自熔合金粉末的研究

介绍了研制用于喷焊的镍基、钴基、铁基、碳化钨弥散型和铜基等 5类16个牌号的自熔合金粉末的化学成分、物理性能及喷焊层的金相显微组织、特性和用途。所研制的镍基合金中 ,铁含量增至 8%～ 15 % ;钴基合金中 ,加入了10 %～ 2 9%的镍和 7%～ 15 %的铁。从而节约大量镍和钴贵重元素 ,并降低合金的生产成本。     

高耐磨Ni65自熔合金粉末

上海钢铁工艺技术研究所研制的高耐磨Ni65自熔合金喷涂粉末,喷焊层硬度达到HRA81.2～84.5(HRC60～66)。具有优良的抗磨性能尤其是抗磨粒磨损性能,还具有良好的耐蚀和抗氧化性能。     

稀土对铁基自熔合金喷焊层组织与耐蚀性能的影响

通过熔炼—雾化工艺制备了稀土铁基自熔合金粉末,并考察了稀土对铁基自熔合金喷焊层的显微组织及其在弱酸、中性盐溶液中耐蚀性能的影响。采用金相显微镜、SEM、EDAX对合金喷焊层的物相结构、显微组织进行了观察和分析。在实验结果的基础上,对稀土的有关作用机制进行了分析和讨论。     

层流冷却辊喷焊制造技术

依据层流冷却辊的使用工况,选择了自行研制的YJ Ni60A的自熔合金粉末作为材料对热轧输送辊道辊进行了喷焊试验,对喷焊层的化学成分、硬度分布、相结构与组织结构进行了分析与测试,并通过上机实际应用达到同等进口材料的水平.     

稀土铁基自熔基合金抗硫化氢腐蚀性能的实验研究

近年来关于稀土在热喷涂（焊）材料中的应用研究正日益受到人们的重视。铁基自熔合金末作为一种广泛使用的热喷涂（焊）材料具有价格低廉，喷涂（焊）层的耐磨性较好等优点，但其耐蚀性较差。为此，本研究引入稀土对其改性。通过熔炼－雾化工艺制备了稀土铁基自熔合金粉末，并考察了稀土对铁基自熔合金喷焊层在硫化氢介质中气蚀和在含硫化氢的中性氯化钠溶液中浸蚀的影响。结果表明，铁基自熔合金（含稀土和不含稀土）喷焊层试样表现出较强的抗硫化氢能力。铁基合金喷焊层试样在含硫化氢的4Wt%NaCl溶液中的腐蚀速率随稀土的添加量增加量增加而逐渐降低，且稀土添加量有最佳值0.2Wt%。     

Ni基Cr_3C_2、WC增强等离子堆焊焊层的耐磨性能

以粒径53~150μm的WC、Cr_3C_2(Cr_3C_2质量分数为10%~40%)和NiCrBSi粉末为原料,采用Stellite等离子转移弧(PTA)堆焊系统在45#钢基体上制备焊层。应用金相显微镜、X-射线衍射仪、扫描电镜、硬度计等设备分析焊层的结构和性能。结果表明:Ni Cr BSi自熔合金焊层组织由γ-(Ni,Fe)和其间弥散分布的CrB和(Cr,Fe,Ni)_7C_3相组成;Cr_3C_2加入后,焊层中出现Cr_3C_2衍射峰。随Cr_3C_2含量增加,焊层硬度、孔隙率和耐磨性逐渐提高,Cr_3C_2含量为30%时,硬度和耐磨性均达到峰值。铸造WC加入后,以WC、W_2C为主,并有少量(Cr,Fe,Ni)_7C_3和(Ni,Cr,W)3C产生。Cr_3C_2含量为40%的Cr_3C_2焊层较Ni50A焊层耐磨性提高197.6%,比加入相同含量铸造WC焊层耐磨性提高97.6%。Cr_3C_2、铸造WC加入后,焊层的磨损机理不同:Cr_3C_2/Ni属于均匀磨损,WC/Ni属于非均匀磨损。     

钒对喷熔材料性能的影响

为提高镍基和铁基合金粉喷熔层的耐磨性和耐热疲劳性能,在现有的Fe60E和Ni60A喷熔合金粉中加入1.5%～1.8%的V制成新型喷熔材料Fe60EV和Ni60AV.试验测定了Fe60EV和Ni60AV喷熔层的硬度、耐磨性和抗热疲劳性能,结果表明,含钒喷熔合金层的硬度比未加钒的喷熔合金层的高,其耐磨性和耐热疲劳性能也明显提高.在热轧卷取机衬板上的工业应用表明,喷熔Fe60EV和Ni60AV合金层后,其使用寿命分别比喷熔Fe60E和Ni60A提高30%以上.     

不同共晶组织含量铸造碳化钨焊层的微观结构和耐磨性能研究

以不同共晶组织含量的铸造碳化钨和镍基自熔合金混合粉末为原料,采用等离子转移弧(PTA)堆焊制备各焊层;通过金相显微镜和扫描电镜、G65磨粒磨损测试等研究了各焊层的微观结构和耐磨性能。研究结果表明:采用高共晶组织的铸造碳化钨能改善焊层微观结构,获得硬质相分布均匀、无孔洞、高硬度等特点的焊层;同时能显著提高焊层的耐磨性能。     

稀土对铁基自熔合金自熔性的影响

制备了含稀土的铁基自熔合金并考察了这种自熔合金在氧－乙炔火焰喷焊过程中的自熔性。结果表明，适量的稀土可以非常显著地改善铁基自熔合金的自熔性。这可归因于稀土可降低铁基自熔合金中表面活性元素氧和硫的含量，从而改善了喷焊过程中合金熔滴间的相互润湿，加速了其向喷焊层融合，减少了合金熔滴表面生成氧化膜的可能性。     

WC-镍基自熔合金组合粉的研究与应用

研究了WC-镍基自熔合金组合粉的组成、制造工艺及各项性能。该类组合粉适合于氧乙炔焰及等离子喷焊法施工,喷焊工艺性能良好,其喷焊层具有优异的耐磨性和耐蚀性。指出喷焊层耐磨料磨损性受WC颗粒间距影响。     

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.