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对二氧化钒超细粉末的各种制备方法、应用及进展情况进行了综述,并指出了二氧化钒超细粉末制备技术的发展方向。 相似文献
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直接碳化法制备碳化钒的热力学分析 总被引:1,自引:0,他引:1
对以五氧化二钒为原料制备碳化钒的工艺过程进行热力学分析,分析结果表明:钒氧化物在转化过程中遵循逐级还原理论;钒氧化物在碳化过程中,不转化为金属钒,直接转化为碳化钒;二氧化钒的碳化温度最低,为1018K,因此,在钒氧化物的转化过程中,应尽可能使其转化为二氧化钒。若采用气相还原碳化的方法,则可通过调节气体的流量、配比对还原碳化工艺进行控制。 相似文献
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通过将纳米二氧化钒粉体制备成纳米二氧化钒浆料添加到甲基丙烯酸甲酯的预聚体中,在低温和高温聚合的条件下得到具有红外智能隔热的有机玻璃。通过扫描电镜、光学性能以及隔热性能的测试对智能隔热有机玻璃进行表征,研究了纳米二氧化钒粉体形貌及纳米二氧化钒浆料的不同添加量对聚甲基丙烯酸甲酯的光学性能和红外隔热性能的影响。结果表明:用形貌为球形、粒径为50 nm的二氧化钒粉体制备得到的纳米二氧化钒浆料,且纳米二氧化钒浆料添加量为10%时,获得的纳米二氧化钒智能隔热有机玻璃性能相对最好,其可见光透过率为40%,红外阻隔率为85%,紫外阻隔率为99%。 相似文献
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实验结果表明,M17铸造高温合金(%:0.16C、8.79Cr、5.79A1、4.93Ti、3.29Mo、15.20Co、0.78V、0.015B、0.073Zr、0.002S、0.001P、0.001 1O、0.001 0N)经25 kg真空感应炉返回重熔后,Si含量随重熔次数的增加而略有增加,合金中主要元素和其它杂质元素S、P、H的含量变化不大,而氧、氮略有增加;合金中初生碳化物由新合金中的草书体逐渐向返回合金块状转变,初生碳化物的遗传性堵塞合金凝固时的补缩通道,使返回料合金的疏松倾向增大,高温塑性下降较大。 相似文献
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<正>Minmetals Resources acquired the world’s largest copper mine under construction for USD5.85 billion.One after another,listed companies Jien Nickle,China Molybdenum and Chihong Zinc and Germanium raised money to get involved in overseas mining projects…SOEs and private enterprises are engaged in a frenzy of overseas mine purchasing.A reporter with Economic 相似文献
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正Judging from China’s copper consumption field,the biggest consumption unit is electric power,which accounts for 47%of total consumption;it is followed by light industry sector,including household electrical appliance,machinery,durable goods and hardware etc,which accounts for 22%of total consumption;followed by transportation field, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正In 2013,the Central Geological Prospecting Fund(CGPF)Project newly discovered 15 ore fields,including 3 large above ore fields,and 5medium sized ore fields.The reporter learned from the recently published"Annual Report of Central Geological Prospecting Fund Project(2013)"that,from 2006 to 2013 the CGPF 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正This year,the investment growth rate of real estate industry continued to slow down,sold area of commercial housing also dropped significantly,which brought huge pressure to the domestic air conditioning manufactures.In the first half of the year,by relying on high growth in national financial expenditure,along with investment in public infrastructure 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
正Kang Yi,Honorary Chairman of China Nonferrous Metals Industry Association,said recently at the Forum on Development of the Non-ferrous Metals Industry in Central and Western China held in Zhengzhou that,as more and more electrolytic aluminum factories in Xinjiang came into operation,the electrolytic aluminum output of Xinjiang had reached2,275,000 tons in the first 7 months this year, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
正"Xinjiang project has been completed according to schedule,but total completion and total start of production are two different concepts,after completion it still needs a gradual process of reaching production target."On the morning of November 3,Shenhuo Coal Industry and Electricity Power told investors the above statement on the investor interaction platform. 相似文献
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正The reporter learned from Guangdong Province Precious Metal Transaction Center that in 2013the Center maintained healthy development momentum,and had become the second largest precious metal transaction platform in China in terms of market size;currently Guangdong is quickening steps of financial innovation for the Center,aiming to build a transaction center with international core competitiveness. 相似文献