摘要
研制出一种稀土补强Al2O3/(W，Ti)C新型陶瓷刀具材料，并对其增韧补强机制作了研究。表明：稀土元素的添加能以净化界面、提高界面结合强度以及纳米质点强化的作用机制显著提高Al2O3/(W，Ti)C陶瓷刀具材料的抗弯强度和断裂韧度。而且由于材料中强弱界面的共同存在，使得裂纹桥联、裂纹分支、裂纹偏转以及微裂纹等增韧机制得到明显增加和加强，从而以多种增韧机制及其相互作用共同提高稀土补强Al2O/(W，Ti)C陶瓷刀具材料的断裂韧度。
An advanced Al2O3/(W,Ti)C composite ceramic tool material reinforced by rare earth elements is developed,and the toughening and strengthening mechanisms are analyzed. Results show that it is the acting mechanisms of the added rare earth such as the purification of the interface,and then the increase of the interface bonding strength as well as the strengthening by nano-sized particles that result in the increase of the flexural strength and the fracture toughness of the ceramic tool material.Since the co-existing of both strong and weak interfaces,the toughening mechanisms like crack bridging,crack branching,crack defection and microcracking,etc. are noticeably increased and strengthened. Therefore,the fracture toughness of the Al2O3/(W,Ti)C ceramic tool material reinforced by rare earth is increased as a result of the interactions of several kinds of toughening mechanisms.
出处
《机械工程学报》
EI
CAS
CSCD
北大核心
2000年第11期50-53,58,共5页
Journal of Mechanical Engineering
基金
山东省科委资助!(1997 0205)
关键词
陶瓷刀具材料
力学性能
稀土增韧补强
Ceramic tool material
Rare earth element Mechanical property
Toughening Strengtheni
