Stable tetragonal zirconia ceramics material of manganese oxide and method of preparing the same

Abstract

The invention provides a tetragonal zirconia ceramic material with stable manganese oxide and a preparation method thereof. The ceramic material takes the zirconium oxide as a substrate and takes the transition metal oxide manganese oxide as a stabilizing agent. The preparation method comprises the steps as follows: the weighed mixed powder of the zirconium oxide and manganese oxide is poured into a mortar and fully ground and mixed; the powder is pressed into ceramic sheets with certain shapes by adopting a unidirectional dry press method under the pressure of 8 to 10MPa; the ceramic sheets are put into a high temperature pipe furnace to be sintered, wherein, a heat treatment regime is that the heating rate is less than 300 DEG C per hour, heat preservation is carried out for 12 to 24 hours in the argon atmosphere at 1,300 to 1,400 DEG C and the cooling is carried out on the ceramic sheets along with the furnace. The method is simple in process and low in cost. The tetragonal zirconia ceramic is prepared by a solid sintering process; the material obtained has good stability, is an excellent structural ceramic material and a solid electrolyte material and is beneficial to the application and popularization of the novel zirconia ceramic material.

Description

Technical field [0001] The invention relates to a manganese oxide stabilized tetragonal zirconia ceramic material and a preparation method thereof, and belongs to the technical field of zirconia-based ceramics. Background technique [0002] Zirconia (ZrO 2 ) Ceramics have a high melting point and good chemical stability, and they have been paid attention to by researchers since the 1970s. At different temperatures, zirconia mainly exists in three isoforms, namely the monoclinic system (m-ZrO 2 ), tetragonal system (t-ZrO 2 ) And cubic system (c-ZrO 2 ). Pure ZrO 2 During the sintering and cooling process, the martensitic transformation from tetragonal phase to monoclinic phase is accompanied by a 3% to 5% volume change, which leads to easy cracking of the material, which limits the application of zirconia bulk materials in engineering. [0003] In order to eliminate the volume change caused by the phase change, the study found that the pure ZrO 2 Adding a stabilizer to the sinter...

AI Technical Summary

Problems solved by technology

However, the study found that Y 2 o 3 Stable ZrO 2 When (YSZ) is used for a long time in the low temperature range of 100-400 ° C, the surface of the material undergoes an isothermal phase transition from tetragonal phase to monoclinic phase, resulting in a sharp decline in mechanical properties, that is, low temperature performance aging

CeO 2 Stable ZrO 2 It has high fracture toughness and good low temperature hydrothermal aging resistance, but the disadvantage is low hardness and strength

But most Sc 2 o 3 -ZrO 2 materials, due to the formation of metastable phases in the sintering process, the conductivity will drop rapidly and the stability is very poor