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Effect of additives on thermal shock resistance of corundum-mullite load bearing board
Author(s): 
Pages: 386-388,392
Year: Issue:  6
Journal: REFRACTORIES

Keyword:  刚玉莫来石承烧板窑具抗热震性添加剂;
Abstract: 以电熔莫来石为粗颗粒,α-Al2O3粉、硅线石粉和少量结合粘土等为基质,羧甲基纤维素为结合剂,分别添加钛白粉、锆英石粉及同时添加这两种粉体,经混合,液压成型,在1530℃保温2 h烧成制备了承烧板试样;研究了电熔白刚玉或莫来石中颗粒、钛白粉添加量(4%、6%、8%)、锆英石粉添加量(4%、6%、8%)及同时添加两种粉体(锆英石粉均为6%,钛白粉添加量分别为4%、6%、8%)对承烧板抗热震性能的影响.试验结果表明:以刚玉为中颗粒的试样的抗热震性能优于以莫来石为中颗粒的试样;在此基础上加入锆英石粉或钛白粉制成的试样的抗热震性会明显改善;当两者同时加入时,试样的抗热震性能改善更为显著.SEM分析显示:加入锆英石粉的试样析出锆石相,加入钛白粉的试样有钛酸铝生成,锆英石粉和钛白粉都添加的试样既存在锆石相,又生成钛酸铝晶体,这些相的存在使材料引入微裂纹和沿晶裂纹,有助于抗热震性能的提高.
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