wetting conditions. As expected, these values are mainly ascribed to the absence of the absorber layer and lubrication under dry air. Furthermore, under wetting conditions a number of cracks were observed on the PDC surface after testing at 700°C, which was mainly caused by two factors: The different thermal expansion coefficients between the diamond and Cobalt phase; and the residual stress generated inside the PDC under wetting conditions.

Copyright (c) 2018 by ASME
Your Session has timed out. Please sign back in to continue.

References

Figures

Tables

Errata

Some tools below are only available to our subscribers or users with an online account.

Related Content

Customize your page view by dragging and repositioning the boxes below.

Related Journal Articles
Related eBook Content
Topic Collections

Sorry! You do not have access to this content. For assistance or to subscribe, please contact us:

  • TELEPHONE: 1-800-843-2763 (Toll-free in the USA)
  • EMAIL: asmedigitalcollection@asme.org
Sign In