粉末冶金发泡法制备泡沫铝工艺研究

泡沫金属是近年来发展起来的一种新型结构功能材料.采用粉末冶金发泡法制备出孔隙率为45%-85%、平均孔径＜5mm的多孔泡沫铝合金试样,并用极差分析法讨论了发泡温度、保温时间和发泡剂的状态对泡沫铝合金的孔隙率的影响,得到了最佳制备工艺条件.     

泡沫铝三明治结构的制备

采用粉末冶金发泡法制备了Ti/Al/Ti,Al/AlSi7／Al泡沫铝芯三明治结构，研究了泡沫铝制备工艺参数的影响，讨论了混粉、压力、温度等对发泡性能的影响，并对泡沫铝制备中的排液现象进行了探讨。     

熔体吹气发泡法制备泡沫铝合金研究

泡沫金属是近年来发展起来的一种新型材料。文章采用熔体吹气发泡法制备出了孔径为5．0—8．3mm，壁厚为0．040—0．076mm，密度为0．19—0．40g／cm^3，孔隙率为85．2％—93．0％的Al—Si泡沫铝合金，并着重讨论了发泡温度、气体流量、SiC粉末体积百分含量对泡沫铝合金形成的孔径和壁厚的影响关系。     

熔体发泡法制备泡沫鋁的缺陷分析

以TiH2作发泡剂，采用熔体发泡法通过控制发泡温度、保温时间、搅拌速度、冷却方式及各种添加剂含量，成功制备出孔结构基本均匀，孔隙率为60％～85％、平均孔径〈3mm泡沫铝样品。重点分析了泡沫铝制备过程中对孔结构稳定性和均匀性影响因素，针对泡沫铝常见缺陷（缩孔、裂纹、局部大孔），出现的原因提出改进措施。     

CaCO3发泡剂制备泡沫铝工艺研究

用CaCO3作发泡剂，用熔体发泡法制备泡沫铝，即Al—Si12在熔融状态下，加入活性剂Mg粉，再与SiC颗粒混合均匀，然后加入发泡剂(CaCO3)搅拌，进行保温发泡，最后冷却。结果表明，对于Al—Si12的合金，用CaCO3作为发泡剂，制备出孔隙结构均匀，平均孔隙率最大、结构均匀的泡沫铝的最优条件是：CaCO3含量1．2％～1．8％，加热温度680～700℃之间，保温时间4～8min之间。     

泡沫铝制备工艺的试验研究

用TiH_2作发泡剂,采用粉末冶金工艺研制出了孔隙率达60％以上,密度在0.9g/cm~3以下的泡沫铝金属材料。试验结果表明:采用本工艺可制备各种形状和规格的泡沫铝,其孔径大小、分布和孔隙度可调控。这种方法制备的泡沫铝具有较好的机械阻尼、吸能减震、吸声隔声和电磁屏蔽性能。     

冷压-溶解-真空烧结法制备泡沫铝的阻尼性能研究

采用冷压-溶解-真空烧结法制备泡沫铝，并用单自由度稳态正弦激励法对制备的不同孔隙度及不同孔径的泡沫铝的阻尼性能进行了研究，讨论了加入Y2O3对泡沫铝阻尼性能和力学性能的影响。结果表明：泡沫铝的阻尼性能随着孔隙度的增加而增加，随着孔径的增大而减小；加入适量的Y2O3可以改善泡沫铝的阻尼性能和力学性能，当Y2O3加入的质量分数为0．5％～0．8％时泡沫铝达到了最佳的阻尼性能和力学性能，但过量的Y2O3将导致阻尼性能和力学性能降低。     

基于PCM法泡沫铝制备工艺的控制及发展

介绍了粉末冶金压制法制备泡沫铝的国内外研究现状,讨论了一些因素对PCM法制备泡沫铝发泡行为及其孔结构的影响。并对PCM法制备大尺寸泡沫铝的工艺做了介绍。最后对PCM法制备泡沫铝合金今后的发展方向和现存问题做了分析。     

粉末冶金泡沫铝制备相关参数研究

在粉末冶金发泡法制备泡沫铝的基础上,研究发泡剂、发泡温度等参数对泡沫铝制备的影响。结果表明,Ti H2的分解峰值温度与铝的熔点十分接近,为640℃,其分解的气体体积是相同质量Ca CO3的30倍,是一种制备高孔隙泡沫铝较好的发泡剂;通过比较研究,发现铝发泡的合适温度为700~750℃,发泡时间宜选择在900 s左右;铝粉表面氧化膜对泡沫铝产生影响,氧化膜质量分数在9.8%左右时,孔隙率达到最大值77%,在氧化膜质量分数为8.2%左右时,孔径最不均匀。     

SiC颗粒自增粘熔体发泡法制备泡沫铝铸锭的组织及其特征分析

通过SiC颗粒自增粘熔体发泡法工艺制备得到泡沫铝基材料的铸锭;对制得的泡沫铝铸锭进行各个层面上不同部位的平均孔径和平均孔隙率的测定,得到了铸锭内部的孔隙率和孔径在铸锭径向和高度方向上的变化规律;并且讨论和研究了熔体未发泡区域的形成原因,得到了熔体直接发泡法制备泡沫材料时气孔的形成过程模型。     

China's Major Non-ferrous Metals Imports & Exports

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Zinc Production by Province in 2014

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80% of Chinese Firms Purchasing Overseas Mines Ended up in the Red

<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     

Copper Processing Profit Dropped Sharply,Copper Consumption Will Face Impact in the Second Half of the Year

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,     

Central Geological Prospecting Fund Newly Added 16.47 Million Tonnes of Bauxite in 2013

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     

Manufacturers of Copper Tube for Central Air Conditioner Use Face Mounting Pressure in the Final Quarter of the Year

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     

Xinjiang Ranks No.1 in Production of Primary Aluminum in China

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,     

Shenhuo Coal Industry and Electricity Power Completed800,000 t/a Aluminum Project in Xinjiang

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.     

Guangdong Metal Transaction Center has Become the Second Largest Precious Metal Transaction Platform Nationwide

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.     

Seven Rare Earth Projects Involving Close to 3 Billion Yuan Investment Landed In the HighTech Zone

正On May 22,Baotou Rare Earth Industry Cooperation Consultation MeetingProject Agreement-signing Ceremony was held in Ningbo,nearly 40 enterprises from Ningbo,Guangdong,Hunan,and Shanxi participated in project consultation.After multi-lateral communication,agreements were signed for a total of 7 rare earth projects successfully.