(LaNbO4+ZrO2)/MoSi2复合陶瓷的显微组织及韧化机理
Microstructure and Toughening Mechanism of (LaNbO4+ZrO2)/MoSi2 Composite Ceramics
摘 要
利用热压法制备了(LaNbO4+ZrO2)/MoSi2复合陶瓷材料,通过扫描电镜、图像分析仪、X射线衍射仪分析了其显微组织、物相和断裂特征,测算了其显微硬度、晶粒尺寸、孔隙率和断裂韧度.结果表明：该复合材料与单相MoSi2相比,其晶粒明显细化,致密性很好,硬度值略有增大;LaNbO4、ZrO2颗粒的协同复合作用引起断裂机制由穿晶断裂为主向沿晶断裂为主转变,使复合材料的韧性显著提高,这主要与晶粒细化、致密性提高、ZrO2纳米颗粒的相变增韧、裂纹偏转、微裂纹区增韧以及LaNbO4应力激发的畴结构切换增韧机制有关.
ZrO2纳米颗粒
韧化
MoSi2基陶瓷
LaNbO4
ZrO2 nanoparticle
toughening
MoSi2 matrix ceramic
Abstract
(LaNbO4+ZrO2)/MoSi2 composite ceramics were prepared by hot-pressing sintering.The microstructure and fracture characteristics of composites were analyzed by means of scanning electron microscope,image analysis instrument and X ray diffractometer.The microhardness,grain size,porosity and fracture toughness were measured.The grain of (LaNbO4+ZrO2)/MoSi2 composite sample is obviously fine compared with that of MoSi2 sample.The compactness of composite is excellent with microhardness increased.LaNbO4 assist with ZrO2 particles caused the change from transgranular to intergranular fracture mechanism,which greatly improved the toughness of MoSi2.These might be related to the fine crystal grain,improved compactness,phase transfer toughening,crack deflect,microcrack toughening of ZrO2 nanoparticles and domain structure transfer of LaNbO4 particles.
中图分类号 TH145.1
所属栏目
基金项目 南昌航空工业学院科研基金资助项目(EC200501012);航空基础科学基金资助项目(04G56008)
收稿日期 2006/7/20
修改稿日期 2006/11/19
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备注刘长虹(1978-),女,江西吉安人,硕士,讲师.
引用该论文: LIU Chang-hong,AI Yun-long,WANG Ying. Microstructure and Toughening Mechanism of (LaNbO4+ZrO2)/MoSi2 Composite Ceramics[J]. Materials for mechancial engineering, 2007, 31(6): 46～49
刘长虹,艾云龙,王莹. (LaNbO4+ZrO2)/MoSi2复合陶瓷的显微组织及韧化机理[J]. 机械工程材料, 2007, 31(6): 46～49
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