Fabrication of Al_2O_3-ZrO_2 Nano-Ceramics by HIP

Co-precipitation methods were used to produce 20 mol% Al2O3-ZrO2 powder, from aqueous solutions of zirconium oxychloride and aluminium chloride, followed by precipitation with ammonia. The resulting gel was calcined at 750℃. The prepared powder was sintered at 1000℃ for 1 h under 200 MPa by using the hot isostatic pressing technique. TEM micrograph showed thatthe average grain size of the sintered body was only about 50 um. XRD analysis on the polished surface indicated the phase composition of the nano-ceramics was 55% t-ZrO2-39% m-ZrO2-6% a-Al2 O3.