信息集锦

佛陶研究所推出新产品金刚泡沫陶瓷过滤器 佛山市陶瓷研究所科研人员经过一年多的努力,成功开发出高技术陶瓷产品：金刚牌高强度耐热泡沫陶瓷过滤器。 泡沫陶瓷过滤器因其具有高孔隙率（70～95）%,过滤压头损失少,大的几何表面积,曲折的流径,以及良好的物理化学稳定性和耐高温性能,已在熔融金属液体的过滤方面得到了广泛的应用,特别是在高档金属铸件和精密铸造生产工艺中得到应用。与传统的过滤器如直孔陶瓷过滤片和玻璃纤维布相比,泡沫陶瓷过滤器不仅可以过滤熔融金属液体中的氧化物、碳化物、氮化物等非金属杂质和部分气体,还可…     

泡沫陶瓷过滤器用聚氨酯网状海绵的应用研究

本文简单介绍了聚氨酯泡沫海绵的分类,阐述了泡沫陶瓷过滤器用聚氨酯海绵载体的性能指标要求。对比了氧化锆、碳化硅和氧化铝泡沫陶瓷过滤器分别所需聚氨酯海绵性能指标;通过试验发现,不同材质的泡沫陶瓷过滤器所需聚氨酯海绵的强度、弹性、比重、熔点等指标性能也不一样。其中,氧化锆材质泡沫陶瓷过滤器对聚氨酯海绵强度和弹性要求最高,其次碳化硅质、氧化铝质泡沫陶瓷过滤器。试验还发现,聚氨酯海绵性能对泡沫陶瓷产品收缩、通孔率和强度有较大影响,其中通孔率影响最大。     

下注钢锭的钢水过滤

陶瘊泡沫过滤器已成功地应用于下注钢锭的浇铸，钢水的洁净度提高了３０倍并减少了气体夹带。自从６０年代中期陶瓷泡沫过滤器首次用于处理铝合金以来，陶瓷材料的发展及浇铸操作技术的提高已使它们的应用扩大到包括熔模精密铸造钢铸造及工业铸件方面。现已证明使用陶瓷泡沫滤器过滤钢水的效益很好。把这种过滤的理论扩大到连铸生产中的尝试，到现在为止才刚刚获得初步成功，在应用中当过滤器捕集夹杂物时，大量的这滤水在提供足够的     

专利信息

一种微波介电玻璃陶瓷的制备方法;铸造用镁质泡沫陶瓷过滤器的制备方法;一种低温烧成多孔陶瓷支撑体的制备方法;陶瓷涂屡烧结彩砂及其制备方法;多功能陶瓷色料及其制作方法;一种波聚合技术制备接枝改性陶瓷粉体的方法;     

铸造用泡沫陶瓷过滤器的生产工艺

本文详细介绍了泡沫陶瓷过滤器的生产工艺,并简单介绍了其过滤机理。对海绵加工、浆料调节及产品烧结等生产工序分别作了阐述,并提出了生产过滤器的技术要求和铸造使用过程中的注意事项。     

泡沫陶瓷的制备方法及应用

泡沫陶瓷具有气孔率高、耐高温、抗化学腐蚀、热稳定性好等优良性能,被广泛用作金属液过滤器、高温气体和离子交换过滤器、催化剂载体等方面.介绍了泡沫陶瓷的制备方法,以及不同方法制备泡沫陶瓷的特点;并列举了泡沫陶瓷在过滤器、催化剂载体、节能隔热材料、吸声材料和生物材料等方面的应用;最后指出了当前泡沫陶瓷的研究热点和今后发展需要解决的问题.     

陶瓷和有关专利(三)

85104601复合型轻质保温耐火材料及制造 85100415一种用添加生物多糖取代粘土成分的瓷器熔块釉浆 851。。384氮化硅工程陶瓷烧结新工艺 85108809分析熔窑气氛的方法与设备 85102441陶瓷短焰燃烧器 85100942沉淀二氧化硅绝热体 8510017了高耐磨性高韧性氮化硅基陶瓷刀具材料 85201642铝金属陶瓷压力锅 85100381排蜡陶瓷玻璃组合式盆景 85100034二氧化锡导电陶瓷 85103011高韧性氮化硅基陶瓷刀具材料及其制造方法 85108680低温烧制陶瓷组合物 85102359铸造专用泡沫陶瓷过滤器 86102146泡沫陶瓷体及其制造方法 85107386陶瓷材料的致密化方法 86…     

汽车柴油机排气颗粒泡沫陶瓷过滤器的研制

着重论述了汽车柴油机排气颗粒泡沫陶瓷过滤器滤芯的性能要求，确定了泡沫陶瓷过滤器的配方、工艺和结构。所制得泡沫陶瓷的性能：抗弯强度为1．5MPa；膨胀系数为2．89×10－6／K－1；耐温性为1300℃．用此泡沫陶瓷做成的滤芯碳颗粒过滤效率为50％左右。根据台架试验与性能检测结果数据，集中讨论了工艺、添加剂和滤芯结构的影响。     

金刚企业：特种陶瓷产品再现高技术实力

以佛山市陶瓷研究所为母体的金刚企业,不仅以陶瓷辊棒风靡海内外陶瓷界,更以其特种陶瓷产品在多个行业享有盛名。最近,其泡沫陶瓷过滤器和球石、耐火材料就分别在第六届上海铸造展和第七届淄博陶博会上备受关注,再次彰显出金刚企业科技孵化的高技术实力。     

添加剂对SiC-Al2O3陶瓷过滤器性能的影响

采用有机泡沫浸渍工艺制备泡沫陶瓷过滤器.研究添加剂SiO2微粉和CeO2对碳化硅-氧化铝基泡沫陶瓷过滤器的影响.采用正交实验并对陶瓷进行性能检测,结果表明,SiO2,微粉和CeO2的加入量与烧成温度之间存在最佳配比.采用最佳配方在1 380℃下制得的碳化硅-氧化铝基泡沫陶瓷过滤器常温抗压强度为2.10Mpa,热震稳定性为20次.     

常温固化免烧结泡沫陶瓷复合材料的制备及性能

利用自制的粘结剂,选用合适的填料、悬浮剂和减水剂,表面活性剂等附加剂,采用聚氨酯泡沫塑料先驱体挂浆成形法和常温固化工艺,制备出具有均匀、相互贯通孔结构的免烧结泡沫陶瓷复合材料,其生产工序简单,生产成本低,同时由于聚氨酯泡沫塑料载体保留其中,所以产品韧性好,不易脆断,研究结果表明：随着粘结剂加入量的提高和泡沫塑料载体孔径的减小,泡沫陶瓷复合材料的抗压强度显著增大,但通孔率明显降低es用适当浓度的碱液对泡沫塑料进行表面改性处理,可显著降低其表面张力,提高表面粗糙度,还能溶解残留的封孔薄膜,从增加挂浆量,提高其力学性能,但随着泡沫塑料载体表面改性处理时间的延长,泡沫陶瓷复合材料的通孔率下降bde着常温固化时间的延长,泡沫陶瓷复合材料的抗压强度逐步上升,常温固化28d时,其抗压强度基本上达到最大值。     

Al2O3基泡沫陶瓷的研究

以Al2O3和锆英石为主要原料制备了具较高强度及抗热震性的泡沫陶瓷并进行了性能研究与应用试验。结果表明：当锆英石含量为30%时,材料的抗弯强度最大,达3.84MPa;随锆英石含量的提高,抗热震性能增强;泡沫陶瓷的孔隙率与锆英石含量无关,为80-81%,泡沫陶瓷过滤器能有效滤除铸液中夹杂物。     

Synthesis of a foam ceramic based on ceramic tile polishing waste using SiC as foaming agent

Due to the large amount of ceramic tile polishing waste generated in China, the recycling of this waste residue becomes important. Herein a foam ceramic was successfully produced by using ceramic tile polishing waste as main raw material. In this research, SiC was added as the foam agent, and the foaming mechanism was also investigated. The results showed that the best dosage of SiC was 1%. Furthermore, in order to obtain a foam ceramic with better structure, the sodium phosphate was added in raw materials as foam stabilizer. The influence of this addition on the microstructure and properties of foam ceramic was investigated. It was found that the optimum additive amount of sodium phosphate is 2–3%.     

Production of ceramic foam filters for molten metal filtration using expanded polystyrene

Filtration of molten metals with ceramic foam filters is a proven method in order to remove the inclusions. This paper develops a new approach for the production of ceramic foam filters. In the conventional method of ceramic foam filter production, polyurethane sponges are used.In this work, ceramic foam filter was produced by using expanded polystyrene. Polystyrene is expanded in a specially designed mold by steam to form polystyrene patterns. Various ceramic slurries are then poured into the polystyrene cell and allowed to air dry. After the shaping operation, filters are subjected to sintering process under various conditions. By this new method, filter channel sizes can be controlled and traps with desired configurations can be formed. Some tests were applied to the produced filters. Thermal shock tests ensured that the filters could withstand temperatures of 1450 °C. Water absorption test showed that bauxide based material absorbed water more than the others.     

Fracture mechanics analysis of delamination buckling of a porous ceramic foam coating from elastic substrates

Ceramic foams are ideal materials for thermal protection systems such as those used as a thermal shield on the space shuttle. The working temperature difference between the outer and inner surfaces of the ceramic foam is extremely high. Under this adverse condition, the ceramic foam coating could buckle from its underneath structures. Therefore, the general problem of damage due to buckling delamination of a ceramic coating on an elastic substrate is investigated in this paper. The delamination buckling amplitude and the stress intensity factor at the tip of buckling region are derived in closed form in terms of the porosity of the ceramic foam. Based on the maximum amplitude and the critical stress intensity factor criteria, critical temperatures of coating buckling from the substrate are established. A fitting formula of maximum buckling amplitude as a function of outer surface temperature is given. It is found that higher porosity and length-to-thickness ratio of the coating will result in a smaller stress intensity factor. However, it seems that the buckling amplitude is independent of the porosity of ceramic foams.     

AS型泡沫陶瓷过滤器的研制

详细说明了用网状弹性聚氨基甲酸乙脂切片浸渍陶瓷料浆研制AS型泡沫陶瓷过滤器的工艺。采用非磷酸盐添加剂粘合,由碳化硅、氧化铝、硅胶及少量硅酸铝纤维制成的AS型泡沫陶瓷过滤器抗压强度可达1．65MPa而厚度仅为15mm,并且不会造成环境污染,完全可以满足过滤铁熔液的要求。     

大型泡沫陶瓷过滤板的研制

研究了有色金属连铸、半连铸过滤用大型泡沫陶瓷板的工艺技术配方及生产控制参数。研究的D_(25)系列泡沫陶瓷制品,可在1350℃～1460℃范围内快速烧成,烧成合格率高于95％。制品性能及各项理化指标均符合生产使用要求。     

The microstructural characterization and mechanical response of YSZ ceramic foams fabricated via volume-controlled foaming

Yttria-stabilized zirconia (YSZ) ceramic foams are a promising class of materials for lightweight, high specific strength catalyst supports or insulation. Foam morphology is one of the most significant factors that dominate the mechanical properties of the YSZ ceramic foams. However, the foam morphology as a function of gravity and foam film strength for YSZ ceramic foams has been seldom reported up to now. Our work focuses on YSZ ceramic foams fabricated via a novel foam-gelcasting method using Isobam as gelling agent. The relative magnitudes of the foam film strength and the gravitational force can be changed by controlling the foaming yield of slurries. Both the remaining high-temperature strength and the critical difference temperature (△T_c) of YSZ (3.0) ceramic foams were higher than those of YSZ (5.0) ceramic foams, mainly owing to high closed-cells and relatively uniform distributed pore structure. In addition, the YSZ ceramic foams could not break suddenly like dense ceramics. This work demonstrates that tuning the foaming yield of slurries is a viable route to improved thermomechanical property in ceramic foams for use as insulation or catalyst supports in extreme environments.     

Immobilization of lipase on chemically modified bimodal ceramic foams for olive oil hydrolysis

The work reported in this paper is aimed at exploring the feasibility of immobilizing alkali lipase from Penicillium expansum on a bimodal ceramic foam, which has both macro- and micro-pore structures. After being chemically modified with a silane coupling agent, the ceramic foam was used as a support for lipase immobilization. To determine the preferable immobilization conditions, the effects of the amount of enzyme for loading, immobilization time, temperature, and pH on enzyme activity were investigated. The results showed that the chemically modified ceramic foam has a high loading capacity and a strong binding ability for the lipase. Thanks to the low internal mass transfer resistance, the ceramic foam has greatly enhanced the rate of immobilization. As a comparison, the immobilized-lipase activity was much higher than that on many frequently used porous materials like diatomite, alumina and activated carbon.     

碳化硅泡沫陶瓷空气吸热器性能数值模拟

基于Dymola软件平台,建立了以碳化硅泡沫陶瓷为吸热体的塔式太阳能热发电用空气吸热器一维动态仿真模型。模型结合了Rosseland辐射传递方程,并考虑了空气物性随温度及压强的变化。使用Modelica语言编写程序,并由该语言对代数微分方程自动求解。通过分析仿真结果,剖析空气吸热器工作过程的传热特性,得出投入辐射能热通量、吸热体厚度、平均孔径等参数对空气、吸热体温度及系统达到稳定所需时间的影响,为该类空气吸热器的设计提供了理论依据。