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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 table2.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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| 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
