燃烧合成陶瓷复合钢管陶瓷层中的铁铝尖晶石

用热力学分析了铁铝尖晶石的成因，并对比了SHS－离心法与SHS－重力法中的铁铝尖晶石形成。热力学分析表明，用铝热剂在大气环境下合成陶瓷复合钢管，铁铝尖晶石相为平衡相。与SHS－离心法相比，SHS－重力法合成的陶瓷复合钢管的陶瓷层中铁铝尖晶石相含量很低，并呈孤立的形式存在于氧化铝相之中。SHS－重力法更有利于FeAl2O4的消除。     

离心SHS陶瓷复合钢管裂纹的控制

总结了近年来在离心SHS陶瓷复合钢管陶瓷层上形成的裂纹类型及其形成机理、陶瓷层裂纹控制方面取得的进展。热应力和钢管的压迫力是离心SHS陶瓷复合钢管陶瓷层产生裂纹的两个主要原因 ,欲减少陶瓷层裂纹的形成 ,除了选用合适的工艺配方 ,关键要在中高温阶段从工艺上严格控制陶瓷复合钢管整体的冷却速率     

基于自蔓延高温合成(SHS)的涂层技术

综述了几种利用自蔓延高温合成(SHS)反应制备涂层的技术,包括反应热喷涂、SHS离心铸造涂层、SHS熔铸涂层以及反应铸渗涂层.介绍了它们的工艺过程、工艺特点、适应的反应体系以及涂层性能.这些基于SHS反应,用于制备耐磨耐蚀陶瓷或金属陶瓷涂层的涂层技术,充分利用SHS技术本身具有的节能、工艺简单、产物纯度高等优点,显示出了很强的竞争优势.     

提高自蔓延高温合成复合管陶瓷层性能的研究

自蔓延高温合成是材料合成新技术，具有工艺简便、能耗低、无污染、效率高等特点，应用该技术制造的复合钢管具有耐磨、耐蚀、隔热等优点，SHS复合管的性能决定于内衬陶瓷层性能。从提高陶瓷层致密度、韧性、表面质量及降低裂纹率等方面，综述了提高SHS复合管内衬陶瓷层性能的措施。     

自蔓延高温合成（SHS）及其应用（一）

本文简要介绍了SHS法的优点、适用范围、研制发展过程及工艺现状。系统地阐述了燃烧理论和过程、燃烧模式及点火技术等,并以氮化物陶瓷、金属间化合物和金属氢化物为例,概述了合成的具体工艺过程。此外还讨论了合成材料的致密方法及SHS过程在焊接和涂层等方面的用途,及现阶段SHS技术所面临的主要问题。     

自蔓延高温合成法制备无钨硬质合金

用SHS同时致密化工艺制备的无钨硬质合金具有优异的性能，可以在很多应用领域中替代传统的WC－Co硬质合金，本文综述了SHS工艺合成无钨硬质合金的种类、性能、工艺条件、应用及发展前景。     

SHS铝热-离心技术的研究进展

介绍了SHS铝热－离心技术的基本原理和铝热反应机制,综述了铝热－离心技术制备陶瓷内衬复合钢管的研究成果和该技术在其它方面的应用情况,提出了复合钢管制备面临的主要问题。     

TiC-TiB2复相陶瓷的自蔓延高温合成研究

以Ti、B和C粉末为原料,采用SHS/PHIP工艺制备了不同组份的TiC-TiB2复相陶瓷,通过试验研究了复相陶瓷的微观结构特征和力学性能.结果表明,SHS反应产物纯净,TiC-TiB2复相陶瓷中只有TiC和TiB2两相存在;随着TiB2含量的增加,复相陶瓷中TiC颗粒尺寸变小,而TiB2颗粒有异常长大现象;TiC-TiB2复相陶瓷的相对密度、硬度和横向断裂强度均随TiB2含量的增加呈先增后减趋势;当TiB2与TiC的重量比为60%时,该复相陶瓷的横向断裂强度和断裂韧度分别为576MPa和5.45MPa·m1/2,而相对密度达到99.4%.     

复合弯管燃烧合成的自动化设备设计与应用

根据铝热－重力分离SHS法制备复合弯管的原理,设计制造了一种燃烧合成复合弯管的自动化生产设备。以89C52单片机为核心智能部件,采用光纤光电传感器进行自动检测,步进电机作为执行电机进行模糊控制,实现了陶瓷内衬复合弯管的工业自动化生产。所制备的复合弯管内衬陶瓷壁厚均匀,组织性能满足要求。     

浇注过程中制备铸造钢基表面自蔓延高温合成TiC/Fe复合材料的研究

通过在消失模铸件模样需耐磨的部位涂敷一层经压实的SHS粉料，使其在浇注过程中，高温浇注的铁水自动点燃SHS粉料，通过反应生成增强陶瓷相(TiC)。并使铁水铸渗到反应后的SHS陶瓷层中，使陶瓷增强相均匀地分散到熔融的表层金属中，从而获得铸件表面自生复合材料层。经试验研究表明，浇注过程中制备铸造钢基表面自蔓延高温合成TiC／Fe复合材料方法是完全可行的，反应合成的TiC颗粒呈理想孤立球状分布在基体上，复合层厚度可控制在3～15mm；其硬度可达HRC54～59；与基体的相对耐磨性可达6以上；经900℃高温退火后，产生大量细小的二次TiC颗粒。其较优工艺条件为：钢液浇注温度1550～1600℃；SHS粉料预制块组成配比(质量分数)为Ti：C：Al：Fe=4：1：1：2；真空度为0．05MPa。     

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.