排序方式: 共有14条查询结果,搜索用时 131 毫秒
1.
2.
用化学气相渗法制备炭纤维增强炭—炭化硅梯度基复合材料 总被引:3,自引:0,他引:3
本文论述了用化学气相渗法备炭纤维增强C-SiC梯度基复合材料,通过改变原料气体成分配比控制基体微观结构的变化,给出各工艺参数选择的依据及控制的要点,分析了材料微观结构。 相似文献
3.
4.
5.
6.
炭纤维增强C—SiC梯度基复合材料的结构与性能 总被引:3,自引:0,他引:3
对梯度基复合材料的力学性能,抗氧化性能,摩擦性能进行全面的测试与评价,分析微观结构与性能之间的关系。梯度基复合材料具有与C/C材料相当的力学性能和相似的断裂行为;它的抗氧化性能明显好于C/C材料;摩擦实验表明,C/C仍是最好的摩擦材料。 相似文献
7.
8.
The ablation properties of C/C composites with four different needled preforms prepared by isothermal chemical vapor infiltration (ICVI),which are super-thin mat lay-up,0°/90° weftless fabric lay-up,0°/45° weftless fabric lay-up and 0°/45° twill fabric lay-up,were quantitatively evaluated by performing the ablation tests with an engine torch.And their ablation discrepancies were analyzed according to the surface characteristic,porosity and thermal diffusivity.The results show that the 0°/45° weftless composite has a flat eroded surface with no obvious macroscopic pits.Its thickness and mass erosion rates are decreased by about 46.8% and 34.8%,25.0% and 27.5%,and 17.5% and 19.4% compared with those of the mat,the 0°/90° weftless and the 0°/45° twill composites,respectively.The ablation properties are mainly controlled by the thermo-chemical effect (oxidation),and a little by the thermo-mechanical effect (mechanical denudation).The needling fiber bundles play an important role in accelerating the ablation process and resulting in the heterogeneous ablation. 相似文献
9.
C/C材料具有优良的物理性能,可以代替钢和其它一些材料在尖端领域应用,如飞机和赛车的刹车片、火箭喷管和再入热防护等。C/C材料最主要的应用是飞机刹车片,约占总产量的60%~70%。飞机刹车市场每年近8亿美元,目前C/C占25%,到2000年将达到50%。当C/C材料价格大幅度降低时,在很多需要高比强度、高热导、高电导的地方都可以使用。 相似文献
10.