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首页> 外文期刊>Journal of Materials Engineering and Performance >Microstructures and Properties of Graphite Nanoflake/6061Al Matrix Composites Fabricated via Spark Plasma Sintering
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Microstructures and Properties of Graphite Nanoflake/6061Al Matrix Composites Fabricated via Spark Plasma Sintering

机译：通过火花等离子体烧结制造石墨纳米铝油/ 6061Al基质复合材料的微观结构及性能

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摘要

Two types of graphite nanoflakes (GNFs), GNF(A) for 30-100 mu m in diameter and less than 100 nm in thickness, and GNF(B) for 0.5-10 mu m in diameter and less than 20 nm in thickness, were used to fabricate GNF/6061Al matrix composites with GNF fractions ranging from 5 to 15 wt.% via spark plasma sintering (SPS) at 610 degrees C under a load of 35 MPa. The effects of GNF size and content on microstructures and properties of the composites were investigated. The results show that uniform mixing of GNFs in the 6061Al powder was achieved through mechanical and ultrasonic stirring. When the GNFs were well dispersed, the composites were dense. An interfacial zone of 15-18 nm in thickness was formed and composed of two layers, a poorly crystalline layer and an amorphous layer. No Al4C3 was detected in the interfacial zone. The relative densities, bending strengths, thermal conductivities (TCs), and coefficients of thermal expansion (CTEs) (room temperature to 100 degrees C) of the 10 wt.% GNF(A)/6061Al matrix composites were 98.5%, 120 MPa, 155 W m(-1) K-1 in the X-Y direction and 61 W m(-1) K-1 in the Z direction, and 14.2 ppm K-1 in the X-Y direction and 12.1 ppm K-1 in the Z direction, respectively. Those of the 10 wt.% GNF(B)/6061Al matrix composites were 97.8%, 70 MPa, 110 W m(-1) K-1 in the X-Y direction and 90 W m(-1) K-1 in the Z direction, and 15.4 ppm K-1 in the X-Y direction and 14.7 ppm K-1 in the Z direction, respectively. The GNF(B)/6061Al matrix composites showed lower differences of TC and CTE between the X-Y and Z directions. Therefore, the anisotropy of the microstructures and properties of the composites in three dimensions were significantly reduced.
机译：两种类型的石墨纳米薄膜（GNF），直径为30-100μm的GNF（A），厚度小于100nm，而GNF（B）的直径为0.5-10μm，厚度小于20nm，用于制造GNF / 6061AL基质复合材料，GNF级分在5-15重量％中的范围为5至15重量％。在310℃下通过火花等离子体烧结（SPS）在35MPa的负载下。研究了GNF尺寸和含量对复合材料的微观结构和性质的影响。结果表明，通过机械和超声波搅拌实现了6061AL粉末中GNF的均匀混合。当GNF分散良好时，复合材料致密。形成厚度为15-18nm的界面区域，并由两层，结晶层和无定形层组成。在界面区中检测到Al 4C3。 10wt的相对密度，弯曲强度，热导体（TCS）和热膨胀系数（CTES）（室温至100摄氏度）的系数％。％GNF（A）/ 6061Al基质复合材料为98.5％，120MPa，在XY方向上的155 W m（-1）k-1和Z方向上的61W m（-1）k-1，XY方向上的14.2ppm k-1和Z方向12.1ppm k-1 ， 分别。 10重量％。％GNF（B）/ 6061AL基质复合材料在XY方向上为97.8％，70MPa，110W m（-1）k-1，Z中90W m（-1）k-1方向，XY方向上的15.4 ppm k-1分别在Z方向上的14.7ppm k-1。 GNF（B）/ 6061AL矩阵复合材料显示X-Y和Z方向之间的TC和CTE的差异较低。因此，三维组合材料的微观结构和性质的各向异性显着降低。

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