硼酸铝-六钛酸钾晶须复合隔热材料制备与性能  

Preparation and Properties of Aluminum Borate-Potassium Hexatitanate Whisker Composite Thermal Insulation Materials

作　　者：尚佳琪 刘浩[1] 王周福[1] 杨智谦 陈森娜 马妍[1] 王玺堂[1] SHANG Jiaqi;LIU Hao;WANG Zhoufu;YANG Zhiqian;CHEN Senna;MA Yan;WANG Xitang(The State Key Laboratory of Refractories and Metallurgy,Wuhan University of Science and Technology,Wuhan 430081,China)

机构地区：[1]武汉科技大学,省部共建耐火材料与冶金国家重点实验室,武汉430081

出　　处：《硅酸盐通报》2021年第10期3273-3278,共6页Bulletin of the Chinese Ceramic Society

基　　金：国家自然科学基金(U20A20239,51672195);国家级大学生创新创业训练计划(202110488002);武汉科技大学国防预研基金(GF201909)。

摘　　要：以硼酸、氢氧化铝、六钛酸钾晶须(PTW)等为主要原料,采用固相烧结法制备了硼酸铝-六钛酸钾晶须复合隔热材料,研究了预合成硼酸铝晶须(ABW)对材料显微结构、力学性能及隔热性能等方面的影响。结果表明:随着制备温度的提高,ABW与PTW由点接触转变为晶须间通过K1.5(Al1.5Ti6.5)O16相结合,提高了复合隔热材料的致密度和耐压强度;细小的ABW在PTW之间形成了尺寸更小的孔隙,通过减少对流和辐射传热,显著提高了晶须复合隔热材料的隔热性能。控制PTW、预合成ABW、炭黑质量比为9∶1∶3,在1 100℃可制得体积密度为1.11 g/cm^(3)、耐压强度为3.5 MPa、导热系数为0.11~0.16 W/(m·K)(200~800℃)的硼酸铝-六钛酸钾晶须复合隔热材料。Aluminum borate-potassium hexatitanate whisker composite thermal insulation materials were prepared by solid-state sintering with boric acid, aluminum hydroxide and potassium hexatitanate whiskers(PTW) as main raw materials. The effects of pre-synthesized aluminum borate whisker(ABW) on microstructure, mechanical and thermal insulation properties of the materials were studied. The results show that, with the increase of preparation temperature, ABW and PTW change from point contact to whisker through K1.5(Al1.5Ti6.5)O16 bonding phase, resulting in the increase of density and compressive strength of the composite thermal insulation materials. Fine ABW forms smaller pores between PTW, which significantly improves the thermal insulation property of the composite thermal insulation materials by reducing convection and radiation heat transfer. As for the composite insulation materials prepared at 1 100 ℃ by controlling PTW, pre-synthesized ABW and carbon black mass ratio of 9 ∶1 ∶3, the bulk density, compressive strength and thermal conductivity are 1.11 g/cm^(3), 3.5 MPa and 0.11 W/(m·K) to 0.16 W/(m·K)(from 200 ℃ to 800 ℃), respectively.

关 键 词：隔热材料 六钛酸钾 硼酸铝 晶须 力学性能 隔热性能 

分 类 号：TQ175[化学工程—硅酸盐工业]