以无水氯化铝和异丙醚为原料,采用非水解溶胶-凝胶法制备出氧化铝凝胶。其经800℃煅烧才析出少量γ-Al2 O3晶体,γ-Al2 O3向α-Al2 O3晶型转变在1200℃附近,经900℃煅烧后比表面积仍高达145m2/g,具有介孔结构。以该高活性氧化铝凝胶作为铝源,采用碳热还原氮化工艺合成氮化铝粉体。结果表明,氧化铝凝胶经300℃预煅烧,按n(C)/n(Al)=7.8与碳黑混合,在流量80mL/min 高纯 N2中,于1450℃还原氮化2h便可合成出平均粒径在400nm 的高纯六方相AlN粉体。
The alumina xerogel was prepared by non-hydrolytic sol-gel method using anhydrous aluminium tri-chloride with isopropyl ether as raw materials.After the xerogel was calcined at 800℃,the phase ofγ-Al2 O3 began to crystallize from the amorphous phase,and then converted toα-Al2 O3 near 1200℃.The smaple kept a high specific surface area of 145m2/g to about 900℃,and possessed the mesoporous structure.Using the alu-mina xerogel as the aluminum source,aluminum nitride ultrafine powder was synthesized by the carbon thermal reduction nitridation process.The resluts showed that when the alumina xerogel was pre-calcinated at 300℃, the C/Al molar ratio amount of the carbon was 7.8,the flow rate of nitrogen was 80mL/min,the synthesis temperture was 1450℃ and the soaking time was 2h,the high purity hexagonal phase aluminum nitride powder with the average size of about 400nm could be obtained.
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