共查询到20条相似文献,搜索用时 78 毫秒
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紫砂方壶,是紫砂造型中与圆壶、花壶、筋纹壶并列的一大类壶型。方壶造型古朴、形体优美、工艺严谨、气韵生动、技法独特,其整体透露出豪爽、刚劲、正直的阳刚之气,神、气堪比男子。方器造型的特点是方中藏圆,线面挺括平整,轮廓线条分明,给予人们干净利落、明快挺秀之感。整体以直线、横线为主,曲线、细线为辅,器型的中轴线、平衡线要正确、匀挺、富于变化,表现出轮廓分明、平稳庄重的方壶特点。紫砂方壶整体简洁典雅、神形兼备,线条舒展流畅,壶器刚柔相济,性格堪 相似文献
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缠枝纹,又名“转枝纹”、“连枝纹”,是以植物的枝杆或藤蔓作骨架,向上下、左右延伸,形成波线式的二方连续或四方连续,其结构连绵不断,形象委婉多姿,故古人寓意生生不息、万代绵长的美好愿望,从而跻身于中国吉祥纹饰之列。缠枝纹约起源于汉代,盛行于南北朝、隋唐、宋元和明清,广泛用于雕刻、家具、漆器、编织、刺绣、玉器、年画、剪纸、碑刻等工艺美术行业,更是瓷器上最常见的纹样。 相似文献
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C. Wang Y. D. Huang H. Y. Xv W. B. Liu 《International Journal of Adhesion and Adhesives》2004,24(6):471-477
This paper researches the durability of the adhesive/carbon–carbon (C–C) composites joints in salt water with infrared spectroscopy (IR), energy dispersive X-ray spectrosopy (EDX) and shear strength test methods. In salt water, Na+ and Cl− ions can accelerate hydrolyzation of the adhesive and increase water ingress ability in the adhesive, although salt water cannot produce ionization potential between adhesive and C–C composites like adhesive/metal joints. The durability of the adhesive/C–C composites joints in salt water aging is lower than that in humidity aging by shear strength tests. EDX and IR spectra of the adhesive indicate that the salt water diffusion speed in the adhesive/C–C composites joints depend on not only temperature but also salt water aging time, i.e. time–temperature equivalence between temperature and salt water aging time. Shear strength tests also indicate that the rate of shear strength of the adhesive/C–C composites joints treated by silane coupling agent is lower than that treated by sand paper burnishing or by chemical oxidation in salt water aging. 相似文献
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高速耐水金属箔标签胶 总被引:2,自引:0,他引:2
以小麦谷朊粉为主要原料,加入助剂和水,制备金属箔和玻璃粘贴用的蛋白标签胶,探讨了分散剂、交联剂、干酪素、淀粉用量、pH值以及反应温度等因素对此标签胶性能的影响。结果表明,分散剂对谷朊粉在水中的分散起到了极其重要的作用,但会降低标签胶的黏度、耐冰水能力,延长固化时间。交联剂有利于提高标签胶的耐冰水能力、固化速度以及黏度。干酪素主要提高了标签胶的黏度和固化速度,对耐水性和洗脱性影响极小。淀粉起增稠和减少拉丝的作用,但降低了其流动性能。标签胶pH值增大,其黏度增大,固化速度也快。反应温度上升,生产的标签胶黏度下降。标签胶的合适固含量应在40%左右。 相似文献
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《Journal of Adhesion Science and Technology》2013,27(15-16):1699-1710
Durability of adhesively-bonded aluminum joints was investigated by measuring the joint strength using the single-lap shear test before and after exposure to distilled water and seawater. Fractured specimens were examined by photography and scanning electron microscopy to determine the failure modes. Addition of Al particles as much as 50 wt% did not cause any significant decrease in adhesive joint strength. Moreover, varying the Al filler content in the adhesive did not have a significant effect on adhesive behavior in either of the two environments studied. The unexposed adhesive joints failed almost completely in a cohesive (in the adhesive) failure mode. Some decrease in strength was observed in adhesive joints after exposure to both distilled water and seawater for 6 months. The decrease in adhesive joint strength was more significant for specimens immersed in distilled water than those immersed in seawater, probably due to the higher amount of moisture in the adhesive in distilled water than in seawater, as observed in a related moisture diffusion study. The joints exposed to distilled water or sea water failed in more than one mode. The interior part of the adhesive lap area failed in a cohesive mode while an adhesion failure mode was observed near the edges of the adhesive lap area, which is believed to be a result of moisture diffusion through the edges. 相似文献
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耐水性木材用脲醛粘合剂的研究 总被引:6,自引:1,他引:6
研究了改进胶合板用脲醛粘合剂的耐水性的方法。针对脲醛粘合剂耐水性低的原因,提出在胶液中添加碱性物质——耐水添加剂,可显著改善胶合板的耐水性,几种添加剂并用,胶合板可达一级耐水板的水平。 相似文献
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The effect of water redistribution between SKEPT-40 rubbers and reactive adhesives based on SKN-18KTR mixtures with ED-20 on the strength of adhesive compositions was studied. Water vapor sorption isotherms were measured. It was shown that the water content of rubbers during their scheduled conditioning at a humidity of 65–70% leads to the spontaneous redistribution of water between the substrate and the adhesive. This process is accompanied by the retardation of the formation of the adhesive network structure and, as a consequence, by a fall in the strength of adhesive joints. The mechanism of formation and failure of SKEPT-40-(SKN + ED-20) adhesive joints was revealed. A procedure for calculating the amount of water capable of redistributing between the elements of adhesive joints is proposed. Rubber conditioning parameters that ensure the required quality of bonding the rubbers with SKN-18KTR-ED-20 compositions were determined. 相似文献