(中南大学 材料科学与工程学院,长沙 410083)
摘 要: 采用干压成型和还原气氛烧结的方法制备BeO瓷片,采用正交实验方法分析多种烧结工艺参数和不同烧结助剂对BeO瓷片烧结后组织性能的影响。结合X射线衍射和SEM等方法讨论评价BeO陶瓷较好的制备工艺。结果表明:添加复合助剂Fe2O3和MgO的瓷片热导率最高,且在相同掺杂条件下,随烧结温度的提高和保温时间的增长,BeO陶瓷的热导率也随之提高。在选择的 4个影响因素中,烧结温度是增加BeO陶瓷相对密度及热导率的重要影响因素,在1 680 ℃保温90 min,添加复合助剂Fe2O3和MgO的瓷片室温热导率最高达 186.3 W/(m∙K)。
关键字: BeO陶瓷;烧结;正交实验;热导率
(School of Materials Science and Engineering, Central South University, Changsha 410083, China)
Abstract:The BeO ceramics were prepared by dry pressing moulding and sintering in H2 atmosphere. The influence of the different additives and sintering techniques on the microstructures and properties of BeO ceramics was studied by X-ray diffraction (XRD) and scanning electronic microscope (SEM). The influence factors were analyzed by orthogonal experiment. The results show that the thermal conductivity of the BeO ceramics with Fe2O3 and MgO is the highest in all studied ceramics. And the thermal conductivities in the ceramics increase with the increase of the sintering temperatures and time. The effects of sintering temperatures on the relative densities and the thermal conductivities are obvious. The highest thermal conductivity of BeO ceramics with Fe2O3 and MgO in room-temperature reaches 186.3 W/ (m∙K).
Key words: BeO ceramics; sintering; orthogonal experiment; thermal conductivities