朱云洲
,
黄政仁
,
董绍明
,
袁明
,
江东亮
无机材料学报
doi:10.3724/SP.J.1077.2007.00959
采用微米级Al粉作为活性填料, SiC微粉作为惰性填料, 聚碳硅烷作为陶瓷前驱体制备SiC基复相陶瓷. 研究了热解温度和保温时间对陶瓷产率、线收缩率、力学性能以及微观结构的影响. 研究表明, 由于活性Al粉颗粒在热解过程中与含碳的有机小分子以及反应性气氛发生氮化和碳化反应, 产生体积膨胀效应, 热解陶瓷表现为小收缩、高产率, 可以满足近净尺寸成型的要求. 在1000℃热解保温1h, 线收缩率为0.08%, 陶瓷产率为99.68%, 材料的三点弯曲强度达到293MPa.
关键词:
陶瓷前驱体
,
active filler
,
linear shrinkage
,
ceramic yield
H.F.Hu
,
Z.H.Chen
,
and C.J.Zhou Department of Material Engineering & Applied Chemistry
,
National University of Defense Technology
,
Changsha 410073
,
China
金属学报(英文版)
The flexural strengths and oxidative resistant properties of the ceramics derived from polycarbosilane and active fillers (Ti, TiH 2, TiB 2, Cr, and CrSi 2) were measured and characterized. The introduction of active fillers enhances slightly the flexural strengths, and further densification is required to obtain higher strengths. The oxidative resistant behaviors of the specimens with active fillers are, by means of weight gain in air, poorer compared with those without active fillers.
关键词:
polycarbosilane
,
null
,
null
,
null
H.F.Hu
,
Z.H.Chen and C.J.Zhou Department of Material Engineering & Applied Chemistry
,
National University of Defense Technology
,
Changsha 410073
,
China
金属学报(英文版)
The pyrolytic process of polycarbosilane (PCS) with active fillers (Ti, TiH 2, TiB 2, Cr, CrSi 2) is investigated. The ceramic yields with active fillers reach over 100% in N 2 atmosphere, and no shrinkage occurs when 12vol% Ti, or 4vol% Cr, or 3vol% CrSi 2 is added into PCS. XRD patterns indicate that metal carbides and nitrides form by reacting with gaseous evolution and N 2.
关键词:
polycarbosilane
,
null
,
null
,
null
,
null
