OBJECTIVES This study evaluates the difference in physical and mechanical properties of ZrO2 ceramics, commonly used in dental applications, altered by three different forms of Al2O3 content; microparticles (m), nanoparticles (n), and microfiber (f). METHODS Three different types of ZrO2-Al2O3 composites were formed using microparticle (m), nanoparticle (n), or microfibre (f) forms of Al2O3. The physical and mechanical properties such as sintering shrinkage, relative density, Vickers hardness, fracture toughness, and biaxial strength were evaluated. A Weibull analysis was performed to assess the strength reliability of the specimens. All data were calculated using the t-test and ANOVA. RESULTS The sintering shrinkage and relative density of all ceramic composite groups were decreased with the addition of Al2O3. The mechanical properties of ZrO2-Al2O3 (f) composite were higher than that of ZrO2-Al2O3 (m) composite and ZrO2-Al2O3 (n) composite. The maximum hardness, fracture toughness, and biaxial flexural strength were observed for 10 vol% of Al2O3 fibre. When the content of Al2O3 fibre in the matrix was increased above 20 vol%, agglomeration occurred and resulted in a decrease of hardness and toughness. The Weibull modulus value of the ZrO2-Al2O3 (f) composite was the lowest compared to that of other groups. However, characteristic strength (σ0) of ZrO2-Al2O3 (f) the highest value. SIGNIFICANCE The current study demonstrated that the addition of right amount of Al2O3 microfibre into the ZrO2 matrix enhanced the mechanical properties of ZrO2-Al2O3 (f) composite, which would be favourable for dental applications.

中文翻译：

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通过改变Al2O3的形式增强ZrO2-Al2O3牙科陶瓷复合材料的机械性能。

目的本研究评估了常用于牙科应用的ZrO2陶瓷的物理和机械性能的差异，该差异被三种不同形式的Al2O3含量改变了。微粒（m），纳米微粒（n）和超细纤维（f）。方法使用微粒（m），纳米微粒（n）或微纤维（f）形式的Al2O3形成三种不同类型的ZrO2-Al2O3复合材料。评价了诸如烧结收缩率，相对密度，维氏硬度，断裂韧性和双轴强度的物理和机械性能。进行了威布尔分析以评估样品的强度可靠性。所有数据均使用t检验和ANOVA计算。结果随着Al 2 O 3的加入，所有陶瓷复合材料组的烧结收缩率和相对密度均降低。ZrO2-Al2O3（f）复合材料的机械性能高于ZrO2-Al2O3（m）复合材料和ZrO2-Al2O3（n）复合材料。对于10体积％的Al 2 O 3纤维，观察到最大硬度，断裂韧性和双轴弯曲强度。当基体中Al 2 O 3纤维的含量增加到20vol％以上时，发生附聚并且导致硬度和韧性降低。与其他组相比，ZrO2-Al2O3（f）复合材料的威布尔模量值最低。但是，ZrO 2 -Al 2 O 3（f）的特征强度（σ0）最高。意义当前的研究表明，向ZrO2基体中添加适量的Al2O3超细纤维可增强ZrO2-Al2O3（f）复合材料的机械性能，这对于牙科应用将是有利的。