1 Mechanical Engineering College, Xi'an Shiyou University, Xi'an 710065, China 2 School of Mechano-Electronic Engineering, Xidian University, Xi'an 710071, China
In order to prepare low expansion, high strength and light weight composites, ZrW2O8-Cf/E51 composites were prepared by compression molding method, and the effects of ultrasonic time on its microstructure, thermal expansion behavior and ultimate tensile strength were studied. The results show that the agglomerated particles will be blocked by the fibers and gather on the surface of fiber bundles during the preparation. Within 20 minutes, the agglomeration of ZrW2O8 particles can be reduced by prolonging the ultrasonic time. With the decrease of particle agglomeration, the fracture surface of the composites will be changed from plane without fiber pull-out to uneven with fiber pull-out. During the thermal expansion process, the dL/L0of ZrW2O8-Cf/E51 composites show three stages: increase, decrease and slow increase under the combined action of carbon fiber and ZrW2O8 particles. When ultrasonic time increases from 5 min to 20 min, the average thermal expansion coefficient of ZrW2O8-Cf/E51 composites decreases by about 130%, and the ultimate tensile strength increases by about 8%.
Fig.2 不同超声时间ZrW2O8/E51复合材料的微观组织(a)5 min；(b)10 min；(c)15 min；(d)20 min
Fig.3 不同超声时间ZrW2O8-Cf/E51复合材料的微观组织(a)5 min；(b)10 min；(c)15 min；(d)20 min
Fig.4 复合材料热膨胀过程中应力和应变示意图 (a)基体的应力；(b)试样的应变
Ultrasonic time
Point A
Point C
Point D
Point E
T/℃
(dL/L0)/10-4
α/10-6 ℃-1
T/℃
(dL/L0)/10-4
α/10-6 ℃-1
T/℃
(dL/L0)/10-4
α/10-6 ℃-1
T/℃
(dL/L0)/10-4
α/10-6 ℃-1
5
30
0.64
12.70
48.61
2.66
11.30
73.90
0.92
1.89
100
1.74
2.32
10
30
0.54
10.80
46.94
2.28
10.40
75.41
0.19
0.38
100
0.68
0.90
15
30
0.49
9.76
45.83
1.94
9.29
79.48
-0.26
-0.48
100
0.10
0.13
20
30
0.39
7.87
40.17
0.95
6.27
79.59
-0.80
-1.47
100
-0.53
-0.79
Table 3 不同超声时间ZrW2O8-Cf/E51复合材料的热性能
Fig.5 团聚颗粒的微观照片
Fig.6 不同超声时间下ZrW2O8-Cf/E51复合材料的拉伸强度
Fig.7 不同超声时间下ZrW2O8-Cf/E51的拉伸断口形貌(a)5 min；(b)10 min；(c)15 min；(d)20 min
Fig.8 纤维拔出示意图[19]
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2023, Vol. 51 
), 张建兵1, 马玉钦2, 张钊源1, 魏文澜1
