共查询到20条相似文献,搜索用时 15 毫秒
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自蔓延高温合成技术及发展 总被引:4,自引:0,他引:4
自蔓延高温合成(SHS)是一项很有希望的制备材料的新技术,与传统工艺相比,自蔓延高温合成具有许多优点。对该合成法的历史发展,应用和理论研究作了简要概括,并全面系统地介绍了SHS的工艺技术,其中包括与传统技术相结合的SHS技术及在SHS基础上的新技术。 相似文献
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放电等离子烧结制备亚微米LaB6块体材料 总被引:1,自引:1,他引:0
采用氢直流电弧等离子体法,以稀土镧块为原料,制备出了平均粒度为20 nm的La纳米粉末.以L丑纳米粉和B纳米粉为原料,采用放电等离子烧结(SPS)技术制备出了LaB6亚微米晶块体材料.通过系统研究各烧结参数对材料结构和性能的影响,得到了最佳的烧结工艺.获得了相对密度高达99.3%的致密烧结体,其维氏硬度达到14.1 GPa.采用XRD,SEM和TEM对材料的相组成和微观组织进行了测试分析.结果表明.SPS烧结LaB6块体的晶粒细小,平均晶粒尺寸为150nm,整体结构均匀致密.实验表明,SPS技术可以实现LaB6细晶块体材料的快速烧结. 相似文献
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Xavier Boulnat Damien Fabregue Michel Perez Marie-Hélène Mathon Yann de Carlan 《Metallurgical and Materials Transactions A》2013,44(6):2461-2465
Oxide-dispersion strengthened (ODS) ferritic steels were produced by mechanical alloying and subsequent spark plasma sintering. Very fast heating rates were used to minimize porosity when controlling grain size and precipitation of dispersoids within a compacted material. Sintering cycles performed at 1373 K (1100 °C) induced heterogeneous, but fine grain size distribution and high density of nano-oxides. Yield strengths at room temperature and at 923 K (650 °C) are 975 MPa and 298 MPa, respectively. Furthermore, high-temperature ductility is much increased: total strain of 28 pct at 923 K (650 °C). 相似文献
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Zakorzhevsky V. V. Loryan V. E. Akopdzhanyan T. G. 《Russian Journal of Non-Ferrous Metals》2020,61(6):675-679
Russian Journal of Non-Ferrous Metals - The results of investigations into the organization of the synthesis of silicon carbide fibers in the gas phase using silicon powder, an energy additive of... 相似文献
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S. Praveen Ameey Anupam Teja Sirasani B. S. Murty Ravi S. Kottada 《Transactions of the Indian Institute of Metals》2013,66(4):369-373
The present study deals with phase evolution of oxide dispersed AlCoCrFe high entropy alloy during mechanical alloying and spark plasma sintering. Mechanical alloying of AlCoCrFe resulted in a single BCC phase. However, ordering of BCC phase with evolution of chromium carbide and sigma phase were observed after spark plasma sintering. High hardness of 1,050 ± 20 HV1 and 1,070 ± 20 HV1 was observed for AlCoCrFe high entropy alloy without and with oxide dispersion, respectively. Significant contribution from solid solution strengthening effect in high entropy alloys appears to have overwhelmed the effect of oxide dispersion on hardness. 相似文献
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放电等离子烧结TbFeCo磁光靶材工艺研究 总被引:2,自引:0,他引:2
研究了采用放电等离子烧结技术制备TbFeCo磁光靶材的工艺过程,考察了烧结温度对材料组织均匀性和致密度的影响。利用扫描电子显微镜和能谱分析仪对材料的微观组织形貌及成分进行了分析,同时用阿基米德法测量了材料的密度。结果表明:适当的提高烧结温度可以使材料得到均匀的组织,理想的致密度。但过高的烧结温度会造成材料局部组织的熔化,使材料的组织均匀性变差,l010℃的烧结温度是制备具有均匀组织和理想致密度Tb(Fe,Co)3材料的最佳温度。 相似文献
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Zakharov G.V. Tavadze G.F. Oniashvili G.Sh. Aslamazashvili Z.G. Chirakadze A.A. Mikaberidze G.V. Kvaskhvadze D.L. Urushadze G.G. 《Powder Metallurgy and Metal Ceramics》2021,60(7-8):513-518
Powder Metallurgy and Metal Ceramics - Ongoing development of manganese ore deposits in various countries and their treatment in special ferroalloys furnaces leads to continued environmental... 相似文献
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氧化锆陶瓷材料的脆性限制了其在某些领域的应用。文章首创在氧化锆粉末中加入316L不锈钢粉,通过放电等离子烧结制备氧化锆基金属陶瓷。试验通过不同的成分配比和不同的烧结温度进行对比研究,采用金相分析、XRD、SEM/EDS等测试方法,对材料的微观结构和宏观性能等进行了表征与分析。并通过断口分析,讨论了Zr O2·316L金属陶瓷的增韧机理。结果表明:采用放电等离子烧结制备出的材料随相组成的成分所占比例的改变,其致密度、弯曲强度、横向断裂强度、断裂韧性都随之呈现出相应的变化规律;316L相以片状均匀分布在氧化锆基体中,在材料断裂时起到了颗粒/纤维增韧的作用。同时氧化锆部分以亚稳相t-Zr O2的形态存在,也起到了相变增韧的作用。 相似文献
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Kolesnichenko V. G. Zamula M. V. Yurchenko Yu. V. Chudinovych O. V. Makogon V. A. Tyschenko N. I. Shyrokov O. V. Sameliuk A. V. Tomila T. V. Kornienko O. A. Ragulya A.V. 《Powder Metallurgy and Metal Ceramics》2019,58(7-8):406-415
Powder Metallurgy and Metal Ceramics - The densification behavior of nanostructured MgF2 ceramics in the spark plasma sintering process is studied. Nitrate synthesis is employed to produce fine... 相似文献
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Metallurgist - This paper presents the results of studying the production of molybdenum-tungsten alloys by spark plasma sintering at various process conditions, as well as the processes of material... 相似文献
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Yuhong Xiong Dongming Liu Ying Li Baolong Zheng Chris Haines Joseph Paras Darold Martin Deepak Kapoor Enrique J. Lavernia Julie M. Schoenung 《Metallurgical and Materials Transactions A》2012,43(1):327-339
Aluminum alloys are widely used because they are lightweight and exhibit high strength. In recent years, spark plasma sintering (SPS) technology has emerged as a viable approach to sinter materials due to its application of rapid heating and high pressure. In this study, SPS was chosen to consolidate dense ultrafine-grained (UFG) bulk samples using cryomilled nanostructured Al 5083 alloy (Al-4.5Mg-0.57Mn-0.25Fe, wt pct) powder. Both bimodal microstructure and banded structure were observed through transmission electron microscopy (TEM) investigation. The evolution of such microstructures can be attributed to the starting powder and the process conditions, which are associated with the thermal, electrical, and pressure fields present during SPS. A finite element method (FEM) was also applied to investigate distributions in temperature, current, and stress between metallic powder particles. The FEM results reveal that the localized heating, deformation, and thermal activation occurring at interparticle regions are associated with the formation of the special microstructure. 相似文献
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Yang Lu Zhao Cancan Zhu Weiwei Cheng Zhuo Wei Pengbo Ren Fuzeng 《Metallurgical and Materials Transactions A》2020,51(6):2796-2810
Metallurgical and Materials Transactions A - The face-centered-cubic (fcc) CoCrFeMnNi high-entropy alloy suffers from low strength and wear resistance at ambient temperature. Herein, we developed a... 相似文献