镍铬?莫来石复合陶瓷涂层热障及抗热震性能的研究

使用球磨法混制了五组不同比例的镍铬?莫来石复合粉末,利用超音速等离子喷涂技术在45钢基材表面制备相应的镍铬?莫来石复合陶瓷涂层,测定涂层导的热系数和抗热震性能,采用扫描电子显微镜观察涂层表面、截面显微形貌,利用能谱仪分析涂层特征区的组织成分,通过X射线衍射分析涂层组织结构。结果表明,镍铬?莫来石复合涂层以镍铬固溶体为基体,其上均匀分布着莫来石颗粒,莫来石与基体之间形成了扩散相,提高了莫来石与基体之间的润湿性,使莫来石被基体牢固包覆;莫来石颗粒的加入强化了基体,在莫来石体积分数38%～75%范围内,随着莫来石含量的增加,涂层强韧性增加,抗热震性提高,热导率降低。     

钢包用低碳MgO-C砖开发与应用

采用鳞片石墨和特殊石墨不同加入量进行对比,研究了鳞片石墨和特殊石墨对低碳镁碳砖线膨胀、耐侵蚀和抗热震稳定性能的影响,并且应用于实际.结果表明:鳞片石墨和特殊石墨在低碳镁碳砖中并用,合量8%并配以少量添加剂效果最佳.     

热处理气氛对添加Si粉的高铝浇注料预制件性能的影响

在高铝浇注料中分别加入3%、5%、7%和9%的Si粉,制成40 mm×40 mm×160 mm的试样,再分别在氧化气氛、还原气氛和氮化气氛下1 450℃加热,然后检测其常温性能和高温性能,并分析试样的物相组成及显微结构。结果表明:随着Si粉加入量的增加,材料的常温和高温强度提高,抗热震性得到改善,其中还原气氛处理后材料的抗热震性最优,氮气气氛处理后材料的高温强度最高。物相组成及显微结构分析显示:Si加热后分别原位反应生成了莫来石、SiC、Si3N4,对材料起到增强增韧作用。     

氧化镁对氧化铝空心球隔热制品性能的影响

以氧化铝空心球和烧结氧化铝微粉为主要原料,制备氧化铝空心球隔热制品。研究了氧化镁以轻烧氧化镁粉、含镁氧化铝空心球的形式引入对试样抗热震性及其它性能的影响。结果表明:随轻烧氧化镁细粉和富铝尖晶石空心球的引入,材料的抗热震性明显提高,当轻烧氧化镁的加入量为5%,富铝尖晶石空心球加入量为25%时,能够显著提高材料的抗热震性;引入氧化镁的隔热制品,其体积密度和常温耐压强度稍有下降,烧成线变化率变大,荷重软化温度、重烧线变化率相差不大,而热导率降低了23%。     

复吹转炉用镁质透气砖

转炉顶底复合吹炼是近几年迅速发展起来的一项新技术。在复合吹炼中,炉底供气砖是关键部件。我们研制了镁碳质缝隙式和毛细管式供气砖,并于1984年在唐山钢铁公司30吨转炉上连续进行七个炉役试验。结果表明,供气砖材质具有良好的高温性能和抗热震性,结构合理,使用可靠,调节灵便,可以间断供气。每块砖供气量为0～55标准立方米/小时。使用寿命与唐钢30吨转炉炉衬同步,蚀损速度为0.32～0.9毫米/炉。选用纯度较高的电熔镁砂和天然鳞片状石墨为原料,制成镁碳砖,作为炉底透气砖的耐火材料。为提高镀碳砖的抗氧化性能,对成型压力、抗氧化剂的加入量,石墨的粒度和加入量等进行了研究。     

添加ZrO2-SiC复合粉体对Al2 O3 -C质耐火材料抗热震性能的影响

以电熔刚玉、天然石墨以及利用碳热还原法合成的ZrO2-SiC复合粉体为原料制备了Al2O3-C质耐火材料,研究了ZrO2-SiC复合粉体加入量对Al2O3-C质耐火材料抗热震性能的影响.结果表明:添加质量分数为4%的ZrO2-SiC复合粉体试样的显气孔率最低为18.8%;添加6%ZrO2-SiC复合粉体的试样,在1 200 ℃的温度下热震次数达到10次后,其表面并未出现明显裂纹,且其残余耐压强度为16.71 MPa,耐压强度保持率为40.9%,具有良好的抗热震性能.     

不同粒度尖晶石对铝铬刚玉浇注料性能的影响

研究了尖晶石粒度对铝铬刚玉浇注料体积密度、显气孔率、抗折强度、耐压强度、热抗折强度、抗渣和抗热震性的影响。实验表明:(1)尖晶石粒度越细,试样烧后高温强度越高。(2)尖晶石粒度越细,热抗折强度越高。(3)尖晶石粒度越细,抗热震性先增加后降低,加入尖晶石200目,抗热震性能最好。(4)尖晶石粒度越细,抗渣性能增强,100目、200目、325目区别不大。     

蓄热式加热炉用锆刚玉莫来石质蜂窝体的研制与应用

根据蓄热式加热炉的使用条件及蜂窝体的损坏原因,选用锆刚玉、红柱石、莫来石、高岭土等为主要原料,研究了蜂窝体的加热永久线变化率和抗热震稳定性对蜂窝体性能的影响,研制开发的锆刚玉莫来石质蜂窝体具有较低的高温重烧线变化,高温状态下收缩小,避免使用过程中下沉错位,减少了热换气体的短路,同时具有良好的高温体积稳定性,提高了蜂窝体的热震稳定性,增强了蜂窝体的抗氧化铁等粉尘的粘附能力。经过不同炉型的蓄热式加热炉使用,取得了良好的使用效果。     

新型炭素材料对滑板性能的影响

通过对超细石墨、纳米炭黑等滑板用新型炭素材料的实验研究,发现不同粒度的石墨对铝锆碳滑板的热震稳定性影响不同;纳米级炭黑对滑板的成型性能、抗氧化性能、热处理后β-SiC的生成量等都能产生很大的影响。选择超细石墨和粒度为26~30 nm的炭黑按照一定比例添加制成的新型滑板使用效果很好。     

以铁尾矿制备复相材料的实验研究

以工业废弃物铁尾矿为原料,同时配以紫木节、苏州土、烧滑石、氧化铝粉为辅料,采用固相烧结法制备了堇青石-莫来石复相材料。通过测定复相材料的显气孔率、吸水率、线收缩率、抗折强度、抗热震性等性能指标,研究了堇青石与莫来石摩尔比、铁尾矿的含量、烧结温度等因素对复相材料性能的影响,并采用XRD、SEM手段等研究了复相材料的晶相组成和显微结构。研究结果表明:合成的复相材料的最大抗折强度为29.79 MPa,抗热震性达到72次,该试样以堇青石、莫来石晶相为主,另有少量的液相,无其他杂质相。     

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.