Liquid phase sintering additive for tetragonal polycrystalline zirconia ceramic material and preparation and application thereof

Abstract

The invention discloses a liquid phase sintering additive for a tetragonal polycrystalline zirconia ceramic material and preparation and application methods thereof. The additive consists of a stabilizing agent and a flux, wherein the stabilizing agent is yttrium oxide; the flux is calcium-aluminium-silicon-based glass powder consisting of 40 to 50 weight percent of SiO2, 5 to 15 weight percent of CaO, 20 to 30 weight percent of Al2O3, 5 to 15 weight percent of Na2O and 10 to 20 weight percent of B2O3; and the mass ratio of the stabilizing agent to the flux is 2-5:4-6. In the sintering additive, the addition amount of the stabilizing agent accounts for 2 to 5 percent of the matrix zirconia material, and the addition amount of the glass flux accounts for 4 to 6 percent of the matrix zirconia material; under the condition of preparing the TZP material with high toughness and high chemical stability, a zirconia liquid phase sintering mechanism can be formed, the firing temperature is greatly reduced, the sintering temperature of the TZP material added with the additive is 1,400+ / -30DEG C and the breaking strength is more than 400MPa.

Description

technical field [0001] The invention relates to the technical field of zirconia ceramic sintering, in particular to a liquid-phase sintering additive for a tetragonal polycrystalline zirconia (TZP) ceramic material and a preparation and application method thereof. Background technique [0002] Zirconia ceramics have higher strength, toughness and corrosion and wear resistance than alumina, and are widely used in metallurgy, chemical industry, machinery, electronics, petroleum and other fields. Because of their unique stress-induced martensitic transformation toughening characteristics, Also known as ductile ceramics. [0003] Zirconia has three stable polycrystals, namely monoclinic phase (m), tetragonal phase (t) and cubic phase (c), and the phase transition from t phase to m phase changes to martensitic phase transformation, accompanied by 8% High shear strain and 3-5% volume expansion, so pure zirconia products will crack during cooling and cannot be used directly. In v...

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Problems solved by technology

[0004] There are two sintering methods commonly used for TZP materials: solid-phase sintering and liquid-phase sintering. When solid-phase sintering is used, the sintering temperature is about 1600°C, the energy consumption is high, the requirements for sintering equipment are strict, and the final cost of the product is high, which limits its use. widely used

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