摘要
Ｂ４Ｃ基体中掺加不同含量的Ａｌ２Ｏ３在１８５０℃，３５ＭＰａ压力下，热压烧结，利用ＸＲＤ、ＳＥＭ、ＥＤＡＸ、ＳＥＮＢ等方法对试样的组织结构及力学性能进行研究。结果表明：Ａｌ２Ｏ３掺加不仅降低了热压烧结温度，促进了烧结致密化，获得９６％以上的相对密度，而且提高了纯Ｂ４Ｃ材料的力学性能。Ｂ４Ｃ－２０％ｖｏｌＡｌ２Ｏ３的ＫＩＣ值达５．４３ＭＰａ·ｍ１／２，弯曲强度为３７０．４ＭＰａ；Ｂ４Ｃ－３０％ｖｏｌＡｌ２Ｏ３的ＫＩＣ值达５．７６ＭＰａ·ｍ１／２，弯曲强度为３８９．５ＭＰａ。分析认为；较高致密度是提高强度的主要原因，强韧化机制是颗粒细化、微裂纹及残余应力场共同作用的结果。
By volume 20%, 30vol% Al2O3 were added to B4C matrix respectively and sintered at1850℃ 35MPa. The microstructure and mechanical Properties of composites have been studied bymeans of different methods, such as XRD, SEM, EDAX and SENB. The results show that the fracturetoughness and fracture strength of B4C -20% Al2O3 are 5. 43 MPa m1/2 and 370. 4MPa respectively.The B4C - 30% Al2O3 are 5. 76 MPa m1/2 and 389. 5MPa respectively. We think that the main reasonto improve the fracture strength is the high densification. To the fracture toughness is the cooperation ofthe residual thermal stress toughening and the microcrack toughening et al.
出处
《哈尔滨建筑大学学报》
EI
1999年第5期74-78,共5页
Journal of Harbin University of Civil Engineering and Architecture
关键词
组织结构
复合材料
力学性能
陶瓷
韧化机制
B4C
Al2O3
microstructure
mechanical properties
toughening mechanisms
