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All samples contained white fused alumina (Union, Korea) as aggregates. In the AS (A), the 22wt% alumina richspinel (AR-78, Almatis, Netherland) was used without addition of microsilica, however, in the ASM (B, C), and 2.5wt% magnesia(dead-burnt magnesia 95wt%, d≤75㎛ were used with varying the additive amount of microsilica.And 5wt% calcium aluminate cement (Secar71, Kerneos, France), which played role as a binder, and microsilica(with differeent contents such as 0.5wt% and 0.7wt%; 971U, Elkem, Norway) were used as well. The chemical composition of the experimental specimen and of raw materials are shown in table 1 and table
2.In order to analyze the expansion behavior of castables, all the specimens were heated up to 1700℃ in RUL (refractoriness under load of 0.2MPa). And the thermal linear expansion rate (at 1600℃) were measured. And the all the specimens were prefired at 1000℃ to obtain sufficient mechanical strength. The HMOR (hot modulus of rupture) was measured at 1400℃ by using specimens with the size of 160mmⅹ40mmⅹ40mm.
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真强必胜: 金币+2, 谢谢 2014-09-23 12:47:05
英语留级生: 金币+10, 翻译EPI+1, ★★★★★最佳答案, 非常非常感谢 2014-09-23 13:42:10
所有样品都含有白刚玉(欧盟,韩国)作为骨料。AS(A)含22%(重量)的氧化铝尖晶石(AR-78,安迈,荷兰),无需另加硅微粉即可使用,但ASM(B,C)含和2.5%(重量)agnesia(重烧氧化镁95%(重量)、d≤75㎛,使用时另加不同数量的微硅粉。5%(重量)铝酸钙水泥(Secar71,凯诺斯,法国)作为粘合剂和微硅粉(不同的含量,如0.5%(重量)和0.7%(重量); 971U,埃肯,挪威),试验样品的化学成分和原材料见表1和表2。为了分析浇注料的膨胀行为,所有试样均加热到1700℃的RUL(0.2MPa负载下的耐热度)。测定线性热膨胀系数(1600℃)。所有样品均预烧至1000℃,以获得足够的机械强度。在1400℃条件下,用160mmⅹ40mmⅹ40mm大小的样本测定HMOR(热断裂模量)。
2楼2014-09-22 22:14:16
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