Novel low carbon Al₂O₃-C refractories were prepared through adopting chemical vapour deposition (CVD) synthesized nano carbon decorated Al₂O₃ powder. The phase compositions, microstructures, mechanical properties and thermal shock resistance of Al₂O₃-C refractories were characterized and evaluated. The results show that the morphologies of nano carbon composites are mainly dominated by the concentration of catalyst. Specifically, the growth of MWCNTs is preferred with a Ni²⁺ concentration at 0.1 mol/L, while higher concentrations e.g. 0.3 mol/L would stimulate the formation of nano-onion like carbon. With the introduction of nano carbon decorated Al₂O₃ additives, the residual strength after thermal shock can reach 12.4 MPa, which is much higher than the 2 wt% nano carbon black containing specimens (6.4 MPa). The enhanced thermal shock resistance should be attributed to that the nano onion-like carbon reduces the cohesion between the matrix and the Al₂O₃ particles and decreases the thermal expansion coefficient.

采用化学气相沉积法（CVD）合成的纳米碳装饰的Al ₂ O ₃粉末，制备了新型的低碳Al ₂ O ₃ -C耐火材料。对Al ₂ O ₃ -C耐火材料的相组成，显微组织，力学性能和抗热震性能进行了表征和评价。结果表明，纳米碳复合材料的形貌主要由催化剂的浓度决定。具体而言，优选在Ni ²⁺浓度为0.1 mol / L的情况下生长MWCNT ，而更高的浓度（例如0.3 mol / L）会刺激像碳这样的纳米洋葱的形成。随着纳米碳装饰铝的引入₂ O ₃添加剂，热冲击后的残余强度可以达到12.4 MPa，远高于含2 wt％纳米炭黑的试样（6.4 MPa）。增强的抗热震性应归因于纳米洋葱状碳降低了基体与Al ₂ O ₃颗粒之间的内聚力并降低了热膨胀系数。