Transactions of Nonferrous Metals Society of China The Chinese Journal of Nonferrous Metals

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中国有色金属学报

ZHONGGUO YOUSEJINSHU XUEBAO

第14卷    第5期    总第62期    2004年5月

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文章编号:1004-0609(2004)05-0707-06
镍-石墨高温自润滑材料的熔炼制备及其组织性能
朱定一, 关翔锋, 兑卫真, 陈丽娟

(福州大学 材料科学与工程学院, 福州 350002)

摘 要: 采用真空中频感应熔炼、电弧熔炼和高频感应熔炼辅助3m落管无容器快速凝固方法,制备出镍-石墨两相自润滑合金。 研究表明:在石墨型中浇铸, 石墨呈片状生长; 在金属型中浇铸, 石墨有球化趋势; 在电弧炉中熔炼并凝固, 石墨基本呈球状组织形态, 在3m落管中经深过冷快速凝固后石墨呈球状组织。 从而得出, 石墨在生长过程中,(101-0)棱面与(0001)基面的再辉温度差是影响石墨生长形态的重要因素。该材料具有高的冲击韧性和较低的电阻率, 与45#退火钢及GCr15轴承钢干摩擦磨损时, 摩擦因数分别稳定在0.23和0.15。

 

关键字: 镍-石墨合金;自润滑; 熔炼法; 组织; 球化

Preparation and structure property of high-temperature self-lubricating Ni-graphite alloy by melting method
ZHU Ding-yi, GUAN Xiang-feng, DUI Wei-zhen, CHEN Li-juan

School of Materials Science and Engineering, 
Fuzhou University, Fuzhou 350002, China

Abstract: Self-lubricating two-phase Ni-graphite alloy was produced by methods of vacuum medium-frequency induction melting, arc melting and containerless rapid solidification process of 3m drop tube assisted by high-frequency induction melting. The results show that graphite cast in graphite mold grows in lamellar shape; graphite cast in metal mold tends to be spheroidized; graphite smelting and solidifying in arc furnace is in globular shape, and homogeneous globular graphite is achieved in rapidly-solidified alloy prepared by 3m drop tube. It has been presented that the recalescence temperature difference between (101-0)edge plane and (0001)basal plane of graphite in graphite growing procedure is an important influencing factor on the growth morphology of graphite. The Ni-graphite alloy shows high impact flexibility and low electrical resistivity. Through dry friction and wear experiment against 45# steel and GCr15, it is found that the friction coefficient of the alloy stably remains 0.23 and 0.15, respectively. 

 

Key words: Ni-graphite alloy; self-lubricating; melting method; structure; spheroidization

ISSN 1004-0609
CN 43-1238/TG
CODEN: ZYJXFK

ISSN 1003-6326
CN 43-1239/TG
CODEN: TNMCEW

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