Mechanical properties of hot-pressed ZrO2 reinforced with (W,Ti)C and Al2O3 additions

作者: Wilson Acchar , Yankel Bruno Fontes Silva , Carlos Alberto Cairo

DOI: 10.1016/J.MSEA.2009.10.005

关键词: PorosityMaterials scienceCemented carbideCeramic matrix compositeCarbideComposite materialFracture toughnessCeramicMetallurgyCubic zirconiaOxide

摘要: Abstract Carbide, oxide and nitride-reinforced ceramic composites are usually accepted as a competitive technological option for cemented carbide (WC–Co). In recent years, these materials have been studied reinforcement in composite systems with Al 2 O 3 ZrO matrix. The present study reports on the mechanical results obtained from reinforcing (W,Ti)C particles. High-purity Y-TZP commercial zirconia were mixed fixed concentration of 30 wt.% or hot-pressed argon atmosphere at 1650 °C under pressure 20 MPa 30 min. indicated that hot-pressing method produced dense samples low porosity values. X-ray diffraction pattern showed no formation new crystalline phases between matrix elements. addition particles leads to an increase hardness sintered 11.7 GPa approximately 15.2 18.7 GPa, respectively. On other hand, presence both did not significantly improve fracture toughness These suggest –(W,Ti)C by uniaxial show great potential use machining-cutting tools, owing their high good resistance.

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