共查询到18条相似文献,搜索用时 140 毫秒
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多孔陶瓷是人类最早使用的陶瓷材料,也是人类人工合成的第一种材料,它具有良好的物理化学性能,如优异的保温隔热性能和良好的物理化学稳定性。笔者总结了从新石器时代人类开始制备多孔陶瓷的历史发展过程,而且至今多孔陶瓷依旧是人类生活和生产必需的陶瓷产品。多孔陶瓷根据其历史发展过程可分古代多孔陶瓷和现代多孔陶瓷,其制备工艺、装备和制备理论的发展经历了漫长的过程,得到不断完善和进步,依然具有很大发展空间,是当今陶瓷研究的热点之一。 相似文献
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多孔陶瓷是人类最早使用的陶瓷材料,也是人类人工合成的第一种材料,它具有良好的物理化学性能,如优异的保温隔热性能和良好的物理化学稳定性。笔者总结了从新石器时代人类开始制备多孔陶瓷的历史发展过程.而且至今多孔陶瓷依旧是人类生活和生产必需的陶瓷产品。多孔陶瓷根据其历史发展过程可分古代多孔陶瓷和现代多孔陶瓷.其制备工艺、装备和制备理论的发展经历了漫长的过程。得到不断完善和进步,依然具有很大发展空间.是当今陶瓷研究的热点之一。 相似文献
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多孔氮化硅陶瓷材料因其能够充分发挥氮化硅陶瓷和多孔陶瓷两者的优异性能,广泛应用于机械、化工、海洋工程、航空航天等重要领域。制备孔隙率和孔隙结构可控、高强度、低介电常数的氮化硅多孔陶瓷是实现其应用的关键。本文在检索了大量国内专利文献的基础上,对氮化硅多孔陶瓷制备技术信息进行统计和分析,并对其未来技术发展进行了预测。 相似文献
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绿色多功能材料--多孔陶瓷 总被引:2,自引:0,他引:2
多孔陶瓷是一种新型材料,由于其具有较低的热传导等优良性能,而被广泛地应用于众多科学领域.笔者综述了多孔陶瓷的制备工艺、性能及应用,尤其是讨论了多孔陶瓷在各个领域的应用,最后展望了多孔陶瓷的发展前景及今后的发展方向. 相似文献
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《Ceramics International》2019,45(15):18865-18870
Near-net-shape mullite ceramics with high porosity were prepared from ultra-low cost natural aluminosilicate mineral kaolin as raw material and polystyrene micro-sphere (PS) as pore-forming agent. Microstructure, flexural strength, thermal conductivity and dielectric properties of the ceramics were systematically researched. Results show that the porous mullite ceramics possess fibrous skeleton structure formed by a large quantity of interlocked mullite whiskers, which results in good mechanical properties and low-to-zero sintering shrinkage. Flexural strength of the porous mullite ceramics can be up to 41.01 ± 1.12 MPa, even if the porosity is as high as 62.44%. The dielectric constant and loss tangent of the porous mullite ceramics at room temperature are lower than 2.61 and 5.9 × 10−3, respectively. Besides, dielectric constant is very stable with the rising of temperature, and the dielectric loss can be consistently lower than 10−2 when the temperature is not higher than 800 °C. In addition, thermal conductivity at room temperature is as low as 0.163 W/m/K when the porosity of mullite ceramics is 80.05%. The infiltration of SiO2 aerogels (SiO2 AGs) can further decrease the thermal conductivity to 0.075 W/m/K, while has just little effects on the dielectric properties. Excellent mechanical, thermal and dielectric properties show that the porous mullite ceramics have potential applications in radome fields. The porous mullite ceramics prepared from kaolin not only have low cost, but also can achieve near-net-shape. 相似文献
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Certain Principles of Formation of Porous Ceramic Structures. Properties and Applications (A Review)
I. Ya. Guzman 《Glass and Ceramics》2003,60(9-10):280-283
The current state of the production of porous ceramics is considered, mainly for high-temperature applications in various fields of engineering. A classification for these materials is proposed and the most commonly used methods for increasing porosity in ceramics are described. 相似文献
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主要以SiC多孔陶瓷材料为例,综述了多孔陶瓷的4种常用制备方法,即添加造孔剂法,发泡法,有机泡沫浸渍法和溶胶-凝胶法的工艺特点和制品特性,并且列举了制备SiC多孔陶瓷材料的6种特殊方法,包括含硅树脂热解法、固相反应烧结法、气相反应渗入法、流延成型法、固态烧结法和浸渍热解法。文中还给出了多孔陶瓷的性能与表征,介绍了SiC多孔陶瓷材料在过滤材料、催化剂载体、热工材料、吸声材料和复合材料骨架材料方面应用情况,为SiC多孔陶瓷材料的研究和应用开发提供指导意义。 相似文献