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- 2018
高温N2气氛下树脂结合刚玉材料中阿隆相的形成机制
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Abstract:
以酚醛树脂为结合剂，分别以100wt%烧结刚玉细粉、100wt%电熔刚玉细粉和50wt%烧结刚玉加50wt%电熔刚玉混合细粉为原料制备试样，试样在N2气氛下经1 500℃和1 600℃烧成，对烧后试样进行XRD、SEM和EDAS表征分析。结果表明：1 500℃烧后试样中生成了γ-AlON（Al5O6N）和12H多型体（Al6O3N4），1 600℃烧后试样中生成了γ-AlON（Al5O6N）、21R多型体（Al7O3N5）和16H多型体（Al8O3N6）。1 600℃烧成试样中生成的阿隆（AlON）含量较1 500℃烧成试样显著增多。在相同温度下，50wt%烧结刚玉加50wt%电熔刚玉混合细粉试样中生成的AlON含量最多，100wt%电熔刚玉细粉试样次之，100%烧结刚玉细粉试样中生成的AlON含量最少。分析了AlON的形成机制并建立了刚玉细粉与碳的反应模型。 Using phenolic resin as binding agent, samples with sintered alumina (100wt%), fused corundum (100wt%) and sintered alumina (50wt%) mixed with fused corundum (50wt%) were prepared, respectively, then the samples were sintered at 1 500℃ and 1 600℃ under flowing nitrogen, respectively. Sintered samples were characterized by XRD, SEM and EDAS. The results show that γ-AlON(Al5O6N) and 12H polytype(Al6O3N4) form in samples sintered at 1 500℃, while γ-AlON(Al5O6N), 21R polytype(Al7O3N5) and 16H polytype(Al8O3N6) form in samples sintered at 1 600℃. The content of AlON increases remarkably in samples sintered at 1 600℃ compared with samples sintered at 1 500℃. At the same sintering temperature, AlON contents in samples prepared with sintered alumina (50wt%) mixed with fused corundum (50wt%), fused corundum (100wt%) and sintered alumina (100wt%) decrease inturn. The formation mechanism of AlON was studied and the reaction model of alumina powder and carbonis was presented. 水泥回转窑炉用MgO-Al2O3-FeOx高效低成本制备关键技术研发（BE2016043）
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