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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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二、成型方法新词汇胶态成型 Colloidal Forming Process 陶瓷的成型方法一般可归纳为干法和湿法两大类。湿法成型又可分为塑性成型和胶态成型两种,后者指的是高分散陶瓷悬浮体湿法成型中的一种方法。传统的胶 相似文献
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陶瓷制造经历数千年历史,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。本文介绍了胶态成型,固体无模成型工艺及气态成型,对上述工艺的原理、工艺过程及特点进行比较,提出了陶瓷成型工艺的关键问题。并介绍了水基非塑性浆料的注射成型新工艺。 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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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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Colloidal crystals of polymeric or inorganic microspheres are of extensive interest due to their potential applications in such as sensing, optics, photonic bandgap and surface patterning. The article highlights a set of approaches developed in our group, which are efficient to prepare colloidal crystals with ordered voids, patterned colloidal crystals on non-planar surfaces, heterogeneous colloidal crystals of different building blocks, colloidal crystals composed of non-spherical polyhedrons, and colloidal crystals of non-close-packed colloidal microspheres in particular. The use of these colloidal crystals as templates for different microstructures range from nanoscale to micron-scale is also summarized. 相似文献
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Nina V. Dziomkina 《Polymer》2009,50(24):5713-17342
A fabrication method of colloidal crystals possessing the BCC crystal structure is described. BCC colloidal crystals with a thickness of up to seven colloidal layers were grown in the direction of the (100) crystal plane. Defect free colloidal crystals with a homogeneous surface coverage were obtained over a surface area of several square millimeters. Quality and thickness of grown colloidal crystals were controlled by a set of deposition parameters such as deposition voltage, deposition time, and concentration of colloidal particles in the colloidal suspension, colloid surface charge density and withdrawal speed of electrodes out of the suspension. Optimal deposition parameters leading to a controlled BCC colloidal crystal growth were established. 相似文献
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In this work the reliability of the focused-ion-beam (FIB) patterning on polystyrene (PS) colloidal crystals at different
scales is determined. Ordered arrays of PS spheres (465 nm) are successfully modified by selectively removing a single sphere.
The water-vapor assisted FIB milling is crucial to obtain this result. Furthermore, isolated PS spheres are FIB drilled with
or without chemically enhanced milling aiming at the exploration of the limits of such a technique. These controlled defects
created using the FIB-assisted techniques may be helpful in preparing mockups of photonic crystals, sensors or as colloidal
masks for diverse lithographic processes. 相似文献
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Protective agents based on tetraethoxysilane (TEOS) have been widely used for the protection of stone heritages. However, TEOS-based protective agents suffer from practical drawbacks, such as crack formation of the gel during the drying phase due to the developed capillary force, which is typical for TEOS-based protective agents. In this paper, we have prepared new TEOS-based protective agent containing flexible hydroxyl-terminated polydimethylsiloxane (PDMS-OH) and colloidal silica particles (167 nm) using n-octylamine as a catalyst in order to reduce capillary force development and increase hydrophobicity, and have characterized them for the application of stone protective agent. The extent of surface hydrophobization depends on concentration of colloidal silica particles and reaches a maximum value of 123° at 0.2% (w/v) of colloidal silica particles for the case of treated with the modified composition. The presence of n-octylamine is a key factor which promotes the increase of the gel pore size. The protective performances were also evaluated by its ability to resist acid corrosion. The results reveal that the protective effects are satisfying. 相似文献
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破伤风抗体胶体金检测试剂盒的研制 总被引:1,自引:0,他引:1
目的 研制破伤风抗体胶体金检测试剂盒。方法 应用胶体金免疫斑点法研制破伤风抗体胶体金检测试剂盒,并对破伤风类毒素免疫的豚鼠及人血清的破伤风抗体水平进行测定。结果 该试剂盒所测定的结果与小鼠体内法的相关性好(r>0.95,P=0.25),远优于目前使用的间接血凝法(r<0.10);且该试剂盒的灵敏度较小鼠法高1倍,特异性强,无交叉反应,精密准确。结论 可用于临床检测患者创伤后的血清破伤风抗体水平。 相似文献
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Tomoki Ogoshi 《Polymer》2006,47(11):4036-4041
New colloidal polymer hybrids with polyoxazolines such as poly(2-methyl-2-oxazoline) (PMeOZO) and poly(2-ethyl-2-oxazoline) (PEtOZO) were obtained in an aqueous solution as a sol-gel solvent. The polyoxazoline segment was incorporated into the siliceous particle and formed strong hydrogen bonds with silanol moieties, judging from TGA and FT-IR studies. Colloidal polymer hybrids exhibited no glass transition temperature of the polyoxazoline and showed excellent thermal stability and solvent-resistant property. Porous silica obtained by charring the colloidal polymer hybrids at 600 °C exhibited the peak at 3.5 Å. These results strongly indicate the homogeneous molecular scale dispersion of polyoxazoline in the colloidal silica gel matrix. 相似文献
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S. Mintova N. Petkov K. Karaghiosoff T. Bein 《Microporous and mesoporous materials》2001,50(2-3):121-128
Si-MEL molecular sieve is prepared from aged colloidal precursor solutions under hydrothermal treatment (HT) at 90 °C. In situ dynamic light scattering (DLS) investigations of the precursor solutions and the crystalline Si-MEL sols are performed with the original concentrations. Sub-colloidal particles with a mean radius of about 1 nm and colloidal aggregates with a radius of 10 nm are detected in the precursor colloidal solutions after 5 h aging at room temperature. Consumption of the sub-colloidal particles with time and an increase of the colloidal fraction of 10 nm particles after 48 h aging is observed. After heating of the aged precursor solution at 90 °C for 30 h, three particle populations of 1, 10, and 100 nm radius are formed. Complete transformation from amorphous to crystalline colloidal particles is observed after 68 h extended HT of the aged precursor solution. The mean hydrodynamic radius of the crystalline Si-MEL particles is about 100 nm based on the DLS measurements. The size of the MEL crystals was also confirmed with SEM. Additional time-dependent 29Si NMR measurements of the aged precursor colloidal solutions prior to further crystal growth show that the amount of Q0 species (δ=−71.2) decreases, while signals of high intensity in the range between δ=−88.6 and −98.9 indicating the formation of Q36 and Q38 silicon species appear. IR data reveal that with aging of the precursor colloidal solutions at room temperature, an increased ordering of the silica species similar to those found in the final MEL product is observed. 相似文献