原位合成磷酸铝助烧剂制备轻质氧化铝空心球陶瓷  

Preparation of lightweight bubble alumina ceremic by in-situ synthesizing sintering agent aluminum phosphate

作　　者：王家邦[1] 杨辉[1] 傅晓云[2] 孔德玉[1] 程本军[1] 

机构地区：[1]浙江大学材料与科学工程学系,杭州310027 [2]浙江工业大学

出　　处：《耐火材料》2004年第2期103-106,共4页Refractories

基　　金：浙江省科技计划资助项目 (0 1110 10 77)

摘　　要：采用氧化铝空心球和α Al2 O3微粉为原料 ,以磷酸溶液为结合剂制备了轻质氧化铝空心球陶瓷。研究结果表明 ,磷酸与α Al2 O3微粉原位反应生成的磷酸铝能促进轻质氧化铝空心球陶瓷的烧结 :以浓度 2 5wt%的磷酸为结合剂并经 90 0℃保温 4h烧结后的轻质氧化铝空心球陶瓷 (密度为 1.4g·cm- 3) ,耐压强度达 11.8MPa ,可直接用于窑炉砌筑 ,并可在使用过程中通过二次烧结进一步提高其强度 ;以浓度为 5 0wt%的磷酸结合并经 170 0℃保温4h烧结后的轻质氧化铝空心球陶瓷 (密度为 1.4g·cm- 3) ,耐压强度达到 2 2 .8MPa ,荷重软化温度超过170 0℃ (0 .1MPa)。The lightweight bubble alumina ceramic was prepared with bubble alumina and α-Al 2O 3 powder,together with orthophosphoric acid solution as the binder.The results showed that orthophosphoric acid and α-Al 2O 3 in-situ reacted and formed aluminium phosphate that can promote the sintering of bubble alumina ceramic.Using 25 wt% orthophosphoric acid solution as the binder,after heat-treatment at 900 ℃ for 4 h,compressive strength (RT) of the lightweight alumina ceramic with relative density of 1.40 g·cm -3 reached 11.8 MPa.Therefore it can be used as thermal insulation materials to build the high temperature kiln directly after heat-treatment at low temperature,and the strength of the ceramic can be enhanced through the secondary sintering while used in the kiln.Using 50 wt% of orthophosphoric acid solution as the binder and sintered at 1700 ℃ for 4 h,compressive strength (RT) of the lightweight alumina ceramic with relative density of 1.40 g·cm -3 reached 22.8 MPa,and refractoriness under load (0.1 MPa) was higher than 1700 ℃.

关 键 词：轻质耐火材料 氧化铝陶瓷 氧化铝空心球 Α-AL2O3微粉 原位合成工艺 磷酸铝 

分 类 号：TQ175.712[化学工程—硅酸盐工业] TQ174.758