结晶氯化铝对沙漠绿化砖机械性能的影响研究  

STUDY ON THE INFLUENCE OF THE CRYSTAL ALUMINUM CHLORIDE ON THE MECHANICAL PROPERTIES OF THE GREEN CHEMICAL SAND-FIXING BRICK

作　　者：李婷[1] 邓湘云[1,2] 李建保[1,3] 

机构地区：[1]海南优势资源化工材料应用技术教育部重点实验室,硅锆钛资源综合开发与利用海南省重点实验室,海南大学材料与化工学院,海口570228 [2]天津师范大学物理与电子信息学院,天津300387 [3]新型陶瓷与精细工艺国家重点实验室,清华大学材料科学与工程系,北京100084

出　　处：《陶瓷学报》2009年第4期452-457,共6页Journal of Ceramics

基　　金：国家高技术研究发展计划(863计划)资助项目(编号:2007AA03Z524);国家自然科学基金资助项目(编号:50872093);中日合作项目"流动沙丘固定和用于绿化的新型化学材料的研究和青海湖周边示范区的施工方法"

摘　　要：利用结晶氯化铝与水玻璃反应生成的铝改性硅胶做粘结剂制备沙漠绿化砖。分别采用核磁共振仪、扫描电子显微镜和万能材料试验机测试分析了铝改性硅胶固沙块试样的结构、成分以及机械性能。结果表明:固沙砖材料抗压强度随铝盐固化剂浓度改变,在浓度为2mol/L时达最大7.121MPa;2mol/L氯化铝改性硅胶中形成的铝氧四配位体稳定性高于1mol/L氯化铝改性硅胶中形成的铝氧六配位体,并从晶体场中能量效应和铝氧键键长、键强两个方面予以证明,这是影响固沙块试样抗压强度改变的主要原因;此外,由扫描电镜能谱分析得试样中Si∶Al原子比约为5∶1,推测此改性硅胶中含有-Si-O-Al-O-(Si-O-)4基团。Al3＋ modified silica gel green chemical sand-fixing brick was prepared by aqueous solution of sodium silicate （Na2O· nSiO2） and aluminium chloride. 29Si and 27Al MAS NMR spectra, SEM and energy spectrum analysis （SEM-EDS） and hydraulic universal testing machine were used in combination with the experiment to study the structure and mechanical properties of Al3＋ modified silica gel sand-fixing materials. The results show that the compressive strength of the materials was affected by the concentration of the aluminium chloride and it reaches the maximum at the aluminium chloride concentration of 2mol/L; Al-O quadridentate is more stable than Al-O sexadentate, which was proved by crystal field energy effect, Al-O bond length and bond intension. This was the main reason for mechanical properties changing. In addition, it is supposed that aluminosilicate gel containing-Si-O-Al-O-（Si-O-）4 groups from the result of atomic ratio of Si/Al was 5：1.

关 键 词：铝改性硅胶 机械强度 核磁共振 能谱分析 

分 类 号：TQ177.4[化学工程—硅酸盐工业]