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In the condition of keeping F、 K、Na content fixed, To improve slag structure and raise slag melting point and viscosity, MgO content is raised and TiO〓 is added. the main content is as follows:(1) Keeping CaO/SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature goes up 106℃, the viscosity goe down at bigger than 1425℃, but difference is little; keeping /SiO〓 fixed, MgO content rises from 10% to 16%, the free running temperature rises 87℃, the viscosity rises too; adding TiO〓 to 5%, the free running temperature goes up 98℃, the viscosity rise a little.(2) Powder crystal x ray diffraction and microscopic analysis shows: increasing MgO content, the cuspidine will decreace or even disappear, the monticellite goes up with MgO content rising, keeping /SiO〓 fixed, Akermanite content goes up, for high melting point minerals appear or go up, the free running temperature of the slag bearing F is raised; Adding TiO〓, high melting point mineral—Perovskite forms, it can making other minerals'crystalling fast, it is the reason that TiO〓 raises the free running temperature of the slag bearing F.
2对测定粘度的冷凝渣所进行的X粉晶衍射及显微分析和鉴定表明,增加MgO含量,渣中枪晶石将减少甚至消失,而钙镁橄榄石则随MgO含量增加而增加,在/SiO〓不变时,黄长石含量也有所增加,高熔点矿物的出现和增加,提高了含氟熔渣的熔化性温度;加入TiO〓熔渣中将形成高熔点矿物-钙钛矿,钙钛矿的形成还促使黄长石的结晶,这是TiO〓提高含氟熔渣熔化性温度的根本原因。
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The results indicate that polyborazine precursor prepared at 150℃ for 10 h and propylamine/isopropylamine molar ratio 2:1, could possess nearly linear molecule skeleton and he prone to melt spinnability. When melt at 90℃, the precursor fibers are prepared with average diameter 10-20μm and BC1.27 N1.52 H structure. After curing process and sintered in NH3 at 1200℃, the near-stoichiometric BN fibers was obtained, which proved this precursor is apt for preparation of BN fibers.
结果表明,当正丙胺/异丙胺摩尔比为2:1,聚合温度为150℃,反应时间为10h时,合成产物具有近似线性分子结构,熔点为90℃,具有良好的成丝性,可获得平均直径10~20μm,组成为BC1.27N1.52H的先驱体纤维,先驱体纤维再经不熔化处理及1200℃氨气高温锻烧等工艺可获得近化学计量比的氮化硼纤维。
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Theoretical analysis reveals that the formation of flower-like splats results from the interaction of surface tension, inhomogeneity of thermal contact resistance between flattening drop and substrate and substrate crater. The formation of the craters on the substrate is mainly controlled by substrate melting.
理论分析表明,&花瓣状&层片的形成是熔体表面张力、熔体与基底接触热阻的不均匀性和基底凹坑相互作用的结果;基底凹坑的形成主要由基底熔化所控制。
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Globe valve:球形阀
有人认为,在大火中不会熔化的金属闸阀和球形阀(globe valve)就是防火阀. 这些阀门的设计和结构能保证它在着火的前后都是金属和金属(metal-to-metal)的接触,这就避免了可燃性流体进入大火这中. 但是,金属阀座在着火前操作时,密封性是不好的.
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infusibility:不溶性
infuser 鼓吹者 | infusibility 不溶性 | infusible 不熔化的
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Tarnish:晦暗
金属支架在陶瓷的烧结过程中不能熔化,而且必须能抵抗产生蠕变或"下陷"(sag)的热应力. 热处理是改变高温下抗蠕变性的另一个方法. 至于抗晦暗(tarnish)性和耐腐蚀(corrosion)性以及其它类似性能,则与口腔中应用的其它合金相同.
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infusible:不熔化的
infusibility 不溶性 | infusible 不熔化的 | infusion 灌输