Si_(3)N_(4)晶须断裂能计算及石墨烯/Si_(3)N_(4)晶须协同增韧Si_(3)N_(4)陶瓷摩擦学特性研究  

Calculation of Fracture Energy of SisN4 Whiskers and Tribological Properties of Si_(3)N_(4) Ceramics Toughened by Graphene/Si_(3)N_(4) Whiskers

作　　者：阎贝 陈飞 朱赞霏 闫柯[2] YAN Bei;CHEN Fei;ZHU Zanfei;YAN Ke(School of Mechanical Engineering,Chang'an University,Xi'an 710064,China;School of Mechanical Engineering,Xi'an Jiaotong University,Xi'an 710049,China)

机构地区：[1]长安大学工程机械学院,西安710064 [2]西安交通大学,机械工程学院,710049

出　　处：《中国陶瓷》2023年第11期26-33,共8页China Ceramics

基　　金：国家自然科学基金青年基金(52105242);中央高校基本科研项目(300102252103)。

摘　　要：针对制约基于有限元开展石墨烯/晶须协同增韧陶瓷材料研究的问题,以Si_(3)N_(4)晶须(β-Si_(3)N_(4w))为例,提出了求解β-Si_(3)N_(4w)断裂能的模型方法并基于分子动力学计算了β-Si_(3)N_(4w)断裂能,通过干摩擦磨损试验研究了石墨烯纳米片(MLG)/β-Si_(3)N_(4w)及载荷对Si_(3)N_(4)基陶瓷摩擦学特性的影响。结果表明:β-Si_(3)N_(4w)的断裂能约为0.35J/m^(2),仿真及实验结果具有较好的一致性,有效验证了断裂能结果的有效性。Si_(3)N_(4)基陶瓷在10N载荷时摩擦系数达到超低值0.042。MLG润滑膜及Si_(3)N_(4)基陶瓷韧性的提高是摩擦系数降低的主要原因。Aiming at the problems that restrict the research on graphene/whisker synergistic toughening ceramic materials based on finite element method,this paper takes Si_(3)N_(4) whisker(β-Si_(3)N_(4w))as an example and proposes a new method for Si_(3)N_(4w) fracture energy calculation and theβ-Si,N4w fracture energy is calculated based on molecular dynamics.By dry friction and wear experiments,the effect of Graphene nanoflakes(MLG)/β-Si_(3)N_(4w) and the loading on the tribological characteristics of Si,N4 based ceramics is studied.The results show that the fracture energy of β-Si_(3)N_(4w) is about 0.35 J/m^(2).The simulation and experimental results have good consistency,which effectively verifies the validity of the fracture energy results.The friction coefficient of Si,N4 based ceramics reaches an ultra-low value of 0.042 under 10N load.The increase of MLG lubricating film and Si_(3)N_(4) based ceramics toughness is the main reason for the decrease of friction coefficient.

关 键 词：石墨烯 晶须 断裂能 摩擦系数 

分 类 号：TQ174.75[化学工程—陶瓷工业]