Preparation and properties of toughened yellow zirconia ceramics

Author： Zhang Peiping Wu Guoxue Chi Xioguo Wang Yujie Liu Shufeng

ISSN： 0020-1685

Source： Inorganic Materials, Vol.42, Iss.6, 2006-06, pp. : 681-683

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Abstract

To obtain the high toughness yellow ceramic, using the Y₂O₃ (5%) stabilized ZrO₂ as main starting material, Al₂O₃ as toughen reagent, NH₄VO₃, V₂O₅ as colorant, and mixed with ball mill, molded with dry press method and two times sintered. By testing the properties and structure of the ceramic, we have optimized the best technical conditions, and the mechanism of toughness and color present has been studied. The result shows that the NH₄VO₃ as colorant is better than V₂O₅, and the color is between X = 0.396–0.412 and Y = 0.402–0.390. The highest bending strength of toughened ZrO₂ ceramics is 1138 MPa, and the fracture toughness is 14.8 MPa m^1/2. The toughen mechanism is that phase transformation of ZrO₂ and the dispersion of toughen reagents, and the color causing is by the colorful ion (V⁴⁺) entered into the zirconia crystals lattice of the ceramic.