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J. Cent. South Univ. (2020) 27: 1611-1623 DOI: https://doi.org/10.1007/s11771-020-4394-y New development of powder metallurgy in automotive industry TAN Zhao-qiang(谭兆强)1, 2, ZHANG Qing(张青)2, GUO Xue-yi(郭学益)3, ZHAO Wei-jiang(赵伟江)1, ZHOU Cheng-shang(周承商)1, LIU Yong(刘咏)1 1. State Key Laboratory of Powder Metallurgy, Central South University, Changsha 410083, China; 2. Hoganas (China) Co., Ltd......
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is significantly higher than that of the Fe powder. A content of 0.6% admixed lubricant may be good for the warm compaction of Fe powder but the higher compressibility of the Cu powder will produce compact...Warm compaction powder metallurgy of Cu NGAI Tungwai Leo(倪东惠), WANG Shang-lin(王尚林), LI Yuan-yuan(李元元), ZHOU Zhao-yao(周照耀), CHEN Wei-ping(陈维平) (Guangdong Key Laboratory for Advanced Metallic......
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DOI:10.19476/j.ysxb.1004.0609.2017.06.015 Fe掺杂碳纳米管吸附Al原子的第一性原理研究 代利峰1,刘 涛2,龚 亮1,常春蕊2,安立宝1 (1. 华北理工大学 机械工程学院,唐山 063009； 2. 华北理工大学 理学院,唐山 063009) 摘 要:采用第一性原理对Al原子在本征(5,5)型及Fe掺杂(5,5)型碳纳米管的吸附行为进行研究,研究掺杂Fe前后碳纳米管吸附Al的吸附能,能带结构和电荷分布情况.计算结果表明:掺杂Fe能够增强Al在(5,5)型碳纳米管表面的吸附能,提高Al与碳纳米管之间的电荷转移.这主要是因为掺杂Fe原子后,Fe原子与Al原子之间形成共价键结合,Al与碳纳米管之间由物理吸附转变为化学吸附.此类掺杂有望改善Al基碳纳米管复合材料界面的电接触性能. 关键词:碳纳米管；第一性原理；Fe掺......
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,后期则呈抛物线关系；前期由于氧化时间较短,铁基合金粉末颗粒与氧反应不明显,后期氧与颗粒表面反应,生成Fe,Cr和Ti的氧化物,并形成致密的氧化膜；铁基粉末形成(Fe, Cr)2O3相,随着氧化时间的延长,形成的(Fe, Cr)2O3相衍射峰强度增强. 关键词:铁基粉末；氧化行为；氧化机理 中图分类号:TG 156.98 ...XRD谱分析,暂判定粉末形成新的物相为Ti2O3；粉末氧化8 h时,又有新的衍射峰出现,为铬和铁的氧化物；粉末氧化16 h表层出现铬,铁的氧化物衍射峰强度更高.氧化16 h粉末颗粒最终产生Fe,Cr和Ti的氧化物,随着氧化时间的延长,氧化物相(Fe, Cr)2O3的衍射峰也逐渐增强.这与上述氧含量分析中的结果,随氧化时间的延长氧含量不断增加是相对应的.根据初始粉末元素分析可知,能够参与氧化反应的还有......
properties were investigated, and to explore the wear mechanisms in details. 2 Experimental procedure In this study, Fe matrix materials were fabricated by powder metallurgy technique (P/M). The pre-alloyed Fe-Cr-B powder were prepared by using high temperature sintering technology at 1000 °C. The sintering alloyed powder was milled by using a high energy ball mill, then the pre- alloyed powders were......
extensively studied, due to its high creep strength, irradiation resistance and high temperature stability [4-6]. The alloy was commonly prepared by using mechanically alloyed powder. Firstly, Fe-Cr-W pre... for the engineering application of this steel. The authors thus tried to modify the manufacturing process, by mixing Fe-Cr-W pre-alloyed powder with mechanically alloyed Fe-Cr-W-Ti-Y-O powder. In doing......
金刚石颗粒,使金刚石颗粒的实际温度超过本身的碳化温度,导致金刚石颗粒表面开始出现小面积的碳化,因此,当熔渗时间达到210 min后,复合材料的导热系数反而下降. 图8 Fe基非晶粉质量分数和熔渗时间对复合材料热扩散系数和导热系数的影响 Fig. 8 Effect of Fe based amorphous powder mass fractions((a), (b... on the surface of diamond particles. X-ray diffraction (XRD) was used to analyze the phase of Fe-based amorphous alloy. The characteristic temperature point of Fe-based amorphous powder was measured by DSC......
