摘要
采用3Ti/Si/2C单质粉末为结合剂原料,添加适量的金刚石,通过放电等离子烧结诱发自蔓延反应快速制备Ti_3SiC_2-金刚石复合材料。研究保温时间对复合材料的基体构成和显微形貌的影响。结果表明:3Ti-Si-2C试样经SPS加热,在1170℃左右发生自蔓延反应,形成Ti_3SiC_2相;产物的主要生成相为Ti_3SiC_2、Ti5Si3和TiC;在1500℃得到的试样中,Ti_3SiC_2含量较高,原料反应较充分;在1500℃烧结含金刚石质量分数10%的粉末,得到的试样主相为Ti_3SiC_2与TiC,同时含有少量的Si、SiC与金刚石;保温1min后得到的试样中Ti_3SiC_2含量较高,Ti_3SiC_2相发育成板条状晶粒,与金刚石结合良好;保温5min后得到的试样中Ti_3SiC_2含量较低,基体主要由大量的TiC颗粒组成,同时金刚石发生严重石墨化,与基体间形成了较厚的过渡层。
Ti3SiC2-diamond composites were fabricated by spark plasma sintering induced selfpropagation reaction with 3Ti/Si/2C powders as bonder.The effect of holding time on the phase composition and microstructure of composites were studied.The result shows that Ti3SiC2 phase is formed when heated at 1170 ℃,whose main phases are Ti3SiC2,Ti5Si3 and TiC.It is also found that Ti3SiC2 content in the sample obtained at 1500 ℃is higher with fully reacted raw materials.The main phase of the sample containing 10wt% diamond is Ti3SiC2 and TiC.Additionally,small amounts of Si,SiC and diamond are also obtained.Ti3SiC2 content in the sample with holding time of 1min is higher,whose grains is lathe-structured and bonds well with diamond.Ti3SiC2 content in the sample with holding time of 5 min is lower,mainly composed of many TiC particles.In addition,the diamond is seriously graphitized,forming thick transition layer.
出处
《金刚石与磨料磨具工程》
CAS
2017年第1期43-46,共4页
Diamond & Abrasives Engineering
基金
河南省高等学校重点科研项目(17A430034)
河南省高校创新团队项目(15IRTSTHN004)
河南省省院科技合作项目(142106000193)
河南省教育厅自然科学研究计划项目资助(14A430007)
河南省科技开放合作项目(142106000051)
郑州市国际科技合作与交流项目(153PGJHZ209)
郑州市人才引育项目(141PRCYY514)
关键词
复合物构成和结构
显微形貌
石墨化
过渡层
composition and structure of composites
micro topography
graphitize
transition layer
