摘要
以氢化钛(TiH2)粉代替钛粉,与氮化铝(AlN)粉体混合,合成高纯的三元氮化物Ti2AlN陶瓷粉体。氢化钛与氮化铝按照摩尔比2∶1的配比,在混料机中混合12 h,然后放入流动氩气气氛保护的管式炉中高温处理。通过对在不同温度以及不同时间下进行热处理得到的产物进行物相分析,探究Ti2AlN的形成机理,发现在1400℃下保温2 h得到的Ti2AlN粉体纯度最高,约为96.2%(质量分数)。在同样条件下,以钛粉为钛源合成Ti2AlN粉体的纯度只有80.2%(质量分数)。因为氢化钛粉体价格低于钛粉,并且合成的样品纯度显著提高。所以,以氢化钛粉代替钛粉为钛源,合成Ti2AlN具有显著优势。同时研究了所合成Ti2AlN粉体在不同酸溶液(KF-HCl、NaF-HCl和NH4F-HCl)腐蚀行为。结果发现:将Ti2AlN(~2 g)浸入由2 g KF溶解在40 mL 6 M HCl的KF-HCl混合液中,在50℃下搅拌48 h得到碎片团簇型TiN。但是二维碳化物Ti2N MXene不能通过选择性刻蚀Ti2AlN的方法得到。
In this paper,instead of titanium powder,titanium hydride(TiH2)powders were mixed with aluminum nitride(AlN)powders to synthesize highly pure ternary nitride Ti2AlN powders.TiH2 and AlN powders were mixed for 12 h at a molar ratio of 2:1,and then placed in a tube furnace protected by a flowing argon atmosphere for high temperature treatment.The formation mechanism of Ti2AlN was investigated by phase analysis of the products obtained by heat treatment at different temperatures and different time.It was found that the Ti2AlN powders obtained at 1400℃for 2 h had the highest purity of about 96.2 wt.%.Under the same conditions,the Ti2AlN synthesized from Ti powders as Ti source had the purity of 80.2 wt.%.Thus TiH2 powders were better Ti sources than Ti powders to synthesize Ti2AlN,due to the lower cost and higher purity of synthesized samples.The corrosion behavior of the synthesized Ti2AlN powders in different acid solutions(KF-HCl,NaF-HCl and NH4F-HCl)was also studied.It was found that fragment cluster-type was obtained when Ti2 AlN(~2 g)was immersed in the KF-HCl mixture(obtained by dissolving 2 g KF in 40 mL of 6 M HCl)and stirred at 50°C for 48 h.However,two-dimensional Ti2 N MXene could not be obtained through selective etching method.
作者
郭奕彤
王军凯
胡前库
王李波
周爱国
GUO Yitong;WANG Junkai;HU Qianku;WANG Libo;ZHOU Aiguo(School of Materials Science and Engineering,Henan Polytechnic University,Jiaozuo 454003,China)
出处
《功能材料》
EI
CAS
CSCD
北大核心
2020年第5期5103-5110,共8页
Journal of Functional Materials
基金
国家自然科学基金资助项目(51772077)
河南省高校科技创新团队资助项目(19IRTSTHN027)
河南省自然科学基金资助项目(182300410228,182300410275)
河南理工大学博士基金资助项目(B2019-40)
省部共建耐火材料与冶金国家重点实验室开放基金资助项目(G201904)。
