Pr_6O_(11)和烧结工艺对BeO陶瓷相对密度和热导率的影响

Effects of Pr_6O_(11) and Sintering Process on Relative Density and Thermal Conductivity of BeO Ceramics

研究了不同烧结温度以及保温时间下氧化镨（Pr6O11）加入量对BeO陶瓷相对密度和热导率的影响。结果表明：添加2%和1%（质量分数）Pr6O11的BeO陶瓷分别具有最高的相对密度（92.43%）和最高的热导率（234.18 W/（m.K））;当保温时间相同且温度在（1 550~1 650℃）范围内时,BeO陶瓷相对密度随温度的升高而增大;当烧结温度相同时,BeO陶瓷的相对密度随保温时间的延长而增大,但增幅较小。采用阿基米德排水法测得BeO陶瓷的相对密度,并从显微组织和声子导热理论角度解释影响BeO陶瓷热导率的原因。

Effects of Pr6O11 content on relative density and thermal conductivity of BeO ceramics at different sintering temperature and holding time were investigated.The results showed that BeO ceramics added 2%（mass fraction） Pr6O11 had the highest relative density（92.43%）,and BeO Ceramics added 1% Pr6O11 had the hightest thermal conductivity（234.18 W/（m·K））.When the holding time was the same and the temperature was in the range of 1550～1650 ℃,the relative density of BeO ceramics increased with the increase of the sintering temperature.When the sintering temperature was the same,the relative density of BeO ceramics increased with the extension of the holding time,but the amplification was less.The relative density of BeO ceramics was measured by Archimedes method and the causes affecting the thermal conductivity of BeO ceramics were explained according to the microstructure and the theory of heat transferred by phonon.