Ni-Al辅助微波自蔓延烧结制备Ti_(3)SiC_(2)基金刚石复合材料工艺研究  

Ti_(3)SiC_(2)/diamond composites by Ni-Al assisted microwave self-propagating sintering

作　　者：史书浩 杨黎[1] 郭胜惠[1] 高冀芸 侯明[1] 鲁元佳 SHI Shuhao;YANG Li;GUO Shenghui;GAO Jiyun;HOU Ming;LU Yuanjia(School of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Chemistry and Environment,Yunnan Minzu University,Kunming 650093,China)

机构地区：[1]昆明理工大学冶金与能源工程学院,昆明650093 [2]云南民族大学化学与环境学院,昆明650093

出　　处：《金刚石与磨料磨具工程》2024年第1期22-30,共9页Diamond & Abrasives Engineering

基　　金：NSAF基金(U2030207);国家自然科学基金(51864028)。

摘　　要：为降低金刚石磨削工具的制造成本和能耗,探寻一种在低能耗下实现高性能陶瓷结合剂金刚石磨具的制备工艺,同时研究助燃剂Si和金刚石粒度等因素对样品物相组成、显微形貌和磨削性能的影响。采用Ti、Si、石墨粉和金刚石磨料作为原料,经冷压成型至生胚,通过Ni-Al辅助在微波场加热诱发Ti-Si-C体系发生自蔓延高温合成(SHS)反应以制备Ti_(3)SiC_(2)基金刚石复合材料。结果表明,高热值Ni-Al合金辅助可以缩短样品的烧结时间,还可以将诱发SHS反应的温度点控制在金刚石石墨化温度以下。在Ar保护气氛下,Ti-Si-C体系发生SHS反应,可生成Ti_(3)SiC_(2)、TiC和Ti5Si3等3种物相。随Si含量升高,Ti_(3)SiC_(2)相先增多后减少,当n(Ti):n(Si):n(C)=3∶1.1∶2时,复合材料的磨削性能最佳,磨耗比最高可达286.53。分析不同原料配比下的试样磨耗比差异的产生机制,认为基体组织中存在微小且分布均匀的气孔结构,在磨削时可产生大区域的平整磨削面,易于发挥金刚石磨料的磨削效果,有利于提升复合材料样品的磨削性能。Low carbon economy and the green economy represent the strategic direction of sustainable development.In order to reduce the manufacturing cost and energy consumption of diamond grinding tools,the preparation process of high-performance vitrified bond diamond abrasive tools,with low energy consumption was explored.The effects of the combustion promoter Si and diamond particle size on the phase composition,microstructure and grinding performance of the samples were studied.Ti_(3)SiC_(2)/diamond composites were prepared through self-propagating high-temperature synthesis(SHS)reaction of the Ti-Si-C system induced by microwave field heating with the assistance of Ni-Al.This involved using Ti,Si,graphite powder and diamond abrasive as raw materials.The results show that the high calorific value Ni-Al alloy can shorten the experimental time of sample sintering and control the temperature of the SHS reaction below the graphitization temperature of diamond.Ti_(3)SiC_(2),TiC and Ti5Si3 phases were formed by the SHS reaction of the Ti-Si-C system in an Ar atmosphere.With an increase in Si content,the Ti_(3)SiC_(2) phase increases first and then decreases.When the ratio of n(Ti)∶n(Si)∶n(C)is 3∶1.1∶2,the grinding performance of Ti_(3)SiC_(2)/diamond composites is optimal,and the grinding consumption ratio of the samples can reach 286.53.The mechanism behind the difference in the grinding consumption ratio of the samples under different raw material ratios was analyzed.It is considered that the small and evenly distributed pore structure in the matrix structure can produce a large area of a flat grinding surface during grinding.This is easy to exert the grinding effect of diamond abrasives and is conducive to improving the grinding performance of composite samples.

关 键 词：微波自蔓延烧结 Ti_(3)SiC_(2) 金刚石复合材料 NI-AL合金 

分 类 号：TG74[金属学及工艺—刀具与模具]