The effects of oxidation and alumina addition on the physical and mechanical properties of Ti/Al2O3 composites were studied. The variation in alumina addition used in this study was 0, 10, 20 and 30 wt%. The mixture of Ti and Al2O3 was prepared by semi-powder metallurgy method and then pressed and followed by sintering in air atmosphere at 1000 °C for 2 h. The present results show that the density of the sintered Ti/Al2O3 decreased with increasing alumina amount and oxidation. XRD and EDX analysis indicates that the sample free of alumina produced the oxides in the form of TiO2 on the surface of the composite. With alumina addition, the AlTiO2 oxide appears besides TiO2. This occurrence confirms that the oxidation of Ti increases with increasing the amounts of alumina. The intermetallic phase Ti3Al has appeared in the Ti/Al2O3 composites, which might be due to reduction in alumina by Ti. The oxidation of Ti/Al2O3 composites decreases the hardness and compressive yield strength and hardness values. The decrease in mechanical properties becomes more obvious with increasing the alumina amount which enhanced the formation of oxidation scales after sintering.

中文翻译：

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氧化和添加氧化铝对半粉末冶金法制备的Ti/Al2O3复合材料物理力学性能的影响

研究了氧化和氧化铝添加对Ti/Al2O3复合材料物理力学性能的影响。本研究中使用的氧化铝添加量变化为 0、10、20 和 30 wt%。Ti和Al2O3的混合物通过半粉末冶金法制备，然后压制，然后在空气气氛中在1000℃下烧结2小时。目前的结果表明，烧结的 Ti/Al2O3 的密度随着氧化铝含量和氧化程度的增加而降低。XRD 和 EDX 分析表明，不含氧化铝的样品在复合材料表面产生了 TiO2 形式的氧化物。添加氧化铝后，除了 TiO2 之外，还会出现 AlTiO2 氧化物。这种情况证实了 Ti 的氧化随着氧化铝含量的增加而增加。Ti/Al2O3 复合材料中出现了金属间相 Ti3Al，这可能是由于 Ti 减少了氧化铝。Ti/Al2O3 复合材料的氧化降低了硬度和压缩屈服强度以及硬度值。随着氧化铝用量的增加，力学性能的下降更加明显，这促进了烧结后氧化皮的形成。