Wear resistance of ultra-coarse WC-WCoB-Co cemented carbide at different oxidation stages
Source abstract
Abstract
In this work, WCoB was introduced into ultra-coarse cemented carbides for improving the oxidation- and wear-resistance at elevated temperatures. At the initial oxidation stage, WCoB addition had a slight effect on the oxidation rate, but enhanced the wear resistance obviously by restraining the WC grains from pull-out and fracture as the Co binder phase was preferentially removed during the wear process. At the rapid oxidation stage, the wear rate of the WCoB-containing cemented carbide was drastically decreased compared to that of the straight WC-Co. The wear of the cemented carbide was mainly caused by the removal of the oxide layer and the spalling of materials under the surface layer. WCoB inhibited the oxidation and enhanced the wear resistance of the ultra-coarse cemented carbides by forming liquid B 2O 3 in the oxidation layer and sharing the stress with WC matrix before oxidation.
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