Ti3SiC2材料的力学性能及抗损伤机制
Mechanical Properties and Damage Mechanism of Ti3SiC2 Ceramics
摘 要
利用反应烧结技术得到了纯度为93.0%的Ti3SiC2块体材料;测试了该材料的断裂强度和硬度;用XRD、SEM等方法分析了材料的物相组成、断口形貌和损伤机制;用TG/DTA法分析了气孔产生的原因.结果表明:1 250 ℃烧结Ti3SiC2材料的抗弯强度为105.59 MPa,硬度为101 HB;其强度随Ti3SiC2含量的增加而增大;材料的抗损伤机制是通过晶粒破碎、穿晶断裂、分层、拔出等形式来消耗能量,从而阻止了裂纹的扩展,表现出了一定的微塑性.
反应烧结
力学性能
抗损伤机制
Ti3SiC2
reaction sintering
mechanical property
damage tolerance mechanism
Abstract
Ti3SiC2 ceramics with purity of 93% were prepared by reaction sintering technology.The hardness and flexural strength of the sintered ceramics were tested.The phase compositions,fracture surfaces and damage mechanism were analyzed by X-ray diffraction (XRD) and scanning electron microscopy (SEM).The cause for porosity formation was analyzed by differential thermal analysis (DTA) and thermogravimetric analysis(TG).The results show that the hardness and flexural strength of the Ti3SiC2 ceramics were up to 101 HB and 105.59 MPa respectively and the flexural strength mainly increased with the mcrease of Ti3SiC2 content.Larger Ti3SiC2 grains were prone to breakage,transgranular fracture and delamination,but smaller grains were more easily pulled out.The damage in the contact region dissipated the energy so that Ti3SiC2 possessed quasi-plasticity.
中图分类号 TF12
所属栏目 材料性能及其应用
基金项目 陕西省自然科学基金资助项目(2007E104)
收稿日期 2007/12/21
修改稿日期 2008/6/30
网络出版日期
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备注王超(1981-),男,辽宁铁岭人,硕士研究生.
引用该论文: WANG Chao,Lv Zhen-lin,ZHANG Shan-shan,ZHOU Yong-xin. Mechanical Properties and Damage Mechanism of Ti3SiC2 Ceramics[J]. Materials for mechancial engineering, 2009, 33(1): 73～75
王超,吕振林,张姗姗,周永欣. Ti3SiC2材料的力学性能及抗损伤机制[J]. 机械工程材料, 2009, 33(1): 73～75
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参考文献
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