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Composite powders of nanocrystalline WC-10Co (15wt%),Y2O3 (8mol%) stabilized nanocrystalline ZrO2 (30wt%),industrial cobalt powder (4.5wt%) and submicron Al2O3 (55wt%) composite powders were fabricated by high-energy ball-milling process.The nanocomposite powders were consolidated by microwave sintering process at temperature ranged 1300℃-1550℃ for 15min,respectively.The optimum consolidation conditions,such as temperature,were researched during microwave sintering process.Vickers Hardness of the consolidated cermets was measured by using a Vickers indentation test,and density of specimens was also determined by Archimedes’ principle.Microwave sintering process could not only increase the density of Al2O3-ZrO2-WC-Co cermets and reduce the porosity,but also inhibit abnormal grain growth.
Composite powders were nanocrystalline WC-10Co (15 wt%), Y2O3 (8 mol%) stabilized nanocrystalline ZrO2 (30 wt%), industrial cobalt powder milling process.The nanocomposite powders were consolidated by microwave sintering process at temperature ranged 1300 ℃ -1550 ℃ for 15min, respectively. These optimum consolidation conditions, such as temperature, were researched during microwave sintering process. Vickers Hardness of the consolidated cermets was measured by using a Vickers indentation test, and density of specimens was also determined by Archimedes’ principle. Microwave sintering process could not only increase the density of Al2O3-ZrO2-WC-Co cermets and reduce the porosity, but also inhibit abnormal grain growth.