SiO2含量对YSZ陶瓷在高温时效中烧结性的影响

Effect of SiO2 Content on Sintering Characteristics of YSZ in High Temperature Ageing

摘要:

本文研究了SiO2含量对YSZ陶瓷在不同温度下时效后的烧结速率影响，同时研究了其对YSZ烧结过程中的结构形貌和性能变化的影响。实验中以正硅酸乙酯（TEOS）为硅源，制备了SiO2含量不同且有约10%气孔的YSZ陶瓷块体，并在不同温度下热处理180 h。通过扫描电镜（SEM）表征了样品的微观形貌，并使用阿基米德法测试得到样品气孔率，同时表征了样品高温时效后的相组成、力学及热学性能的变化。通过交流阻抗谱法初步判断了SiO2在YSZ陶瓷晶界上的分布。研究发现，0.3 wt%SiO2的引入将会使YSZ晶粒尺寸变大且气孔率显著降低，同时其硬度、杨氏模量及热导率的变化率明显较未添加SiO2的要快。

关键词:SiO2;YSZ;烧结;力学性能

Abstract:

The effect of SiO2 on the sintering rate of YSZ ceramics as well as on the morphology and properties of YSZ during sintering are studied. In this work, YSZ samples of 10% pores with different SiO2 content were prepared. The sample microstructures are characterized by scanning electron microscopy (SEM). The sample porosity was obtained by the Archimedes method. The phase composition, mechanical and thermal properties of samples after sintering were measured. It is found that the introduction of 0.3wt% SiO2 will make the YSZ grain size larger and the porosity decrease significantly. The hardness, Young's modulus and thermal conductivity of samples change faster due to the introduction of SiO2.

Key words:SiO2; YSZ; sintering; mechanical property