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考登钢作为一种高耐候结构钢,广泛应用于各个领域。在火力发电方面,考登钢主要应用在工作环境比较恶劣的烟气加热器和空气预热器中。考登钢表面涂搪的目的就是进一步提高其耐腐蚀性能,延长使用寿命。为了提高考登钢元件的使用寿命,对考登钢表面涂搪瓷的可行性、密着性能、瓷釉、工艺控制、质量保证等方面进行了研究。 相似文献
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超长钢管的涂搪和烧成是搪瓷行业的一项技术难题,本文研究开发了长度超过6 m钢管的涂搪和烧制工艺。采用搪瓷粉末静电喷涂(干搪),电阻炉预热和中频感应加热,成功研发出长度超过6 m的钢管搪瓷,得到的搪瓷钢管瓷层厚度均匀,管体挺直不变形,搪瓷表面光滑致密,耐酸、耐热冲击性能优异。超长的搪瓷管可用于极端环境,例如烟气换热器(GGH)。 相似文献
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烟气脱硫脱硝是解决烟气中硫氧化物和氮氧化物对环境污染的最有效措施。搪瓷换热元件以其独特的耐酸性能、耐磨性能以及耐温急变性能等在烟气脱硫脱硝中起着其它材料所不能替代的作用。叙述了烟气脱硫脱硝的基本原理以及搪瓷换热元件特性,介绍了国内外搪瓷换热元件的生产工艺,同时分析了搪瓷换热元件在国内的市场前景。 相似文献
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为了研究高温热管太阳能接收器的传热性能,研究了其基本传热元件——高温热管在相应工作条件下的导热性能.基于高温热管半周向加热条件下传热特性试验的结论,研究了高温热管接收器工作时太阳辐射与热管温差的对应关系,从而得出太阳直射辐射与高温热管当量导热系数的关系.研究结果表明:太阳辐射强度对高温热管的当量导热系数具有重要影响,随着太阳辐射的增强,高温热管当量导热系数不断增大,当太阳辐照度1 000 W/m^2时,当量导热系数达11 400 W/(m.K).表明高温热管太阳能接收器在工作环境中,太阳辐射越强,传热性能越好. 相似文献
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和陶瓷基板一样,钢板搪瓷基板可以在其上印刷,烧成厚膜电阻器和厚膜导电线路。但陶瓷基板却不能构成厚膜电容器和穿孔厚膜引线。如前所述,在基板上形成各种工艺诱导元件(PIC)是搪瓷电路基板的优势。然而,普通的或称日用的或称商用的搪瓷板用来制造厚膜混合电路存在着许多问题。因此,对用于直接在基板上制造厚膜元件的搪瓷电路基板应具有下列要求: 相似文献
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<正> 在工业生产中,搪瓷反应锅应用范围很广,尤其是化学工业。化学工艺过程的种种化学变化,如带有腐蚀性或需避免铁质污染的化学反应,常在搪瓷反应锅中进行。一般搪瓷反应锅都有夹套,通冷却水(或加热),冷却水自下口进入,从上口溢浣而出。这种普通进水方式,水流往往处于层流状态,传热系数小,传热效果差,这对于放热反应较大,反应温度控制很严的化学反应就十分困难。例如生产食用羧甲基纤维素钠时的碱化、醚化反应,要控制温度不能太高,以保证产品质量,对传热提出了很高的要求。还有其它化学反应,如氯乙烯聚合等对传热也是一个很重要的研究课题。总之对放热反应使用喷嘴冷却技术可带来极大的好处。 相似文献
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利用相平衡原理得出的焦油蒸馏时一次汽化温度的计算方法,其结果与按经验公式的计算结果进行了比较,同时讨论了一次汽化温度与焦油馏分产率及二段蒸发器过热蒸汽用量的关系。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(1):261-275
—Due to its chemistry, no structural adhesive system (epoxies, acrylics, etc.) is likely to offer an ideal combination of toughness, strength, moisture resistance, and ambient-temperature curing. Therefore, for effective use of adhesives in primary structures, an engineer must be able to identify adhesives that represent an optimum compromise among the different properties. In this paper, we present techniques for screening high-strength, ambient-temperature-curing adhesives for (1) moisture resistance under sustained loading and (2) fracture resistance in a way that is directly related to joint performance. 相似文献
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Su Yeon Kwon Jung Hee Shim Yu Ha Kim Chang Su Lim Seong Bae An Inbo Han 《International journal of molecular sciences》2021,22(23)
Whitlockite (WH) is the second most abundant inorganic component of human bone, accounting for approximately 25% of bone tissue. This study investigated the role of WH in bone remodeling and formation in a mouse spinal fusion model. Specifically, morphology and composition analysis, tests of porosity and surface area, thermogravimetric analysis, an ion-release test, and a cell viability test were conducted to analyze the properties of bone substitutes. The MagOss group received WH, Group A received 100% beta-tricalcium phosphate (β-TCP), Group B received 100% hydroxyapatite (HAp), Group C received 30% HAp/70% β-TCP, and Group D received 60% HAp/40% β-TCP (n = 10 each). All mice were sacrificed 6 weeks after implantation, and micro-CT, hematoxylin and eosin (HE) staining, and Masson trichome (MT) staining and immunohistochemistry were performed. The MagOss group showed more homogeneous and smaller grains, and nanopores (<500 nm) were found in only the MagOss group. On micro-CT, the MagOss group showed larger fusion mass and better graft incorporation into the decorticate mouse spine than other groups. In the in vivo experiment with HE staining, the MagOss group showed the highest new bone area (mean: decortication group, 9.50%; A, 15.08%; B, 15.70%; C, 14.76%; D, 14.70%; MagOss, 22.69%; p < 0.0001). In MT staining, the MagOss group demonstrated the highest new bone area (mean: decortication group, 15.62%; A, 21.41%; B, 22.86%; C, 23.07%; D, 22.47%; MagOss, 26.29%; p < 0.0001). In an immunohistochemical analysis for osteocalcin, osteopontin, and CD31, the MagOss group showed a higher positive area than other groups. WH showed comparable bone conductivity to HAp and β-TCP and increased new bone formation. WH is likely to be used as an improved bone substitute with better bone conductivity than HAp and β-TCP. 相似文献
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《China Chemical Reporter》2010,(19)
<正> After June this year China's regions growingmiddle and late rice had widespread blastand sheath/culm blight.Such diseasesplagued 19.2 million hectares.Starting fromJuly the market for new fungicides that cancontrol blast and sheath/culm blight for ricewas more and more active.Makers of traditional pesticides for thecontrol of blast have to contend with fiercecompetition from new pesticides in marketthis year.Kitazine,iprobenfos,isoprothiolane and tricyclazole,oftenused by farmers in the past,are graduallybeing replaced by new varieties with high 相似文献