注浆成型-常温常压干燥制备隔热块体材料  

Preparation of Thermal Insulation Block by Slip Casting and Drying at Ambient Pressure and Room Temperature

作　　者：张明灿[1] 曾人杰[1] 

机构地区：[1]厦门大学材料学院材料科学与工程系,福建厦门361005

出　　处：《材料工程》2011年第9期33-38,共6页Journal of Materials Engineering

摘　　要：以二氧化硅气凝胶为基体,二氧化钛为红外遮光剂,E玻纤为骨架制备出有一定压缩强度的隔热块体材料;分别测样品的压缩强度R、热导率λ和常温（25℃）体积电阻率ρ。结果表明：pH=8~9时,含水料浆的分散情况较好;经过730℃处理0.5h的样品,与美国材料与试验协会的标准ASTM C533—85比较,R值0.41MPa符合,密度D=151kg.m-3较低;样品在常温和480℃时,常压下的热导率λn分别为0.036W.m-1.K-1和0.061W.m-1.K-1,低于或远低于一般隔热材料。同时系统研究了以水泥熟料为黏结剂、采用注浆成型-常温常压干燥制备隔热块体材料,原料和样品都无毒,制备工艺简单,成本低,容易实现产业化。A thermal insulation block with suitable compressive strength was prepared.Silica aerogel was used as a matrix,E-glass fiber as a framework,titanium dioxide as an opacifier.Compressive strength（R）,thermal conductivity（λ） and volume resistivity（ρ） at room temperature（25℃） were measured,respectively.Results show that the aqueous slurry is well dispersed when pH=8-9;the sample heated at 730℃ for 0.5h has a lower density（D） of 151kg·m-3 compared with The Standard of American Society for Testing of Materials（ASTM C533—85）,and the same R value 0.41MPa as the standard.At ambient pressure,the sample has thermal conductivity（λn） of 0.036W·m-1·K-1 at room temperature and 0.061W·m-1·K-1 at 480℃,respectively.The values are lower or much lower than those of traditional thermal insulation blocks,respectively.The preparation processing of thermal insulation block was investigated systematically.The white Portland cement clinker was creactively used as a binder,and the block was made by slip casting and then being dried at ambient pressure and room temperature.Both the raw materials and the sample are non-toxic.This project has good industrialization prospects owing to its processing simple and low cost.

关 键 词：二氧化硅气凝胶 E玻纤 二氧化钛 白色硅酸盐水泥熟料 

分 类 号：TB321[一般工业技术—材料科学与工程]