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17卷    第12期    总第105期    2007年12月

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文章编号:1004-0609(2007)12-2023-06
近净成形制备SiCp/Al复合材料Ⅱ:SiC预成形坯自发熔渗Z101
刘君武,郑治祥,吴玉程,王建民,汤文明,吕 君,徐光青

(合肥工业大学 材料科学与工程学院,合肥 230009)

摘 要: 以超细SiC(W7)为原料制备的SiC多孔骨架为先驱体,采用无压渗透工艺制备出致密、增强体分布均匀的SiC/Al复合材料。SiC-Al间存在厚度为0.3~0.5 μm的界面层,该界面层能很好地被铝液润湿,并阻止铝液与SiC的接触与反应。SiC坯体渗入铝合金后无形状和尺寸的变化,能够实现制品的近净成形。加入SiC后,铝合金的强度显著提高,弹性模量提高近1倍。细颗粒的SiC能更好地抑制铝基体的热膨胀。材料的热学性能可通过SiC的含量来调整,SiC体积分数介于37%54%之间时,室温导热系数介于136 W/(m∙K)118 W/(m∙K)之间,室温至100 的平均线热膨胀系数介于9.98×10−6 K−17.69×10−6 K−1之间。

 

关键字: SiC/Al;自发渗透;近净成形;热膨胀

Fabrication of SiC/Al composites with near-net-shapeⅡ:Spontaneous infiltration of Z101 into SiC preforms
LIU Jun-wu, ZHENG Zhi-xiang, Wu Yu-cheng, WANG Jian-min, TANG Wen-ming, LÜ Jun, XU Guang-qing

School of Materials Science and Engineering, Hefei University of Technology,Hefei 230009, China

Abstract:Compact SiC/Al composites with SiC particles uniformly distributing were fabricated by spontaneous infiltration of liquid Z101 alloy into porous SiC preforms deriving from super-fine SiC powders (W7). An interface layer ranging from 0.3 μm to 0.5 μm in thickness exists between SiC filler and Al alloy matrix. The interfacial layer can be wetted well by liquid Al alloy and prevent the directly contact and reaction between liquid Al alloy and the filler. Preforms have no change in shape and dimension after infiltration thus the near-net-shape products can be achieved. The strength of aluminum alloy can be improved remarkably by the addition of SiC particles, and its elastic modulus increases correspondingly about one time. The finer SiC particulates restrict the thermal expansion of Al alloy matrix for more. The thermal properties of SiC/Al composites can be modulated by changing volume fraction of SiC: the thermal conductivity of SiC/Al composites at room temperature ranges from 136 W/(m∙K) to 118 W/(m∙K) and its mean linear coefficient of thermal expansion (room temperature to 100 ℃) ranges from 9.98×10−6 K−1 to 7.69×10−6 K−1 as volume fraction of SiC ranges from 37% to 54%.

 

Key words: SiC/Al; spontaneous infiltration; near-net-shape; thermal expansion

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

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

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