8YSZ陶瓷成型与烧结工艺的优化

Molding and Sintering Processing Optimization of 8YSZ Ceramic

为了改善8YSZ陶瓷的力学性能,以8YSZ双粒度粉体为研究对象,对其进行干压成型、无压烧结实验。对成型压力、保压时间及黏结剂用量等成型工艺参数进行了优化;利用正交实验对烧结方案进行了设计,讨论了烧结温度、升温速率、保温时间、烧结方式等烧结工艺参数对8YSZ陶瓷烧结性能和力学性能的影响,并优化出其烧结工艺参数。结果表明:选取PVA加入量10%(质量分数)、成型压力10MPa、保压时间30s的成型工艺参数,可压制出相对密度为54.9%的陶瓷坯体;选取烧结温度1500℃,保温时间4h,升温速率5℃/min,烧结方式裸烧的烧结工艺参数,可制备出相对密度为98.3%,抗弯强度为100.3MPa的8YSZ陶瓷。

In order to improve the mechanical properties of 8YSZ ceramic,the 8YSZ bimodal particle sizes powders were dry pressed and pressureless sintered.The molding process parameters including the molding pressure,pressure holding time and dosage of binder were optimized.The sintering scheme based on orthogonal test was designed.The influence of the sintering process parameters including sintering temperature,heating rate,holding time,sintering method on the sintering properties and mechanical properties of 8YSZ was discussed and their optimization value were obtained.The results show that the green ceramic with the relative density of 54.9%can be obtained by adopting the optimized molding process parameters with the dosage of PVA of 10%（mass fraction）,the forming pressure of 10 MPa,the pressure holding time of 30 s.The 8YSZ ceramic with the relative density of98.3% and the bending strength of 100.3MPa can be prepared by adopting the optimized sintering process parameters with the sintering temperature of 1500℃,holding time of 4h,heating rate of 5℃/min,sintering methods of naked burning.