lxlei@tju.edu.cn
材料科学与工程
无
教授
具有光催化功能的新型余晖发光材料制备

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耐高温超低导热多级孔莫来石纤维类气凝胶复合材料

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氧化铝陶瓷性能测试分析

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xx氮化硅材料研究

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纳米超级隔热材料的研究及在节能领域的应用研究

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型芯涂层材料制备及性能研究

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宽频透波材料研究

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高透波xxxx研究

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xx气凝胶隔热材料

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xx压电织构陶瓷的研究

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xx隔热衬套制备研

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高温隔热涂层材料研究

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微波介质陶瓷

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MT-15-01微波陶瓷研制

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基于相结构双向调控机制的金属氧化物气敏选择性识别与敏感机理研究

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高精度微波介质陶瓷的研制

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耐高温xx涂层研究

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xxxxx头锥研制

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MT-15-02微波陶瓷研制
氧化锆-氧化硅复合气凝胶的制备方法

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一种多孔陶瓷表面氮化硅基涂层的制备方法

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凝胶注模制备O-Sialon多孔及制备方法

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一种氧化锆块体气凝胶的制备方法

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氧化锆气凝胶的制备方法

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溶胶凝胶技术掺杂改性钛酸锶钡材料的方法

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钛酸铋钠-钛酸钡-钛酸铋钾无铅压电织构陶瓷及其制备方法

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多层梯度钛酸锶钡介电陶瓷材料及制备方法
本发明涉及一种氧化锆-氧化硅复合气凝胶的制备方法。将硅氧烷溶于醇，搅拌均匀得到硅氧烷的醇溶液；滴加质量浓度为65～68% 浓硝酸，搅拌均匀后滴加去离子水，继续搅拌；向预水解过的硅氧烷溶液滴加浓硝酸，混合均匀后滴加锆醇盐，搅拌均匀后加入去离子水；继续搅拌，得澄清透明溶胶；将溶胶转移至模具中，静置陈化，得到氧化锆-氧化硅复合湿凝胶；将湿凝胶用老化溶液浸泡；最后用无水乙醇或异丙醇溶剂进行浸泡。本发明制备出了低密度、低导热率的块体氧化锆-氧化硅复合气凝胶。

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本发明涉及一种多孔陶瓷表面氮化硅涂层制备方法，能够改善多孔陶瓷材料力学性能及表面特性，以工艺简单、成本低廉的溶胶凝胶工艺，采用铝溶胶或硅溶胶为分散体系，添加陶瓷粉作为反应骨料，制备铝溶胶或硅溶胶与陶瓷粉混合型料浆，采用浸渍提拉法及喷涂法在多孔陶瓷基体表面涂层，反复涂覆后在低温热处理和高温N2气氛下烧结，制备出与基体结合紧密的氮化硅致密层。采用本专利得到了一种与基体结合紧密、平稳过渡的致密氮化硅涂层，提高了多孔陶瓷的力学性能和表面质量。

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本发明涉及的是一种凝胶注模制备O-Sialon多孔材料及制备方法， 主要包括悬浮体料浆的制备，坯体的制备，干燥，排胶及烧结。采用凝胶注模成型和添加第二相难烧结相（h-BN）相结合的方式，通过原位合成技术制备O-Sialon多孔材料；O-Sialon多孔材料密度在1.1-1.6 g？cm-3，气孔率介于46%-64%之间，室温三点抗弯强度在30-82 MPa之间。

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本发明涉及一种ZrO2块体气凝胶的制备方法，采用锆无机盐为原料，结合阴离子交换技术和溶胶-凝胶技术，以环氧化物为凝胶促进剂制备ZrO2凝胶，并通过螯合剂、分散剂、干燥控制剂等的添加调整凝胶网络和孔结构的均匀性，通过凝胶老化工艺的改进增强凝胶网络骨架强度，再结合高温超临界干燥工艺，制备出了高强度、低密度、低导热系数的ZrO2块体气凝胶。本发明的目的在于提供一种以廉价、对人体无害的锆无机盐为原料制备高性能块体ZrO2气凝胶的方法，使其在高温隔热材料领域有广阔的应用前景。

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本发明提出了一种氧化锆气凝胶的制备方法，将锆醇盐溶于无水乙醇，搅拌混合得到锆醇盐的乙醇溶液；滴加浓硝酸，再加入去离子水、甲酰胺以及环氧丙烷的混合液，继续搅拌20～60 min，得澄清透明溶胶；溶胶转移至模具中，静置陈化得到ZrO2湿凝胶；将湿凝胶用老化溶液在35～100 ℃分别进行浸泡；最后用与干燥介质的溶剂进行浸泡2～5次，所得物进行超临界干燥得到完整块体的ZrO2气凝胶。

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本发明涉及的是通过液相化学中的溶胶凝胶技术掺杂对钛酸锶钡材料进行改性，从而实现对其烧结的促进和介电性能的优化。本发明技术的实现包括：溶胶凝胶法掺杂MgO和MnO2改性钛酸锶钡粉体的制备；溶胶凝胶法掺杂烧结助剂B2O3和Li2O改性钛酸锶钡粉体的制备；微观结构和烧结性能良好，介电性能有明显改善的钛酸锶钡陶瓷烧结体的获得。该技术克服了传统工艺中采用固相混合方法在混合过程中物料掺杂不均匀，导致组成、微观结构及性能上不均匀，从而影响材料特性的问题。该技术对于制造高性能的电子陶瓷材料具有非常重要意义。

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本发明提供一种钛酸铋钠-钛酸钡-钛酸铋钾无铅压电织构陶瓷及其制备方法，以Bi4Ti3O12晶体为模板，将模板与基体粉料、有机溶剂、粘结剂等有机添加剂混合，获得浆料，浆料经流延工艺制备厚度为30-60 μm的膜片，膜片通过层压、切割、排胶、冷等静压后烧结，制得一种高取向生长的BNBK织构陶瓷材料；由于过程中的精确控制，保证材料的原始组分不改变。

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本发明涉及多层梯度钛酸锶钡介电陶瓷材料及制备方法。依顺序以每一层之间流延方向相互交错90°的方式进行叠层，以三层为一周期循环，分别叠3层、6层、9层或12层，多层生坯连成一体。采用流延工艺制备了不同Ba、Sr比的BST厚膜，然后通过叠层、热压工艺制成层状梯度陶瓷材料，达到了对材料进行介电特性调控的目的。多层梯度BST材料样品的介电损耗低，偏场可调性高，与单一配方样品相比，其介电常数温度特性得到了明显改善，介电常数频率稳定性好。
Microstructure, mechanical properties and sintering mechanism of pressureless-sintered porous Si3N4 ceramics with YbF3-MgF2 c

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Hyperelastic and hydrophobic silica aerogels with enhanced compressive strength by using VTES/MTMS as precursors

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Constructing secondary-pore structure by in-situ synthesized mullite whiskers to prepare whiskers aerogels with ultralow ther

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High alpha-beta phase transition and properties of YbF3-added porous Si3N4 ceramics obtained by low temperature pressureless

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Preparation of monoclinic celsian glass-ceramic by a solid- state reaction of the BaO-Al2O3-SiO2eutectic glass, BaAl2O4 an

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Quartz fiber reinforced Al2O3-SiO2 aerogel composite with highly thermal stability by ambient pressure drying

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"Low-temperature sintered porous Si3N4 ceramics using two fluorides as sintering aid"

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Effect of Ca2+ and Mn2+ ions on the radiation properties of LaAlO3

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A novel aerogels/porous Si3N4 ceramics composite with high strength and improved thermal insulation property

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Superelastic and superhydrophobic bacterial cellulose/silica aerogels with hierarchical cellular structure for oil absorption

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"Large-scale and ultra-low thermal conductivity of ZrO2 fibrofelt/ZrO2-SiO2 aerogels composites for thermal insulation"

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Improvement of thermal stability of ZrO2-SiO2 aerogels by an inorganic-organic synergetic surface modification

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Low temperature pressureless sintering of dense silicon nitride using BaO-AL(2)O(3)-SiO2 glass as sintering aid

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Microstructure and properties of pressureless-sintered porous Si3N4 using PMMA as pore-forming agent

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Effect of Glass Phase Content on Structure and Properties of Gradient MoSi2-BaO-Al2O3-SiO2 Coating for Porous Fibrous Insulat

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Super-hydrophobic hexamethyl-disilazane modified ZrO2–SiO2 aerogels with excellent thermal stability

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Enhanced Gas-Sensing Performance of Fe-Doped Ordered Mesoporous NiO with Long-Range Periodicity

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Microstructure and electrical properties in Zn-doped Ba0.85Ca0.15Ti0.90Zr0.10O3piezoelectric ceramics

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Highly textured Ba 0.85 Ca 0.15 Ti 0.90Zr 0.10 O 3 ceramics prepared by reactive template grain growth process

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High-strength mullite fibers reinforced ZrO2-SiO2 aerogels fabricated by rapid gel method

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Ultra-low thermal conductivity and high strength of aerogels/fibrous ceramic composites

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Thermal stability of ZrO2–SiO2 aerogel modified by Fe (III) ion

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Synthesis of crack-free monolithic ZrO2 aerogel modified by SiO2

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Structures and Electrical Properties of Textured Ca-0.85(LiCe)(0.075)Bi4Ti4O15 Ceramics Prepared by the Reactive Templated Gr

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Evolution of textured Ca-0.85(LiCe)(0.075)Bi4Ti4O15 ceramics via templated grain growth using a rolling-extended method

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Non-catalytic vapor Synthesis of millimeter-scale α-Si3N4 nanowires from oxidized silicon powders

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Effect of α-Al2O3 on in situ synthesis low density O-sialon multiphase ceramics

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Crystallographic textured evolution in 0.85Na0.5Bi0.5TiO3–0.04BaTiO3–0.11K0.5Bi0.5TiO3 ceramics prepared by reactive-template

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Two-step sol-gel method for preparing MgO-MnO2-B2O3-Li2O co-added core-shell structural Ba0.55Sr0.40Ca0.05TiO3 powders and th

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A simple sol–gel route for preparing the Barium Strontium Calcium Titanate-Magnesium Oxide composite powders and the sinterin

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Microstructure Modifications and Sintering Mechanism of Ba0.55Sr0.4Ca0.05TiO3 Ceramics Containing Different MgO Additive for

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Effect of sepiolite fiber on the structure and properties of the sepiolite/silica aerogel composite

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Phase analysis and thermal conductivity of in situ O？-sialon/β-Si3N4 composites

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In situ synthesis and phase analysis of low density O`-sialon-based multiphase ceramic

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Formation Mechanism of Plate-like Bi4Ti3O12 Particles in Molten Salt Fluxes Integrated Ferroelectrics

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Modulated Preparation of Monolithic ZrO2 Aerogel

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The Effect of Propylene Oxide on Microstructure of Zirconia Monolithic Aerogel

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The effect of pH of the aging solution on microstructure of silica/zirconia aerogel Key Engineering Materials

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Fe2O3对碳热还原氮化SiO2合成Si2N2O的催化效应及机理

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Coating on Porous Si3N4 Based Substrate with Sol-Gel Slurry

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Preparation of Ba0.55Sr0.4Ca0.05TiO3 Powders by Chemical Co-Precipitation for Low Temperature Sintering Ferroelectric Cerami

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镧铁共掺杂二氧化钛纳米线阵列的可见光催化性能

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回流法制备钒酸铟及其复合二氧化钛可见光催化性能

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SiO2改性ZrO2气凝胶高温稳定性