将不同粒径(＜15 μm、43～77 μm和＞100 μm)的粉煤灰微珠分别与一定比例的(低于理论用量20%、理论用量、高于理论用量10%)活性炭均匀混合后,置于氧化铝坩埚中,在高温氮化炉中分别于1 300 ℃、1 350 ℃、1 400 ℃、1 450 ℃和1 500 ℃保温6 h处理制备β-SiAlON空心球.借助XRD和SEM研究了温度、微珠粒径和活性炭用量对粉煤灰微珠氮化后相组成和形貌的影响.结果表明:粉煤灰微珠的氮化反应开始于1 300 ℃;过量的活性炭是形成β-SiAlON空心球的必要条件,粒径是微珠氮化后维持球形形貌的重要因素;1 500 ℃,在活性炭过量10%的条件下,利用粒径大于100 μm的粉煤灰微珠制备的β-SiAlON空心球,具有表面粗糙、空心度大和密度低等特点.
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