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Critical Analysis of Wear Mechanisms in Cemented Carbide

Article

Abstract

Wear phenomena of cemented carbide (94 wt.% WC, 6 wt.% Co) tip of conical picks have been observed by field emission scanning electron microscopy, energy dispersive x-ray spectroscopy (EDS), and x-ray diffraction analysis (XRD). The conical pick is one type of the cutters which are used to excavate soft structure like coal. It has a cone-shaped abrasive part made of cemented carbide (CC). The picks, under study, have been used for coal mining in an underground mine through a continuous miner machine. During the critical analysis of four picks, wear mechanisms are categorized into four parts, such as, cracks, cavity formation in WC grains, grinding effect, and roughness of WC surface. Through a careful examination, the cracking mechanism has been further divided into three parts. They are cracks with overlapping surfaces, crack on a large surface of CC, and cracks in WC grains. In addition, the severe crushing and tearing of WC grains have also been clearly examined. The possible causes of each wear phenomenon have been explained comprehensively. Crushing and corrosion are the two wearing processes which have severely deteriorated the condition of the CC. Corrosion has been easily identified by observing a number of pores and triangular notches in the WC surface. The oxidation of WC grains due to corrosion has been established by EDS and XRD.

Keywords

CC conical picks EDS FESEM wear mechanisms XRD 

Nomenclature

W

Tungsten

Co

Cobalt

WC

Tungsten carbide

CC

Cemented carbide

FESEM

Field emission scanning electron microscopy

EDS

Energy dispersive x-ray spectroscopy

SDD

Silicon drift detectors

nm

Nano-meter

kV

Kilo-volt

V

Volt

pA

Pico-ampere

nA

Nano-ampere

BSE

Back scattered electron

STEM

Scanning transmission electron microscopy

H

Hydrogen

S

Sulfur

O

Oxygen

Fe

Iron

Cu

Copper

Cl

Chlorine

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Copyright information

© ASM International 2015

Authors and Affiliations

  1. 1.Department of Mechanical EngineeringIndian School of MinesDhanbadIndia

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