摘要
采用直流电弧氮等离子体蒸发─凝聚法制备了纯度大于９８％粒径可控的高纯ＴｉＮ纳米粉末。并通过原位加压，制得了纳米晶固体材料。探索了不同温度下ＴｉＮ纳米晶材料的晶粒尺寸和密度的变化规律。探讨了烧结过程中它的致密化过程。结果表明，温度较低时（＜１１００℃），晶粒长大不明显，密度提高不大。温度升高（＞１１００℃）．晶粒长大迅速，密度明显增大。同时，常温下ＴｉＮ纳米晶材料断面不平坦，有“类团聚体”存在，它对ＴｉＮ纳米晶材料的烧结致密化有重要影响。
Nanosize TiN powders were synthesized by the method of evaporation and condensation in DC arc nitrogen plasma. The purity of powders was more than 98%wt. The nanosize TiN powders were compacted in-situ at high pressure of 2.5GPa in high vacuum, into TiN nanostructured materials. The experimental results showed that the grains grow slowly and density is less than 74% at low temperature (<1100℃>.With temperature increases,the grains grow rapidly and density enlarged obviously. Meanwhile it was found that the fractograph of nanostructured TiN materials has an uneven surface with some ridges called “as-agglomerates”. This influenced the densification and micro structure of TiN nanostructured materials.
出处
《材料科学与工程》
CSCD
1994年第3期46-50,共5页
Materials Science and Engineering
基金
国家高技术"863"资助项目
关键词
纳米晶材料
等离子体
晶粒生长
nanostructured materials, Titanium Nitride(TiN), plasma, grain growth, densification
