| 引用本文: | 王梦千,贾林涛,刘瑶瑶,茅思佳,朱界,李爱军,彭雨晴,李照谦.ICVI工艺参数对碳/碳复合材料快速均匀致密化的影响[J].材料科学与工艺,2021,29(4):25-32.DOI:10.11951/j.issn.1005-0299.20200330. |
| WANG Mengqian,JIA Lintao,LIU Yaoyao,MAO Sijia,ZHU Jie,LI Aijun,PENG Yuqing,LI Zhaoqian.Effect of ICVI process parameters on the rapid and uniform densification of Carbon/Carbon composite[J].Materials Science and Technology,2021,29(4):25-32.DOI:10.11951/j.issn.1005-0299.20200330. |
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| ICVI工艺参数对碳/碳复合材料快速均匀致密化的影响 |
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王梦千1, 贾林涛1, 刘瑶瑶1, 茅思佳1, 朱界1, 李爱军1,2, 彭雨晴1, 李照谦3
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(1.上海大学 材料科学与工程学院 材料研究所,上海 200444;2.上海大学 绍兴研究院,浙江 绍兴 312000;3.上海航天设备制造厂,上海 201100)
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| 摘要: |
| 为了研究碳/碳(C/C)复合材料的快速均匀致密化工艺,参考工业天然气的成分,以92%甲烷(CH4)、5%乙烷(C2H6)、3%丙烷(C3H6)组成的混合气作为前驱体,在沉积温度为1 075 ℃时,采用等温化学气相渗透(ICVI)工艺,在不同系统压力和滞留时间下对16和26 mm两种厚度的碳纤维针刺预制体进行120 h致密化,制备C/C复合材料。对制备出的C/C复合材料进行轴向和径向切割取样,利用多功能密度测试仪研究压力和滞留时间对C/C复合材料致密化速度和均匀性的影响。结果表明:沉积温度为1 075 ℃,滞留时间为1.0 s时,20 kPa下,经过120 h致密化后,16和26 mm厚度的C/C复合材料平均密度分别为1.45和1.43 g/cm3,较10 kPa压力下的平均密度(1.06和0.91 g/cm3)有明显提高,且厚度对C/C复合材料密度均匀性的影响减小。沉积温度为1 075 ℃,压力为20 kPa时,将滞留时间降低到0.1 s,经过120 h致密化后,16和26 mm厚度的C/C复合材料平均密度均达到1.7 g/cm3以上,厚度对前驱气体在预制体内渗透效果的限制作用非常小；并且,在此实验条件下制备出沿气流方向密度均匀性比较理想的C/C复合材料。基于热解碳沉积反应机理,利用COMSOL软件对不同ICVI条件下C/C复合材料进行了致密化过程的数值模拟分析,模拟结果与实验中获得的C/C复合材料的致密化效果具有较高的一致性。 |
| 关键词: 碳/碳(C/C)复合材料 等温化学气相渗透(ICVI) 密度 致密化 数值模拟 |
| DOI：10.11951/j.issn.1005-0299.20200330 |
| 分类号:TB33 |
| 文献标识码:A |
| 基金项目:国家自然科学基金资助项目(21676163,51602189);航空科学基金资助项目(2017SF26001);上海市自然基金资助项目(18ZR1417700). |
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| Effect of ICVI process parameters on the rapid and uniform densification of Carbon/Carbon composite |
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WANG Mengqian1, JIA Lintao1, LIU Yaoyao1, MAO Sijia1, ZHU Jie1, LI Aijun1,2, PENG Yuqing1, LI Zhaoqian3
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(1. Institute of Materials, School of Materials Science and Engineering, Shanghai University, Shanghai 200444, China; 2. Shaoxing Institute of Technology, Shanghai University, Shaoxing 312000, China; 3. Shanghai Aerospace Equipment Manufacturer, Shanghai 201100, China)
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| Abstract: |
| In order to study the rapid and uniform densification process of Carbon/Carbon (C/C) composites, referring to the composition of industrial natural gas, a mixture of 92% methane (CH4), 5% ethane (C2H6) and 3% propane (C3H6) was used as the precursor for the densification of C/C composites. At the deposition temperature of 1 075 ℃, the carbon fiber needled punched preforms of 16 mm and 26 mm in thickness were densified for 120 h by isothermal chemical vapor infiltration (ICVI) process under different system pressures and residence times to prepare C/C composites. The influence of pressure and residence time on the densification rate and uniformity of C/C composites was studied by multi-functional density tester. The results show that the average density of 16 mm and 26 mm thickness C/C composites was 1.45 g/cm3 and 1.43 g/cm3 respectively after 120 h densification at 1 075 ℃ and 1.0 s residence time, which is significantly higher than that at 10 kPa (1.06 g/cm3 and 0.91 g / cm3), and the thickness had little effect on the density uniformity of C/C composites. When the deposition temperature was 1 075 ℃ and the pressure was 20 kPa, the residence time was reduced to 0.1 s. After 120 h of densification, the average density of 16 mm and 26 mm thickness C/C composites was over 1.7 g/cm3, and the thickness had little effect on the permeability of precursor gas in the preform. Under the experimental conditions, C/C composites with ideal density uniformity along the air flow direction were prepared. The densification process of C/C composites under different ICVI conditions was simulated and discussed by numerical simulation using COMSOL software, which is consistent with the obtained experimental results. |
| Key words: Carbon/Carbon (C/C) composites isothermal chemical vapor infiltration (ICVI) density densification numerical simulation |
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