葛启录
,
雷廷权
,
周玉
材料研究学报
本文通过XRD,SEM,TEM 以及三点弯曲试验技术研究了Al_2O_3-25 v.-%ZrO_2(2mol%Y_2O_3)-25v.-% SiCw(AZS)三元陶瓷复合材料的断裂特点和韧化机理。结果表明,该材料的载荷-位移曲线因晶须的反复阻止作用呈锯齿状,ZrO_2与SiC 晶须同时起增韧作用,材料的良好韧性是ZrO_2的相变增韧、微裂纹增韧和裂纹偏转与分枝增韧以及SiC 晶须的裂纹桥接与拔出效应共同作用的结果,但其综合效果不是简单叠加。本文还建立了ZrO_2-SiC_W 的复合韧化模型,并进行了讨论。
关键词:
ZrO_2增韧
,
SiC whisker
,
ceramic composite
,
toughening
ZHANG Jinsong XIA Fei LUO Chuan CAO Lihua ZHAO Kuanfang HU Wanping Institute of Metal Research
,
Academia Sinica
,
Shenyang
,
China ZHANG Jinsong Research Assistant
,
Institute of Metal Research
,
Academia Sinica
,
Shenyang 110015
,
China
金属学报(英文版)
A ZTA-SiC_W ceramic composite of room temperature strength 935—1110 MPa and frac- ture toughness 9.7MPa·m~(1/2) was prepared using the sol-gel proeess.Its microstructure and fracture feature have been examined by means of X-ray diffraction analysis and electron mi- croscope observations.The results show that the whiskers are well dispersed and the matrix has an obvious texture character.Between the whisker and matrix,there is a great number of transcrystalline and transcrystalline connective relation other than part of conventional polycrystalline connective ones.Certain secondary cracks closely related with local whisker group are found on the fracture surface.It may be a new reinforcing and toughening mecha- nism by whisker group,of which the whiskers in the local whisker group arrest synergetically the crack propagation accompaning with the formation of secondary cracks.
关键词:
ceramic composite
,
null
冉松林
,
汪德文
,
孙慧峰
,
樊传刚
人工晶体学报
往B4C中添加适量TiB2形成B4C-TiB2复相陶瓷既可以保留B4C的超硬、低密度等优良性能,又可通过提高陶瓷材料的致密度来改进材料的力学性能,还可降低材料的电阻率使其满足电火花加工的要求,因此B4C-TiB2复相陶瓷是最具有潜力的一类B4C基复合材料.本文从粉体制备、烧结致密化、显微结构、力学性能、电学及加工性能等方面就B4C-TiB2复相陶瓷的最新研究进展作了系统的阐述并对其发展方向做了展望.
关键词:
B4C
,
TiB2
,
复相陶瓷
,
机械性能
李鸽
,
王坚茹
,
陈智刚
,
李小军
,
裴均晔
兵器材料科学与工程
在14.5 mm制式弹弹头部采用非金属Tc材料，并与制式弹进行对比，在相同装药量的情况下，试验研究了两种弹丸对陶瓷复合靶的侵彻能力。采用ANSYS-LS/DYNA进行模拟仿真，并与试验结果对比，模拟结果与试验结果基本吻合，Tc复合弹侵彻装甲钢板形成冲塞，并在装甲钢背面有鼓包，鼓包周围有明显的裂纹。结果表明，Tc复合弹对陶瓷/钢复合靶的侵彻能力优于制式弹。
关键词:
弹丸
,
侵彻
,
陶瓷复合
,
数值模拟
