摘要
采用燃烧合成技术,通过改变Ti、Al和C3种粉末的比例制备出高纯度的Ti3AlC2块体材料,并对其在氩气中的高温热稳定性进行了研究。X射线衍射(XRD)表明合成产物除了含有Ti3AlC2外,还含有少量TiC和Ti-Al金属间化合物,经k值法计算得Ti3AlC2最高含量为96.7%。耦合等离子-原子发射光谱(ICP-AES)结果表明最高纯度的合成产物中Ti、Al质量分数分别为74.2%和13.7%,与Ti3AlC2中Ti和Al含量十分接近。利用SEM对燃烧产物断口进行了观察,发现明显的层片状结构。热重-差热(TG-DTA)结果表明燃烧合成的高纯Ti3AlC2在加热过程中没有明显的热效应,说明合成的产物处于近似平衡状态。Ti3AlC2的分解温度在1370℃左右,同时由于氧化作用而导致试样质量略有增加。
Highly pure Ti3AlC2 was synthesized by self-propagating high-temperature synthesis method from Ti, Al and C powders with different initial ratios. The thermal stability of Ti3AlC2 in Ar atmosphere was studied. X-ray diffraction results show the products consists of TiC and/or Ti-Al intermetallics besides Ti3AlC2. The maximum content of TiaAIC2 is estimated to be 96.7% by k-value method. The inductively coupled plasma-atomic emission spectrometry（ICP-AES） result shows that the highest-purity product contains 74.2% Ti and 13.7% A1, which is very close to those in Ti3AlC2. The fracture surfaces were observed by scanning electron microscope, where layered morphology is apparent. Thermal gravimetric-differential thermal analysis result shows no obvious heat effect was observed during heating highly pure as-synthesized Ti3AlC2, which indicates the as-synthesized product is almost in its equilibrium condition. The decomposition temperature of Ti3AlC2 is determined to be 1370 ℃ and the mass increased slightly because of oxidation.
出处
《稀有金属材料与工程》
SCIE
EI
CAS
CSCD
北大核心
2009年第A02期86-89,共4页
Rare Metal Materials and Engineering
基金
哈尔滨师范大学国家预研基金项目
黑龙江自然科学基金资助项目(E2007-09)
