低温反应熔渗工艺制备C_f/ZrC复合材料  

Preparation of C_f/ZrC Composites by Reactive Melt Infiltration at Relatively Low Temperature

作　　者：祝玉林[1] 王松[1] 李伟[1] 陈朝辉[1] 

机构地区：[1]国防科学技术大学 新型陶瓷纤维及其复合材料重点实验室,湖南长沙410073

出　　处：《稀有金属材料与工程》2013年第S1期447-450,共4页Rare Metal Materials and Engineering

基　　金：国家自然科学基金重大专项(90916002)

摘　　要：采用反应熔渗工艺,在1200℃、真空环境下将熔融态Zr2Cu合金渗入多孔Cf/C基材制得Cf/ZrC复合材料。结果表明,材料中ZrC含量为(43.8±1.3)%(体积分数,下同),材料弯曲强度为(105.7±5.3)MPa,弹性模量为(64.3±2.8)GPa;ZrC生长机制为"溶解-析出"机制:C基体逐步溶解在Zr-Cu熔液中并形成C-Zr-Cu固溶体,C浓度饱和后逐步析出ZrC纳米晶核,随即通过晶粒融合和元素扩散使晶粒迅速长大;Cf/ZrC复合材料具有优异的抗烧蚀性能,其质量烧蚀率和线烧蚀率分别为(0.0039±0.0008)g/s和(0.0023±0.0012)mm/s。Cf/ZrC composite was prepared by infiltrating porous Cf/C preform with melting Zr2 Cu alloy at 1200 ℃ in vacuum. The results show that the ZrC as the main phase has a content of 43.8±1.3% (volume fraction). The flexural strength and modulus is 105.7±5.3 MPa and 64.3±2.8 GPa, respectively. ZrC growth is controlled by solution-precipitation mechanism. The carbon dissolves in the melting metals and forms C-Zr-Cu miscible phase. Then ZrC nanocrystals are deposited after the melt is saturated, and grow quickly by amalgamation and diffusion. The mass loss rate and linear recession rate of the sample is 0.0039 ± 0.0008 g/s and 0.0023 ± 0.0012 mm/s, respectively. So the Cf/ZrC composites show good anti-ablation properties.

关 键 词：Cf/ZrC复合材料 反应熔渗 溶解-析出 抗烧蚀性能 

分 类 号：TQ174.1[化学工程—陶瓷工业]