摘要
弓网系统中,各种类型的受电弓滑板承担着传输电能的重要功能,其严酷的工作条件对受电弓滑板材料的性能提出了非常苛刻的要求。目前最主要的受电弓滑板有:粉末冶金滑板,纯碳滑板和浸金属碳滑板。其中碳滑板材料性能较好但价格昂贵,粉末冶金滑板材料价格便宜,但性能明显逊于前者。Ti_3SiC_2/Ti C是一种兼具陶瓷与金属性质的新型材料,与碳滑板材料相比,其电阻率低,且具有良好的抗氧化性和自润滑减摩性,因此Ti_3SiC_2/TiC将可能成为一种工艺简单、成本更低、而性能则更高的新型受电弓滑板材料。以Si、Ti和C为原料,利用熔渗反应烧结技术制备出Ti_3SiC_2/TiC复合材料,研究结果表明,制备样品的弯曲强度与硬度分别达到423~564 MPa和169~249 HB。同时,对Ti_3SiC_2/TiC复合材料的断裂机理进行了研究。
The Ti_3SiC_2/Ti C composites with high density have been fabricated by infiltration sintering synthesis（ IS） with Si,Ti and C powders（ x Si∶ 3Ti∶ 2C） as the raw material. The crystal structure and composition of samples were determined respectively. The result showed that samples consists of double-phase： Ti C and Ti_3SiC_2.The Ti_3SiC_2/Ti C samples showed good mechanical performance-the flexural strength and the hardness were 423 ~564 MPa and 169 ~ 249 HB,respectively. The Brinell hardness of samples varies regularly as the content of titanium carbide in Ti_3SiC_2/Ti C composites and test loads change. The damage and fracture mechanisms were also studied in this paper.
出处
《科学技术与工程》
北大核心
2017年第25期274-278,共5页
Science Technology and Engineering
基金
National joint fund (UI034003)
Nanhu Scholars Program for Young Scholars of XYNU~~
关键词
Ti3SiC2/TiC
熔渗
力学性能
断裂机理
Ti3SiC2/TiC infiltration sintering mechanical properties fracture mechanisms
