建筑用铝合金板材高温及耐火性能研究

铝制品在建筑、汽车、航天等行业中被广泛应用,这些铝合金板材都是采用重力铸造等工艺完成的,铸造生产过程中易在板材表面产生针孔,造成铝合金板材不耐火及高温的缺陷。传统的高温及耐火性能测试只能从铝合金板材中的配比元素进行定量分析,无法准确给出铝合金板材耐火及高温的温度,造成了建筑工程使用铝合金板材的很多不确定性。为此,提出一种建筑用铝合金板材高温及耐火性能研究,通过对铝合金板材的加工过程中的使用流形涂料及金属型预热温度,进行氧化钠在高温下形成低熔点化合物的特点,对建筑用铝合金板材的耐火及耐高温温度进行了准确计算。仿真实验表明,本文提出的测试方法比传统方法对建筑用铝合金板材耐火及高温准确性有很大提高,能够适应实际测试需要,具有广泛的应用性。     

国内高温钛合金板材研究现状

钛合金具有比强度高、密度低、耐蚀性、抗氧化、抗蠕变性能好等特点,已经成为航空航天领域的首选材料。随着高温钛合金板材在航空、航天高温承力结构件等方面的推广应用,国内对高温钛合金板材的关注度也逐步提高。本文简要介绍了国内高温钛合金材料的发展历程,并综述了典型牌号的高温钛合金板材研究现状。     

钼镧合金板材高温抗下垂性能的研究

以粉末冶金法生产的180 mm×20 mm×1.5 mm钼镧合金板材为试验原料,通过对比轧制和高温定型处理制备的钼镧合金板材在1 750℃高温和500 g重物荷载条件的下垂值,并研究了这两种板材的组织形态。结果表明:采用常规工艺轧制的钼镧合金板材组织纤维发达,而采用了高温定型处理后的钼镧合金板材形成了一种粗大、组织相互搭接的再结晶组织;在1 750℃高温及500 g重物的载荷条件下,高温定型后的钼镧合金板材的下垂值较小,其下垂值从常规工艺轧制的钼镧板的4.2 mm减小到1.8 mm,表现出良好的高温抗下垂性能。     

热处理温度对TA7钛合金板材组织与力学性能的影响

研究了TA7钛合金板材热加工态和经750、800、850℃3种不同温度热处理后的显微组织、室温拉伸性能、弯曲性能、高温拉伸性能和高温持久性能。结果表明，热加工态TA7钛合金板材横向存在不均匀组织，纵向有较多拉长α晶粒；经750℃热处理后板材拉长α晶粒转变为等轴状；经800℃热处理后板材横向与纵向均为均匀、细小的等轴组织；经850℃热处理后板材晶粒发生长大。热处理后板材强度降低，塑性增加，弯曲性能和高温持久性能均满足GJB 2505A—2018标准要求；随着热处理温度的升高，板材室温拉伸强度和高温拉伸强度均逐渐降低，经850℃热处理后板材的500℃高温拉伸强度已不能满足要求。为了获得均匀、细小的组织及良好的力学性能，TA7钛合金板材宜采用800℃热处理。     

粉末冶金TZM板材的制造及性能

TZM钼合金板材由于其高温时的高强度及高再结晶温度,使其成为优秀的高温结构材料。本文叙述了用粉末冶金法制取TZM板材的工艺及性能。试样的方向及状态对板材的室温抗拉性能及弯曲塑-脆转变温度的影响也在本文中进行了讨论。另外,对粉冶TZM板材与粉冶纯钼板及熔炼TZM板材的性能进行了比较;还对比了粉冶法及熔炼法生产TZM板材的工艺流程及经益效益。最后简单介绍了有关该板材的使用情况。     

粉末冶金TZM板材的制造及性能

TZM钼合金板材由于其高温时的高强度及高再结晶温度,使其成为优秀的高温结构材料。本文叙述了用粉末冶金法制取TZM板材的工艺及性能。试样的方向及状态对板材的室温抗拉性能及弯曲塑-脆转变温度的影响也在本文中进行了讨论。另外,对粉冶TZM板材与粉冶纯钼板及熔炼TZM板材的性能进行了比较;还对比了粉冶法及熔炼法生产TZM板材的工艺流程及经益效益。最后简单介绍了有关该板材的使用情况。     

郑州轻研成功开发航空航天用铝锂合金超塑性板材

正日前,郑州轻研合金科技有限公司开发的航空航天用铝锂合金超塑性板材成功完成交付,板材宽幅1.2 m、长度4 m、厚度1.5～3 mm。与普通铝锂合金板材相比,该合金板具有晶粒细小、强度高、塑性好的优点,工业化批量生产的板材高温伸长率达到500%,可在高温条件下超塑性制造成形。     

钨含量对Mo-W合金板材组织及力学性能的研究

Mo-W合金因为高熔点、低电阻率及优良的高温性能,在工业高温炉、电子光源和平板显示等诸多领域中已得到广泛应用.研究通过采用粉末冶金及轧制变形的工艺制备出Mo-W合金板材,研究了添加不同钨含量对Mo-W合金板材退火组织形貌演变及高温力学性能的影响.结果表明:轧制变形后的Mo-W合金板材与通过理论计算得到的密度值基本一致,...     

热轧变形量对MGH754合金板材组织和性能的影响

在相同的轧制温度下,通过组织分析和显微硬度分析的方法,研究了热轧工艺中不同的最后一火变形量对MGH754合金热轧态板材组织、退火态板材组织以及板材高温持久强度的影响。研究结果表明:最后一火变形量越高,热轧态板材组织能充分地进行动态再结晶,其晶粒越细小均匀;最后一火变形量越高,更有利于退火中二次再结晶的发生,生成粗大的盘状晶组织;板材的高温持久强度随着最后一火变形量的增大而升高。     

钼镧合金板材高温抗载荷弯曲性能研究

通过轧制和热处理工艺制备出了两种不同组织的钼镧合金板材,研究了该板材在1700oC和1800℃高温条件下的抗载荷弯曲性能。结果表明：采用常规工艺轧制和退火后生产的钼镧合金板材组织细小均匀,采用大变形量加工并提高温度进行完全再结晶退火后生产的钼镧合金板材形成了一种粗大的、燕尾搭接的再结晶组织;在1700—1800℃高温和相同载荷条件下测试时,粗大晶粒的钼镧合金板材具有优异的抗弯曲性能,其最大弯曲值小于常规热轧板材最大弯曲值的20％。     

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.