(中南大學(xué) 材料科學(xué)與工程學(xué)院，長沙 410083)
摘 要: 采用高分子網(wǎng)絡(luò)法制備混合納米粉體，研究稀土氧化物Y2O3和Pr6O11加入量對Al2O3陶瓷相對密度和熱導(dǎo)率的影響。采用阿基米德方法測定樣品的體積密度，利用激光脈沖法測量試樣的熱擴(kuò)散率并計(jì)算得出熱導(dǎo)率。結(jié)果表明：兩種添加劑都可以降低Al2O3陶瓷的燒結(jié)溫度，提高Al2O3陶瓷的熱導(dǎo)率，其中Y2O3的促進(jìn)作用較強(qiáng)；當(dāng)保溫時(shí)間相同、燒結(jié)溫度為1 500~1 650 ℃時(shí)，Al2O3陶瓷的相對密度和熱導(dǎo)率都隨燒結(jié)溫度的升高而增大；當(dāng)燒結(jié)溫度相同、保溫時(shí)間為30~120 min時(shí)，Al2O3陶瓷的相對密度和熱導(dǎo)率也隨保溫時(shí)間的延長而增大。
關(guān)鍵字: Al2O3陶瓷；Y2O3；Pr6O11；燒結(jié)溫度；保溫時(shí)間；相對密度；熱導(dǎo)率
（School of Materials Science and Engineering, Central South University, Changsha 410083, China）
Abstract:The effects of the amounts of Y2O3 and Pr6O11 on the relative density and thermal conductivity of the Al2O3 ceramics were investigated by preparing mixed nanometer powders through polymer network method. The bulk density of the Al2O3 ceramics was measured by the Archimedes method. The thermal diffusivity was measured by the laser pulse method, and the thermal conductivity was calculated. The results show that both sintering aids in the alumina powders can decrease the sintering temperature and improve the thermal conductivity, and the role of Y2O3 is more effective. When the holding time is the same and the sintering temperature is 1 500−1 650 ℃, the relative density and the thermal conductivity of Al2O3 ceramics increase with the increase of the sintering temperature. When the sintering temperature is the same and the holding time is 30−120 min, the relative density and thermal conductivity of Al2O3 ceramics also increase with the increase of the holding time. The causes affecting the thermal conductivity of Al2O3 ceramics are explained according to the microstructure and the theory of heat transfer by phonon.
Key words: Al2O3 ceramics; Y2O3; Pr6O11; sintering temperature; holding time; relative density; thermal conductivity
