Study On Preparation And Properties Of Antistatic Ceramics Based 3Y-TZP

Antistatic materials have widespread applications in fields such as aerospace,petrochemical engineering,electronics and textile etc.At present,antistatic materials in engineering application mainly include polymer composite materials and antistatic glaze;but they can't meet the requirements of the relatively harsh environment for their poor wear-resistance,low heat resistance and high porosity respectively.Zirconia possessing outstanding heat resistance,corrosion resistance,corrosion resistance and good mechanical performance such as high hardness and fracture toughness,was widely applied.These features including extensively investigated processing routes,make zirconia be an excellent candidate of ceramic materials.The objective of this work was to prepare 3Y-TZP based antistatic ceramics with excellent mechanical properties by structure designing of the ceramic coatings and surface with four methods:high-temperature iron infiltration,solution infiltration,low vacuum carburizing and antistatic coating.XRD,SEM/EDS,XPS were employed to analyze the antistatic mechanism and change rule of surface resistivity,hardness variation of specimens thus prepared was also been investigated.Depending on diffusion theory and through the control of infiltration temperature and time,experimental results showed that the surface resistivity and hardness decreased with the increase of infiltration temperature and time,in which the surface resistivity decreased from more than 1014?/? down to 8.3×107?/?,and the hardness of ZrO2 ceramics from 12.7GPa to 11.23GPa for 4h at 1000 C.It was also found that Fe,Fe3O4 and FeO located in the interface of infiltration layer.Through controlling solution concentration,infiltration temperature and time,the thickness of green body by Fe(NO3)3 solution infiltration into the zirconia ceramics,the antistatic zirconia ceramics its surface resistivity reduced down to 3.7×106?/? and hardness had a significant decrease.The thickness of green body has a great influence on the Fe introducing but with no influence on surface resistivity and hardness.It was also found that FeO and Fe2O3 located in the infiltration layer.Under the condition of high temperature,through controlling carbon infiltration temperature and time,the surface resistivity of antistatic ceramics decreased to 5.1 × 106?/?for infiltrating at 1450? for 4h.Experimental results showed that the surface resistivity decreased,while hardness increased with the increase of infiltration temperature and time.It is also found that the coating contains ZrC0.85 and elementary substance carbon.The surface resistivity of glaze decreased to 8.0×107?/? by doping ZnO/SnO2 mixing powder.It is found that ZnO and SnO2 dissolve into the base glaze,the molten coating contains semiconductor constituent around the SnO2 crystal which mutually contacts and forms static dissipative network,that makes glaze possess antistatic property.