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挤压成形石墨的高温拉伸和弯曲性能
发表时间：2011-05-15 浏览量：1780 下载量：825
| 全部作者： | 张程煜，乔生儒，李玫，韩栋，何续斌 |
| 作者单位： | 西北工业大学超高温结构复合材料国家重点实验室 |
| 摘 要： | 研究挤压成形的石墨材料的高温拉伸和弯曲性能，并使用扫描电子显微镜(scanning electron microscope, SEM)进行断口分析。研究结果表明：室温至2 000摄氏度的温度范围内，材料的强度和模量均随温度的升高而增大。同时石墨具有明显的各向异性，径向的力学性能均大于轴向性能，这与石墨微晶的取向在2个方向有密切关系。不论是轴向还是径向，石墨的弯曲强度和模量均大于拉伸强度和模量，表明石墨材料对应力梯度下的变形具有更大的抗力。 |
| 关 键 词： | 材料学；石墨；拉伸强度；拉伸模量；弯曲强度；弯曲模量 |
| Title： | Tensile and flexural properties of graphite prepared by extrusion moulding at elevated temperatures |
| Author： | ZHANG Chengyu, QIAO Shengru, LI Mei, HAN Dong, HE Xubin |
| Organization： | National Key Laboratory of Thermostructure Composite Materials, Northwestern Polytechnical University |
| Abstract： | The tensile and flexural properties of the graphite made by extrusion molding were investigated at high temperatures. The fracture morphology was surveyed by a scanning electron microscope. The results show that the strength and modulus increase with the temperature up to 2 000℃. The radial properties of the material are apparently higher than the axial properties, showing the anisotropic character of the graphite. It can be explained by the different orientation of basal planes of the graphite crystals. The flexural properties are higher than the tensile properties. The phenomena indicate that the graphite possesses higher resistance to stress gradient than uniform tensile stress. |
| Key words： | material science；graphite; tensile strength; tensile modulus; flexural strength; flexural modulus |
| 发表期数： | 2011年5月第9期 |
| 引用格式： | 张程煜，乔生儒，李玫，等. 挤压成形石墨的高温拉伸和弯曲性能[J]. 中国科技论文在线精品论文，2011，4（9）：850-854. |
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