溶胶—凝胶法制备莫来石晶须

用正硅酸乙酯，硝酸铝为原料，采用溶胶－凝胶工艺制备了Ａｌ２Ｏ３－ＳｉＯ２干凝胶，通过高温热处理制得了直径为０．５－２．５μｍ，长径比为５－４０的莫来石晶须。采用ＸＲＤ，ＳＥＭ，ＴＥＭ和ＳＡＤＰ等手段研究了莫来石晶须的晶相组成，形貌与生长方向，发现莫来石晶须是沿其ｃ轴方向生长的。     

溶胶－凝胶法制备莫来石晶须

用正硅酸乙酯、硝酸铝为原料，采用溶胶－凝胶工艺制备了Ａｌ＿２Ｏ＿３－ＳｉＯ＿２干凝胶，通过高温热处理制得了直径为０．５～２．５μｍ，长径比为５～４０的莫来石晶须。采用ＸＲＤ，ＳＥＭ，ＴＥＭ和ＳＡＤＰ等手段研究了莫来石晶须的晶相组成、形貌与生长方向，发现莫来石晶须是沿其ｃ轴方向生长的。用４ｍｏｌ／ＬＮＨ＿３·Ｈ＿２Ｏ催化的Ａｌ＿２Ｏ＿３－ＳｉＯ＿２溶胶的凝胶化时间越短，经高温热处理后莫来石晶须含量越高。     

Sol-Gel-SCFD法合成莫来石超细粉的结构性能表征

采用溶胶（Ｓｏｌ）－凝胶（Ｇｅｌ）－超临界流体干燥（ＳＣＦＤ）法合成了莫来石超细粉,并对其结构性能进行了现代测试分析表征,结果表明,ＣＯ２低温超临界流体干燥能有效地防止凝胶干燥过程中粒子间硬团聚现象的发生,该法制备的莫来石超细粉成分准确,平均粒径小于２００ｎｍ,比表面积大于３８ｍ＾２／ｇ,具有很高的烧结活性。     

溶胶－凝胶法制备SiO_2低反射涂层

溶胶－凝胶法制备ＳｉＯ＿２低反射涂层宋鹏，徐华强，陈奇，程继健（华东理工大学玻璃与陶瓷研究所上海２００２３７）ＬｏｗＲｅｆｌｅｃｔｌｖｅＳｉＯ＿２ＣｏｎｔｉｎｇｓＰｒｅｐａｒｅｄｂｙｔｈｅＳｏｌ－ＧｅｌＰｒｏｃｅｓｓ￥ＳｏｎｇＬｉ；ＸｕＨｕａｑｉａｎ...     

PZTS系凝胶玻璃及玻璃陶瓷的结构研究

采用溶胶凝胶工艺在低温下合成均匀透明的ＰＺＴＳ新型多组元凝胶玻璃，并在凝胶玻璃中成功地析出ＰｂＴｉＯ３，Ｐｂ（Ｚｒ，Ｔｉ）Ｏ３纳米微晶。利用ＩＲ谱分析了凝胶玻璃中Ｓｉ－Ｏ－Ｓｉ，Ｓｉ－Ｏ－Ｔｉ等化学键在成胶过程中的形成以及在热处理过程中的变化，根据Ｋｉｓｓｉｎｇｅｒ原理估算了ＰＴＳ凝胶玻璃的析晶活化能。借助ＸＲＤ较系统地研究了凝胶玻璃在高温下的结晶结构。探讨了在ＰＺＳ、ＰＺＴＳ体系中ＺｒＯ２和Ｓｉ     

溶胶—凝胶法合成了BaAl2Si2O8超细粉末的研究

以Ｂａ（ＯＨ）２．８Ｈ２Ｏ，Ａｌ（ＮＯ３）３．９Ｈ２Ｏ，ＴＥＯＳ为原料，采用溶胶－凝胶法制备ＢａＯ－Ａｌ２Ｏ３－ＳｉＯ２三元系粉末，研究了不同因素对生成稳定溶胶和胶化时间的影响，用ＴＧ－ＤＴＡ，ＸＲＤ研究了溶胶－凝胶的热处理过程，用ＴＥＭ观察了粉体的粒径。     

电熔锆莫来石研制

电熔锆莫来石研制施毓斐（上海日用玻璃制品公司耐火材料部２０００２０）ＡｎＩｎｖｅｓｔｉｇａｔｉｏｎｏｆＥｌｅｃｔｒｏ－ＭｅｌｔｅｄＺｉｒｃｏｎｉａＭｕｌｌｉｔｅ￥ＳｈｉＹｕｆｅｉ（ＳｈａｎｇｈａｉＤｏｍｅｓｔｉｃＧｌａｓｓｗａｒｅＣｏ．，Ｒｅｆｒａｃ...     

纳米RuO_2-SnO_2二元氧化物的制备

采用溶胶凝胶法,制备出了ＲｕＯ２－ＳｎＯ２二元氯化物纳米粉末,并用差热分析（ＤＴＡ）、Ｘ射线衍射（ＸＲＤ）、扫描电镜（ＳＥＭ）、电子探针Ｘ射线显微分析（ＥＰＡ）、透射电镜（ＴＥＭ）分析了其相组织和形态。     

含AgX的SiO2凝胶的变色机理

本研究用溶胶－凝胶法制备了含ＡｇＸ（Ｘ：Ｃｌ＾－、Ｂｒ＾－、Ｉ＾－）的变色凝胶及玻璃。利用Ｘ射线衍射，差热－失重分析，红外吸收光谱和紫外－可见光谱分析，对ＳｉＯ２凝胶的变色机理进行了研究。本研究为用溶胶－凝胶法制备光致变色玻璃提供了依据。     

温度对合成堇青石—莫来石复相材料的影响

本文用溶胶－凝胶法合成的二氧化硅、硝酸铝和硝酸镁合成堇青石－莫来石复相材料，研究了温度对合成复合的影响。     

莫来石纺丝溶胶的流变特性及可纺性研究

本文以氢氧化铝为铝源,以硅溶胶为硅源,采用溶胶-凝胶技术制备了莫来石纺丝溶胶,采用稳态及动态两种测试模式,研究了纺丝溶胶的粘度及流变性能,并采用干法纺丝制备连续莫来石凝胶纤维,评价了溶胶的可纺性。结果表明,温度对溶胶的非牛顿指数及结构粘度指数影响不大,这将有利于纺丝工艺的调节;高固含量有利于莫来石凝胶纤维的纺丝成纤,制备的凝胶纤维更细,纺丝稳定性更好。     

凝胶法片状莫来石粉的制备及应用

采用拟薄水铝石和非晶态超细SiO_2微粉为原料。以溶胶-凝胶工艺制取莫来石凝胶,通过干燥、煅烧研制得片状结晶莫来石粉。初步研究了凝胶法莫来石粉在钛酸铝陶瓷和烧结刚玉砖中的应用。实验结果表明:凝胶粉起到了促进烧结、降低烧成温度的作用,并使钛酸铝——莫来石复相陶瓷和刚玉砖的强度得到了显著提高。     

用凝胶法制备片状莫来石粉及其应用

用拟薄水铝石和非晶态ＳｉＯ_２微粉为原料，用溶胶－凝胶工艺制取了莫来石凝胶。通过干燥、煅烧，制得片状结晶莫来石粉．初步研究了凝胶法莫来石粉在钛酸铝陶瓷和烧结刚玉砖中的应用。实验结果表明，片状莫来石起了促进烧结、降低烧成温度的作用，并使钛酸铝－莫来石复相陶瓷和刚玉砖的强度得到显著提高．     

Comparative study of conventional and microwave sintered mullite fibres: structural study

Mullite fibres were synthesised from a mixture of aluminium, aluminium chloride and acidic silica solutions as monophasic salts using a sol–gel technique. The viscosity and rheological behaviour of the mullite precursor sol were examined. Mullite fibres were synthesised using both conventional and microwave sintering techniques. The samples were characterised by X-ray diffraction and scanning electron microscopy. Pure mullite fibres were synthesised by microwave sintering at a relatively low temperature of 1200°C. The grain size of the fibre samples sintered using the microwave technique was finer than that produced by conventional sintering. These results show that microwave sintering is a promising technique for processing mullite fibres.     

A Comparative Study of Densification of Sol‐Gel‐Derived Nano‐Mullite due to the Influence of Iron,Nickel and Copper Ions

By sol‐gel process, mullite samples doped with 0.002M, 0.02M, 0.1M, 0.15M, and 0.2M of iron, nickel, and copper are prepared. Prepared gels were then dried, grinded, pressed into pellets, and sintered at temperatures 1000°C and 1300°C for 4 h. Mullite densification behavior was analyzed. Our intention is to study the role of metal ions in influencing mullitization behavior in the case of the sol‐gel reaction process, to provide useful information of mullite. This study deals with the effect of metal ions on mullite formation, microstructure, and densification behavior in single‐phase sol‐gel‐derived mullite.     

Mullite Whiskers from Precursor Gel Powders

A mullite precursor sol was prepared by mixing boehmite and silica sols. On addition of 3.5 wt% F⁻ ion as a 47% solution of HF, the mullite sol was gelled. The dried gel was ball-milled and calcined at 1400°C for 1 h in an airtight container. Mullite whiskers grew on the (111) plane along the 〈001〉 direction.     

溶胶—凝胶法制备莫来石粉末

以硝酸和正硅酸乙酯为主要原料，采用溶胶－凝胶法制备莫来石粉末，并利用DSC技术和XRD技术研究了莫来石的形成过程、物相组成，制定出合理的煅烧温度。     

Fabrication and mechanical properties of SiC platelet reinforced mullite matrix composites

Hot-pressing of mullite and SiC–mullite matrix composites was performed at temperatures and pressures between 1500 and 1650°C and 5 and 15 MPa, respectively. Composites were produced using different precursors; sol–gel derived mullite and kaolinite/α-alumina. The precursor did not strongly affect the optimum density achieved, reaching 97·5% of theoretical for a 20 vol% SiC addition in both cases. The SiC platelet addition impaired densification kinetics in all composites compared to mullite monoliths. Fracture toughness, measured by the indentation strength in bending technique, was marginally higher for the sol–gel precursor material in both monolith and composite. Fracture toughness increased with SiC content for both materials. For example, for the sol-gel precursor material it increased from 2.9±0.1 MPa m^1/2 for the monolith to 3.9±0.1 MPa m^1/2 for the 20 vol% SiC composite. Similarly, hardness increased with SiC addition for both materials, but the hardness of the sol–gel material was greater than that of the kaolinite+α-alumina material for all compositions. The relationship between microstructure and mechanical properties is discussed.     

Hybrid Gels for Homoepitactic Nucleation of Mullite

Hybrid gels, defined as gels from mixtures of polymerically and colloidally derived sols, offer many opportunities for crystalline microstructure development upon heating. In this study, hybrid mullite gels are formed by mixing a colloidal boehmite—silica sol with a polymeric aluminum nitrate—tetraethoxysilane-derived sol. The polymeric gel crystallizes in situ to form mullite that acts as seed crystals for homoepitactic nucleation during the subsequent transformation of the colloidal component of the hybrid gel. Compared with the entirely colloidal gel, the introduction of a 30 wt% polymeric gel fraction results in an increase in apparent nucleation frequency from ∼5x10¹¹ to ∼1x10¹⁴ nuclei / cm³ at 1375°C, a reduction in high-temperature grain size from 1.4 to 0.4 μm at 1550°C, and an increase in the degree of microstructural homogeneity, as evidenced by intragranular pore removal.