摘要
采用无压浸渗复合新方法和自行研制的专用工艺设备，低成本地制备了用作空间光机结构件的高体份（55％～57％）SiC／Al复合材料大尺寸坯锭，并对其微观结构特征、基本的力学及热物理性能和断裂机制予以表征。此外，还通过线切割、电火花成型等特种加工手段将该种复合材料制造成反射镜背板、焦面板等一系列空间光机结构用典型样件。研究结果表明，该材料既有优异的结构承载功能（弹性模量213GPa，而比模量则比铝合金、钛合金及钢高出近两倍），又有卓越的热控功能（其热膨胀系数比钛合金还要低，热导率接近纯铝，达到235W／m·K），若以其替代钛合金用于空间光机结构可望获得显著的轻量化效果并降低热控负荷、改善热控效果。
Using the special self-manufactured processing equipment, we fabricated the aluminium matrix composites with high volume fraction （55%～57%） SiC particles based on a novel pressureless infiltration fabrication technology. The microstructures, mechanical and physical properties, fracture mechanism of the composites were characterized. Additionally, several kinds of typical optomechanical components for space-based optical systems were produced successfully by means of electromachining （such as wire electrical discharge）, grinding , abrading, etc. The investigation reveals that the composites have good mechanical properties, such as ultra-high modulus （the Young’s modulus is 213 GPa, the specific modulus is approximately as three times as Al, Ti, and steel）, as well as prominent thermal management function（low thermal expansion coefficient （8 × 10^-6 K^-1）, and very high thermal conductivity （235 W/m · K））. Experimental results show that the new multi-function and lightweight SiC/Al composites can be used in the optomechanical systems in the space field to improve greatly the thermal management effect and to sharply decrease the whole weight of the space-based optomechanic structure.
出处
《光学精密工程》
EI
CAS
CSCD
北大核心
2007年第8期1175-1180,共6页
Optics and Precision Engineering
基金
航空基金资助项目(No.03G21012)
武器装备预研基金资助项目(No.51412010304HK5106
No.51460040204ZK1001)
关键词
SIC/AL复合材料
高体份
无压浸渗
空间光机结构
SiC/Al composite
high volume fraction
pressureless infiltration
space-based optomechanical structure
