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首页> 外文期刊>Materials Science and Engineering >The phase stability and toughening effect of 3Y-TZP dispersed in the lanthanum zirconate ceramics
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The phase stability and toughening effect of 3Y-TZP dispersed in the lanthanum zirconate ceramics

机译：分散在锆酸镧陶瓷中的3Y-TZP的相稳定性和增韧效果

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摘要

The low fracture toughness of lanthanum zirconate (La_2Zr_2O_7, LZ) greatly impedes its wide application as thermal barrier coatings (TBC). The 3 mol% Y_2O_3-stabilized tetragonal zirconia polycrystals (3Y-TZP) have been introduced to toughen the brittle LZ ceramics. The dispersive 3Y-TZP undergoes a simultaneous t-m transformation upon cooling below a critical volume fraction x of 3Y-TZP, above which its tetragonal phases can however be preserved. The different stabilities of 3Y-TZP second phases arise from a variation of residual tensile stress within them. The fracture toughness has been greatly improved by dispersing the tetragonal particulates (t-3YSZ) in the LZ matrix and the primary toughening mechanisms are phase transformations of the dispersive second phases and the residual compressive stress within the matrix. An anticipated increase of fracture toughness from the ferroelastic toughening and the residual compressive stress toughening highlights the great potentials to improve coating durability by depositing t′-3YSZ/LZ composite TBCs by the industrial non-equilibrium route.
机译：锆酸镧（La_2Zr_2O_7，LZ）的低断裂韧性极大地阻碍了其作为热障涂层（TBC）的广泛应用。引入了3 mol％的Y_2O_3稳定的四方氧化锆多晶体（3Y-TZP）以增韧脆性的LZ陶瓷。分散的3Y-TZP在冷却至3Y-TZP的临界体积分数x以下时会同时发生t-m转变，但在此之上可以保留其四方相。 3Y-TZP第二相的不同稳定性是由它们内部残余拉应力的变化引起的。通过将四方颗粒（t-3YSZ）分散在LZ基体中，可以大大提高断裂韧性，主要的增韧机理是分散的第二相的相变和基体内的残余压应力。铁弹性增韧和残余压缩应力增韧带来的断裂韧度的预期增加，突出了通过工业非平衡途径沉积t'-3YSZ / LZ复合TBC改善涂层耐久性的巨大潜力。

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