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TiC-TiB2/MoSi2复合材料的制备及力学性能 总被引:3,自引:0,他引:3
以MoSi2、Ti和B4C粉为原料,采用高温热压技术原位合成不同体积百分数TiC-TiB2强韧化MoSi2复合材料,研究了TiC-TiB2颗粒对MoSi2基体材料显微组织结构和力学性能的影响.实验结果表明,采用MoSi2、Ti和B4C粉为原料进行热压原位合成是可行的.30%TIC-TiB2/MoSi2复合材料的抗弯强度和维氏硬度分别达到468.3 MPa和17 070,与纯MoSi2比较,分别增加了63.2%和83.5%.随着TiC-TiB2体积分数的增加,TiC-TiB2/MoSi2复合材料的晶粒大小明显细化,断裂方式由沿晶断裂为主向穿晶断裂为主转变,强化机制是细晶强化和弥散强化. 相似文献
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通过热压烧结工艺制得了(SiCp+C)/MoSi2复合材料,测试分析了材料的组织结构、室温和高温力学性能.结果表明:(SiCp+C)/MoSi2复合材料主要由MoSi2(大量),α-SiCp(大量),Mo5 Si3(多量)和β-SiC(少量)组成,密度为5.12g/cm3,相对密度为91%;增强相的粒径<30μm,体积分数为39%.其室温硬度、抗弯强度和断裂韧性分别为12.2 GPa,530MPa和7.2MPa·m1/2;材料在800℃的维氏硬度为8.0 GPa,1 200和1400℃的抗压强度分别为560MPa和160MPa.与非增强MoSi2相比,材料的各种力学性能都有大幅度的提高. 相似文献
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Mo-Si经烧结转变为MoSi2-SiC的过程 总被引:1,自引:1,他引:0
在C/SiC复合材料表面刷涂Mo-Si浆料,在1430℃真空烧结.借助DSC分析研究Mo-Si反应的动力学过程,通过XRD和SEM研究烧结产物的结构和形貌,并深入分析SiC的形成过程.结果表明:温度低于Si熔点时,Mo-Si反应以Si的扩散为控制步骤,反应速率缓慢,生成产物依次为Mo3Si和Mo5Si3等中间相,而在Si熔点附近迅速转变为MoSi2;刷涂试样烧结后均生成多孔MoSi2-SiC,其内层为网络状结构MoSi2-SiC,表层为SiC生长锥和晶须;随Si含量增加,MoSi2-SiC层致密度增加,SiC择优取向由(222)向(111)转变. 相似文献
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利用热重量分析法(简称TGA法)、X-射线衍射(X-Ray)、SEM和氧化动力学分析等手段研究了原位反应高温热压一次复合工艺所制不同百分含量原位SiC颗粒增强的SiCP/MoSi2在800~1 200 ℃的抗氧化性能.结果表明,SiCP/MoSi2复合材料的抗氧化性能强于纯MoSi2材料;适量原位SiC颗粒的生成可以提高SiCP/MoSi2复合材料的抗氧化性能;材料氧化反应生成的SiO2层的致密性影响其氧化活化能及抗氧化性能,SiO2层越致密,氧化活化能越高, 抗氧化性能越好. 相似文献
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采用真空热压法制备不同MoS2含量的Cu/Cu-MoS2功能复合材料,测定其密度、硬度和电导率,并用MMU-5GA微机控制真空高温摩擦磨损试验机测试其摩擦磨损性能,通过扫描电镜对试样显微组织及磨损形貌进行观察,并进行能谱分析。结果表明:通过真空热压法制备的功能复合材料组织均匀、过渡层明显,Cu层与耐磨层的过渡平稳,界面结合强度较高;烧结过程中,Cu与部分MoS2发生反应,烧结产物主要为复杂的CuS-Mo化合物及单质Mo;随着MoS2含量的增加,材料的电导率和密度下降,硬度及耐磨性提高;单质Mo及MoS2对材料的耐磨性影响较大,当耐磨层含3%质量分数的MoS2时,功能复合材料的电导率与耐磨性有较好的配合。 相似文献
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<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 相似文献
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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, 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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 相似文献
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《China Nonferrous Metals Monthly》2014,(10)
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, 相似文献
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《China Nonferrous Metals Monthly》2014,(12)
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. 相似文献
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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. 相似文献
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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. 相似文献