第31卷第7期 硅酸盐学报 2003年7月 JOURNAL OF THE CHINESE CERAMIC SOCIETY Juy,2003 碳/碳复合材料等温化学气相渗透工艺模糊系统建模 顾正彬,李贺军,李克智,李爱军 (西北工业大学材料科学与工程系,西安710072) 摘要:等温化学气相渗透( chemical vapor infiltration,CVD是制备陶瓷基和碳基复合材料重要的传统工艺,该工艺主要的不足之处是周期极 长,因此,优化工艺参数、提高沉积效率是目前等温CⅥ工艺研究的重点。在实验样本的基础上,利用遗传算法来自动获取和优化模糊规 则,从而建立了碳/碳复合材料等温CVI工艺模糊系统。通过系统对训练样本和测试样本的输出,可以看出:系统具有较高的精度和泛化能 力。利用该系统,得到了沉积温度、纤维体积分数和沉积室压强等参数对等温CVI工艺的影响规律,对实际生产中CVI工艺的制定有指导 意义 关键词:碳/碳复合材料;化学气相渗透;模糊系统;遗传算法 中图分类号:TB323文献标识码:A文章编号:0454-5648(2003)07-0629- FUZZY SYSTEM MOD EL FOR ISOTHERMAL CHEMICAL VAPOR INFIL TRATION PROCESS OF CARBONCARBON COMPOSITES GU Zhengbin, LI Hejun, LI Keshi, LI Aijun Department of Materials Science and Engineering, Northwestern Polytechnical University, Xi' an 710072, China) Abstract: Isothermal chemical vapor infiltration(CvI) is an important conventional technique for fabrication of ceramic and carbon matrix composites. The major disadvantage of isothermal CVI process is the extremely long processing time required. Therefore the key point of research on isot hermal CVI technique is to optimize process parameters and to raise the deposition efficiency. Based on the experimental results, the fuzzy rules were automatically obtained and optimized by genetic algorithm, thus the fuzzy system for isothermal CVI of carbon/ carbon composites was established. Through the analysis of the outp ut of training and testing samples, we could draw a conclusion that this system is characterized by higher precision and good generalization ability. With the help of this sys- tem the regulation affecting infiltration temperature, fiber content and chamber pressure in isothermal CVI were analyzed. The results show that this system has a good instructive function for formulating of CvI processes in practical application. Key words carbon/ carbon composites; chemical vapor infiltration; fuzzy system; genetic algorithm 碳/碳复合材料综合了纤维增强复合材料优良 致密化工艺是碳/碳复合材料制备的关键技术 的力学性能和碳材料优异的高温性能,拥有诸多特之一,其中等温化学气相渗透( chemical vapor infil- 殊而且优异的物理、化学和力学性能,而被应用于 tration,CVD是传统的致密化工艺,主要不足是沉 航空、航天领域口,其在民用工业的应用领域也十积周期长、能耗大,因而导致碳/碳复合材料成本 分广阔 居高不下。为降低制备成本,某些发达国家,如:美、 收稿日期:2003-01-02。修改稿收到日期:2003-02-28。 Received date: 2003-01-02 Approved date: 2003-02-28 基金项目:国家自然科学基金(50072019)和国家杰出青年科学基金 Bogra phy: GU Zhengbin(1973-),male, postgraduate for doctor de- (50225210)资助项目 作者简介:顾正彬(1973~),男,博士研究生 201994-2010ChinaAcademicJOurnalElectronicpUblishingHouse.Allrightsreservedhttp://www.cnki.net第 31 卷第 7 期 硅 酸 盐 学 报 Vol. 31 ,No. 7 2 0 0 3 年 7 月 JOURNAL OF THE CHINESE CERAMIC SOCIETY J uly , 2 0 0 3 碳/ 碳复合材料等温化学气相渗透工艺模糊系统建模 顾正彬 , 李贺军 , 李克智 , 李爱军 (西北工业大学材料科学与工程系 , 西安 710072) 摘 要 : 等温化学气相渗透(chemical vapor infiltration , CVI) 是制备陶瓷基和碳基复合材料重要的传统工艺 , 该工艺主要的不足之处是周期极 长 , 因此 , 优化工艺参数、提高沉积效率是目前等温 CVI 工艺研究的重点。在实验样本的基础上 , 利用遗传算法来自动获取和优化模糊规 则 , 从而建立了碳/ 碳复合材料等温 CVI 工艺模糊系统。通过系统对训练样本和测试样本的输出 , 可以看出 : 系统具有较高的精度和泛化能 力。利用该系统 , 得到了沉积温度、纤维体积分数和沉积室压强等参数对等温 CVI 工艺的影响规律 , 对实际生产中 CVI 工艺的制定有指导 意义。 关键词 : 碳/ 碳复合材料 ; 化学气相渗透 ; 模糊系统 ; 遗传算法 中图分类号: TB 323 文献标识码 : A 文章编号 : 0454 5648 (2003) 07 0629 06 FUZZY SYSTEM MODEL FOR ISOTHERMAL CHEMICAL VAPOR INFILTRATION PROCESS OF CARBON/ CARBON COMPOSITES GU Zhengbin , L I Hejun , L I Kez hi , L I A ijun (Department of Materials Science and Engineering , Northwestern Polytechnical University , Xi′an 710072 ,China) Abstract : Isothermal chemical vapor infiltration (CVI) is an important conventional technique for fabrication of ceramic and carbon matrix composites. The major disadvantage of isothermal CVI process is the extremely long processing time required. Therefore the key point of research on isothermal CVI technique is to optimize process parameters and to raise the deposition efficiency. Based on the experimental results , the fuzzy rules were automatically obtained and optimized by genetic algorithm , thus the fuzzy system for isothermal CVI of carbon/ carbon composites was established. Through the analysis of the output of training and testing samples , we could draw a conclusion that this system is characterized by higher precision and good generalization ability. With the help of this sys2 tem the regulation affecting infiltration temperature , fiber content and chamber pressure in isothermal CVI were analyzed. The results show that this system has a good instructive function for formulating of CVI processes in practical application. Key words : carbon/ carbon composites; chemical vapor infiltration ; fuzzy system ; genetic algorithm 碳/ 碳复合材料综合了纤维增强复合材料优良 的力学性能和碳材料优异的高温性能 , 拥有诸多特 殊而且优异的物理、化学和力学性能 , 而被应用于 航空、航天领域[1 ] , 其在民用工业的应用领域也十 分广阔。 收稿日期 : 2003 01 02。修改稿收到日期 : 2003 02 28。 基金项目 : 国家自然科学基金(50072019) 和国家杰出青年科学基金 (50225210) 资助项目。 作者简介 : 顾正彬(1973～) , 男 , 博士研究生。 致密化工艺是碳/ 碳复合材料制备的关键技术 之一 , 其中等温化学气相渗透(chemical vapor infil2 tration , CV I) 是传统的致密化工艺 , 主要不足是沉 积周期长、能耗大 , 因而导致碳/ 碳复合材料成本 居高不下。为降低制备成本 , 某些发达国家 ,如: 美、 Received date : 2003 01 02. Approved date : 2003 02 28. Biography : GU Zhengbin (1973 —) , male , postgraduate for doctor de2 gree. E mail : guzb @eyou. com