界面反应产物对B_(4)C/Al复合材料颗粒润湿性及界面强度的影响机制  

Effect of interfacial reaction products on the wettability and interfacial strength of B_(4)C/Al composites

作　　者：郭文波 胡启耀 肖鹏 GUO Wenbo;HU Qiyao;XIAO Peng(School of Aeronautical Manufacturing Engineering,Nanchang Hangkong University,Nanchang 330063,China)

机构地区：[1]南昌航空大学航空制造工程学院,南昌330063

出　　处：《复合材料学报》2022年第6期2941-2948,共8页Acta Materiae Compositae Sinica

基　　金：江西省自然科学基金面上项目(20192BAB206003);博士科研启动基金项目(EA201803210)。

摘　　要：采用搅拌铸造法制备了B_(4)C/Al复合材料,利用实验分析结合第一性原理计算的方法,探讨了界面反应产物Al_(3)BC和TiB_(2)对B_(4)C/Al复合材料颗粒润湿性及界面结合强度的影响机制。结果表明,界面反应产物为Al_(3)BC时,B_(4)C颗粒润湿性没有得到实质性改善,存在明显的颗粒团聚现象,界面结合强度较低且过度的界面反应使B_(4)C颗粒分解损耗严重,导致B_(4)C颗粒增强效果不明显;而通过添加Ti元素使界面反应产物为TiB_(2)时,颗粒润湿性明显改善,B_(4)C颗粒团聚现象显著减少,界面结合强度较高,力学性能得到显著提高。这主要是由于不同终端的Al(111)/TiB_(2)(0001)界面黏附功均大于Al(111)/B_(4)C(0001)的界面黏附功,表明界面反应产物TiB_(2)可以提高B_(4)C颗粒的润湿性,而界面反应产物Al_(3)BC对提高B_(4)C颗粒的润湿性非常有限;Al(111)/Al_(3)BC(0001)和Al(111)/TiB_(2)(0001)的界面上均形成了混合的共价键/金属键;Al(111)/TiB_(2)(0001)的界面上的化学键作用力更大,相应地界面结合强度也更大。The B_(4)C/Al composites were prepared by stirring casting method.The method of experimental analysis combined with first-principles calculations was used to explore the influence mechanism of the interfacial reaction products Al_(3)BC and TiB_(2)on the wettability of B_(4)C/Al composite particles and the interfacial bonding strength.The results show that when the interface reaction product is Al_(3)BC,the wettability of B_(4)C particles has not been substantially improved,particle agglomeration still exists,and the interface bonding is poor.Excessive interface reaction makes the decomposition and loss of B_(4)C particles serious,resulting in insignificant strengthening effect of B_(4)C particles.When the interface reaction product is TiB_(2)by adding Ti element,the particle wettability is significantly improved,the agglomeration of B_(4)C particles is significantly reduced,the interface bonding strength is higher,and the mechanical properties are significantly improved.The Al(111)/TiB_(2)(0001)interface adhesion work of different terminals is greater than that of Al(111)/B_(4)C(0001),indicating that the interface reaction product TiB_(2)can improve the wettability of B_(4)C particles.The interface reaction product Al_(3)BC is very limited in improving the wettability of B_(4)C particles.A mixed covalent/metallic bond is formed on the interface of Al(111)/Al_(3)BC(0001)and Al(111)/TiB_(2)(0001).The chemical bonding strength on the Al(111)/TiB_(2)(0001)interface is greater,and the interface bonding strength is correspondingly greater.

关 键 词：B4C/Al复合材料 第一性原理 润湿性 力学性能 黏附功 偏态密度(PDOS) 

分 类 号：TB333[一般工业技术—材料科学与工程]