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Fe含量对粉末冶金Cu-Fe合金显微组织与性能的影响
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作者 张平 袁晓波 +4 位作者 曾梓名 滕剑威 周芸合 杨标标 李云平 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2024年第5期1571-1587,共17页
研究Fe含量对粉末冶金Cu-Fe合金显微组织及性能的影响。采用电火花等离子烧结、冷轧以及时效处理工艺制备4种不同铁含量(5%、10%、20%和40%,质量分数)的Cu-Fe合金。研究结果表明,随着Fe含量从5%(质量分数)增加到40%(质量分数),Fe相由离... 研究Fe含量对粉末冶金Cu-Fe合金显微组织及性能的影响。采用电火花等离子烧结、冷轧以及时效处理工艺制备4种不同铁含量(5%、10%、20%和40%,质量分数)的Cu-Fe合金。研究结果表明,随着Fe含量从5%(质量分数)增加到40%(质量分数),Fe相由离散球形分布演变为连续交错分布,Fe相尺寸从0.29μm增加到1.20μm;时效态的Cu-Fe合金的屈服强度从411.5 MPa提高到788.8 MPa,电导率从62.5%(IACS)降低到42.0%(IACS)。在以上结果的基础上,提出一种混合法则计算Cu基体、初级Fe相和次级Fe相对屈服强度的贡献,可较好地预测Fe含量高于10%(质量分数)合金的力学性能。 展开更多
关键词 铜铁合金 粉末冶金 快速凝固 力学性能 强度计算
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纳米W-Cu复合粉体制备的研究进展
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作者 曹新娜 王喜然 +5 位作者 于华 潘昆明 王长记 张程 王晓东 张学智 《中国材料进展》 CAS CSCD 北大核心 2024年第6期543-557,共15页
W-Cu复合材料结合了W、Cu金属各自优良性能,具有良好的高温强度、延展性、抗电弧烧结性、耐高温氧化和低膨胀系数等特点,广泛应用于机械加工、国防工业、航空航天、电子信息、军事等领域。以超细纳米W-Cu复合粉体为原材料是制备出性能... W-Cu复合材料结合了W、Cu金属各自优良性能,具有良好的高温强度、延展性、抗电弧烧结性、耐高温氧化和低膨胀系数等特点,广泛应用于机械加工、国防工业、航空航天、电子信息、军事等领域。以超细纳米W-Cu复合粉体为原材料是制备出性能优越的W-Cu复合材料的主要途径之一,受到国内外学者的广泛关注。主要总结了W-Cu超细纳米复合粉体的制备方法,如机械合金化法、化学共沉淀法、水热合成-共还原法、喷雾干燥法、溶胶-凝胶法、冷冻-干燥法、燃烧法等,并通过分析现阶段制备W-Cu纳米复合粉体存在的问题,提出了未来该领域的研究方向。 展开更多
关键词 纳米W-cu复合粉体 W-cu复合材料 制备方法 应用领域 发展趋势
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粉末锻造Al_(2)O_(3)颗粒增强Fe–Ni–Mo–C–Cu复合材料的组织与性能
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作者 张旭 史思阳 +5 位作者 张腾雨 田谨 吴亚科 王邃 赵振智 江峰 《粉末冶金技术》 CAS CSCD 北大核心 2024年第3期275-282,共8页
通过粉末锻造技术制备了不同含量微米级Al_(2)O_(3)颗粒强化的Fe–Ni–Mo–C–Cu(Q61)复合材料,并对调质态和淬火态复合材料的组织和性能进行了研究。结果表明:当Al_(2)O_(3)质量分数为0.15%时,增强颗粒在基体内分布均匀;相较于同种状... 通过粉末锻造技术制备了不同含量微米级Al_(2)O_(3)颗粒强化的Fe–Ni–Mo–C–Cu(Q61)复合材料,并对调质态和淬火态复合材料的组织和性能进行了研究。结果表明:当Al_(2)O_(3)质量分数为0.15%时,增强颗粒在基体内分布均匀;相较于同种状态下不添加增强颗粒的单一Q61,调质态复合材料的硬度从HRC 38增至HRC 39.8,屈服强度从1106 MPa增至1121 MPa,延伸率从12%降至6.5%;淬火态复合材料的硬度从HRC 61.5增至HRC 63.2,磨损率从5.27×10^(-6)mm^(3)·m^(-1)·N^(-1)降至3.08×10^(-6)mm^(3)·m^(-1)·N^(-1),低于对比试验用的典型齿轮材料40Cr的磨损率(3.34×10^(-6)mm^(3)·m^(-1)·N^(-1))。当Al_(2)O_(3)质量分数大于0.15%时,Al_(2)O_(3)颗粒逐渐偏聚,虽然调质态下复合材料屈服强度仍继续小幅增加,但塑性严重退化,且淬火态复合材料磨损率增加,耐磨性变差。综合来看,添加0.15%Al_(2)O_(3)颗粒强化Q61复合材料在调质态下具有较高的综合力学性能,而在淬火态下表现出良好的抗摩擦磨损能力。 展开更多
关键词 粉末锻造 Fe–Ni–Mo–C–cu复合材料 微观组织 力学性能 摩擦 磨损
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Cu含量对多孔Ti-5Mn合金微观结构及力学性能的影响
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作者 赵朝勇 伍彩虹 麦萍 《稀有金属与硬质合金》 CAS CSCD 北大核心 2024年第1期57-62,共6页
以质量分数为50%的碳酸氢铵颗粒为造孔剂,使用粉末冶金工艺经真空烧结制备出多孔Ti-5Mn-xCu(x=0,3,5,10)合金,并研究了Cu含量对多孔Ti-5Mn合金微观结构及力学性能的影响。研究结果显示,制备得到的多孔Ti-Mn-Cu合金的孔隙率随着Cu含量的... 以质量分数为50%的碳酸氢铵颗粒为造孔剂,使用粉末冶金工艺经真空烧结制备出多孔Ti-5Mn-xCu(x=0,3,5,10)合金,并研究了Cu含量对多孔Ti-5Mn合金微观结构及力学性能的影响。研究结果显示,制备得到的多孔Ti-Mn-Cu合金的孔隙率随着Cu含量的增加而逐渐降低,其大孔孔径略为减小,大孔壁上微孔数量逐渐减少。多孔Ti-Mn-Cu合金中出现了Ti_(2)Cu相,并且其相对含量随着Cu含量的增加逐渐增多。多孔Ti-Mn-Cu合金的弹性模量和抗压强度均随Cu含量的增加而提高。含3%~10%Cu和5%Mn的多孔Ti-Mn-Cu合金具有合适的孔结构和与人体骨相近的力学性能,具有作为抗菌骨科植入材料的潜力。 展开更多
关键词 多孔钛合金 Ti-Mn-cu 碳酸氢铵 抗菌性 骨修复材料 粉末冶金
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球墨铸铁表面激光熔覆NiCu合金的扫描路径规划
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作者 李艳鹏 李晓华 +1 位作者 武媛 齐影 《机械设计与制造工程》 2024年第8期128-132,共5页
采用同轴送粉激光熔覆技术,在球墨铸铁节点套样件上制备Ni-Cu合金熔覆层对球墨铸铁节点套进行修复。在相同工艺参数的基础上,依据节点套结构特点设计了样件宽度方向A、B对半分区搭接、沿圆周单向熔覆轴向搭接和轴向往返熔覆“弓”字形搭... 采用同轴送粉激光熔覆技术,在球墨铸铁节点套样件上制备Ni-Cu合金熔覆层对球墨铸铁节点套进行修复。在相同工艺参数的基础上,依据节点套结构特点设计了样件宽度方向A、B对半分区搭接、沿圆周单向熔覆轴向搭接和轴向往返熔覆“弓”字形搭接3种不同扫描路径。对3种不同扫描路径下激光熔覆样件的宏观形貌特征、服役界面的渗透探伤无损检测结果及金相组织、显微硬度的对比分析发现,采用沿圆周单向熔覆轴向搭接的方式得到的样件表面熔覆层无缺陷,质量佳。 展开更多
关键词 球墨铸铁 激光熔覆 Ni-cu合金粉 扫描路径 无损检测
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Wood/Cu复合材料的温压成形与表征 被引量:5
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作者 吴庆定 张红 梁盛 《粉末冶金技术》 CAS CSCD 北大核心 2013年第6期408-412,共5页
应用木材科学与技术、粉末冶金等交叉学科材料成形理论开发的木质粉末温压成形新技术,以芦苇秆(简称Wood)粉末为基材,在不添加任何可能造成环境污染的胶粘剂的前提下,制备的Wood/Cu复合材料的静曲强度、内结合强度分别高达85.55MPa、6.7... 应用木材科学与技术、粉末冶金等交叉学科材料成形理论开发的木质粉末温压成形新技术,以芦苇秆(简称Wood)粉末为基材,在不添加任何可能造成环境污染的胶粘剂的前提下,制备的Wood/Cu复合材料的静曲强度、内结合强度分别高达85.55MPa、6.75MPa,磨耗量≤0.05g/100r、吸水率<0.50%,且具有韧性断裂特征;采用Wood/Cu复合材料制备的滑动轴承的压溃强度、表观硬度分别高达100MPa、50HB,可望用于替代粉末冶金烧结青铜生产轻载滑动轴承,从而在节约有色金属的同时,为农林木质剩余物的高质清洁利用开辟一条新途径。 展开更多
关键词 wood cu复合材料 温压成形 滑动轴承 特性表征
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同质异构Al-Cu-Mg系混晶粉末冶金制备新方法 被引量:1
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作者 于涛 李峰 +1 位作者 王野 李学问 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2023年第2期371-382,共12页
为突破传统同质粉末材料均以颗粒尺寸细化作为改性的单一途径禁锢,提出同质异构思想,即通过低能球磨将不同粒径的AA2024合金粉末按照一定比例混合,经热压烧结制备混晶坯料。研究结果表明,传统单一粒径粉末烧结后晶粒形貌趋向于不规则多... 为突破传统同质粉末材料均以颗粒尺寸细化作为改性的单一途径禁锢,提出同质异构思想,即通过低能球磨将不同粒径的AA2024合金粉末按照一定比例混合,经热压烧结制备混晶坯料。研究结果表明,传统单一粒径粉末烧结后晶粒形貌趋向于不规则多边形状,而不同粒径粉末混合烧结后晶粒形貌为小颗粒包覆大颗粒的结构形式;与前者相比,当粗粉占比为20%(质量分数)时,抗拉强度增加了38.8%;当粗粉占比为50%时,伸长率提高了14%。粉末混合后的烧结样品呈沿晶断裂和穿晶断裂的混合断裂机制,第二相对位错的钉扎效应更加明显,因此,合金性能得到显著提高。此研究工作为高性能同质异构混晶材料的制备提供了一种新思路。 展开更多
关键词 同质异构 AL-cu-MG合金 混晶 粉末冶金
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Wood/Cu混合粉末温压成形致密化过程数值模拟 被引量:3
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作者 夏余平 彭博 +1 位作者 董俊辉 吴庆定 《粉末冶金材料科学与工程》 EI 北大核心 2015年第6期852-859,共8页
基于木粉和电解铜粉混合粉末(Wood/Cu粉末)的模压成形试验数据,借助有限元法分析成形压力对Wood/Cu压坯密度的影响,并通过理论计算与试验检测验证相结合的方法对成形压力与压坯密度的关系进行回归分析。结果表明,Shima模型特别适合于Woo... 基于木粉和电解铜粉混合粉末(Wood/Cu粉末)的模压成形试验数据,借助有限元法分析成形压力对Wood/Cu压坯密度的影响,并通过理论计算与试验检测验证相结合的方法对成形压力与压坯密度的关系进行回归分析。结果表明,Shima模型特别适合于Wood/Cu混合粉末常温成形过程的数值模拟,模拟结果与试验结果一致;但在温压成形工艺条件下的模拟结果与试验结果存在明显偏差。通过理论计算、试验检测与分析修正获得的Wood/Cu粉末温压成形"压力-密度"模型由理论方程与修正项组成,对于金属化木质材料及其制品的开发具有实际指导意义。 展开更多
关键词 wood/cu粉末 温压成形 致密化 数值模拟
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多孔Ni-Cu-Ti电极的制备及析氢性能
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作者 吴靓 周子坤 +2 位作者 姬丽 肖逸锋 张乾坤 《材料导报》 CSCD 北大核心 2023年第13期155-163,共9页
通过电解水生产氢气是一种理想的方法,而电极材料的催化活性决定了电解水的效率。该研究通过粉末冶金方法制备了多孔Ni-Cu-Ti电极,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等技术对多孔Ni-Cu-Ti电极的微观结构和物相组成进行表征,并通... 通过电解水生产氢气是一种理想的方法,而电极材料的催化活性决定了电解水的效率。该研究通过粉末冶金方法制备了多孔Ni-Cu-Ti电极,利用扫描电子显微镜(SEM)、X射线衍射(XRD)等技术对多孔Ni-Cu-Ti电极的微观结构和物相组成进行表征,并通过阴极极化、交流阻抗谱和循环伏安测试技术对电极进行了电化学表征。结果表明,在烧结温度为1000℃、质量比为5.5∶3.5∶1时,多孔Ni-Cu-Ti电极表现出最佳的析氢性能,在1 mol/L的KOH中仅需要79 mV(vs.RHE)的过电位就能实现10 mA·cm^(-2)的电流密度,其Tafel斜率为117.07 mV·dec-1。 展开更多
关键词 多孔材料 Ni-cu-Ti合金电极 粉末冶金 析氢反应
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Cu含量对Zn-2.0Mg-xCu合金组织与性能的影响
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作者 于景媛 李强 +1 位作者 赵特 孙旭东 《热加工工艺》 北大核心 2023年第4期37-43,共7页
采用粉末冶金技术制备了Zn-2.0Mg-xCu合金,研究Cu元素对于Zn基合金显微组织、力学性能、耐腐蚀性能和抗菌性能的影响。结果表明:Zn-2.0Mg-xCu合金(x=0.5wt%~2.0wt%)均由η-Zn相和Mg_(2)Zn_(11)相组成,随着Cu含量的增加,Zn-2.0Mg-xCu合... 采用粉末冶金技术制备了Zn-2.0Mg-xCu合金,研究Cu元素对于Zn基合金显微组织、力学性能、耐腐蚀性能和抗菌性能的影响。结果表明:Zn-2.0Mg-xCu合金(x=0.5wt%~2.0wt%)均由η-Zn相和Mg_(2)Zn_(11)相组成,随着Cu含量的增加,Zn-2.0Mg-xCu合金中的孔隙增多,显微硬度和抗压强度均出现先增加而后降低的现象。380℃烧结2 h后Zn-2.0Mg-1.5Cu合金的显微硬度和抗压强度达到最大,为77.3 HV和126.7 MPa。随着合金中Cu含量的增加,Zn-2.0Mg-xCu合金的维钝电流密度、腐蚀速率和失重均增加,人工模拟体液腐蚀浸泡14 d后,Zn-2.0Mg-xCu合金表面逐渐出现明显的腐蚀坑。对Zn-2.0Mg-xCu合金进行的抗菌性研究结果表明:Zn-2.0Mg-xCu合金对金黄色葡萄球菌和大肠杆菌均表现出良好的杀灭和抑制增殖效果,随着Cu含量的增加,Zn-2.0Mg-xCu合金的抗菌效果越明显。 展开更多
关键词 粉末冶金 Zn-Mg-cu合金 力学性能 耐腐蚀性 抗菌性
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Preparation of nanosized W/Cu composite powder by sol-gel technique 被引量:9
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作者 LIBinghu KANGZhanying +1 位作者 CHENWenge DINGBingjun 《Rare Metals》 SCIE EI CAS CSCD 2005年第2期170-173,共4页
Cu(NO3)(2) and (NH4)(6)H(2)W(12)O(40)center dot 4H(2)O were used to prepare W/Cu nanosized composite powder by sol-gel technique. The influences of heat treatment process, pH value of the solution and the amount of an... Cu(NO3)(2) and (NH4)(6)H(2)W(12)O(40)center dot 4H(2)O were used to prepare W/Cu nanosized composite powder by sol-gel technique. The influences of heat treatment process, pH value of the solution and the amount of an addition agent on particle size were investigated by DSC, XRD and TEM. The results show that, at a certain heat treatment temperature, the W/Cu nanoparticle size increases with the pH value or the amount of the addition agent increasing. 展开更多
关键词 COMPOSITE nanosized composite powder SOL-GEL particle size W/cu
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Microstructures of Sintered Mo-Cu Alloys with Mechanically Activated Powder 被引量:7
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作者 Chengchang Jia, Zhong He, Xuekuan Su, Ziqin Yang, Jun Zhao, Zizhang Xie (School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China Beliing Polytechnic University, Beijing 100022, Beijing) 《Rare Metals》 SCIE EI CAS CSCD 2001年第2期112-116,共5页
Mechanical activation and liquid phase sintering were used to manufacture high performance Mo-Cu alloy and develop new processes. The microstructures and properties of the alloy were investigated. The experimental res... Mechanical activation and liquid phase sintering were used to manufacture high performance Mo-Cu alloy and develop new processes. The microstructures and properties of the alloy were investigated. The experimental results showed that: (1) the ball milled Mo/Cu powder has lamellar structure, (2) the microstructures of the sintered Mo-Cu alloy were homogenous compound structures of adhesive phase Cu linking Mo grains, (3) Mo grains frequently strung or gathered in Cu phase, and (4) the full densities of Mo-Cu alloy was achieved through sintering and special densification process. As a result, the properties of the alloy are good enough to satisfy various requirements. 展开更多
关键词 Mo-cu alloy powder metallurgy mechanical activation microstructure
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Spark plasma sintering on mechanically activated W-Cu powders 被引量:7
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作者 JIAChengchang LIZhigang HEYuntao QUXuanhui 《Rare Metals》 SCIE EI CAS CSCD 2004年第3期269-273,共5页
Mechanically activated W-Cu powders were sintered by a spark plasma sinteringsystem (SPS) in order to develop a new process and improve the properties of the alloy. Propertiessuch as density and hardness were measured... Mechanically activated W-Cu powders were sintered by a spark plasma sinteringsystem (SPS) in order to develop a new process and improve the properties of the alloy. Propertiessuch as density and hardness were measured. The microstructures of the sintered W-Cu alloy sampleswere observed by SEM (scanning electron microscope). The results show that spark plasma sinteringcan obviously lower the sintering temperature and increase the density of the alloy. This processcan also improve the hardness of the alloy. SPS is an effective method to obtain W-Cu powders withhigh density and superior physical properties. 展开更多
关键词 powder metallurgy W-cu alloy spark plasma sintering mechanical activation
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Mechanically Driven Alloying and Structural Evolution of Nanocrystalline Fe_(60)Cu_(40) Powder 被引量:1
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作者 Yuanda DONG and Xueming MA(School of Materials Science and Engineering, Shanghai University, Shanghai 200072, China)Yuanzheng YANG(Dept. of Mechanical Engineering(2), South China University of Technology, Guangzhou 510641, China)Fangxin LIU and Genmiao WA 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 1997年第4期354-358,共5页
Highly supersaturated nanocrystalline fcc Fe60Cu40 alloy has been prepared by mechanical alloying of elemental powders. The phase transformation is monitored by X-ray diffraction (XRD),Mossbauer spectroscopy and exten... Highly supersaturated nanocrystalline fcc Fe60Cu40 alloy has been prepared by mechanical alloying of elemental powders. The phase transformation is monitored by X-ray diffraction (XRD),Mossbauer spectroscopy and extended X-ray absorption fine structure (EXAFS). The powder obtained after milling is of single fcc structure with grain size of nanometer order. The Mossbauer spectra of the milled powder can be fitted by two subspectra whose hyperfine magnetic fields are 16 MA/m and 20 MA/m while that of pure Fe disappeared. EXAFS results show that the radial structure function (RSF) of Fe K-edge changed drastically and finally became similar to that of reference Cu K-edge, while that of Cu K-edge nearly keeps unchanged in the process of milling. These imply that bcc Fe really transforms to fcc structure and alloying between Fe and Cu occurs truly on an atomic scale. EXAFS results indicate that iron atoms tend to segregate at the boundaries and Cu atoms are rich in the fcc lattice. Annealing experiments show that the Fe atoms at the interfaces are easy to cluster to α-Fe at a lower temperature, whereas the iron atoms in the lattice will form γ-Fe first at temperature above 350℃, and then transform to bcc Fe 展开更多
关键词 Mechanically Driven Alloying and Structural Evolution of Nanocrystalline Fe MA cu powder Figure
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Microstructure and Properties of W-Cu Alloys Prepared with Mechanically Activated Powder 被引量:5
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作者 Chengchang Jia, Xiuhu Guan, Xuekuan Su, Changheng Hou, Shimin Fan, Jun Zhao, Zizhang Xie (Material Science and Engineering School, University of Science and Technology Beijing, Beijing 100083, China) (Beijing Research Institute of Powder Metallurgy, Beiji 《Journal of University of Science and Technology Beijing》 CSCD 2001年第2期129-132,共4页
W-15% Cu (mass fraction) alloys were sintered with mechanically activated powder in order to develop new preparing processes and improve properties of alloys. The microstructures of the activated powder and the sinter... W-15% Cu (mass fraction) alloys were sintered with mechanically activated powder in order to develop new preparing processes and improve properties of alloys. The microstructures of the activated powder and the sintered alloy were observed. Properties such as density were measured. The results show that through mechanical activation, the particle size of the powder becomes finer to sub-micron or nanometer level, some copper was soluble in tungsten, and high density W-Cu alloys can be obtained by mechanically activated powder for its action to the activation sintering. 展开更多
关键词 powder metallurgy mechanical activation W-cu alloys SINTERING
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添加铁元素对Cu-10Al-4Ni粉末冶金合金组织和性能的影响 被引量:1
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作者 寿德荣 邓正华(指导) 张朝阳 《机械工程材料》 CAS CSCD 北大核心 2023年第8期18-22,共5页
以铜粉、铝粉、镍粉和铜包铁粉为原料,采用粉末冶金工艺制备含不同质量分数(0,1.6%,3.2%,4.8%,6.4%)铁元素的Cu-10Al-4Ni合金,研究了铁含量对合金显微组织和性能的影响。结果表明:未添加铁元素的合金组织由κ_(Ⅲ)相、α相和Al_(4)Cu_(9... 以铜粉、铝粉、镍粉和铜包铁粉为原料,采用粉末冶金工艺制备含不同质量分数(0,1.6%,3.2%,4.8%,6.4%)铁元素的Cu-10Al-4Ni合金,研究了铁含量对合金显微组织和性能的影响。结果表明:未添加铁元素的合金组织由κ_(Ⅲ)相、α相和Al_(4)Cu_(9)相组成;当添加质量分数1.6%的铁元素后,合金中的κⅢ相增多,Al_(4)Cu_(9)相减少;当铁元素质量分数达到3.2%时,Al_(4)Cu_(9)相进一步减少,合金中析出κ_(Ⅰ)相和κ_(Ⅱ)相;随着铁含量继续增加,Al_(4)Cu_(9)相消失,κ_(Ⅰ)相增多,而κ_(Ⅲ)相开始减少。随着铁含量的增加,合金的烧结密度减小,硬度先降低后增加再降低,当铁质量分数达到3.2%时硬度最大;合金的屈服强度随铁含量增加呈波动变化,当铁质量分数达到4.8%时屈服强度最大。 展开更多
关键词 粉末冶金 cu-Al-Ni合金 铜包铁 显微组织 屈服强度
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Effect of closed-couple gas atomization pressure on the performances of Al-20Sn-1Cu powders 被引量:1
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作者 ZHAO Xinming XU Jun ZHU Xuexin ZHANG Shaoming 《Rare Metals》 SCIE EI CAS CSCD 2008年第4期439-443,共5页
Al-20Sn-1Cu powders were prepared by gas atomization in an argon atmosphere with atomizing pressures of 1.1 and 1.6 MPa. The characteristics of the powders are determined by means of dry sieving, scanning electron mic... Al-20Sn-1Cu powders were prepared by gas atomization in an argon atmosphere with atomizing pressures of 1.1 and 1.6 MPa. The characteristics of the powders are determined by means of dry sieving, scanning electron microscopy (SEM), optical microscopy (OM), and X-ray diffractometry (XRD). The results show that the powders exhibit a bimodal size distribution and a higher gas pressure results in a broad size distribution. All particles in both cases are spherical or nearly spherical and satellites form on the surface of coarse particles. Dendritic and cellular structures coexist in the particle. With decreasing particle diameter, the secondary dendrite arm spacing (SDAS) decreases and the cooling rate increases. The particles processed under high gas atomization pressure (1.6 MPa) exhibit a lower SDAS value and a higher cooling rate than those of the same size under low gas atomization pressure (1.1 MPa). The XRD results show that the Sn content increases with decreasing particle size. 展开更多
关键词 powder production Al-Sn-cu alloy gas atomization rapid solidification particle size distribution
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AlN覆钨对AlN/W-Cu复合材料组织和性能的影响 被引量:1
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作者 喻新喜 周锐 +3 位作者 杨光 魏邦争 陈鹏起 程继贵 《中国有色金属学报》 EI CAS CSCD 北大核心 2023年第4期1120-1128,共9页
采用溶胶凝胶法对AlN粉体进行表面覆W后,将其与适量W粉混合,经压制、预烧结,制得多孔AlN/W骨架,再熔渗Cu后制备出不同AlN含量(0~8%)的AlN/W-Cu复合材料。考察了AlN含量对于烧结体微观组织、力学性能和热学性能的影响,并与由未覆钨AlN粉... 采用溶胶凝胶法对AlN粉体进行表面覆W后,将其与适量W粉混合,经压制、预烧结,制得多孔AlN/W骨架,再熔渗Cu后制备出不同AlN含量(0~8%)的AlN/W-Cu复合材料。考察了AlN含量对于烧结体微观组织、力学性能和热学性能的影响,并与由未覆钨AlN粉体制备的AlN/W-Cu复合材料进行对比。结果表明,采用溶胶凝胶法可在AlN颗粒表面均匀制备覆W层,其界面结合良好。覆钨AlN/W-Cu复合材料的相对密度、硬度、抗拉强度以及热导率均优于未覆钨AlN/W-Cu复合材料的。AlN/W-Cu复合材料的相对密度、抗拉强度及热导率随AlN含量的增加而降低,而硬度随AlN含量的增加而上升。当AlN含量为2%时,覆钨AlN/W-Cu复合材料的综合性能最佳,相对密度达到97.69%,显微硬度达到277HV,热导率达到205.54 W/(m·K)。 展开更多
关键词 AlN/W-cu复合材料 覆钨AlN粉体 溶胶凝胶法 熔渗法 热导率
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Microstructural evolution during direct laser sintering of multi-component Cu-based metal powder 被引量:1
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作者 沈以赴 顾冬冬 +2 位作者 吴鹏 杨家林 王洋 《中国有色金属学会会刊:英文版》 EI CSCD 2005年第6期1309-1314,共6页
A multi-component Cu-based metal powder was chosen for direct laser sintering. The powder consists of a mixture of high-purity Cu powder, pre-alloyed CuSn and CuP powder. Liquid phase sintering with complete melting o... A multi-component Cu-based metal powder was chosen for direct laser sintering. The powder consists of a mixture of high-purity Cu powder, pre-alloyed CuSn and CuP powder. Liquid phase sintering with complete melting of the binder (CuSn) but non-melting of the cores of structural metal (Cu) proves to be a feasible mechanism for laser sintering of this powder system. The microstructural evolution of the sintered powder with variation of laser processing parameters was presented. High sintering activities and sound densification response were obtained by optimizing the laser powers and scan speeds. Using a high laser power accompanied by a high scan speed gives rise to balling effect. At a high laser power with a slow scan speed the sintering mechanism may change into complete melting/solidification, which decreases the obtainable sintered density. The role of additive phosphorus in the laser sintering process is addressed. Phosphorus can act as a fluxing agent and has a preferential reaction with oxygen to form phosphatic slag, protecting the Cu particles from oxidation. The phosphatic slag shows a concentration along grain boundaries due to its light mass as well as the short thermal cycle of SLS. 展开更多
关键词 显微结构 铜基金属粉末 激光烧结 液相烧结
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Relationship between powder characteristic and internal oxidation of Al in Cu-Al pre-alloyed powders
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作者 Shuhua LIANG Xianhui WANG +1 位作者 Liang FANG Zhikang FAN 《Acta Metallurgica Sinica(English Letters)》 SCIE EI CAS CSCD 2009年第1期71-80,共10页
Since Cu-Al powder characteristics have important effects on the preparation of Cu/Al2O3 composite, the apparent activation energy of Al internal oxidation reaction in Cu-Al pre-alloyed powders with different characte... Since Cu-Al powder characteristics have important effects on the preparation of Cu/Al2O3 composite, the apparent activation energy of Al internal oxidation reaction in Cu-Al pre-alloyed powders with different characteristics was calculated in the present investigation. The microstructure and properties of the synthesized Cu/Al2O3 were studied. The results show that high-energy milling can obviously promote internal oxidation of Al in Cu-Al powders in the same solid solubility. At the same milling conditions and internal oxidation parameters, the solid solution of Al in Cu either in low or high amount will result in the poor microstructure and properties of the Cu/Al2O3 composite. Subsequently, when high-energy milling and internal oxidation are synchronously used to prepare the Cu/Al2O3 composite, there should be an appropriate solubility and milling effect for the pre-alloyed powders. 展开更多
关键词 powder characteristic Internal oxidation cu/Al2O3 composite material Solid solution Reaction rate
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