ABSTRACT

The paper studies the structural features, phase composition and complex mechanical properties of two-layer composite ceramics based on alumina-toughened zirconia with silica added (Ca-ATZ/Ca-ATZ+SiO₂). The ceramics under study were manufactured using a cost-effective technology involving grinding and mixing powders, layering of powder mixtures (different compositions), uniaxial pressing and two-stage sintering. It was found that at the interface of the compositions, there is an abrupt increase in fracture toughness (by 33%) and a decrease in hardness and Young’s modulus (by 8% and 7%, respectively). The possibility of manufacturing composite ceramics Ca-ATZ+SiO₂ (with a thin surface layer, not containing SiO₂) with a high ratio of hardness (not lower than 14 GPa) and fracture toughness (not lower than 12 MPa m^1/2) was shown. Given the increased resistance to low-temperature degradation of the developed ceramics, this will increase the service life of products operated under high mechanical loads in a humid atmosphere.

摘要

_{该论文研究了基于添加二氧化硅的氧化铝增韧氧化锆（Ca-ATZ/Ca-ATZ+SiO 2}）的双层复合陶瓷的结构特征、相组成和复杂的力学性能。正在研究的陶瓷是使用具有成本效益的技术制造的，该技术涉及研磨和混合粉末、粉末混合物（不同成分）的分层、单轴压制和两阶段烧结。发现在组合物的界面处，断裂韧性突然增加（增加 33%），硬度和杨氏模量减少（分别减少 8% 和 7%）。_{制造复合陶瓷Ca-ATZ+SiO 2}的可能性（表层较薄，不含SiO ₂) 具有较高的硬度比（不低于 14 GPa）和断裂韧性（不低于 12 MPa m ^1/2）。鉴于开发的陶瓷具有更高的抗低温降解性，这将增加在潮湿大气中高机械负载下运行的产品的使用寿命。