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球形Al-25W合金燃料粉末的氧化行为与能量性能 被引量:1
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作者 胡敖博 蔡水洲 邹辉 《含能材料》 EI CAS CSCD 北大核心 2023年第8期743-752,共10页
为了获得热氧化与能量释放性能优异的新型合金燃料,采用铝热还原与超高温气雾化结合的方法,制备了球形铝钨合金燃料粉末(Al-25W),对其物相结构、氧化行为及能量性能进行了研究。结果表明,球形Al-25W合金粉末颗粒内部的亚稳态Al/W合金相... 为了获得热氧化与能量释放性能优异的新型合金燃料,采用铝热还原与超高温气雾化结合的方法,制备了球形铝钨合金燃料粉末(Al-25W),对其物相结构、氧化行为及能量性能进行了研究。结果表明,球形Al-25W合金粉末颗粒内部的亚稳态Al/W合金相均匀分布在单质Al基体中,且通过稳定化处理后亚稳态Al/W合金相转变为Al12W相,并对外释放能量。球形Al-25W合金粉末具有比单质Al粉更高的氧化放热量与氧化增重,能在1400℃空气中完全氧化,且W原子全部氧化为WO3并以气态形式挥发,残留氧化产物仅为Al2O3。球形Al-25W合金粉末的实测体积燃烧焓超过单质Al粉的理论体积燃烧焓(83000 J·cm^(-3)),可达(83132.1±608.5)J·cm^(-3),且剧烈燃烧时生成气态燃烧产物WO3。 展开更多
关键词 Al-25w合金粉末 铝热还原 超高温气雾化 Al/w合金 氧化行为 能量性能
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Manufacture of μ-PIM gear mold by electroforming of Fe-Ni and Fe-Ni W alloys 被引量:2
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作者 Seong Ho SON Sung Cheol PARK +1 位作者 Wonsik LEE Hong-Kee LEE 《Transactions of Nonferrous Metals Society of China》 SCIE EI CAS CSCD 2013年第2期366-371,共6页
The micro gear mold for powder injection molding was made by electroforming process of Fe-Ni and Fe-Ni-W alloys using UV-lithography process. Kinetics and activation energies in electroplating of both alloys were inve... The micro gear mold for powder injection molding was made by electroforming process of Fe-Ni and Fe-Ni-W alloys using UV-lithography process. Kinetics and activation energies in electroplating of both alloys were investigated to determine the best process conditions. Fe content within electrodeposited Fe-Ni alloys increased with the increase of rotating disk speed and the decrease of temperature and it is considered from the calculated activation energy of iron content that the rate determining step is controlled by mass transfer. Iron content in Fe-Ni electrodeposit varied from 58.33% to 70.45% by increasing current density from 2 to 6 A/drn2. Also, iron content in Fe-Ni-W electrodeposit increased from 59.32% to 70.15%, nickel content decreased from 27.86% to 17.07% and the content of tungsten was almost consistent in the range of 12.78%-12.82% although the current density increases from 1.5 to 5 A/dm^2. For the electroforming of micro gear mold, SU-8 mandrel with 550 μm in diameter and 400 μm in height was prepared by UV-lithography processing. Subsequently, Fe-36Ni and Fe-20Ni-13W alloys micro gear molds were electroformed successfully. Surface hardness values of the electroformed micro molds were measured to be HV490 and HV645, respectively. 展开更多
关键词 ELECTROFORMING Fe-Ni alloy Fe-Ni-w alloy gear mold PIM
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Phase transformation of nano-grained W(Co, C) composite powder and its phase constitute 被引量:1
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作者 曹顺华 蔡志勇 +2 位作者 周建华 李炯义 林信平 《Journal of Central South University of Technology》 EI 2006年第6期603-607,共5页
A new process of WC-Co cemented carbide was developed by using nano-grained W(Co, C) composite powders as raw materials processed by high-energy ball milling. X-ray diffraetion(XRD), differential thermal analysis ... A new process of WC-Co cemented carbide was developed by using nano-grained W(Co, C) composite powders as raw materials processed by high-energy ball milling. X-ray diffraetion(XRD), differential thermal analysis (DTA), thermo-gravimetrie (TG) analysis and coercive forces of the sintered samples were adopted to analyze the phase transformation and constitution, and the microstructures of sintered samples were characterized by scanning electron microscopy(SEM). The results show that the as-milled powders are transformed into transitional phases W2C and η (Co3W3C or Co6W6C) during sintering, and finally transformed into WC and Co phases completely at 1 250℃ for 30 min, and a large number of fibrous WC grains with about 1.2μm in length and 100 nm in radial dimension are formed in the sintered body at 1 300 ℃. 展开更多
关键词 cemented carbide phase transformation high-energy ball milling fibrous wC grain
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齿科用Co25Cr5W5Mo合金粉末制备及激光选区熔化成形打印件性能分析 被引量:7
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作者 兰剑 刘立科 +3 位作者 王庆相 张若冰 左振博 梁书锦 《粉末冶金工业》 CAS 北大核心 2021年第6期13-18,共6页
本研究采用超高速等离子旋转电极雾化(SS-PREP)方法制备出用于激光选区熔化成形(SLM)的15~53μm球形金属粉末,流动性为12.1 s/50g,松装密度为5.0 g/cm^(3),振实密度为5.31 g/cm^(3)。采用激光功率160 W、扫描速度1200 mm/s、打印间距0.0... 本研究采用超高速等离子旋转电极雾化(SS-PREP)方法制备出用于激光选区熔化成形(SLM)的15~53μm球形金属粉末,流动性为12.1 s/50g,松装密度为5.0 g/cm^(3),振实密度为5.31 g/cm^(3)。采用激光功率160 W、扫描速度1200 mm/s、打印间距0.07 mm、光斑直径0.06 mm和铺粉层厚0.03 mm的打印参数进行打印,并在热处理后对其力学性能、金瓷结合强度、翘曲变形、遗传毒性、细胞毒性和迟发型超敏反应等进行了研究分析和测试,结果表明:采用"超高速等离子旋转电极雾化+激光选区熔化成形+热处理(SS-PREP+SLM+HT)"的工艺路线制备的打印件可满足齿科材料的性能要求和临床使用要求。 展开更多
关键词 Co25Cr5w5Mo合金粉末 齿科 激光选区熔化成形 超高速等离子旋转电极雾化
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水热法制备ZrO_(2)掺杂钨粉体过程中的粉体形貌与相转变 被引量:1
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作者 叶家豪 赵云超 +2 位作者 李洲 朱晨辉 徐流杰 《稀有金属》 EI CAS CSCD 北大核心 2023年第6期825-833,共9页
为了探究掺杂不同含量、不同晶型ZrO_(2)是否对W合金粉体微观形貌产生影响及相转变,通过水热合成、煅烧、两段氢还原工艺制备了不同含量及不同晶型的ZrO_(2)掺杂W合金粉体,研究了ZrO_(2)对W合金粉体微观形貌、尺寸的影响。结果表明:水... 为了探究掺杂不同含量、不同晶型ZrO_(2)是否对W合金粉体微观形貌产生影响及相转变,通过水热合成、煅烧、两段氢还原工艺制备了不同含量及不同晶型的ZrO_(2)掺杂W合金粉体,研究了ZrO_(2)对W合金粉体微观形貌、尺寸的影响。结果表明:水热合成的ZrO_(2)掺杂含量W合金粉体前驱粉由仲钨酸铵(APT)和ZrO_(2)两相构成,粉体团聚现象比较严重,粉体颗粒主要呈片状或块状,粒径较分散。煅烧后粉体由WO_(3)和ZrO_(2)两相构成,颗粒细小而分散。经二段氢还原后,粉体转变成W和ZrO_(2)两相,粉体颗粒大部分呈近球形,分散均匀。与稀土氧化物细化粉体颗粒作用机制较类似,ZrO_(2)的存在从促进形核、抑制生长两方面影响W颗粒长大的化学气相沉积反应而细化粉体颗粒,且掺杂量越大粉体越细小。纯W粒径约为15.329μm,掺杂ZrO_(2)可使粉体粒径减小到3.552μm左右。同样掺杂量的条件下,ZrO_(2)晶型对粉体的微观形貌和尺寸无明显影响。 展开更多
关键词 水热法 w合金粉末 ZrO_(2)晶型 形貌 相转变
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