陶瓷窑炉气氛场对陶瓷纤维使用寿命的影响

本文利用实验室气氛炉模拟陶瓷窑炉实际工况,让陶瓷纤维在不同气氛场下暴露加热,探讨气氛对陶瓷纤维使用寿命的影响,对陶瓷纤维在陶瓷窑炉上的应用有一定指导意义。     

陶瓷窑炉内陶瓷纤维的高温粉化及抗粉化的研究

由于陶瓷窑中使用环境恶劣,不但有气氛问题,更有各种釉料产生的釉汽的侵蚀、水汽侵蚀及高速气流的搅动,故陶瓷纤维在陶瓷窑炉中高温粉化严重。本文以辊道窑为例剖析了陶瓷纤维粉化概貌及其在窑炉工程使用中的缺陷,提出了研究陶瓷纤维粉化的设想及抗粉化的方法。     

陶瓷纤维在辊道窑中高温粉化过程的初析

本文综述了陶瓷纤维分类、主要成份及性能,结合辊道窑的结构特点及陶瓷烧成的工艺特点,分析了热应力、气氛制度、坯釉烧成及燃料燃烧所产生的有害成份、窑内的速度场及窑体结构等对陶瓷纤维粉化的影响,并提出了应用模拟研究的方法探讨陶瓷纤维粉化与各影响因素之间的定量关系,探讨了陶瓷纤维使用寿命的预测方法和在辊道窑使用中的抗粉化方法。     

陶瓷窑炉基础性研究浅析及展望

本文论述了计算机模拟和实型模拟两种研究方法在当前陶瓷窑炉热工研究领域的应用,在计算机模拟中着重分析了流体动力过程的模拟、传热过程的模拟、窑炉燃烧过程及气化过程的模拟、陶瓷烧成过程的模拟研究及陶瓷材料热物性研究及计算机仿真等,并就目前国内窑炉应用这两种方法进行研究的现状及所取得的一些成果进行分析。     

脉冲燃烧技术在陶瓷窑炉上的应用

本文介绍了一种新的窑炉燃烧控制技术－脉冲燃烧控制技术，对其原理和优势进行阐述，并对这种技术在陶瓷窑炉中的应用作了详细的探讨。     

陶瓷纤维在梭式窑上应用的探讨

介绍了陶瓷纤维在陶瓷窑炉上的应用,并针对应用中存在的一些问题提出了看法,为陶瓷纤维的实际应用提供参考.由于其容量大大低于其它耐火材料,物理特性完全不同于传统耐火材料,因为蓄热很小,隔热效果明显,作为炉衬材料可大大降低能源损耗.     

国外新型高温窑炉

1 前言 随着技术陶瓷和工业陶瓷产业的发展,对高温窑炉的要求也不断提高。世界各国厂商不断推出最新的高温窑炉,以满足不同产品的特定要求,它们的共同特点是温度和气氛控制日趋精确,使产品尽可能地以所希望的曲线来烧成,窑炉也更趋节能和实用。本文简要介绍几种新的窑炉。     

陶瓷纤维催化滤管制备及在玻璃窑炉中的脱硝应用

针对本公司自主开发的陶瓷纤维滤管,以纳米钒钛催化剂为浆料,采用真空浸渍的方式制备具有除尘、脱硝双功能的陶瓷纤维催化滤管,考察了催化剂负载率、过滤面速度和粉尘对脱硝性能及压降的影响.结果表明,催化剂负载率与过滤面速度增加均导致滤管压降增加,而NOx转化效率呈现相反变化趋势.在除尘脱硝一体化实验中,脱硝效率随着反复清灰过程...     

碳化硅-堇青石复相陶瓷窑具材料的制备及表征

本文对碳化硅、堇青石的优点整合制备碳化硅/堇青石复相陶瓷窑具,并从力学性能方面研究了碳化硅及堇青石的含量对复相窑具性能的影响,确定碳化硅含量在75%,堇青石含量在8%~10%得到性能优异的复相陶瓷窑具,同时对烧成温度进行了研究,发现在1 390℃下保温3小时有利于产品的完全烧结。通过X-射线衍射(XRD)分析,复相陶瓷窑具中并未有杂质相出现。     

陶瓷窑炉墙体新型砌筑方法与节能

辊道窑是陶瓷工业的新型窑炉,其具有很多优点。有利于实现烧成工序的机械化与自动化,是快速烧成较理想的窑炉,但由于辊子长度的限制。窑墙结构较薄;但无论窑炉多先进,耗热大还是陶瓷窑炉的重要课题。笔者曾对窑墙散热计算时发现。在不改变耐火材料及保温材料的厚度及种类。只改变耐火材料及保温材料的砌筑方法,得到不同保温性能,从而可进一步探讨改进辊道窑窑墙结构的方案。     

Elytra-mimetic ceramic fiber aerogel with excellent mechanical,anti-oxidation,and thermal insulation properties

High-performance thermally insulating aerogel with low density, high porosity, and low thermal conductivity characteristics was widely used in heat insulation. However, the large-scale application of aerogel was still limited by its brittleness and infrared radiation transparency at high-temperature. Fiber composite aerogel had achieved significant progress, but its anti-oxidation ability was poor, and its thermal insulation required further improvement at ultra-high temperatures. Herein, inspired by the structure of elytra, nanoparticle fiber (NF) was prepared by electrospinning of coaxial fiber loaded with opacifier and antioxidant nanoparticles. The NF was incorporated into the SiBCN aerogel to prepare NF/SiBCN ceramic fiber aerogel. The mechanical properties were improved by fiber networks. The shell structure increased the antioxidant properties. Heat conduction and heat convection were suppressed by the aerogel, while heat radiation was reduced by the coaxial fiber. The results showed that the ceramic fiber aerogel exhibited superior mechanical, antioxidant, and ultra-low thermal conductivity properties.     

陶瓷行业窑炉尾气余热的充分利用

为了充分利用陶瓷行业窑炉尾气的余热，使用了热管式空气预热器回收余热并加热二次风，使配风由冷风变成热风，达到了节能目的。介绍了热管式空气预热器的用途、特点、使用方法。     

Properties of ceramic fiber reinforced cement composites

Mechanical properties and preliminary durability of ceramic fiber reinforced Portland cement composites tested with wet-hot accelerating method were investigated. The results showed that the flexural strength of mortar could be increased obviously by adding ceramic fiber into it, but the effect of the flexural reinforcement was influenced by various factors, including fiber length, fiber content and kinds of matrices; the preliminary durability of ceramic fiber in ordinary Portland cement tested with wet-hot accelerating method was much better than that of alkali-resistant (AR) glass fiber. The mechanism of the durability of ceramic fiber in ordinary Portland cement is also discussed.     

Effect of hafnium oxide on continuous aluminum oxide-mullite-hafnium oxide composite ceramic fibers

The Al₂O₃-mullite-HfO₂ (AMH) ceramic fiber with a 20 wt% of HfO₂ has demonstrated good tensile strength and good high-temperature stability due to the tiny diameter and small grains even at high temperatures. To investigate the effect of HfO₂ on crystal behavior and high-temperature performance, continuous AMH ceramic fibers with different HfO₂ contents (0 wt%, 10 wt%, and 50 wt%) were prepared by melt-spinning of polymer precursors. The effect of HfO₂ on the crystal form transition process, mechanical properties, and high-temperature resistance of AMH fibers was studied by in-situ XRD and STEM. The AMH fibers with 50 wt% HfO₂ had the highest strength retention rate of 78.33% after heat treatment at 1200 °C for 0.5 h. After 0.5 h of heat treatment at 1500 °C, the grain size of the AMH fibers with 50 wt% HfO₂ was still less than 200 nm.     

Fabrication of glass ceramic sealants with ceramic fiber filler for solid oxide fuel cells

In this study, ceramic fibers are used as a filler material for glass ceramic sealant in solid oxide fuel cells to improve the thermal cycle behavior. Beside the bare glass ceramic sealant for comparison, multilayered sealants with different ceramic fiber contents are fabricated to investigate the effect of ceramic fiber quantity also. The mechanical performances of the samples are measured via tensile tests by placing them between two metallic interconnector plates after the glass formation process as well as after 1, 5 and 10 thermal cycles. The results show that the mechanical strength in general tends to decrease with increasing the ceramic filler content, which can be attributed to poor adhesion due to reduced glass ceramic composition. On the other hand, thermal cycle behavior of the samples with ceramic fibers is found to be improved at some extend. This may be due to the behavior of ceramic filler network and relatively slow crystallization with increasing the amount of the filler as proven by microstructural observations. Especially for the sample including 4 ceramic fiber interlayers each having 0.030 g ceramic fibers, the mechanical strength shows an increasing trend with the number of thermal cycles.     

莫来石-堇青石窑具的现状与发展前景

叙述了我国窑具行业的现状和存在的问题。阐述了新型莫来石－堇青石窑具的工艺特点以及与国外窑具的差距。论述了我国发展莫来石－堇青石窑具的迫切性、自身优势和广阔的市场前景。     

石灰回转窑的技术特点及发展前景

回顾了2013年度石灰回转窑的建设情况以及回转窑的技术进步和技术特点,并重点介绍了1 000t·d-1回转窑焙烧系统。指出了回转窑存在的主要问题和解决办法。回转窑技术成熟、产品质量好、燃料适应能力强,今后的发展前景较好。     

Development of ceramic fiber reinforced glass ceramic sealants for microtubular solid oxide fuel cells

Ceramic fibers in various forms with different fiber sizes are tested to improve the sealing performance of glass ceramic seals for microtubular solid oxide fuel cell applications. In this regard, several sealing pastes are prepared by mixing each ceramic fibers type with glass ceramics at 1.25 wt %. Five layered microtubular anode supported cells are also fabricated by extrusion and dip coating methods to evaluate the sealing performance of the composite sealants. The pastes are applied between the cells and gas manifolds made of Crofer22 APU. The electrochemical and sealing performances at an operating temperature of 800 °C under hydrogen are investigated after the glass forming process. Microstructures of the sealants are also examined by a scanning electron microscope. Experimental investigations reveal that the cells sealed by the pastes with ceramic bulk fiber and ceramic fiber rope gasket show acceptable open circuit potentials close to the theoretical one. These cells can be also pressurized up to around 150 kPa back pressure in the sealing performance tests. On the other hand, the pastes without any filler, with ceramic rope and with ceramic blanket exhibit poor sealing performance due to gas leakage originated from flowing of the main glass ceramic matrix from the joints. Therefore, ceramic bulk fiber and ceramic fiber rope gasket are found to behave as a stopper and can be used to prevent glass ceramics from flowing for microtubular solid oxide fuel cells or similar applications.