Kim Dong-Ki, Park Na-Ra, Kim Byung-Su, Yoon Jin-Kook, Hong Kyung-Tae, Shon In-Jin
J Nanosci Nanotechnol. 2016 Feb;16(2):1898-901. doi: 10.1166/jnn.2016.11946.
Ti and CNT powders were milled by high energy ball milling. The milled powders were then simultaneously synthesized and consolidated using pulsed current activated sintering (PCAS) within one minute under the applied pressure of 80 MPa. The advantage of this process is not only rapid densification to near theoretical density but also to prevent grain growth in nano-structured materials The milling did not induce any reaction between the constituent powders. Meanwhile, PCAS of the Ti-CNT mixture produced a Ti-TiC composite according to the reaction (Ti + 0.06CNT --> 0.94Ti+0.06TiC, Ti+0.12CNT --> 0.88Ti+0.12TiC). Highly dense nanocrystalline Ti-TiC compos- ites with a relative density of up to 99.5% were obtained within one minute. The hardness and fracture toughness of the dense Ti-6mole% TiC and Ti-12 mole% TiC produced by PCAS were also investigated.
钛粉和碳纳米管粉末通过高能球磨进行研磨。然后，在80兆帕的外加压力下，使用脉冲电流活化烧结（PCAS）在一分钟内对研磨后的粉末同时进行合成和固结。该工艺的优点不仅在于能快速致密化至接近理论密度，还能防止纳米结构材料中的晶粒生长。球磨并未引发组成粉末之间的任何反应。同时，根据反应（Ti + 0.06CNT --> 0.94Ti + 0.06TiC，Ti + 0.12CNT --> 0.88Ti + 0.12TiC），Ti-CNT混合物的PCAS产生了Ti-TiC复合材料。在一分钟内获得了相对密度高达99.5%的高密度纳米晶Ti-TiC复合材料。还研究了通过PCAS制备的含6摩尔% TiC和12摩尔% TiC的致密钛的硬度和断裂韧性。
