Sintering of alumina from 1500°C to 1650°C and tribo‐mechanical properties at room temperature had been investigated using nano CuO as a sintering aid. Bulk density gradually increases with sintering temperature from 1500°C to 1600°C and is optimized at 1600°C, beyond this, bulk density does not significantly increase at 1650°C. The addition of 2 wt% CuO showed the best result on densification. Densification of about 97.74% was attained at 1600°C with the incorporation of 2 wt% CuO. Nano CuO at grain boundaries forms CuAl₂O₄ liquid which modifies the morphology of the grain and improves mechanical properties. The formation of self‐lubricating tribo‐film on the wear track results in a low coefficient of friction <0.2 and reduces specific wear rate. 4 wt% CuO addition increases contact tensile stress (σ_max) by 51.2% and high Hertzian contact pressure (P_max≈1.51 GPa) causes plastic deformation of wear track. The re‐solidified strengthening bond phase on the wear track simultaneously increases in friction coefficient and wear resistance with CuO addition. The optimizing effect of CuO addition shows that 2 wt% significantly decreases wear rate, and increases hardness and fracture toughness.

中文翻译：

---

纳米CuO对非共形接触中氧化铝陶瓷摩擦力学行为的影响

使用纳米CuO作为烧结助剂，研究了从1500°C到1650°C的氧化铝烧结和室温下的摩擦机械性能。堆密度随着烧结温度从1500°C到1600°C逐渐增加，并在1600°C进行了优化，除此之外，堆密度在1650°C不会显着增加。添加2 wt％的CuO在致密化方面显示出最好的结果。通过掺入2wt％的CuO，在1600℃达到约97.74％的致密化。晶界处的纳米CuO形成CuAl ₂ O ₄液体，可改变晶粒的形态并改善机械性能。在磨损轨道上形成自润滑摩擦膜会导致<0.2的低摩擦系数并降低比磨损率。4重量％的CuO除了增加接触的拉伸应力（σ_最大）51.2％，高赫兹接触压力（P_最高≈1.51GPa）的引起磨损痕迹的塑性变形。添加CuO后，磨损道上重新凝固的强化结合相同时增加了摩擦系数和耐磨性。CuO添加量的优化效果表明2 wt％会显着降低磨损率，并增加硬度和断裂韧性。