Preparation of graphene-reinforced titanium matrix composites by vacuum hot pressing
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摘要: 采用葡萄糖和钛粉真空热压烧结原位合成了钛基体-石墨烯复合材料。复合材料界面结构稳定，界面处产生的石墨烯片层结构清晰，条纹间距约为 0.32 nm，与石墨层片理论间距 0.337 nm 相近。特别值得一提的是：在1300℃烧结条件下，复合材料屈服强度和延伸率跟相同条件制备的纯钛样品相比都在增加。其原因可能是原位合成的石墨烯和纳米颗粒TiC在钛基体内协调变形，为缓和复合材料的强塑性矛盾提供很好的解决思路。Abstract: In this paper, titanium matrix-graphene composites were successfully in-situ synthesized using glucose as carbon source. Graphene-reinforced pure titanium matrix composites were prepared in situ by vacuum hot-pressing sintering method using glucose solution and pure titanium powder as raw materials. The interfacial structure of the composite prepared by in-situ synthesis is stable, the structure of graphene lamellae at the interface is clear, and the spacing of striations is about 0.32 nm, which is close to the theoretical spacing of graphite lamellae of 0.337 nm. It can be concluded that the component is multilayer graphene. At 1 300 ℃, compared with pure titanium sintered under the same condition, the yield strength and elongation of the in situ synthesized composites increase, it provides a good way to solve the contradiction of strength and plasticity of composite materials.
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图 4 复合材料热轧前后的金相照片
（a）热轧前；（b）热轧后
Figure 4. Metallograph of composite materials before and after hot rolling
图 6 复合材料的透射图片及高分辨分析
Figure 6. TEM image and high-resolution TEM image of the composite material
图 7 不同放大倍数下复合材料的拉伸断口
Figure 7. SEM images of the tensile fracture of the composite material at different magnifications
图 8 复合材料中GNPs分布与Ti基体处TEM的高分辨与其SADP
(a)和（b）为钛基体；(c)和（d）为增强体GNPs
Figure 8. Distribution of GNPs in composites and high-resolution TEM of Ti matrix and its SADP
图 9 复合材料中钛基体形成石墨烯的原理示意
Figure 9. Schematic of the mechanism of graphene formation on titanium matrix in composite materials
表 1 复合材料在不同烧结温度下的拉曼数据
Table 1. Raman data of composites at different sintering temperatures
烧结温度/℃ G峰值/cm−1 2D峰值/cm−1 ID/IG I2D/IG 1100 1584 2696 0.45 0.38 1200 1586 2719 0.51 0.78 1300 1589 2748 0.61 1.13 
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表 2 不同烧结温度复合材料的室温拉伸性能
Table 2. Room-temperature tensile properties of composites with different sintering temperatures
烧结温度/°C 屈服强度/MPa 延伸率/% 纯钛 复合材料 纯钛 复合材料 1100 556.4 785.5 35.6 35.2 1200 547.5 688.3 38.2 36.8 1300 478.5 587.3 35.2 36.6
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表 3 复合材料石墨烯边缘厚度统计
Table 3. Statistics of graphene edge thickness in composite material
尺寸/nm 片数/片 占比/% 2～4 12 30 5～9 20 50 15～18 8 20
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