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

Abstract

Abstract: 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 K_1.5(Al_1.5Ti_6.5)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 insulationproperty 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/cm³, 3.5 MPa and 0.11 W/(m·K) to0.16 W/(m·K) (from 200 ℃ to 800 ℃), respectively.

Key words: thermal insulation material, potassium hexatitanate, aluminum borate, whisker, mechanical property, thermal insulation property

CLC Number:

TQ175

SHANG Jiaqi, LIU Hao, WANG Zhoufu, YANG Zhiqian, CHEN Senna, MA Yan, WANG Xitang. Preparation and Properties of Aluminum Borate-Potassium Hexatitanate Whisker Composite Thermal Insulation Materials[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(10): 3273-3278.

References

[1] SUDHEER M, SUBBAYA K M, JAWALI D, et al. Mechanical properties of potassium titanate whisker reinforced epoxy resin composites[J]. Journal of Minerals and Materials Characterization and Engineering, 2012, 11(2): 193-211.
[2] 王卫,费阳,汪涛.红外遮光剂对硅酸盐隔热保温涂料性能的影响[J].硅酸盐通报,2017,36(6):2079-2082+2105.
WANG W, FEI Y, WANG T. Effects of infrared opacifiers on properties of silicate thermal insulating coatings[J]. Bulletin of the Chinese Ceramic Society, 2017, 36(6): 2079-2082+2105 (in Chinese).
[3] LI M H, LIU H, WANG Z F, et al. Facile synthesis of potassium hexatitanate whiskers by calcination at low temperature[J]. Journal of the Australian Ceramic Society, 2020, 56(3): 859-865.
[4] 林本兰,崔升,沈晓冬,等.六钛酸钾晶须掺杂改性气凝胶的结构和性能[J].南京工业大学学报(自然科学版),2012,34(1):20-23.
LIN B L, CUI S, SHEN X D, et al. Microstructure and properties of PTW-doped SiO₂ aerogels[J]. Journal of Nanjing University of Technology (Natural Science Edition), 2012, 34(1): 20-23 (in Chinese).
[5] LIU H, WEI N, WANG Z F, et al. Fabrication and properties of aluminum silicate fibrous materials with in situ synthesized K₂Ti₆O₁₃ whiskers[J]. International Journal of Minerals, Metallurgy, and Materials, 2017, 24(11): 1335-1340.
[6] 张娜,张玉军.掺杂六钛酸钾晶须硅酸铝纤维复合隔热材料的研制[J].中国陶瓷,2009,45(5):44-47.
ZHANG N, ZHANG Y J. A study on alumina-silica fiberboards doped with K₂Ti₆O₁₃ whiskers[J]. China Ceramics, 2009, 45(5): 44-47 (in Chinese).
[7] GULLEDGE H. Fibrous potassium titanate: a new high temperature insulating material[J]. Industrial & Engineering Chemistry, 1960, 52(2): 117-118.
[8] 吉晓莉,谢力,刘斌智,等.正交法优选六钛酸钾浆料体系制备多孔陶瓷[J].武汉理工大学学报,2015,37(10):17-21.
JI X L, XIE L, LIU B Z, et al. Preparation of porous ceramics with optimized potassium hexatitanate slurry system by orthogonal test[J]. Journal of Wuhan University of Technology, 2015, 37(10): 17-21 (in Chinese).
[9] 杨祝红,陆闪山,陆小华,等.钛酸盐多孔隔热材料的制备方法:CN200910234670.9[P].2010-06-09.
YANG Z H, LU S S, LU X H, et al. Preparation method of titanate porous thermal insulation material: CN200910234670.9[P]. 2010-06-09 (in Chinese).
[10] ZHOU Y X, LIU C, HE M, et al. Preparation and characterization of alkaline resistant porous ceramics from potassium titanate whiskers[J]. Chinese Journal of Chemical Engineering, 2007, 15(5): 742-747.
[11] KIM S W, LEE S G, KIM J K, et al. Synthesis of aluminum borate whiskers via flux method with and without microwaves[J]. Journal of Materials Science, 2004, 39(4): 1445-1447.
[12] CAO J, YANG B, LI C, et al. Surface synthesis of aluminum borate whiskers on the ZTA ceramics and its application to joining[J]. Ceramics International, 2021, 47(8): 11269-11275.
[13] WANG Y F, FENG J C, WANG Z J, et al. Joining of Al₂O₃ by epitaxial growth of aluminum borate whiskers for high-temperature applications[J]. Materials Letters, 2016, 163: 231-235.
[14] 秦朝举,张卫正,原彦鹏,等.硼酸铝晶须增强铝硅基复合材料活塞烧蚀研究[J].哈尔滨工程大学学报,2018,39(1):143-147+168.
QIN Z J, ZHANG W Z, YUAN Y P, et al. Analysis of ablation properties of piston of aluminum borate whisker reinforced Al-Si matrix composites[J]. Journal of Harbin Engineering University, 2018, 39(1): 143-147+168 (in Chinese).
[15] HERNÁNDEZ M F, SUÁREZ G, CIPOLLONE M, et al. Mechanical behavior and microstructure of porous needle: aluminum borate (Al₁₈B₄O₃₃) and Al₂O₃-Al₁₈B₄O₃₃ composites[J]. Ceramics International, 2017, 43(15): 11759-11765.
[16] 朱守丹,张永财.由氧化铝和硼酸制备的硼酸铝陶瓷的显微结构和性能[J].耐火与石灰,2018,43(6):55-60.
ZHU S D, ZHANG Y C. Formation, microstructure and properties of aluminum borate ceramics obtained from alumina and boric acid[J]. Refractories & Lime, 2018, 43(6): 55-60 (in Chinese).
[17] ZHANG H X, HE X D, HE F. Microstructure and physicochemical properties of ambient-dried SiO₂ aerogels with K₂Ti₆O₁₃ whisker additive[J]. Journal of Alloys and Compounds, 2009, 472(1/2): 194-197.
[18] 花开慧,陈颖敏,张泽钦,等.硼酸铝晶须的研究及应用进展[J].人工晶体学报,2020,49(5):940-945.
HUA K H, CHEN Y M, ZHANG Z Q, et al. Progress on research and application of aluminum borate whiskers[J]. Journal of Synthetic Crystals, 2020, 49(5): 940-945 (in Chinese).
[19] 冯新,吕家桢,陆小华,等.钛酸钾晶须在复合材料中的应用[J].复合材料学报,1999,16(4):1-7.
FENG X, LÜ J Z, LU X H, et al. Applications of potassium titanate whiskers in composite materials[J]. Acta Materiae Compositae Sinica, 1999, 16(4): 1-7 (in Chinese).
[20] 陈康康,王刚,王来稳.制备工艺对六钛酸钾晶须隔热材料性能的影响[J].耐火材料,2010,44(4):276-279.
CHEN K K, WANG G, WANG L W. Effects of preparing process on properties of potassium hexatitanate whiskers insulating materials[J]. Refractories, 2010, 44(4): 276-279 (in Chinese).