MnO_2对8YSZ低温活化烧结及其性能的影响

Effect of MnO_2 on sintering ability and properties of 8YSZ

以MnO2为8YSZ的烧结助剂,研究MnO2含量和烧结工艺参数对8YSZ活化烧结及其性能的影响。采用阿基米德排水法、维氏显微硬度仪、电子万能试验机对烧结块体的致密度、硬度和抗弯强度进行分析,并使用扫描电子显微镜(SEM)、X线衍射分析(XRD)对其微观形貌和相组成进行表征。实验结果表明:块体的致密度随着MnO2含量的增加而逐渐增加,当MnO2添加量为3%时获得了最好的烧结效果;随着温度的升高,块体致密度也逐渐增加,在1 300℃烧结4 h时,致密度达到了98.59%;在此条件下,样品的硬度与抗弯强度均为最佳,分别为1 830.21(HV)与235.46 MPa。

Using MnO2 as sintering aids,the influence of MnO2 content and sintering process on sintering ability and properties of 8YSZ were investigated.Archimedes principle,hardness-testing devices and universal-testing machine was employed to measure the relative density,hardness and bending strength of the sintered bulk.XRD and SEM were also used to analyze the crystallographic phase,microstructure of the sintered bulk.The results show that the relative density of the sintered bulk increases with the increase of the proportion of MnO2.The best sintering ability is obtained when 3%MnO2 is doped.The relative density of the sintered bulk also increases as the temperature rises.The relative density reaches 98.59%,and the hardness and flexural strength reach 1830.21（HV） and 235.46 MPa respectively,when the sintering temperature is 1 300 ℃ and soaking time is 4 h.