Properties of Ceramics Based on Al2o3 with Admixture of Unltradispersed Powder of Al2o3 Synthesized by the Electrochemical Method

Abstract

We present the results of investigation of the regularities of sintering and properties of corundum ceramics based on alumina with admixtures of ultradispersed powder of Al₂O₃(Al₂O₃ UDP) synthesized by the electrochemical method. It is shown that, as the firting temperature and the concentration of Al₂O₃ UDP increases, we observe a regular elevation of the linear shrinkage, microhardness, and ultimate strength in bending of the ceramics (the maximum values attained at 1550°C are as follows: 27.8%, 17 GPa, and 340 MPa, respectively). The introduction of Al₂O₃ UDP makes it possible to get an apparent density of the ceramics equal to 3.87 g/cm³ even at 1550°C.