The chemical compatibility of a series of rare earth apatite (RE-apatite), with Y₂O₃-stabilized ZrO₂ (YSZ) has been investigated. Three types of RE-apatite powders with different ionic radius (RE = Gd, Nd and La) were prepared, and bulks prepared from the powder mixtures of RE-apatite and YSZ were heat-treated at 1300 °C up to 100 h in this study. It was found that Gd-apatite reacted with YSZ and formed a reaction layer (Gd₂Si₂O₇) at the Gd-apatite/YSZ interface. Meanwhile, the intense Gd³⁺ diffusion resulted in the formation of Gd solid solutions in YSZ and much YSZ phase transformation. In contrary, as for Nd- or La-apatite/YSZ composite, which has larger ionic radius, no reaction product was observed at interface and there was less RE diffusion into YSZ as well as YSZ transformation. These results clearly indicated that large ionic radius of RE³⁺ could enhance the chemical compatibility of RE-apatite with YSZ.

研究了一系列稀土磷灰石（RE-磷灰石）与Y ₂ O ₃稳定的ZrO ₂（YSZ）的化学相容性。制备了三种离子半径不同的稀土磷灰石粉末（RE = Gd，Nd和La），并在1300°C至100 h的温度下对由稀土磷灰石和YSZ粉末混合物制得的块料进行了热处理。研究。发现Gd-磷灰石与YSZ反应并在Gd-磷灰石/ YSZ界面处形成反应层（Gd ₂ Si ₂ O ₇）。同时，强烈的Gd ³⁺扩散导致YSZ中Gd固溶体的形成和许多YSZ相变。相反，对于具有较大离子半径的Nd-或La-磷灰石/ YSZ复合材料，在界面处未观察到反应产物，并且RE扩散入YSZ以及YSZ的转化较少。这些结果清楚地表明，大的RE ³⁺离子半径可以增强RE-磷灰石与YSZ的化学相容性。