低压化学气相渗透法制备2.5维SiCfSiC复合材料.pdf

第36卷第2期 硅酸盐学报 V01．36，No．2 2008年2月 0FTHECHINESECERAMICSOCIETY JOURNAL Febma拶，2008 低压化学气相渗透法制备2．5维SiC／SiC复合材料 于新民，周万城，罗发 (西北工业大学，凝固技术国家重点实验室，西安710072) 孔率。纤维为41％时，热解炭界面层厚度为0．1岫的sic—sic的弯曲强度只有244MPa，但是它具有更高的韧性和更长的纤维拔出长度。 关键词：碳化硅纤维磁化硅；低压化学气相渗透法；界面层；力学性能 中图分类号：TB332文献标识码：A 文章编号：045扯5648(2008)02_0150_04 Ff姬RICATEDBYLoWPRESSURE 2．5-DIMENSIoNCoMPoSITES SiC洚iC CHEMICAL、厂APoR矾FⅡ用RATIoN lU Fa X{nm锄，zHOU晌nche昭，LUo (NationalKeyLabo咖ofSolidificationProcess协g，Nor吐1west锄P01ytechnicalUniVers峨Xi’an710072，Ch协a) carbidefiberreinforcedsiliconc抽idc t11einteI_f如ewithand Abstract：2．5．mmensioncominuoussilicon composites(SiC—SiC)0n wi出outa werefabricatedlow ch锄ical in6l廿ation．Thevolume丘actionsofSiCfiberwere30％ pyrocarbonlayer by pressure vapor and4l％．The ofthefabricated wasabout20％。Theflex啪l ofthe with30％fiber porosity composites s虹它ngth SiC／SiCcomposite aIld aIl about increased舶m232Mpato328MPaand廿le妇turebehavior havinginterf沁epymcarbonlayer 0．1岬thick chaIlged 丘omcatas仃ophicfailllretonon—catas仃ophicfailure witht11e winlouttIle layer．The me comparedcomposite p”ocarbon porosi够of itlcre嬲edwiththei11creaseoffibervolumefhctionf而m30％to4l％When也ef．ab矗cation conditions compositesligtltIy process weres狮e．The of wi廿141％fiberandanimerfaceabout0．1 t11ickwas 244 the nexuml蚰．e119mSiC—SiC