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高性能陶瓷创新工艺--陶瓷胶态注射成型技术 总被引:7,自引:0,他引:7
成型工艺作为制备高性能陶瓷材料及部件的关键技术,介绍黄勇教授创新提出的把胶态成型和注射成型结合的“陶瓷胶态注射成型新工艺”。 相似文献
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羟基磷灰石陶瓷成型与烧结工艺研究 总被引:3,自引:0,他引:3
以磷酸钙为原料用煅烧新工艺制备了羟基灰石粉末,并以此为原料采用凝胶浇注成工艺制备了羟基磷灰石陶瓷坯体,研究了不同成型工艺制备的羟基磷灰石陶瓷坯体的性能。借助DTA、XRD等分析了陶瓷坯体在烧结过程中的物理化学和晶相转变。 相似文献
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陶瓷直接凝固注模(DCC)成型 总被引:6,自引:0,他引:6
直接凝固注模式型(DCC)是一种陶瓷净尺寸胶态成型方法,DCC成型的坯体具有成型密度高,密度及组分分布均匀,不含或只含少量有机物等特点,本文了DCC成型的原理、成型过程及特点。 相似文献
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本文采用低毒的MAM-MBAM凝胶体系代替AM-MBAM有毒体系制备95氧化铝陶瓷,为改善成型后坯体的性能,在凝胶注模成型过程中给予浆料压力.研究发现在压力为0.3 MPa时获得的坯体表面光洁,线收缩率大,体密度高,结构均匀,成品率高,质量好.本文还并研究了压力对95氧化铝陶瓷烧结体线收缩率和体密度以及洛氏硬度的影响.实验结果表明:压力辅助凝胶注模成型所得坯体烧结后性能优于无压直接注模成型坯体,压力为0.3MPa时线收缩率最小,体密度最高可达3.81 g/cm3,洛氏硬度最高.坯体显微结构显示,陶瓷粉料被有机高分子网络很好地粘结在一起,并且压力注模的坯体中陶瓷粉料堆积紧密,结构均匀致密.烧结后,压力注模成型坯体晶粒发育良好,气孔较无压直接注模烧结体少,烧结致密性能优异. 相似文献
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结构陶瓷的新型凝胶注模成型技术研究与进展 总被引:1,自引:0,他引:1
凝胶注模成型是一种先进的陶瓷成型方法,为高性能复杂形状陶瓷的制备提供了有效的技术途径.凝胶注模常用的体系为丙烯酰胺,但由于丙烯酰胺单体具有神经毒性,因此限制了其应用范围.近十余年来无毒体系凝胶注模成型技术受到了国内外学者的广泛重视.本文综述了无毒性凝胶大分子的种类,凝胶成型的基本原理、工艺过程及国内外最新研究成果.这种无毒性凝胶体系具有环境友好、有机物含量少、坯体均匀等优点,将成为今后凝胶注模成型发展的一个重要方向. 相似文献
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精密陶瓷原位凝固制备技术的研究 总被引:11,自引:3,他引:11
七十年代末,世界范围内伴随着陶瓷热机部件的热潮,精密陶瓷受到了各国政府、研究部门及产业界的充分重视。进入九十年代后,精密陶瓷的发展遇到了许多问题,其中形状复杂结构部件的成型工艺是制造高性能陶瓷材料最为关键的环节之一。本文综合分析了近年来精密陶瓷成型工艺的研究进展,着重强调指出砂位凝固成型技术是保证坯体均匀性和解决高性能陶瓷可靠性的重要环节,同时,指出成型工艺今后需要加强和解决的几个关键技术。 相似文献
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Gelcasting is a well-established colloidal processing method with a short forming time, high yields, high green capacity and low-cost machining, and has been used to prepare high-quality and complex-shaped dense/porous ceramic parts. In this article, we reviewed recent developments in gelcasting technology for ceramic preparation. For environmental pollution reduction during ceramic preparation by gelcasting, the development of low-toxic and nontoxic gelcasting systems is discussed. The occurrence and control of inner stress and surface-exfoliation in ceramic green bodies prepared by gelcasting are analyzed, and then some methods to control and eliminate the inner stress and surface-exfoliation in ceramic gelcast green bodies, especially for colloidal injection molding of ceramics (CIMC) are proposed. Finally, the applications of gelcasting for the fabrication of porous ceramics and complex-shaped ceramics (e.g., microbeads, rutile capacitor, thin-wall rutile tube, refractory nozzle) are summarized. 相似文献
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George V. Franks Carolina Tallon André R. Studart Mitchell L. Sesso Silvia Leo 《Journal of the American Ceramic Society》2017,100(2):458-490
Colloidal processing of fine ceramic powders enables the production of complex shaped ceramics with unique micro and macro structures which are not possible to produce via conventional dry processing routes. Because of this enhanced structural control and shaping capabilities, colloidal processing has been exploited to produce ceramic components with ever increasing complexity and functionalities. In this review, we revisit some of the research efforts on this topic to highlight its relevance and growing importance for the advanced manufacturing of functional ceramics. Selected examples of colloidal systems with increasing level of complexity are discussed to showcase the wide range of structures that can be generated through wet processing approaches. The historical development and background knowledge pertaining to colloids and surface interactions is first briefly reviewed. The major colloidal shape forming and additive manufacturing processes that utilize colloidal pastes and inks are then reviewed, highlighting the control of suspension rheology needed in these techniques. Next, methodologies that combine suspended particles with a pore‐forming phase are discussed as a means to produce porous ceramic materials. Further control over the interactions between anisotropic particles and their alignment in suspensions can be gained via externally applied fields (such as magnetic) to produce texturally aligned green bodies. This leads to bioinspired ceramics that can programmably morph into complex shaped objects upon sintering. Hierarchical porous structures with high mechanical efficiency are also shown as an example of the multiscale designs that can be generated through advanced colloidal processing. As drying of ceramic bodies is an inevitable consequence of wet colloidal processing, the current understanding of this critical processing step is reviewed. Finally, the gaps in knowledge in these fields are discussed to provide our perspective on where the field may support advances in ceramics in the future. 相似文献
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Colloidal forming is a novel wet-processing way to prepare complex shaped ceramic parts with high reliability at low cost. In this article, the transformation mechanisms from suspension to green body and the development of colloidal forming are reviewed. The transformation from suspension to green body in colloidal forming is mainly dependent on the characteristics of suspension, and solidification is the key link in colloidal forming. Various colloidal forming methods are developed to produce ceramic parts, and these methods include slip casting, tape casting, direct coagulation casting, injection molding, gel-casting and so on. The study of defects during colloidal forming should be focused on the defects formation, inheritance and evolution during drying, de-binding and sintering processes. External free controllable technology of colloidal forming is an effective way to achieve ceramic fabrication industrialization, and stress-free colloidal forming is important for the future development of ceramic fabrication. 相似文献
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关于陶瓷成型工艺的讨论 总被引:19,自引:0,他引:19
陶瓷制造经历数千年历史,直到20世纪中叶因为烧结理论的创立获得了飞速发展,上世纪七八十年代关于超细粉体制备和表征的发展,促使陶瓷工艺第二次大发展,当前阻碍陶瓷材料进一步发展的关键之一是成型工艺技术没有突破,压力成型不能满足形状复杂性和密度均匀性的要求,传统的湿法成型工艺可以获得复杂形状,但不能保证坯体的均匀性,90年代以来发展起来的多种胶体原位成型工艺和气相成型工艺有望促使成型工艺获得突破。 相似文献
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《Journal of the European Ceramic Society》2019,39(2-3):547-553
Although the near-net-shape forming ability of gelcasting has been well demonstrated, current attention mainly was focused on manufacturing compact ceramics. In this work we demonstrated that the combination of the gelcasting technique and the ceramic sintering process could prepare the near-net-shape through-pore hydroxyapatite (HAP) ceramics, in which the pore diameter at the range of < 2 μm could be adjusted by changing the content of HAP in green bodies and with the aid of alcohol immersion. Experiments demonstrated that the gels in green bodies and alcohol immersion played important roles in improving the strength of green bodies and decreasing the shrinkage and deformation of green bodies, and thus improving the through-pore and near-net-shape forming of HAP ceramics. Such method reported here possibly extends the gelcasting technique to manufacture other through-pore ceramics for precise filtration, protein separation, or high performance liquid chromatography. 相似文献
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高性能陶瓷成型工艺进展 总被引:20,自引:0,他引:20
本文论述了高性能陶瓷成型工艺的和重要性,重点介绍了陶瓷胶态成型工艺的研究进展及陶瓷成型工艺的最新动向,提出了瓷成型工艺研究中必须重视和加强的若干研究领域。 相似文献