多孔颗粒状HAPw/n-ZnO复合材料的制备工艺研究

Preparation of Porous Granular HAPw/n-ZnO Composite Materials

目的：将粉末状羟基磷灰石晶须纳米氧化锌（HAPw/n-ZnO）复合材料制备成多孔颗粒状。方法：以HAPw/n-ZnO复合材料为原料,加入硅溶胶在不同温度下煅烧并借X射线衍射（XRD）分析确定硅溶胶与HAPw/n-ZnO发生化学反应的温度。再加入控制粒径100~250μm的造孔剂聚甲基丙烯酸甲酯（PMMA）及30wt%的硅溶胶为粘接剂,以魔芋萄甘聚糖（KGM）凝胶冷压过模成型烧结后粉碎过筛,应用X射线衍射、扫描电镜、万能试验机、阿基米德排水法测试分析。结果：硅溶胶与HAPw/n-ZnO在高于600℃时会发生反应;烧结600℃保温2h孔隙率最为理想;造孔剂含量为40VOL%时孔隙率为64.2%,抗压缩强度为0.9MPa。结论：造孔剂法可制备多孔HAPw/n-ZnO复合材料。

Objective.. To prepare porous HAPw/n- ZnO granules fromHAPw/n- ZnO powder. Method： HAPw/n--ZnO powder was mixed with silicon sol and calcined at different temperatures. X- ray diffraction （XRD） analysis was used to determine the optimal reaction temperature for the mixture. To obtain granules with pore diameter at about 100-250urn, polymethyl methacrylate （PMMA） and 30wt% of silica sol were respectively employed as pore-forming agent and binder. XRD, scanning electron microscope （SEM）, universal testing machine, and Archimedes principle were employed to analyze the new material. Results： The mixture of silicon sol and HAPw/n-ZnO could react at the temperature higher than 600℃. Heat preservation at 600℃ for 2 hours led to the optimal porosity. 64.2% porosity could be obtained when pore--forming agent content was 40% （v：v）, and the compression strength was 0. 9MPa. Conclusion.. Porous granular HAPw/n-ZnO composite material can be efficiently prepared by pore-forming agent method.