Study On Preparation And Liquid-solid Two-phase Flow Erosion Behavior Of ZrO₂-SiC-Al₂O₃ Ceramics

Zr O2 ceramic wear resistance is superior to alumina ceramic, it has a broadapplication prospect in wear-resistant materials and downhole drilling tools orequipment. Zr O2 ceramic is one of the best mechanical properties in ceramic material.But the preparation costs of Zr O2 ceramic is higher than Al2O3 ceramics, and thematerial for downhole tools and drilling equipment are under high temperature andhigh pressure environment for a long time, it must have good thermal shock stability,so introducing thermal shock stability of Si C fiber or whisker material into thepreparation of Zr O2 wear-resisting ceramics, and introducing a small amount of lowcost Al2O3 materials to prepare a new type of Zr O2-Si C-Al2O3 wear-resisting ceramicswill have more excellent comprehensive performance.Zircon carbon thermal reduction preparation of Zr O2-Si C powder as raw material,introduced a small amount of Al2O3 materials to prepare Zr O2-Si C-Al2O3wear-resisting ceramics samples. Study on the influence of erosion wear performanceof the ceramics with the amount of Al2O3, and the influence of erosion time anderosion types of particles on the material liquid solid two phase flow erosion wearbehavior and the mechanisms of the liquid-solid two phase flow erosion wear ofZr O2-Si C-Al2O3 wear-resisting ceramics.Research shows that the YSZ-Si C composite material has the largest volumedensity and minimum porosity when the temperature is 1450 °C. The maximumvolume density is 3.47 g/cm3, its smallest porosity rate is 24.46%. The maximumflexural strength of YSZ-Si C is 85.09 MPa(sintering temperature is 1400 °C), thelargest fracture toughness is 1.5 MPa·m1/2(sintering temperature is 1450 °C), thelargest vickers hardness is 2.29 GPa(sintering temperature is 1400 °C).The bending strength of Zr O2-Si C-Al2O3 wear-resisting ceramics is low when thesintering temperatures are 1300 ℃ and 1350 ℃. When the temperature is 1400 ℃, theceramics with 5% Al2O3 has the largest flexural strengths of 192.88 MPa, when thetemperature continues to rise, the flexural strength goes down. The fracture toughnessis low when the sintering temperature is 1300 ℃, with sintering temperatures increase,fracture toughness rises fast, the fracture toughness is between 1 ~ 4 MPa·m1/2 whenthe temperature of 1400 ℃. The vickers hardness is low when the sinteringtemperatures rise from 1300 ℃ to 1350 ℃, when the temperature rises to 1400 ℃, thehardness is between 2~6 GPa.The Zr O2-Si C-Al2O3 wear-resisting ceramics prepared by the Zr O2-Si C powderfrom zircon carbon thermal reduction has excellent liquid-solid two phase flowerosion wear resistance. Erosion resistance in different medium sort: quartz sandmud > silicon carbide sand mud. Erosion particle hardness has big erosion damage.Zr O2-Si C-Al2O3 wear-resisting ceramics erosion rate increased rapidly in the first twohours. With the extension of time to 24 hours the erosion rate becomes steady. Underthis experiment conditions, the Zr O2-Si C-Al2O3 wear-resisting ceramics adding 5 wt%Al2O3 has the best liquid-solid two phase flow erosion wear resistance performance.