分散剂对氧化锆浆料和烧结坯片性能的影响

Effect of dispersant on properties of zirconia slurry and its sintered billet

分别选取三乙醇胺、三油酸甘油酯、玉米油和鱼油作为分散剂,根据不同配方制备氧化锆浆料并分别测试其沉降高度;通过SEM扫描电镜观察分析分散剂种类对氧化锆浆料沉积物微观形貌的影响;优选出最佳分散剂后,再制作烧结坯片并测试其弯曲强度和烧结收缩率,研究最优分散剂的质量对烧结坯片力学性能的影响。结果表明:以鱼油为分散剂时,氧化锆浆料最为稳定均匀,沉降高度达到最低3.9 cm,在4种分散剂中效果最佳;以鱼油为分散剂时,浆料沉积物颗粒大小均匀,形状规则整齐,颗粒间隙很小,几乎没有气孔,而且随着鱼油质量的增大,烧结坯片的弯曲强度先增加后减小,收缩率先减小后增加;当鱼油质量为1.5 g、氧化锆质量为105 g时,烧结坯片的弯曲强度最大为33 MPa、烧结收缩率最小为4.2%。

Triethanolamine,trioleate,corn oil and fish oil were selected as four kinds of dispersants. Zirconia slurry were prepared according to different formulations and their sedimentation heights were tested respectively. The influence of dispersant types on the microstructure of slurry sediments was observed and analyzed by SEM. After the optimal dispersant is selected,the sintered billets were made and their bending strength and sintering shrinkage were tested and the influence of mass of the optimal dispersant on the mechanical properties of the sintered billet was studied. The results show that when fish oil is used as dispersant,the zirconiaslurry is the most stable and uniformand the sedimentation height reaches the minimum of 3. 9 cm and the effect is the best among the four dispersants. When fish oil is used as the dispersant,the size of slurry sediment particles is uniform,the shape is regular,the particle gap is small and there is almost no pores. With the increasing of fish oil mass,the bending strength of sintered billet firstly increases and then decreases,and the sintering shrinkage firstly decreases and then increases. When the mass of fish oil is 1. 5 g and the mass of 5 YSZ is 105 g,the maximum bending strength of the sintered billet is 33 MPa and the minimum sintering shrinkage is 4. 2%.