In this study, α-Al₂O₃@amorphous alumina nanocomposite core-shell structure was synthesized from AlCl₃ and the commercial α-Al₂O₃ nanoparticles as the starting materials via a wet chemical route. The results indicated that the shell material mainly comprised of ammonium chloride and boehmite phases. Boehmite was transformed to the amorphous and γ-Al₂O₃ phases after the calcination process and the shell material was completely converted to γ-Al₂O₃ at 1000 °C. However, for the α-Al₂O₃@amorphous alumina core-shell nanoparticles were completely converted to α-Al₂O₃ at 1000 °C. It can be concluded that α-Al₂O₃ core particles, as the seed crystalline, help to transforming of γ-Al₂O₃ phase as the shell material directly without forming transitional phases to α-Al₂O₃. The optical polycrystalline alumina was fabricated using spark plasma sintering of α-Al₂O₃@amorphous alumina core-shell nanocomposite. The body sintered has a final density of ∼99.8% and the in-line transmittance value is ∼80% within the IR range.

在这项研究中，α-Al系₂ ö ₃ @amorphous氧化铝纳米复合材料的核-壳结构由合成的AlCl ₃和市售的α-Al _2级ö ₃通过湿化学路线的纳米粒子作为起始原料。结果表明，壳材料主要由氯化铵和勃姆石相组成。勃姆石转化为非晶态和在γ-Al ₂ ö _3个阶段之后的煅烧过程和壳材料完全转化为γ-Al系₂ ö ₃在1000℃。然而，对于所述α-Al ₂ ö ₃@amorphous氧化铝核-壳纳米颗粒完全转化为α-Al系₂ ö ₃在1000℃。由此可以得出结论，α-Al系₂ ö ₃核粒子，作为种子晶体，有助于γ-Al系的转化₂ ö ₃直接而不形成过渡相到α-Al相作为壳材料₂ ö ₃。光学多晶氧化铝，使用放电等离子体的α-Al的烧结制造₂ ö ₃ @amorphous氧化铝核-壳纳米复合材料。烧结后的物体的最终密度约为99.8％，在线透射率在IR范围内约为80％。