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W-Cu面对等离子体梯度热沉材料的制备和性能

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复合材料学报 2008年第2期25卷 25-30页

作者：汪峰涛吴玉程王涂根陈俊凌合肥工业大学材料科学与工程学院合肥230009 中国科学院等离子体物理研究所合肥230031

采用粉末冶金法制备了W-Cu面对等离子体梯度热沉材料。对其显微组织、界面以及重要的热学、力学性能进行了研究。显微组织观察表明:截面成分呈梯度分布,并通过高温下元素的扩散,实现了组织的连续变化,层间没有明显界面;烧结后Cu形成了... 详细信息

采用粉末冶金法制备了W-Cu面对等离子体梯度热沉材料。对其显微组织、界面以及重要的热学、力学性能进行了研究。显微组织观察表明:截面成分呈梯度分布,并通过高温下元素的扩散,实现了组织的连续变化,层间没有明显界面;烧结后Cu形成了连续的网络结构,分布在W颗粒周围。W-Cu梯度材料的化学元素分布和热学、力学性能沿厚度方向呈梯度变化,材料整体的热导率达151.4 W.(m.K)-1。在800℃温差条件下,对材料分别进行抗热震和耐热疲劳实验。热震实验后,界面处未发现裂纹和开裂现象,表现出良好的抗热震性能。经过83次热循环冲击后,观察到了裂缝,并探讨了裂缝形成机制。

关键词：面对等离子体热沉材料 W-Cu梯度材料粉末冶金热循环

机械合金化对W-20Cu复合材料的显微组织与性能的影响

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材料热处理学报 2007年第B8期28卷 67-70页

作者：汪峰涛吴玉程王涂根任榕合肥工业大学材料科学与工程学院安徽合肥230009

采用机械合金化结合粉末冶金技术制备W-20Cu(vol%)复合材料。利用扫描电镜和金相显微镜对不同球磨时间的W-20Cu复合材料显微组织进行表征,并对材料的各项物理性能进行测试。结果表明,随着球磨时间的延长,W-20Cu烧结体的组织越来越均匀,C... 详细信息

采用机械合金化结合粉末冶金技术制备W-20Cu(vol%)复合材料。利用扫描电镜和金相显微镜对不同球磨时间的W-20Cu复合材料显微组织进行表征,并对材料的各项物理性能进行测试。结果表明,随着球磨时间的延长,W-20Cu烧结体的组织越来越均匀,Cu相分布也越来越均匀。W-20Cu烧结体密度、收缩率、硬度、抗弯强度随球磨时间的延长而增大;球磨20h的W-20Cu复合粉烧结体热导率达到峰值(130.61 Wm^(-1)K^(-1)),继续球磨,热导率减小。综合考虑所有研究结果,通过机械合金化所制备的W-Cu复合粉体可以获得具有优异综合物理性能的W-20Cu复合材料。

关键词： W-Cu 复合材料机械合金化显微结构物理性能

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粉末冶金法制备纳米颗粒增强Cu基复合材料

材料热处理学报 2007年第5期28卷 10-14页

作者：汪峰涛吴玉程王涂根王文芳合肥工业大学材料学院安徽合肥230009

采用粉末冶金方法,以SiC、SiO2、Al2O3和AlN等纳米颗粒为增强相,制备出Cu/SiC、Cu/SiO2、Cu/Al2O3和Cu/AlN等铜基纳米复合材料;研究了各增强相的含量对复合材料的显微组织和性能的影响,比较了不同纳米颗粒对铜基复合材料的增强效果。结... 详细信息

采用粉末冶金方法,以SiC、SiO2、Al2O3和AlN等纳米颗粒为增强相,制备出Cu/SiC、Cu/SiO2、Cu/Al2O3和Cu/AlN等铜基纳米复合材料;研究了各增强相的含量对复合材料的显微组织和性能的影响,比较了不同纳米颗粒对铜基复合材料的增强效果。结果表明,Cu基纳米复合材料随增强相质量分数的增加,密度降低,电阻率略有升高,强度和硬度先升高后降低;退火温度曲线表明,复合材料的软化温度都达到700℃以上,远高于纯铜的软化温度(150℃),大大提高了材料的热稳定性;通过比较得知,在质量分数相同时,所采用的各增强相纳米颗粒对铜基体的增强效果相近。

关键词：粉末冶金密度电阻率硬度软化温度

AlN和Al_2O_3纳米颗粒增强铜基复合材料

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合肥工业大学学报（自然科学版） 2005年第9期28卷 1031-1034,1125页

作者：吴玉程王涂根合肥工业大学材料与科学工程学院安徽合肥230009

用粉末冶金法制备了Cu/AlN和Cu/Al2O3两种复合材料,研究了两种纳米颗粒含量对复合材料性能的影响和复合材料的软化温度,并探讨了相关机理,比较了AlN和Al2O3纳米颗粒的增强效果。结果表明,在烧结过程中,弥散分布在铜基体中的AlN和Al2O3... 详细信息

用粉末冶金法制备了Cu/AlN和Cu/Al2O3两种复合材料,研究了两种纳米颗粒含量对复合材料性能的影响和复合材料的软化温度,并探讨了相关机理,比较了AlN和Al2O3纳米颗粒的增强效果。结果表明,在烧结过程中,弥散分布在铜基体中的AlN和Al2O3纳米颗粒细化了晶粒;随着复合材料中AlN和Al2O3质量分数的增加,材料的密度和导电性都呈下降趋势,而硬度出现极大值;两种复合材料的软化温度均达到700℃,远远高于纯铜的软化温度(150℃),从而提高了材料的热稳定性;综合各种因素考虑,AlN纳米颗粒对铜基体的增强效果要优于Al2O3纳米颗粒。

关键词：粉末冶金复合材料纳米颗粒导电性硬度软化温度

Synthesis and grain growth kinetics of in-situ FeAl matrix nanocomposites(Ⅰ):Mechanical alloying of Fe-Al-Ti-B composite powder

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中国有色金属学会会刊：英文版 2007年第5期17卷 919-924页

作者：任榕吴玉程汤文明汪峰涛王涂根郑治祥 School of Materials Science and Engineering Hefei University of Technology

Three nanocrystalline alloys, Fe50Al50, Fe42.5Al42.5Ti5B10 and Fe35Al35Ti10B20 (molar fraction, %), were synthesized from elemental powders by high-energy ball milling. The structural evolutions and morphological changes of the milled powders were characterized by X-ray diffractometry(XRD), transmission electron microscopy(TEM) and scanning electron microscopy(SEM). The effects of different Ti, B additions on the structure and phase transformation in these alloys were also discussed. It is observed that the diffusion of Al, Ti, B atoms into Fe lattice occurs during milling, leading to the formation of a BCC phase identified as Fe(Al) or Fe(Al, Ti, B) supersaturated solid solution. Fe-based solid solution with nanocrystalline structure is observed to be present as the only phase in all the alloy compositions after milling. Furthermore, the contents of Ti, B affect the formation of mechanical alloying products, changes in the lattice parameter as well as the grain size.

关键词： FeAl复合材料机械力学合金结构进化

Synthesis and grain growth kinetics of in-situ FeAl matrix nanocomposites(Ⅱ):Structural evolution and grain growth kinetics of mechanically alloyed Fe-Al-Ti-B composite powder during heat treatment

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中国有色金属学会会刊：英文版 2008年第1期18卷 66-71页

作者：任榕吴玉程汤文明汪峰涛王涂根郑治祥 School of Materials Science and Engineering Hefei University of Technology

Morphological changes,structural evolutions and grain growth kinetics of mechanically alloyed(MAed)Fe50Al50,Fe42.5Al42.5Ti5B10 and Fe35Al35Ti10B20(mole fraction,%)powders were investigated by XRD and SEM,when being isothermally annealed at 1 073-1 373 *** effect of different Ti and B addition on the grain growth of FeAl phase was also *** results show that the nanocrystalline FeAl and in-situ TiB2/FeAl nanocomposite powders can be synthesized by subsequent heat *** the relaxation of crystal defects and lattice stress,the transformation from Fe-based solid solution into B2-FeAl and TiB2 occurs upon heating of the MA-processed *** the grain growth takes place,the grain sizes of both FeAl and TiB2 are still in nanometer *** activation energies for the nanocrystalline FeAl growth in the three alloys are calculated to be 534.9,525.6 and 1 069.6 kJ/mol respectively,according to kinetics theory of nanocrystalline *** with different TiB2 contents exhibit unequal thermal *** presence of higher content TiB2 plays significant role in the impediment of grain growth.

关键词：结构进化热处理晶体动力学金属学

Microstructure and properties of copper matrix composites reinforced by nano-SiC and nano-Al_2O_3 particles

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中国有色金属学会会刊：英文版 2005年第S3期15卷 136-139页

作者：汪峰涛吴玉程任榕王涂根王文芳 School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China

Copper/silicon carbide composites （Cu/SiC） and copper/alumina composites （Cu/Al2O3） were fabricated by the powder metallurgy method. The influence of reinforcement particles contents on the relevant properties of the composites and the microstructure of Cu/SiC and Cu/Al2O3 composites were studied. The reinforcement effects of nano-SiC and nano-Al2O3 particles were compared. The experimental results show that with the increase of the amount of nano-SiC and nano-Al2O3 particles, the density of the both composites decreases, the resistivity increases, whereas the hardness increases firstly and then drops. The softening temperatures of the composites are above 700℃ which is far higher than that of the pure copper, leading to the improvement of the thermal stability of the composites at high temperatures. Considering all factors, the reinforcement effects of nano-SiC are better than those of nano-Al2O3 when their contents are the same in the copper matrix.

关键词： thermal stability density copper matrix composite resistivity hardness softening temperature

Copper matrix composites reinforced respectively with nano-SiO_2 and nano-AlN particles

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中国有色金属学会会刊：英文版 2005年第S3期15卷 132-135页

作者：吴玉程王涂根汪峰涛任榕王文芳 School of Materials Science and Engineering Hefei University of Technology Hefei 230009 China

Two kinds of copper matrix composites reinforced respectively with nano-SiO2 and nano-AlN were prepared by powder metallurgy technique. The microstructure and properties of the composites were studied. The results show that the nano-SiO2 and nano-AlN distribution are uniform and the particulates also refine the grains. With the increase of nano-SiO2 and nano-AlN addition, the density of the both composites decreases, the resistivity increases, whereas the value of hardness reaches the maximum. Softening temperature of the two kinds of composites are above 700℃ which is very high in comparison with pure copper（about 400℃）. But with the same content of nano-SiO2 and nano-AlN particles, the hardness of Cu/AlN is much higher than that of Cu/SiO2, and the resistivity of Cu/AlN is close to that of Cu/SiO2. Thus the reinforcement effect of nano-AlN is better than that of nano-SiO2.

关键词： powder metallurgy composite nano-particle resistivity hardness softening temperature

纳米AlN颗粒增强铜基复合材料的组织与性能研究

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粉末冶金工业 2005年第4期15卷 21-24页

作者：王涂根吴玉程王文芳张建华合肥工业大学材料学院合肥230009

用粉末冶金法制备了AlN增强的Cu/AlN复合材料,研究了AlN含量对复合材料性能的影响和Cu/AlN复合材料的软化温度特性。结果表明,在烧结过程中,弥散分布在铜基体中的纳米AlN颗粒对致密化以及晶粒长大都有阻碍作用。随着复合材料中AlN颗粒... 详细信息

用粉末冶金法制备了AlN增强的Cu/AlN复合材料,研究了AlN含量对复合材料性能的影响和Cu/AlN复合材料的软化温度特性。结果表明,在烧结过程中,弥散分布在铜基体中的纳米AlN颗粒对致密化以及晶粒长大都有阻碍作用。随着复合材料中AlN颗粒质量分数的增加,材料的密度和导电性呈下降趋势,而硬度出现极大值。复合材料的软化温度达到700℃,远远高于纯铜的软化温度(150℃),从而提高了材料的热稳定性。

关键词：粉末冶金 Cu/AlN 复合材料导电性硬度软化温度