沉积温度及走丝速度对SiC纤维拉伸强度和B_4C涂层厚度、表面形貌的影响  

Influence of Coating Temperature and Takeup Speed on Tensile Strength of SiC Fiber and Thickness and Surface Morphology of B4C Coating

作　　者：郑杰[1] 李国军[1] 李宝伟[2] 黄浩[2] 刘晓光[2] 

机构地区：[1]大连交通大学材料科学与工程学院,辽宁大连116028 [2]北京航空材料研究院,北京100095

出　　处：《航空材料学报》2008年第4期60-64,共5页Journal of Aeronautical Materials

摘　　要：采用CVD工艺在W芯SiC纤维表面涂覆B4C涂层,通过扫描电镜和纤维拉伸测试研究沉积温度和走丝速度对W芯SiC纤维拉伸强度和B4C涂层厚度、表面形貌的影响规律。结果表明,在1100℃以下不能获得B4C涂层。在一定的涂层参数下,可以获得与W芯SiC纤维的拉伸强度最接近(达3339MPa)的带B4C涂层的SiC纤维。且在其他涂层参数不变的情况下,为优化工艺参数,应符合沉积温度>1210℃时,走丝速度>0.055m/s;或沉积温度<1210℃时,走丝速度<0.055m/s。沉积温度影响SiC纤维的拉伸强度和B4C涂层厚度、表面形貌,走丝速度影响SiC纤维的拉伸强度和B4C涂层厚度。B4C coating on the W core SiC fibers were prepared via a CVD process. The influence of coating temperatures and takeup speeds on the tensile strength of SiC fibers, the thickness and the surface morphology of B4C coating were studied by scanning electronic microscope and tensile test. The results exhibited that it could not obtain B4C coating below a coating temperature of 1100℃. Above 1100℃ and under the given process parameters, the B4C coated fibers were obtained with a tensile strength close to the original fiber （ -3339 MPa）. To optimize the process parameters, it should satisfy that the coating temperature 〉 1210℃ and the takeup speed 〉0. 055m/s, or the coating temperature 〈 1210℃ and the takeup speed 〈0. 055m/s. The coating temperatures affected the tensile strength of SiC fibers, the thickness and the surface morphology of B4C coating significantly. The takeup speeds affected the tensile strength of SiC fibers and the thickness of B4C coating.

关 键 词：B4C涂层 沉积温度 走丝速度 拉伸强度 

分 类 号：TB332[一般工业技术—材料科学与工程]