Continuous alumina fiber-reinforced yttria-stabilized zirconia (YSZ) composites with a LaPO₄ fiber coating were fabricated by slurry infiltration and spark plasma sintering (SPS). The LaPO₄ coating was deposited on the reinforcement alumina fabrics by a modified sol-gel method. The YSZ slurry with good dispersion and stability was prepared by optimizing the pH value, dispersant addition and ball milling time. The fabricated composite with a high density of ∼ 92 % has a good flexural strength of 277 ± 43 MPa, and a superior fracture toughness of 15.93 ± 0.75 MPa·m^1/2 exhibiting a non-brittle failure behavior. It was found that the LaPO₄ coating reduced the residual stress near the fiber/matrix interface to 131 ± 41 MPa, which was 369 ± 63 MPa in the composite without the fiber coating. The LaPO₄ coating renders a weak interphase to improve the composite toughness by activating several toughening mechanisms including crack deflection, fiber debonding and pullout, and delamination behavior.

通过浆料浸渗和电浆等离子体烧结（SPS），制备了具有LaPO ₄纤维涂层的连续氧化铝纤维增强的氧化钇稳定的氧化锆（YSZ）复合材料。通过改进的溶胶-凝胶法将LaPO ₄涂层沉积在增强氧化铝织物上。通过优化pH值，添加分散剂和球磨时间，制备了具有良好分散性和稳定性的YSZ浆料。所制成的高密度〜92％的复合材料具有277±43 MPa的良好抗弯强度，以及15.93±0.75 MPa·m ^1/2的优异断裂韧性，表现出非脆性破坏行为。发现LaPO ₄涂层将纤维/基体界面附近的残余应力降低到131±41 MPa，在没有纤维涂层的复合材料中为369±63 MPa。LaPO ₄涂层通过激活几种增韧机制（包括裂纹偏转，纤维脱粘和拉拔以及脱层行为），提供了弱的中间相，从而提高了复合材料的韧性。