遷移金属酸化物を添加した遮光性窒化アルミニウムの合成と特性
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概要
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Aluminum nitride(AlN)powders were synthesized with 0.16-0.54 mol% of transition metal oxides, such as TiO_2, ZrO_2, Nb_2O_5, MoO_3, WO_3, and Fe _2O_3, and characterized in terms of their powder's properties. The synthesized AlN powders were then sintered under N_2 at 1850℃ for 3h with 5 mass% Y_2O_3 as a sintering aid. After which, the properties, such as density, thermal conductivity and optical transmittance, of the sintered ceramics were investigated. The chemical states in which the additives exist in both of the powders and the sintered ceramics were also investigated. Little change was observed in properties of the AlN powders when synthesized with the various additives, except for a small increase in oxypen content. The additives seem to change from being oxides to being nitrides during the synthesis process. A slight reduction in the thermal conductivity of the sintered AlN ceramics was noted with the addition of 0.16 mol% of the additives, but this became large as the amount was increased to 0.54 mol%. The additives in the sintered AlN ceramics existed as fine particles of either one of two kinds of chemical states ; the elements of group IV a existed as nitrides while the others existed as metals. The sintered AlN ceramics with transition metal additives indicated low optical transmittance, particularly for those with MoO_3 and Nb_2O_5. Consequently, shaded AlN ceramics with high thermal conductivity and virtually no optical transmittance in visible-light region were attainable.
- 社団法人日本セラミックス協会の論文
- 1998-01-01
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関連論文
- 1B10 AlN 粉体の構造と化学的安定性 (2)
- 1B09 AlN 粉体の構造と化学的安定性 (1)
- 窒化アルミニウム添加エポキシ樹脂の熱伝導率
- Y_2O_3助剤での窒化アルミニウムの焼結に及ぼす酸素量の影響
- ゾル-ゲル法によるアルミニウム箔上へのNb_2O_5薄膜の作製と容量特性
- 遷移金属酸化物を添加した遮光性窒化アルミニウムの合成と特性
- 湿式粉砕によるAlN微粉末の作製と特性評価
- AlNの焼結挙動に及ぼす粉体特性の影響 (特集 材料の高純化のための微量元素の分析と解析)
- 球状窒化アルミニウムフィラーの開発
- シリコンオキサイドで被覆された研磨窒化アルミニウム基板
- シリコンオキサイド薄膜による窒化アルミニウム基板表面の平坦化