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求大神帮忙翻译一小段英语片段，急急急
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MATERIALS AND TECHNIQUES Alumina-magnesia castables with distinct free expansion levels (AM13, AM45 and AM100)7 were used for evaluating the effect of a structural constrained environment during the material’s sintering. Tabular alumina (T- 60, D ≤ 6 mm, Almatis, Germany) was selected as coarse aggregates and, for the in situ spinel reaction, reactive alumina (CL370, Almatis, Germany) and dead-burnt magnesia (95 wt% of MgO, CaO/SiO2 ratio = 0.37 Magnesita Refratários S. A., Brazil) were added to the castable matrix. The compositions also comprised 6 wt% of calcium aluminate cement (Secar 71, 70 wt% of Al2O3, Kerneos, USA) as the binder agent and 1 wt% of microsilica (971 U, Elkem, Norway). The only variable in the castables’ formulations was the magnesia grain size (Dmax ≤ 13, ≤ 45 and ≤ 100 μm), which ensured different expansion levels without changing the chemical composition. After mixing, prismatic samples (150 x 25 x 25 mm3) were prepared under vibration, cured for 24h at 50°C in a humid environment (100% of relative humidity), dried for 24h at 110°C and calcined at 600°C (1°C/min) for 5h. The samples were then fired at 1500°C for 5 hours in two different structural conditions: expansion free and under constraint. A cement-bonded (6 wt% of CAC) highalumina castable with high mechanical strength (σf > 50 MPa under 3pt bending testing) was produced and cast around the alumina-magnesia samples in order to impose the desired constraint, according to the sketch presented in Figure 1. |
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cmds1907
铁杆木虫 (著名写手)
- 翻译EPI: 73
- 应助: 72 (初中生)
- 金币: 10944.8
- 散金: 3999
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- 虫号: 3346786
- 注册: 2014-07-31
- 专业: 有机分子功能材料化学
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RXMCDM: 金币+1, 多谢应助！ 2014-09-11 23:53:48
英语留级生: 金币+15, 翻译EPI+1 2014-09-12 09:53:56
RXMCDM: 金币+1, 多谢应助！ 2014-09-11 23:53:48
英语留级生: 金币+15, 翻译EPI+1 2014-09-12 09:53:56
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材料和技术（方法） 具有显著自由膨胀水平(AM13 AM45和AM100)【7】的铝镁浇注料，被用于评价材料的烧结过程中结构约束环境的影响。片状氧化铝(T - 60 D≤6毫米，安迈，德国)被选为粗骨料，对原位尖晶石的反应，活性氧化铝(CL370、安迈、德国)和重烧氧化镁(95 wt %的氧化镁，CaO/SiO2比= 0.37 Magnesita Refratários S. A.，巴西)被添加到浇注基质中。组成成分还包括6 wt %的铝酸钙水泥(Secar 71、70 wt %的氧化铝Kerneos，美国)作为粘结剂和1 wt %硅粉(971 U、Elkem、挪威)。浇注料配方中唯一的变量是氧化镁粒度(Dmax ≤ 13, ≤ 45 and ≤ 100 μm)，并确保不改变化学成分的不同膨胀水平。混合后，在振动下制备柱状样品(150 x 25 x 25 mm3)，在潮湿的环境中(相对湿度100%)50°C下熟化24 h，在110°C干燥24 h和600°C (1°C/min)焙烧5 h。然后样品在两个不同的结构条件下1500°C火烧5h：自由膨胀和约束条件。根据呈现在图1的示意图，制备了一种具有高机械强度 (6 wt %的CAC) 的水泥粘结的高铝质浇注料 (3 pt弯曲试验下σf > 50 MPa)，并浇铸铝镁样品从而实施所需的约束。 |
2楼2014-09-11 22:42:52
