简介:Like most carbide-based composites, the two main characteristics of alumina–tungsten carbide (Al2O3–WC) composites are high hardness
and high wear resistance. These features confer the composites important engineering a简介:Like most carbide-based composites, the two main characteristics of alumina–tungsten carbide (Al2O3–WC) composites are high hardness
and high wear resistance. These features confer the composites important engineering applications, in particular when they are used as cutting
tools. The present research involved a study of Al2O3–WC nanometric powders obtained through reactive milling. In this process, high-energy
milling promotes the reaction in a mixture of reactive powders. The material was milled in a high-energy SPEX 8000 Mixer/Mill, using WO3,Al
and C precursor powders. The highly exothermic self-propagating high-temperature synthesis (SHS) type reaction was self-sustained, producing
a temperature peak that was detected by a thermocouple attached to the external surface of the vessel. Using stoichiometric proportions of the
reagents to reduce theWO3 and to obtainWC, and adding Al2O3 as diluent, the SHS reaction occurred up to a limit of 0.8mols of diluent, forming
not only alumina but also aW2C mixture with littleWC. To obtain onlyWC it was required the addition of more than 0.8mols of C, which indicates
that the reaction may have occurred through a gaseous phase reaction mechanism.详细>