%0 Journal Article
%T The die swelling of polycarbosilane and the profile degree of Y-shaped SiC fibers<br>聚碳硅烷的挤出胀大与Y型SiC纤维的异形度
%A WANG Yingde
%A XUE Jingen
%A LAN Xinyan
%A CHEN Yanmo
%A <br>王应德
%A 薛金根
%A 蓝新艳
%A 陈彦模
%J 材料研究学报
%D 2005
%I 
%X The die-swell mechanism of polycarbosilane(PCS) melt for a spinneret with Y-shaped orifice and the effect of die swelling of PCS on the profile degree (PD) of Y-shaped SiC were investigated. For a spinneret with circular holes, the die-swell ratio was in the range of 1.02-1.15, while for a spinneret with Y-shaped orifices, the ratio is 1.02-1.43. The die-swell ratio for a spinneret with Y-shaped orifices was about 15% higher than that with circular holes in the same forming condition. The asymmetric distribution of shear stress in the circumference of the Y-shaped orifice and the different shear stress in the orifice profiles were the fundamental reasons for the increase of the die-swell ratiofor the Y-shaped orifice. In comparison with the PD of the orifice, there was a reduction of 10%-20% in the PD of the fibers.
%K inorganic non-metallic materials
%K die-swell ratio
%K Y-shaped SiC fibers
%K profile degree<br>无机非金属材料
%K 膨胀比
%K Y型碳化硅纤维
%K 异形度
%K 聚碳硅烷
%K 挤出胀大
%K 碳化硅纤维
%K 异形度
%K SiC
%K fibers
%K degree
%K profile
%K polycarbosilane
%K 模口膨胀
%K 效应
%K 出口
%K 软化点
%K 温度降
%K 区域
%K 差异
%K 剪切应力分布
%K 口模
%K 情况
%K 成形条件
%K 结果
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=84529CA2B2E519AC&jid=C101C4C04993B4D94FCD8446E6CBEB3B&aid=E58360B65B8F2CCE&yid=2DD7160C83D0ACED&vid=2A8D03AD8076A2E3&iid=CA4FD0336C81A37A&sid=46CB27789995047D&eid=06EA2770E96C5402&journal_id=1005-3093&journal_name=材料研究学报&referenced_num=0&reference_num=8