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室温固化磷酸二氢铝–硅溶胶复合高温黏结剂的制备及物理性能
作者:陈洋 丁军 邓承继 余超 祝洪喜 徐文渊 
单位: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 
关键词:室温固化 高温黏结剂 强度 物相 显微结构 
分类号:TQ175
出版年,卷(期):页码:2018,46(12):0-0
DOI:10.14062/j.issn.0454-5648.2018.12.16
摘要:

 以氧化铝和硅微粉为主要原料、磷酸二氢铝–硅溶胶为复合结合剂、氧化镁为固化剂,制备出一种新型无机高温黏结剂,研究配方组成、烧成温度对黏结剂显微结构和物理性能的影响。结果表明:无机高温黏结剂可常温固化;硅微粉的过量加入使得试样在高温烧成过程中产生大量液相,严重影响试样性能;当质量比Al2O3:SiO2=5:2、烧成温度在1 300~1 500 ℃时,材料显微结构较好;当试样烧成温度达到1 500 ℃时,试样中柱状莫来石粗化,且莫来石从液相中析出,其Young's模量、常温抗折强度和常温耐压强度分别为36.5 GPa、11.7 MPa和15.4 MPa。

 An inorganic high-temperature adhesive was prepared by using alumina and silica powder as main raw materials, aluminum dihydrogen phosphate–silica sol as a composite binder and magnesium oxide as acuring agent. The effects of formulation composition and sintering temperature on the microstructure and physical properties of the adhesive were investigated. The prepared inorganic high-temperature adhesive can be cured at room temperature. The excessive addition of silica powder can cause a large amount of liquid phase in the firing of the sample at a high temperature, which seriously affects the performance of the sample. The microstructure of the synthesized adhesive can be obtained at a mass ratio of Al2O3:SiO2 of 5:2 and the sintering temperature of 1 300–1 500 ℃. At 1 500 ℃, the columnar mullite is coarsened in the sample, and the mullite is precipitated from the liquid phase. The Young modulus, flexural strength and compressive strength of the sample are 36.5 GPa, 11.7 MPa and 15.4 MPa, respectively.

基金项目:
国家自然科学基金(51574187,51502215,51602232)和湖北 省自然科学基金创新群体项目(2018CFA022)联合资助。
作者简介:
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