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本文介绍了耐火纤维毯、耐火纤维折叠块的性能,缓冷坑的工作条件,以及本厂在炉盖部位采用该新型耐火材料的效果和效益,展示了耐火纤维折叠块的应用前景。 相似文献
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一、前言陶瓷耐火纤维作为工业炉的耐火绝热材料,目前,虽已开始应用于1300~1400℃高温的锻造加热炉上,但由于陶瓷耐火纤维在1000℃以上的高温中会产生结晶、收缩、纤维劣化等缺点,使陶瓷耐火纤维的推广应用受到了影响,目前应用在1000℃以上高温中还不多。为了探讨陶瓷耐火纤维的高温特性及在锻造加热炉上的应用,本文主要介绍一下有关陶瓷耐火纤维的综合试验结果。 相似文献
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耐火纤维包扎加热炉炉筋管是一种新的隔热工艺。针对不同温度段,采用不同材质的耐火纤维,再辅以相应的技术措施,就会收到事半功倍的节能效果。本文根据我厂采用耐火纤维包扎炉筋管的实践,对耐火纤维包扎工艺,有关包扎材料及理化性能和节能效益作一些论述与总结。 相似文献
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针对通常耐火纤维喷涂中存在的问题,分析耐火纤维喷涂用结合剂的性能要求和常用结合剂的结合机理,完成了不同使用温度条件下耐火纤维喷涂用结合剂的实验研究。通过实际应用,取得了优良的使用效果。 相似文献
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为了减少工业炉的蓄热,提高生产效率,国外广泛推广采用耐火纤维和体积密度为0.8克/厘米~3以下的高强度轻质砖。采用这两种耐火材料均可以有效地减少炉体蓄热,降低空载功率,提高工业炉的热工性能。近几年,我国在耐火纤维的研制和推广方面取得了不少成绩,但由于目前国产耐火纤维只能局限于中温使用,质量不够稳定,强度差,因此要将耐火纤维用于电炉产品还有许多困难。除了尽快提高耐火纤维质量, 相似文献
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1耐火纤维的发展概况
耐火纤维是上世纪40年代后期由美国首先研制出来的一种轻质隔热材料,最初用于宇航工业和高温窑炉膨胀缝作填料,60年代末应用于工业窑炉内衬取得了显著的节能效果。1973年全世界出现能源危机时,各国竞相发展耐火纤维材料,应用范围也逐渐扩大。据有关部门统计,近二十年来,国际市场对耐火纤维的需求迅速增长,几乎每年以10~15%的速度递增。1966年全世界耐火纤维产量只有0.5万吨,目前已突破30万吨,北美的美国和加拿大是生产大国,其次是西欧、日本和南美。 相似文献
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耐火纤维作为工业炉窑的炉衬在我国已普遍推广使用。耐火纤维具有导热系数小,重量轻,热损失少等特点。几年来耐火纤维的应用实践证明,节能可达10~30%左右,引起了各方面的高度重视。我国的耐火纤维工业是从七十年代末期发展起来的,存在着设备简陋、生产工艺落后,原材料的纯度处理不完善,应用工艺缺乏研究,用户对产品 相似文献
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汽车摩擦材料增强纤维的选用 总被引:1,自引:1,他引:0
对汽车摩擦材料中增强纤维的选用做了一综述性总结。探讨了石棉、铜纤维、玻璃纤维、碳纤维、有机纤维、矿物纤维及混杂纤维等在摩擦材料中应用的优缺点及对摩擦材料性能的影响。指出石棉及代用纤维增强摩擦材料在我国一段时期内还将共存,并逐步转向无石棉半金属基摩擦材料,最终将向高性能纤维增强材料过渡。增强纤维也将由单一纤维变为混杂纤维。 相似文献
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Titanium matrix composites (TMCs) reinforced with Sigma 1140+ SiC fiber have been manufactured by a combination of low pressure
plasma spraying (LPPS spray/wind) and simultaneous fiber winding, followed by vacuum hot pressing (VHP). Fiber damage during
TMC manufacture has been evaluated by measuring fiber tensile strength after fiber extraction from the TMCs at various processing
stages, followed by fitting of these data to a Weibull distribution function. The LPPS spray/wind processing caused a decrease
in mean fiber strength and Weibull modulus in comparison with as-received fibers. A number of fiber surface flaws, primarily
in the outer C layer of the fiber, formed as a result of mechanical impact of poorly melted particles from the plasma spray.
Coarse feedstock powders promoted an increase in the population of fiber surface flaws, leading to significant reduction in
fiber strength. The VHP consolidation promoted further development of fiber surface flaws by fiber bending and stress localization
because of nonuniform matrix shrinkage, resulting in further degradation in fiber strength. In the extreme case of fibers
touching, the stress concentration on the fibers was sufficient to cause fiber cracking. Fractographic studies revealed that
low strength fibers failed by surface flaw induced failure and contained a large fracture mirror zone. Compared with the more
widely investigated foil-fiber-foil route to manufacture TMCs, LPPS/VHP resulted in less degradation in fiber strength for
Sigma 1140+ fiber. Preliminary results for Textron SCS-6 fiber indicated a much greater tolerance to LPPS/VHP damage. 相似文献
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天然纤维增强聚合物基摩擦材料的研究 总被引:1,自引:0,他引:1
文章介绍了天然纤维主要是剑麻纤维与苎麻纤维的组成与性能,总结了剑麻纤维与苎麻纤维常用的物理和化学改性方法;简述了几种潜在能作为摩擦材料基体的热塑性树脂的性能,综述了天然纤维增强聚合物基复合材料以及天然纤维增强聚合物基摩擦材料的研究进展,最后得出由于天然纤维以及热塑性树脂的优异性能,天然纤维增强热塑性树脂摩擦材料的研究将会产生重大意义。 相似文献
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Research on photodarkening in rare earth doped fibers 总被引:1,自引:0,他引:1
成煜 《中国稀土学报(英文版)》2012,30(11):1102-1105
Samarium doped aluminosilicate fiber was fabricated by modified chemical vapor deposition (MCVD) process.The optical properties of this fiber were characterized by white light source and OSA.The photodarkening property of the fiber was measured by an Ar+ laser. The experiment results proved that the samarium doped aluminosilicate fiber had better photodarkening resistance than that of the samarium doped germanosilicate fiber. A brief explanation showed that the photodarkening loss could be reduced by changing the fiber core’s material from germanosilicate to aluminosilicate. Samarium doped aluminosilicate fiber was very promising for the red fiber laser application. 相似文献
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SC Stevenson M Rollence B White L Weaver A McClelland 《Canadian Metallurgical Quarterly》1995,69(5):2850-2857
The adenovirus fiber protein is responsible for attachment of the virion to cell surface receptors. The identity of the cellular receptor which mediates binding is unknown, although there is evidence suggesting that two distinct adenovirus receptors interact with the group C (adenovirus type 5 [Ad5]) and the group B (Ad3) adenoviruses. In order to define the determinants of adenovirus receptor specificity, we have carried out a series of competition binding experiments using recombinant native fiber polypeptides from Ad5 and Ad3 and chimeric fiber proteins in which the head domains of Ad5 and Ad3 were exchanged. Specific binding of fiber to HeLa cell receptors was assessed with radiolabeled protein synthesized in vitro, and by competition analysis with baculovirus-expressed fiber protein. Fiber produced in vitro was found as both monomer and trimer, but only the assembled trimers had receptor binding activity. Competition data support the conclusion that Ad5 and Ad3 interact with different cellular receptors. The Ad5 receptor distribution on several cell lines was assessed with a fiber binding flow cytometric assay. HeLa cells were found to express high levels of receptor, while CHO and human diploid fibroblasts did not. A chimeric fiber containing the Ad5 fiber head domain blocked the binding of Ad5 fiber but not Ad3 fiber. Similarly, a chimeric fiber containing the Ad3 fiber head blocked the binding of labeled Ad3 fiber but not Ad5 fiber. In addition, the isolated Ad3 fiber head domain competed effectively with labeled Ad3 fiber for binding to HeLa cell receptors. These results demonstrate that the determinants of receptor binding are located in the head domain of the fiber and that the isolated head domain is capable of trimerization and binding to cellular receptors. Our results also show that it is possible to change the receptor specificity of the fiber protein by manipulation of sequences contained in the head domain. Modification or replacement of the fiber head domain with novel ligands may permit adenovirus vectors with new receptor specificities which could be useful for targeted gene delivery in vivo to be engineered. 相似文献
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钢纤维与硅氧铝陶瓷纤维对树脂基摩擦材料性能的影响 总被引:1,自引:0,他引:1
钢纤维和陶瓷纤维由于各自的特性在摩擦材料行业中成为非常重要的非石棉纤维.采用粉末冶金法制备纤维增强树脂基摩擦材料,对比研究以钢纤维和硅氧铝陶瓷纤维作为增强材料对树脂基摩擦材料摩擦和磨损性能的影响.结果表明,硅氧铝陶瓷纤维和钢纤维对材料摩擦因数和磨损率的影响均较复杂;钢纤维的添加量(质量百分数)为20%-25%、硅氧铝陶... 相似文献
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An analytical model has been formulated for the drying shrinkage performance of a fiber-reinforced cementitious composite. The model is based on the assumption that shear stress is produced between the fiber and surrounding matrix as the matrix shrinks. This shear stress in turn influences the matrix deformation behavior resulting in macroscopic composite shrinkage lower than that of a pure cement-based matrix. Through systematic derivation, a free shrinkage expression, which reflects the influences of the matrix and fiber properties as well as fiber orientation characteristics, is presented. A parametric study, including the influence of elastic moduli of the fiber and matrix, fiber dimension, and fiber content in the case of 3D fiber distribution, is carried out. The model results indicate that shrinkage of a fiber-reinforced cement-based composite is significantly influenced by elastic moduli of fiber and matrix as well as fiber length and thickness (i.e., diameter for fiber with a circular cross section). Model predictions based on independent parametric inputs compare favorably with experimental measurements of free shrinkage of fiber-reinforced mortar and concrete. 相似文献