聚碳硅烷对低碳铝碳材料结构与性能的影响  

Effect of polycarbosilane on structure and properties of low-carbon Al_2O_3-C refractories

作　　者：尚心莲 田响宇 刘国齐[1] 李红霞[1] 杨文刚[1] 于建宾[1] Shang Xinlian;Tian Xiangyu;Liu Guoqi;Li Hongxia;Yang Wengang;Yu Jianbin(State Key Laboratory of Advanced Refractories,Sinosteel Luoyang Institute of Refractories Research Co.,Ltd.,Luoyang 471039,Henan,China)

机构地区：[1]中钢集团洛阳耐火材料研究院有限公司先进耐火材料国家重点实验室,河南洛阳471039

出　　处：《耐火材料》2019年第1期16-20,共5页Refractories

基　　金：国家自然科学基金项目(51372231;51772277);河南省科技创新人才计划项目(164100510023);河南省基础与前沿研究项目(162300410057)

摘　　要：为了提高低碳铝碳耐火材料的高温性能,以板状刚玉、电熔白刚玉、α-Al_2O_3微粉、鳞片石墨为主要原料,环保沥青、液态热塑性酚醛树脂、固态树脂粉、固态聚碳硅烷和正己烷为外加剂,研究了聚碳硅烷外加量(加入质量分数分别为0、0. 3%和0. 6%)和热处理温度(950、1 100、1 250、1 400和1 550℃)对低碳铝碳材料显微结构、强度及抗热震性的影响。结果表明:经950℃热处理后,聚碳硅烷热解破坏酚醛树脂热解碳结构; 1 100～1 250℃时,聚碳硅烷生成网状结构,弥补材料强度;当聚碳硅烷外加量为0. 6%(w),于1 550℃热处理后,聚碳硅烷高温裂解生成含Si纤维,材料强度提高。但含Si纤维的生成,会引起材料热膨胀失配,从而导致试样热震后的强度保持率下降。In order to improve the high temperature properties of low-carbon Al2O3-refractories,tabular corundum,white fused corundum,α-Al2O3 micropowder,and flake graphite were used as raw materials,and environment-friendly pitch,thermal plastic phenolic resin liquid,solid resin powder,solid polycarbosilane (PCS) and n-hexane as additives.Effects of PCS extra-additions (0,0.3% and 0.6%,by mass) and heat-treatment temperatures (950,1100,1250,1400 and 1550 ℃) on microstructure,strength and thermal shock resistance of low-carbon Al2O3-C refractories were studied.The results show that:PCS pyrolyzes and destroys the pyrolytic carbon structure of phenolic resin at 950 ℃.The reticulate structure forms by PCS pyrolysis from 1100 ℃ to 1250 ℃,thus the material strength increases.When the extra-addition of PCS is 0.6% and the heat-treatment temperature is 1550 ℃,Si-containing whiskers form,which enhance the strength greatly.But the formed Si-containing whiskers will result in the mismatch of thermal expansion of the material,thus the retention ratio of the strength after thermal shock declines.

关 键 词：聚碳硅烷 高温热解 低碳铝碳材料 抗热震性 强度 

分 类 号：TQ175[化学工程—硅酸盐工业]