Spark plasma sintering of boron nitride micron tubes reinforced boron carbide ceramics with excellent mechanical property |
| |
Authors: | Weiping Xuan Yuchun Ji Bingsai Liu Shaofei Li Wenzhuo Chen Zhengdei Li Jilin Wang Guoyuan Zheng Fei Long |
| |
Affiliation: | 1. China School of Materials Science and Engineering, Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, China;2. China School of Materials Science and Engineering, Key Laboratory of New Processing Technology for Nonferrous Metals and Materials of Ministry of Education, Guilin University of Technology, Guilin, China
Guangxi Key Laboratory of Optical and Electronic Materials and Devices, Guilin University of Technology, Guilin, China |
| |
Abstract: | In this paper, the novel boron nitride micron tubes (BNMTs) were used to reinforce commercial boron carbide (B4C) ceramics prepared via spark plasma sintering technology. The effects of the sintering parameters, sintering temperature, the holding time, and the BNMTs content on the microstructure and mechanical properties of B4C/BNMTs composite ceramics were studied. The results indicated that adding a proper amount of BNMTs could inhibit the grain growth of B4C and improve the fracture toughness of the B4C/BNMTs composite ceramics. The prepared composite ceramic sample with 5 wt% BNMTs at 1850°C, 8 min and 30 MPa displayed the best mechanical properties. The relative density, hardness, fracture toughness, and bending strength of the samples were 99.7% ± .1%, 35.62 ± .43 GPa, 6.23 ± .2 MPa m1/2, and 517 ± 7.8 MPa, respectively. Therein, the corresponding value of hardness, fracture toughness, and bending strength was increased by 10.3%, 43.59%, and 61.5%, respectively, than that of the B4C/BNMTs composite ceramic without BNMTs. It was proved that the high interface binding energy and bridging effect between boron carbide and BNMTs were the toughening principle of BNMTs. |
| |
Keywords: | boron carbide boron nitride micron tubes composite ceramics mechanical property spark plasma sintering |
|
|