氮化钛粉末材料的无标X射线定量分析

采用无标X射线定量分析确定氮化钛粉末材料中诸相的含量。对比了理论K值计算法和无标吸收系数法,指出在工艺研究中无论采用那一种方法自洽性好,对于材料的探索具有相对重要的意义。     

碳热还原法制备Ti(C,N)粉末

研究了用淀粉作为碳源还原氢化钛制备碳氮化钛纳米粉的工艺及利用热力学计算分析了反应机理。结果表明 :在实验范围内 ,降低合成温度、缩短保温时间或提高氮气流量有利于形成氮含量高的碳氮化钛粉末。通过控制合成温度和保温时间 ,可以控制Ti(C1 -xNx)中的碳氮比 ,得到不同x值的碳氮化钛粉末。实验结果与理论计算相一致     

原位合成TiN颗粒强化铁基合金粉末

研究了利用氮化工艺在铁合金粉末中原位合成氮化钛颗粒强化相.试验结果表明:氮化温度和热处理制度对合金生成相有重要影响,在1 100～1 250℃氮化后,可在合金粉末中原位生成TiN、CrN、Cr2N等第二相,经1 300℃真空热处理后,CrN和Cr2N相消失,TiN仍稳定存在.合成的TiN颗粒细小,尺寸在1μm左右,并均匀分布在基体粉末中.     

金色陶瓷粉末氮化钛的研究

氮化钛由于其一系列固有特性,近年来越来越受到人们的关注,就其特性、应用及制取作一些简单介绍,并报导了作者采用氢化钛粉末通过脱氢-氮化法制取氮化钛的结果。     

水解沉淀-碳热还原氮化法制备碳氮化钛粉末

以四氯化钛、炭黑为原料,利用水解沉淀-碳热还原氮化法制备了碳氮化钛粉末.利用差热分析、X射线衍射及扫描电镜等表征手段,研究了合成工艺对粉末物相、组成及形貌等的影响.结果发现:前驱体粉末经350 ℃煅烧2h后,钛以TiO2的形式存在,TiO2与炭黑形成了混合均匀的团聚体:在碳热还原氮化反应时,钛氧化物向TiCxNyOz转...     

粉末冶金制粉的新用途:柔性金属贴布涂层技术

“柔性金属贴布”涂层技术 ,是近年来研究开发的一种金属表面特别是形状复杂钢铁工件表面复合涂层新技术。“柔性金属贴布”涂层技术由粉末冶金制粉 ,有机和无机增塑剂、粘结剂、粉末增塑轧制或刮板成形 ,粉末冶金熔渗烧结 ,异质材料连接等技术综合而成。主要工艺为 :先将所需成分的粉末 (包括金属陶瓷 ,碳化钨、碳化钛、氮化钛等粘结金属及铁、铜、钴、镍等粉末 )与有机和无机成形剂、粘结剂、增塑剂制成一面特殊粘附层并像布一样柔软的“金属贴布” ,然后冲裁成所需形状粘贴在金属工件表面 ,然后采用适当的方式加热 ,即可在金属表面形成具…     

碳氮化钛系陶瓷材料

在平均粒径为2μm 以下的碳氮化钛(C 与 N 的摩尔比为1∶9～9∶1中的一种以上)粉末中添加具有相同粒径的碳化铬粉末(Cr_3C_2、Cr_4C、Cr_7C_3等化合物中的一种以上,添加量为混合粉全量的1～90wt%),然后在上述两种粉末组成的基本成分中     

氢化钛直接反应合成氮化钛的研究

氮化钛由于其优异特性，已在工具材料、结构材料及特殊材料中广泛应用。本文概述了用氢化钛粉在一定的低压条件下直接反应合成氮化钛的研究结果并论述了其潜在优势。     

氮化钛低温合成工艺

氮化钛低温合成工艺氮化钛是一种耐高温的材料，是一种高新技术材料，在航空航天工业与其他工业部门有着较广的应用，过去都是通过高温技术生产的，生产成本高。近期日本琦玉大学和琦玉工业大学的科学家研制开发出在低温下合成氮化钛的新工艺。此工艺是将氧化钛和镁粉按３...     

粉末粒度对Ti-35A1多孔材料孔结构的影响

粉末粒度是影响Ti-35Al多孔材料孔结构的主要因素之一.本文采用元素粉末反应合成工艺制备Ti-35Al 多孔材料,在其它制备参数一定的条件下,系统研究Ti/Al元素粉末的粒度与Ti-35Al多孔材料的孔隙度、孔径和透气度等孔结构参数之间的定量关系.结果表明:粉末粒度是决定Ti-A1合金多孔材料最大孔径的主要因素,多孔...     

China's Major Non-ferrous Metals Imports & Exports

正~~     

Zinc Production by Province in 2014

正~~     

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.