添加玻璃之氮化鋁的熱電性質

Abstract

以氧化物玻璃來當作促進氮化鋁陶瓷液相燒結的助燒結劑,研究氧化物和 氧化物玻璃對氮化鋁粉末氧化的效應.研究發現釔系玻璃( 氧化釔-氧化 鋁-氧化矽)優於氧化釔和鉛系玻璃( 氧化鉛-氧化硼-氧化矽 ),氧化鉛和 氧化硼會促進氮化鋁氧化而氧化矽,氧化鋁和氧化釔不會有氧化的情形,研 究了燒結體的介電常數,損失因子,熱膨脹係數和熱傳導率,討論玻璃相和 添加物影響電和熱性質的情形,根據這些研究提出改進燒結行為和電熱性 質的建議. Oxide glasses have been used as liquid phase sintering aids for AlN ceramics. The effect of oxide and oxide glasses on the oxidation of AlN powder is investigated. Yttria-alumina- silicate glass (Y2O3-Al2O3-SiO2 glass) is more suitable than yttria (Y2O3) and lead-boro-silicate glass ( PbO-B2O3-SiO2 glass ) for use as sintering aid. PbO and B2O3 promote the oxidation, while SiO2, Al2O3, and Y2O3 have no influence on the oxidation. The dielec- tric constant, dissipation factor, complex impedance, thermal expansion coefficient, and thermal conductivity of the samples are studied. The influence of various glassy phases and dopants on electrical and thermal properties are discussed in detail. Base on these studies approaches to improve sintering behavior, electrical and thermal properties are proposed.