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英語(yǔ)留級(jí)生銅蟲 (小有名氣)
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[求助]
求大神幫忙翻譯一小段英語(yǔ)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
鐵桿木蟲 (著名寫手)
- 翻譯EPI: 73
- 應(yīng)助: 72 (初中生)
- 金幣: 10669.3
- 散金: 3999
- 紅花: 17
- 帖子: 2100
- 在線: 530小時(shí)
- 蟲號(hào): 3346786
- 注冊(cè): 2014-07-31
- 專業(yè): 有機(jī)分子功能材料化學(xué)
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RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-09-11 23:53:48
英語(yǔ)留級(jí)生: 金幣+15, 翻譯EPI+1 2014-09-12 09:53:56
RXMCDM: 金幣+1, 多謝應(yīng)助！ 2014-09-11 23:53:48
英語(yǔ)留級(jí)生: 金幣+15, 翻譯EPI+1 2014-09-12 09:53:56
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材料和技術(shù)（方法） 具有顯著自由膨脹水平(AM13 AM45和AM100)【7】的鋁鎂澆注料，被用于評(píng)價(jià)材料的燒結(jié)過(guò)程中結(jié)構(gòu)約束環(huán)境的影響。片狀氧化鋁(T - 60 D≤6毫米，安邁，德國(guó))被選為粗骨料，對(duì)原位尖晶石的反應(yīng)，活性氧化鋁(CL370、安邁、德國(guó))和重?zé)趸V(95 wt %的氧化鎂，CaO/SiO2比= 0.37 Magnesita Refratários S. A.，巴西)被添加到澆注基質(zhì)中。組成成分還包括6 wt %的鋁酸鈣水泥(Secar 71、70 wt %的氧化鋁Kerneos，美國(guó))作為粘結(jié)劑和1 wt %硅粉(971 U、Elkem、挪威)。澆注料配方中唯一的變量是氧化鎂粒度(Dmax ≤ 13, ≤ 45 and ≤ 100 μm)，并確保不改變化學(xué)成分的不同膨脹水平。混合后，在振動(dòng)下制備柱狀樣品(150 x 25 x 25 mm3)，在潮濕的環(huán)境中(相對(duì)濕度100%)50°C下熟化24 h，在110°C干燥24 h和600°C (1°C/min)焙燒5 h。然后樣品在兩個(gè)不同的結(jié)構(gòu)條件下1500°C火燒5h：自由膨脹和約束條件。根據(jù)呈現(xiàn)在圖1的示意圖，制備了一種具有高機(jī)械強(qiáng)度 (6 wt %的CAC) 的水泥粘結(jié)的高鋁質(zhì)澆注料 (3 pt彎曲試驗(yàn)下σf > 50 MPa)，并澆鑄鋁鎂樣品從而實(shí)施所需的約束。 |
2樓2014-09-11 22:42:52
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